Three-spined stickleback: Difference between revisions
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{{Short description|Species of fish}} |
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{{Taxobox |
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{{Speciesbox |
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| color = pink |
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| fossil_range = Middle [[Miocene]] to present, {{fossil range|13.0|0}} |
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| name = Three-spined stickleback |
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| image = Gasterosteus aculeatus.jpg |
| image = Gasterosteus aculeatus.jpg |
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| image_upright = 1.1 |
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| status = LC |
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| status_system = IUCN3.1 |
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| phylum = [[Chordate|Chordata]] |
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| status_ref = <ref name=iucn>{{cite iucn |author=NatureServe. |year=2019 |title=Gasterosteus aculeatus |page=e.T8951A58295405 |doi=10.2305/IUCN.UK.2019-2.RLTS.T8951A58295405.en |access-date=28 November 2022}}</ref> |
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| classis = [[Actinopterygii]] |
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| genus = Gasterosteus |
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| ordo = [[Gasterosteiformes]] |
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| species = aculeatus |
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| familia = [[Gasterosteidae]] |
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| authority = [[Carl Linnaeus|Linnaeus]], [[10th edition of Systema Naturae|1758]] |
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| genus = ''[[Gasterosteus]]'' |
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| synonyms = {{Specieslist |hidden=yes |
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| species = '''''G. aculeatus''''' |
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| Gasterosteus aculeatus aculeatus | Linnaeus, 1758 |
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| Leiurus aculeatus | (Linnaeus, 1758) |
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| Gasterosteus bispinosus | [[Johann Julius Walbaum|Walbaum]], 1792 |
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| Gasterosteus teraculeatus | [[Bernard Germain de Lacépède|Lacépède]], 1801 |
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| Gasteracanthus cataphractus | [[Peter Simon Pallas|Pallas]], 1814 |
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| Gasterosteus cataphractus | (Pallas, 1814) |
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| Gasterosteus biaculeatus | [[Samuel L. Mitchill|Mitchill]], 1815 |
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| Gasterosteus gymnurus | [[Georges Cuvier|Cuvier]], 1829 |
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| Gasterosteus aculeatus gymnurus | Cuvier, 1829 |
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| Gasterosteus semiarmatus | Cuvier, 1829 |
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| Gasterosteus niger | Cuvier, 1829 |
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| Gasterosteus trachurus | Cuvier, 1829 |
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| Gasterosteus aculeatus trachurus | Cuvier, 1829 |
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| Gasterosteus leiurus | Cuvier, 1829 |
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| Gasterosteus aculeatus leiurus | Cuvier, 1829 |
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| Gasterosteus semiloricatus | Cuvier, 1829 |
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| Gasterosteus argyropomus | Cuvier, 1829 |
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| Gasterosteus tetracanthus | Cuvier, 1829 |
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| Gasterosteus brachycentrus | Cuvier, 1829 |
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| Gasterosteus noveboracensis | Cuvier, 1829 |
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| Gasterosteus obolarius | Cuvier, 1829r |
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| Gasterosteus spinulosus | [[William Yarrell|Yarrell]], 1835 |
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| Gasterosteus dimidiatus | [[Johan Reinhardt|Reinhardt]], 1837 |
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| Gasterosteus loricatus | Reinhardt, 1837 |
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| Gasterosteus biarmatus | [[Jan A. Krynicki|Krynicki]], 1840 |
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| Gasterosteus ponticus | [[Alexander von Nordmann|Nordmann]], 1840 |
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| Gasterosteus neoboracensis | [[James Ellsworth De Kay|DeKay]], 1842 |
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| Gasterosteus nemausensis | [[Jean Crespon|Crespon]], 1844 |
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| Gasterosteus quadrispinosa | Crespon, 1844 |
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| Gasterosteus cuvieri | [[Charles Frédéric Girard|Girard]], 1850 |
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| Gasterosteus williamsoni | Girard, 1854 |
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| Gasterosteus aculeatus williamsoni | Girard, 1854 |
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| Gasterosteus inopinatus | Girard, 1854 |
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| Gasterosteus plebeius | Girard, 1854 |
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| Gasterosteus serratus | [[William Orville Ayres|Ayres]], 1855 |
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| Gasterosteus insculptus | [[John Richardson (naturalist)|Richardson]], 1855 |
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| Gasterosteus intermedius | Girard, 1856 |
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| Gasterosteus pugetti | Girard, 1856 |
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| Gasterosteus neustrianus | [[Émile Blanchard|Blanchard]], 1866 |
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| Gasterosteus argentatissimus | Blanchard, 1866 |
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| Gasterosteus elegans | Blanchard, 1866 |
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| Gasterosteus bailloni | Blanchard, 1866 |
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| Gasterosteus texanus | [[Henri Émile Sauvage|Sauvage]], 1874 |
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| Gasterosteus algeriensis | Sauvage, 1874 |
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| Gasterosteus aculeatus algeriensis | Sauvage, 1874 |
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| Gasterosteus suppositus | Sauvage, 1874 |
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| Gasterosteus atkinsii | [[Tarleton Hoffman Bean|Bean]], 1879 |
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| Gastrosteus hologymnus | [[Charles Tate Regan|Regan]], 1909 |
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| Gasterosteus hologymnus | Regan, 1909 |
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| Gasterosteus santaeannae | Regan, 1909 |
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| Gasterosteus aculeatus santaeannae | Regan, 1909 |
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| Gasterosteus aculeatus messinicus | [[Alexander I. Stephanidis|Stephanidis]], 1971 |
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}} |
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| synonyms_ref = <ref name = Fishbase>{{FishBase|Gasterosteus|aculeatus|month=June|year=2022}}</ref> |
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| range_map = [[File:Distribution of Gasterosteus aculeatus.png|250px|none|''Gasterosteus aculeatus'']] |
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| range_map_caption = Distribution of ''Gasterosteus aculeatus'', with observations (dots; based on <ref name="Fang 2018">{{cite journal |last1=Fang |first1=Bohao |last2=Merilä |first2=Juha |last3=Ribeiro |first3=Filipe |last4=Alexandre |first4=Carlos M. |last5=Momigliano |first5=Paolo |title=Worldwide phylogeny of three-spined sticklebacks |journal=Molecular Phylogenetics and Evolution |date=2018 |volume=127 |pages=613–625 |doi=10.1016/j.ympev.2018.06.008|pmid=29906607 |s2cid=49231567 |doi-access=free }}</ref>) and distribution (shaded area; based on https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=702) |
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}} |
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The '''three-spined stickleback''' ('''''Gasterosteus aculeatus''''') is a [[fish]] native to most inland and coastal waters north of 30°N. It has long been a subject of scientific study for many reasons. It shows great morphological variation throughout its range, ideal for questions about [[evolution]] and [[population genetics]]. Many populations are [[anadromous]] (they live in seawater but breed in fresh or brackish water) and very tolerant of changes in salinity, a subject of interest to physiologists. It displays elaborate breeding behavior (defending a territory, building a nest, taking care of the eggs and fry) and it can be social (living in shoals outside the [[breeding season]]) making it a popular subject of inquiry in fish [[ethology]] and [[behavioral ecology]]. Its antipredator adaptations, host-parasite interactions, sensory physiology, reproductive physiology, and [[endocrinology]] have also been much studied. Facilitating these studies is the fact that the three-spined stickleback is easy to find in nature and easy to keep in aquaria.<ref name="Barber 2013">{{cite journal |last1=Barber |first1=Iain |title=Sticklebacks as model hosts in ecological and evolutionary parasitology |journal=Trends in Parasitology |date=2013 |volume=29 |issue=11 |pages=556–566 |doi=10.1016/j.pt.2013.09.004|pmid=24145060 }}</ref> |
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The '''three-spined stickleback''', ''Gasterosteus aculeatus'', is native to much of northern [[Europe]], northern [[Asia]] and [[North America]]. It has been introduced into parts of southern and central Europe. |
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== Evolution == |
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Three [[subspecies]] are currently recognised. |
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The three-spined stickleback appears to be a rather old species that has remained morphologically unchanged for more than 10 million years. The oldest record of the species is from the Alta Mira Shale of the [[Monterey Formation]] of California, which preserves an articulated skeleton that appears essentially identical to the modern ''G. aculeatus'' complex. A slightly younger specimen is known from [[diatomite]] deposits from [[Lompoc, California|Lompoc]] that also belong to the Monterey Formation. Both specimens are known from marine deposits, suggesting a marine or anadramous lifestyle. The presence of the three-spined stickleback in the Miocene suggests that the three-spined stickleback complex must have diverged from the [[blackspotted stickleback]] prior to this point.<ref>{{Cite journal |last=Bell |first=Michael A. |last2=Stewart |first2=J. D. |last3=Park |first3=Peter J. |date=2009-06-12 |title=The World's Oldest Fossil Threespine Stickleback Fish |url=https://meridian.allenpress.com/copeia/article-abstract/2009/2/256/115060/The-World-s-Oldest-Fossil-Threespine-Stickleback |journal=Copeia |volume=2009 |issue=2 |pages=256–265 |doi=10.1643/CG-08-059 |issn=0045-8511}}</ref><ref>{{Cite journal |last=Bell |first=Michael A. |date=1977 |title=A Late Miocene Marine Threespine Stickleback, Gasterosteus aculeatus aculeatus, and Its Zoogeographic and Evolutionary Significance |url=https://www.jstor.org/stable/1443909 |journal=Copeia |volume=1977 |issue=2 |pages=277–282 |doi=10.2307/1443909 |issn=0045-8511}}</ref> |
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*''Gasterosteus aculeatus aculeatus'' is found in most of the species range, and is the subspecies most strictly termed the three-spined stickleback; its common name in [[England]] is the '''tiddler''', although "tittlebat" is also sometimes used. |
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*''G. a. williamsoni'', the '''unarmored threespine stickleback''', is found only in North America; its recognised range is southern [[California]], though there are isolated reports of it occurring in [[British Columbia]] and [[Mexico]]; |
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==Description== |
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[[File:Gasterosteus aculeatus aculeatus.jpg|thumb|left]] |
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This species can occasionally reach lengths of {{convert|8|cm|in|abbr=on}}, but lengths of {{convert|3-4|cm|in}} at maturity are more common. The body is laterally compressed. The base of the tail is slender. The caudal fin has 12 rays. The dorsal fin has 10–14 rays; in front of it are the three spines that give the fish its name (though some individuals may have only two or four). The third spine (the one closest to the dorsal fin) is much shorter than the other two. The back of each spine is joined to the body by a thin membrane. The anal fin has eight to 11 rays and is preceded by a short spine. The pelvic fins consist of just a spine and one ray. All spines can be locked in an erect position, making the fish extremely hard to swallow by a predator. The pectoral fins are large, with 10 rays. The body bears no scales, but is protected by [[bony plate]]s on the back, flanks, and belly. Only one ventral plate is present, but the number of flank plates varies greatly across the distribution range and across habitat types (see below); it is normally higher in marine populations (some freshwater populations may in fact lack lateral plates altogether).<ref name = Fishbase/> |
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Dorsal coloration varies, but tends towards a drab olive or a silvery green, sometimes with brown mottling. The flanks and belly are silvery. In males during the breeding season, the eyes become blue and the lower head, throat, and anterior belly turn bright red. The throat and belly of breeding females can turn slightly pink. A few populations, however, have breeding males which are all black<ref>{{cite journal|author=Reimchen, T.E.|year= 1989|title=Loss of nuptial colour in three-spined sticklebacks (''Gasterosteus aculeatus'')|journal=Evolution|volume=43|issue= 2|pages= 450–460|doi=10.2307/2409219|pmid= 28568546|jstor= 2409219}}</ref> or all white.<ref>{{Cite journal | doi = 10.1016/0305-1978(90)90129-4| title = Allozyme variation and the recognition of the "white stickleback"| journal = Biochemical Systematics and Ecology| volume = 18| issue = 7–8| pages = 559–563| year = 1990| last1 = Haglund | first1 = T. R. | last2 = Buth | first2 = D. G. | last3 = Blouw | first3 = D. M. }}</ref> |
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[[File:Three-Spined Stickleback.jpg|thumb|Male (reddish) and a [[Gravidity_and_parity#Gravidity_in_biology|gravid]] female three-spined stickleback]] |
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==Habitat and distribution== |
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The three-spined stickleback is found only in the Northern Hemisphere, where it usually inhabits coastal waters or freshwater bodies. It can live in either fresh, brackish, or salt water. It prefers slow-flowing water with areas of emerging vegetation. It can be found in ditches, ponds, lakes, backwaters, quiet rivers, sheltered bays, marshes, and harbours. |
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In North America, it ranges along the East Coast from Chesapeake Bay to the southern half of Baffin Island and the western shore of Hudson Bay, and along the West Coast from southern California to the western shore of Alaska and the Aleutian Islands. It can be found throughout Europe between 35 and 70°N. In Asia, the distribution stretches from Japan and the Korean peninsula to the Bering Straits. |
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Its distribution could be said to be circumpolar were it not for the fact that it is absent from the north coast of Siberia, the north coast of Alaska, and the Arctic islands of Canada. |
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==Variation in morphology and distribution== |
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[[File:Gasterosteus aculeatus 1879.jpg|thumb|left]] |
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[[File:Threespine stickleback head.webm|thumb|left|The head of a threespine stickleback reconstructed into a 3D mesh from a microCT scan. This individual was from a freshwater stream population on Vancouver Island, BC. Many stickleback traits can vary a great deal between freshwater populations, including the number of bony lateral plates, a few of which can be seen towards the posterior edge of this mesh, and the number and length of gill rakers and pharyngeal teeth, which can be seen inside the mouth.]] |
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Three [[subspecies]] are currently recognized by the [[IUCN]]: |
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*''G. a. aculeatus'' is found in most of the species range, and is the subspecies most strictly termed the three-spined stickleback; its common name in [[United Kingdom|Britain]] is the '''tiddler''', although "tittlebat" is also sometimes used. |
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*''G. a. williamsoni'', the '''unarmored threespine stickleback''', is found only in North America; its recognised range is southern [[California]], though isolated reports have been made of it occurring in [[British Columbia]] and [[Mexico]]; |
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*''G. a. santaeannae'', the '''Santa Ana stickleback''', is also restricted to North America. |
*''G. a. santaeannae'', the '''Santa Ana stickleback''', is also restricted to North America. |
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These subspecies actually represent three examples from the enormous range of morphological variation present within three-spined sticklebacks. Hybrids between some of these [[morph (zoology)|morph]]s show [[foraging]] disadvantages, a form of [[reinforcement (speciation)|reinforcement in the course of speciation]]. This is [[evidence for speciation by reinforcement]].<ref name="Noor-1999">{{cite journal | year=1999 | issue=5 | volume=83 | doi-access=free | publisher=[[The Genetics Society]] ([[Nature Portfolio|Nature]]) | pages=503–508 | journal=[[Heredity (journal)|Heredity]] | issn=0018-067X | last1=Noor | first1=Mohamed A. F. | title=Reinforcement and other consequences of sympatry | doi=10.1038/sj.hdy.6886320| pmid=10620021 | author1-link=Mohamed Noor | id=([[ORCID]]: [http://orcid.org/0000-0002-5400-4408 0000-0002-5400-4408]. [[Google Scholar|GS]]: [http://scholar.google.com/citations?user=5nkhrpUAAAAJ 5nkhrpUAAAAJ])}}</ref> |
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The three-spined stickleback reaches a maximum length of 11 cm. Many populations take 2 years to mature and experience only one breeding season before dying and some can take up to 3 years to reach maturity. However, some freshwater populations and populations at extreme latitudes can reach maturity in only 1 year. Although most specimens do have three spines on their backs, some have two or four; populations have also been identified in northern Scotland which are genetically 3-spined but actually lack spines. Three-spined sticklebacks can live in fresh, brackish or salt water. Fresh water varieties chiefly live in shallow inland ponds and streams but have also been found in the Great Lakes. They feed on worms, [[crustacea]]ns, the [[larvae]] and adult forms of aquatic [[insect]]s and drowned aerial insects, and small fish fry. They are in turn preyed on by larger fish, by fish-eating birds such as [[kingfisher]]s and aquatic insects such as the [[dragonfly]] although their spines and the bony plates on their bodies serve as protection against many predators. |
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Overall these morphs fall into two rough categories, the [[fish migration|anadromous]] and the [[freshwater]] forms: |
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In spring, males defend [[territory (animal)|territories]] where they build nests on the bottom of the pond or other body of water; the sequence of territorial, courtship and mating behaviours was described in detail by [[Niko Tinbergen]] in a landmark early study in [[ethology]]. Territorial males develop a red chin and belly colouration, and Tinbergen showed that the red colour acted as a simple [[sign stimulus]], releasing aggression in other males and the first steps in the courtship sequence from gravid females. Red colouration is produced from carotenoids found in the diet of the fish. As carotenoids cannot be synthesised de novo, the degree of colouration gives an indication of male quality, with higher quality males showing more intense colouration. Males also develop blue irises on maturation. Only the males care for the eggs once they are fertilised. Parental care is intense, involving nest maintenance and fanning of the eggs to ensure a fresh water supply. Males build the nests from vegetation, sand, pebbles and other debris, adhering the nest together with spiggin, a proteinaceous glue-like substance secreted from the kidneys. |
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The anadromous form spends most of its adult life eating [[plankton]] and [[fish]] in the sea, and returns to freshwater to breed. The adult fish are typically between 6 and 10 cm long, and have 30 to 40 lateral armour plates along their sides. They also have long [[fish anatomy|dorsal]] and [[fish anatomy|pelvic]] spines. The anadromous form is morphologically similar all around the [[Northern Hemisphere]], such that anadromous fish from the Baltic, the Atlantic and the Pacific all resemble each other quite closely. |
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Sticklebacks are easily maintained in the [[aquarium]], and are not currently considered to be [[endangered]]. They are popular subjects for laboratory research. |
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Three-spined stickleback populations are also found in freshwater lakes and streams. These populations were probably formed when anadromous fish started spending their entire lifecycle in fresh water, and thus [[evolution|evolved]] to live there all year round. Freshwater populations are extremely morphologically diverse, to the extent that many observers (and some taxonomists) would describe a new subspecies of three-spined stickleback in almost every [[lake]] in the Northern Hemisphere. One consistent difference between freshwater populations and their anadromous ancestors is the amount of body armour, as the majority of freshwater fish only have between none and 12 lateral armor plates, and shorter dorsal and pelvic spines. However, also large morphological differences occur between lakes. One major axis of [[:wikt:variation|variation]] is between populations found in deep, steep-sided lakes and those in small, shallow lakes. The fish in the deep lakes typically feed in the surface waters on plankton, and often have large eyes, with short, slim bodies and upturned jaws. Some researchers refer to this as the [[limnetic zone|limnetic]] form. Fish from shallow lakes feed mainly on the lake bed, and are often long and heavy bodied with relatively horizontal jaws and small eyes. These populations are referred to as the [[benthic zone|benthic]] form. |
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The three-spined stickleback was featured on a 14-franc [[postage stamp]] issued by [[Belgium]] in [[1990]]. |
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Since each [[drainage basin|watershed]] was probably colonised separately by anadromous sticklebacks, morphologically similar populations in different watersheds or on different continents are widely believed to have evolved independently. A unique population is found in the [[meromictic]] [[Pink Lake (Canada)|Pink Lake]] in [[Gatineau Park]], [[Quebec]]. Populations have been observed rapidly adapting to different conditions, such as in [[Lake Union]], where sticklebacks have lost and regained armor plates in response to pollution from human activity around the watershed.<ref>{{Cite web |date=2009-02-15 |title=Darwin's fishes: the threespine stickleback of the Pacific Northwest |url=https://www.seattletimes.com/seattle-news/darwins-fishes-the-threespine-stickleback-of-the-pacific-northwest/ |access-date=2022-06-11 |website=The Seattle Times |language=en-US}}</ref><ref>{{Cite web |date=2008-05-15 |title=Backward-evolving Lake Washington fish lends clues about genetics |url=https://www.seattletimes.com/seattle-news/backward-evolving-lake-washington-fish-lends-clues-about-genetics/ |access-date=2022-06-11 |website=The Seattle Times |language=en-US}}</ref><ref>{{Cite journal |last=Kitano |first=J |date=May 15, 2008 |title=Reverse Evolution of Armor Plates in the Threespine Stickleback |url=http://research.fhcrc.org/content/dam/stripe/peichel/other/big/2008KitanoCurrBiol.pdf |url-status=live |archive-url=https://web.archive.org/web/20170812131756/http://research.fhcrc.org/content/dam/stripe/peichel/other/big/2008KitanoCurrBiol.pdf |archive-date=August 12, 2017 |access-date=June 11, 2022 |journal=Current Biology|volume=18 |issue=10 |pages=769–774 |doi=10.1016/j.cub.2008.04.027 |pmid=18485710 |s2cid=7864384 }}</ref><ref>{{Cite web |title=The Burke Museum and others celebrate Charles Darwin on the occasion of his 200th |url=https://www.washington.edu/news/2009/02/12/the-burke-museum-and-others-celebrate-charles-darwin-on-the-occasion-of-his-200th/ |access-date=2022-06-11 |website=UW News |language=en}}</ref> |
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It is also referred to in the very beginning of Dickens' "Pickwick Papers", in the title of Mr. Pickwicks illustrous work — "Speculations on the Source of the Hampstead Ponds, with some Observations on the Theory of Tittlebats". |
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One aspect of this morphological variation is that a number of lakes contain both a limnetic and a benthic type, and these do not interbreed with each other. Evolutionary biologists often define [[species]] as populations that do not interbreed with each other (the [[Species#Definition|biological species concept]]), thus the benthics and limnetics within each lake would constitute separate species. These species pairs are an excellent example of how adaptation to different environments (in this case feeding in the surface waters or on the lake bed) can generate new species. This process has come to be termed [[ecological speciation]]. This type of species pair is found in [[British Columbia]]. The lakes themselves only contain three-spined sticklebacks and [[cutthroat trout]], and all are on islands. Tragically, the pair in Hadley Lake on [[Lasqueti Island]] was destroyed in the mid-1980s by the introduction of a predatory catfish, and the pair in Enos Lake on [[Vancouver Island]] has started to interbreed and are no longer two distinct species.<ref>{{Cite journal | doi = 10.1086/648559| pmid = 19916869| title = Breakdown in Postmating Isolation and the Collapse of a Species Pair through Hybridization| journal = The American Naturalist| volume = 175| issue = 1| pages = 11–26| year = 2010| last1 = Behm | first1 = J. E. | last2 = Ives | first2 = A. R. | last3 = Boughman | first3 = J. W. | s2cid = 15817509}}</ref> The two remaining pairs are on [[Texada Island]], in Paxton Lake and Priest Lake, and they are listed as Endangered in the Canadian Species at Risk Act.<ref>[http://www.dfo-mpo.gc.ca/species-especes/home_e.asp Canada – Species At Risk Act]. dfo-mpo.gc.ca</ref> |
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==References== |
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* {{FishBase species | genus = Gasterosteus | species = aculeatus | month = February | year = 2006}} |
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Other species pairs which consist of a well-armored marine form and a smaller, unarmored freshwater form are being studied in ponds and lakes in south-central Alaska that were once marine habitats such as those uplifted during the [[1964 Alaska earthquake]]. The evolutionary dynamics of these species pairs are providing a model for the processes of speciation which has taken place in less than 20 years in at least one lake. In 1982, a chemical eradication program intended to make room for trout and salmon at Loberg Lake, Alaska, killed the resident freshwater populations of sticklebacks. Oceanic sticklebacks introduced through nearby Cook Inlet recolonized the lake. In just 12 years beginning in 1990, the frequency of the oceanic form dropped steadily, from 100% to 11%, while a variety with fewer plates increased to 75% of the population, with various intermediate forms making up another small fraction.<ref name="Carroll">{{cite book | last = Carroll | first = Sean B. | author-link = Sean B. Carroll | title = The Making of the Fittest: DNA and the Ultimate Forensic Record of Evolution | publisher = W.W. Norton & Co. | year = 2006 | pages = 56–57 | isbn = 978-0-393-06163-5 }}</ref> This rapid evolution is thought to be possible through genetic variations that confer competitive advantages for survival in fresh water when conditions shift rapidly from salt to fresh water. However, the actual molecular basis of this evolution still remains unknown. |
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* {{ITIS|ID=166365|taxon=Gasterosteus aculeatus|year=2006|date=19 March}} |
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Although sticklebacks are found in many locations around the coasts of the Northern Hemisphere and are thus viewed by the IUCN as species of [[least-concern species|least concern]], the unique evolutionary history encapsulated in many freshwater populations indicates further legal protection may be warranted.<ref name=iucn/> |
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==Diet== |
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In its different forms or stages of life, the three-spined stickleback can be a bottom-feeder (most commonly chironomid larvae and amphipods)<ref>{{cite web | url=https://animaldiversity.org/accounts/Gasterosteus_aculeatus/ | title=Gasterosteus aculeatus | website=[[Animal Diversity Web]] }}</ref> or a planktonic feeder in lakes or in the ocean; it can also consume terrestrial prey fallen to the surface.<ref>{{cite journal|author=Sánchez-Hernández, J.|year=2012|title= Aplicación del análisis de los rasgos biológicos ("traits") de las presas para el estudio del comportamiento alimentario en peces bentófagos: el ejemplo del espinoso (''Gasterosteus gymnurus'' Cuvier 1829)|journal= Limnetica|volume= 31 |issue=1|pages= 59–76}}</ref> It can cannibalize eggs and fry.<ref>{{Cite journal | doi = 10.1007/BF00299233| journal=Behavioral Ecology and Sociobiology|year=1985| volume =18|issue =1|pages=15–18|title=Sex, cannibalism and sticklebacks|author=Whoriskey, F. G. |author2=FitzGerald, G. J. | s2cid=21522305|url=https://link.springer.com/article/10.1007%2FBF00299233}}</ref> |
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==Life history== |
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[[Image:GasterosteusAculeatusMaleHead.JPG|thumb|Male stickleback with red throat and shiny blue eye]] |
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Many populations take two years to mature and experience only one breeding season before dying, and some can take up to three years to reach maturity. However, some freshwater populations and populations at extreme latitudes can reach maturity in only one year. |
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==Reproduction== |
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[[File:Three-spined stickleback.jpg|thumb|Reproduction of the three-spined stickleback|left]] |
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[[File:Unsere Süßwasserfische (Tafel 4) (6102595905).jpg|thumb|right|Illustration of nesting three-spined sticklebacks]] |
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Sexual maturation depends on environmental temperature and photo-period.<ref name="O’Brien 2012">{{cite journal |last1=O’Brien |first1=Conor S. |last2=Bourdo |first2=Ryan |last3=Bradshaw |first3=William E. |last4=Holzapfel |first4=Christina M. |last5=Cresko |first5=William A. |title=Conservation of the photoperiodic neuroendocrine axis among vertebrates: Evidence from the teleost fish, ''Gasterosteus aculeatus'' |journal=General and Comparative Endocrinology |date=2012 |volume=178 |issue=1 |pages=19–27 |doi=10.1016/j.ygcen.2012.03.010|pmid=22504272 |pmc=3389224 }}</ref> Longer days and warmer days stimulate brighter colouration in males and the development of eggs in females. |
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From late April, males and females move from deeper waters to shallow areas. There, each male defends a [[territory (animal)|territory]] where he builds a nest on the bottom. He starts by digging a small pit. He then fills it with plant material (often filamentous algae), sand, and various debris which he glues together with spiggin, a proteinaceous substance secreted from the kidneys. The word spiggin is derived from ''spigg'', the Swedish name for the three-spined stickleback. He then creates a tunnel through the more or less spherical nest by swimming vigorously through it. Nest building typically takes 5–6 hours<ref>{{cite journal|author=van Iersel, J.J.A.|year= 1953|title=An analysis of the parental behaviour of the malethree-spined stickleback (''Gasterosteus aculeatus'' L.)|journal=Behaviour Supplement|volume= 3|issue= 3|pages= 1–159|jstor=30039128}}</ref> though it may also be spread out over several days. After this, the male courts gravid females that pass by with a zigzag dance. (In some populations, the male leads the female to the nest, rather than doing the zigzag dance.<ref name="Candolin 2001">{{cite journal |last1=Candolin |first1=U. |last2=Voigt |first2=H.-R. |title=No effect of a parasite on reproduction in stickleback males: a laboratory artefact? |journal=Parasitology |date=2001 |volume=122 |issue=4 |pages=457–464 |doi=10.1017/S0031182001007600|pmid=11315179 |s2cid=15544990 }}</ref>) He approaches a female by swimming very short distances left and right, and then swims back to the nest in the same way. If the female follows, the male often pokes his head inside the nest, and may swim through the tunnel. The female then swims through the tunnel as well, where she deposits 40–300 eggs. The male follows to fertilize the eggs. The female is then chased away by the male. For the duration of the eggs' development, the male will chase away other males and non-gravid females. He may, however, court other gravid females (more than one batch of eggs can be deposited in the same nest).{{Citation needed|date=August 2023}} |
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The sequence of territorial courtship and mating behaviours was described in detail by [[Niko Tinbergen]] in a landmark early study in [[ethology]]. Tinbergen showed that the red colour on the throat of the territorial male acts as a simple [[sign stimulus]], releasing aggression in other males and attracting females.<ref name="Tinbergen 1989">{{cite book |last1=Tinbergen |first1=Niko |title=The study of instinct |date=1989 |location=Oxford [England] |isbn=978-0198577225}}</ref> The red colouration may also be used by females as a way to assess male quality. Red colouration is produced from [[carotenoids]] found in the diet of the fish. As carotenoids cannot be synthesised ''de novo'', the degree of colouration gives an indication of male quality (ability to find food), with higher-quality males showing more intense colouration. Also, males that bear fewer parasites tend to exhibit brighter red colours. Many studies have shown that females prefer males with brighter red colouration.<ref>{{Cite journal | doi = 10.1038/344330a0|url=http://www.evolution.uni-bonn.de/arbeitsgruppen/evolutionaere-verhaltensoekologie-1/publikationen/1990-milinski-bakker-female-sticklebacks-use-male-coloration-in-mate-choice-and-hence-avoid-parasitized-males.pdf| title = Female sticklebacks use male coloration in mate choice and hence avoid parasitized males| journal = Nature| volume = 344| issue = 6264| pages = 330–333| year = 1990| last1 = Milinski | first1 = M. | last2 = Bakker | first2 = T. C. M. |bibcode=1990Natur.344..330M|s2cid=4322443}}</ref><ref>{{Cite journal | doi = 10.1139/z90-071| title = Experimental investigations of the evolutionary significance of sexually dimorphic nuptial colouration in ''Gasterosteus aculeatus'' (L.): The relationship between male colour and female behaviour| journal = Canadian Journal of Zoology| volume = 68| issue = 3| pages = 482–492| year = 1990| last1 = McLennan | first1 = D. A.| last2 = McPhail | first2 = J. D.}}</ref><ref>{{Cite journal | doi = 10.1093/beheco/5.1.74| title = Female mate choice and male red coloration in a natural three-spined stickleback (''Gasterosteus aculeatus'') population| journal = Behavioral Ecology| volume = 5| pages = 74–80| year = 1994| last1 = Bakker | first1 = T. C. M. | last2 = Mundwiler | first2 = B. | url = http://doc.rero.ch/record/295276/files/5-1-74.pdf}}</ref><ref>{{cite journal|author=Baube, C.L.|author2= Rowland, W.J.|author3=Fowler, J.B.|year= 1995|title=The mechanismsof colour-based mate choice in female threespine sticklebacks: hue, contrast and configurational cues|journal=Behaviour|volume=132|issue= 13/14|pages= 979–996|jstor=4535315|doi=10.1163/156853995x00405}}</ref> However, the response to red is not universal across the entire species,<ref>{{Cite journal | doi = 10.1016/0003-3472(95)80018-2| title = Video mate preferences of female three-spined sticklebacks from populations with divergent male coloration| journal = Animal Behaviour| volume = 50| issue = 6| pages = 1645–1655| year = 1995| last1 = McKinnon | first1 = J. S. | s2cid = 53193561}}</ref><ref name="Braithwaite 2000">{{cite journal |last1=Braithwaite |first1=Victoria A. |last2=Barber |first2=Iain |title=Limitations to colour-based sexual preferences in three-spined sticklebacks (''Gasterosteus aculeatus'') |journal=Behavioral Ecology and Sociobiology |date=2000 |volume=47 |issue=6 |pages=413–416 |doi=10.1007/s002650050684|s2cid=28383103 }}</ref> with black throated populations often found in peat-stained waters. |
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The male takes care of the developing eggs by fanning them. He lines himself up with the entrance of the nest tunnel and swims on the spot. The movement of his pectoral fins creates a current of water through the nest, bringing fresh (well-oxygenated) water to the eggs. He does this not only during the day, but throughout the night, as well.<ref>{{Cite journal | doi = 10.1139/z84-051| title = Diel patterns of fanning activity, egg respiration, and the nocturnal behavior of male three-spined sticklebacks, ''Gasterosteus aculeatus'' L. (f. ''trachurus'')| journal = Canadian Journal of Zoology| volume = 62| issue = 3| pages = 329–334| year = 1984| last1 = Reebs | first1 = S. G.| last2 = Whoriskey Jr. | first2 = F. G.| last3 = Fitzgerald | first3 = G. J.}}</ref> Fanning levels tend to increase until the eggs are about to hatch, which takes 7–8 days at 18–20 °C. Fanning levels also increase when the water is poorly oxygenated.<ref>{{cite journal|author=Seventer, P.|year= 1961|title=A causal study of a displacement activity (fanning in ''Gasterosteus aculeatus'' L.)|journal=Behaviour Supplement|volume=9|pages =1–170}}</ref> Towards the end of the egg development phase, the male often makes holes in the roof and near the rim of the nest, presumably to improve ventilation of the nest during fanning at a time when the eggs are more metabolically active. Once the young hatch, the male attempts to keep them together for a few days, sucking up any wanderers into his mouth and spitting them back into the nest. Afterwards, the young disperse and the nest is either abandoned by the male, or repaired in preparation for another breeding cycle. |
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In [[Nova Scotia]], a form of three-spined stickleback departs from the usual pattern of parental care. Unlike other sticklebacks that nest on the substrate, Nova Scotian male sticklebacks build nests in mats of filamentous algae. Surprisingly, almost immediately after fertilization, the males disperse the eggs from the nest and resume soliciting females for eggs. Hence, there appears to have been a loss of parental care in this population. Because these males have reduced dorsal pigmentation, resulting a pearlescent white appearance, they have been dubbed "white sticklebacks". It is currently unknown whether they are a distinct species, or simply a morph of the common Atlantic stickleback.<ref>{{Cite journal | doi = 10.1163/156853995x00522|jstor=4535330| title = Intertidal Breeding and Aerial Development of Embryos of a Stickleback Fish (Gasterosteus)| journal = Behaviour| volume = 132| issue = 15| pages = 1183–1206| year = 1995| last1 = MacDonald | first1 = J. F. | last2 = Bekkers | first2 = J.| last3 = MacIsaac | first3 = S. M. | last4 = Blouw | first4 = D. M. }}</ref><ref>{{Cite journal | doi = 10.1163/156853995x00531| title = Experiments on Embryo Survivorship, Habitat Selection, and Competitive Ability of a Stickleback Fish (Gasterosteus) Which Nests in the Rocky Intertidal Zone| journal = Behaviour| volume = 132| issue = 15| pages = 1207–1221| year = 1995| last1 = MacDonald | first1 = J. F. | last2 = MacIsaac | first2 = S. M. | last3 = Bekkers | first3 = J.| last4 = Blouw | first4 = D. M. }}</ref><ref>{{Cite journal | doi = 10.1139/z92-148| title = Field observations on the reproductive biology of a newly discovered stickleback (Gasterosteus)| journal = Canadian Journal of Zoology| volume = 70| issue = 5| pages = 1057–1063| year = 1992| last1 = Jamieson | first1 = I. G.| last2 = Blouw | first2 = D. M.| last3 = Colgan | first3 = P. W.}}</ref> |
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As the breeding cycle of the three-spined stickleback is light and temperature dependent, it is also possible to manipulate breeding in the lab. For example, it is possible to stimulate sticklebacks to breed twice in a calendar year, instead of once, under the right conditions.<ref name="Sattler 2020">{{cite journal |last1=Sattler |first1=Jessica L. |last2=Boughman |first2=Janette W. |title=Advancing breeding in stickleback ('' Gasterosteus aculeatus'') to produce two reproductive cycles per year |journal=Journal of Fish Biology |date=2020 |volume=97 |issue=5 |pages=1576–1581 |doi=10.1111/jfb.14517|pmid=32869321 |s2cid=221402138 }}</ref> This can be useful for genetic and behavioural multi-generational studies. |
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Infection with the cestode parasite ''Schistocephalus solidus'' can cause a reduction in egg mass or complete absence of eggs in female three-spined sticklebacks.<ref name='Heins 2003'>{{cite journal |last1=Heins |first1=David C. |last2=Baker |first2=John A. |title=Reduction of egg size in natural populations of threespine stickleback infected with a cestode macroparasite |journal=Journal of Parasitology |date=February 2003 |volume=89 |issue=1 |pages=1–6 |doi=10.1645/0022-3395(2003)089[0001:ROESIN]2.0.CO;2|pmid=12659295 |s2cid=24098353 }}</ref><ref name="McPhail 2011">{{cite journal |last1=McPhail |first1=J. D. |last2=Peacock |first2=S. D. |title=Some effects of the cestode (''Schistocephalus solidus'') on reproduction in the threespine stickleback (''Gasterosteus aculeatus''): evolutionary aspects of a host–parasite interaction |journal=Canadian Journal of Zoology |date=2011 |volume=61 |issue=4 |pages=901–908 |doi=10.1139/z83-118}}</ref><ref name="Heins 1999">{{cite journal |last1=Heins |first1=David C |last2=Singer |first2=Scarlet S |last3=Baker |first3=John A |title=Virulence of the cestode ''Schistocephalus solidus'' and reproduction in infected threespine stickleback, ''Gasterosteus aculeatus'' |journal=Canadian Journal of Zoology |date=1999 |volume=77 |issue=12 |pages=1967–1974 |doi=10.1139/z99-180}}</ref> |
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==Cooperative behavior== |
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Some evidence indicates the existence of cooperative behavior among three-spined sticklebacks, mainly cooperative [[predator]] inspection. Predator inspection appears to allow acquisition of information about the risk a potential predator presents, and may deter attack, with the cost being an increased chance of being attacked if the predator proves to be hungry. |
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===Tit for tat strategy=== |
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Sticklebacks are known to cooperate in a [[tit for tat]] (TFT) strategy when doing predator inspection. The idea behind TFT is that an individual cooperates on the first move and then does whatever its opponent does on the previous move. This allows for a combination of collaborative (it starts by cooperating), retaliatory (punishes defection), and forgiving (respond to cooperation of others, even if they had defected previously) behavioral responses.<ref>{{cite book|author=Nicholas B. Davies|author2=John R. Krebs|author3=Stuart A. West|title=An introduction to behavioural ecology|publisher=Wiley-Blackwell|location=Oxford|isbn=978-1-4051-1416-5|edition=4th|date=2012-04-02}}</ref> When three-spined sticklebacks approaching a live predator were provided with either a simulated cooperating companion or a simulated defecting one, the fish behaved according to tit-for-tat strategy, supporting the hypothesis that cooperation can evolve among egoists.<ref>{{cite journal|last=Milinski|first=Manfred|title=TIT FOR TAT in sticklebacks and the evolution of cooperation|journal=Nature|year=1987|volume=325|issue=29|pages=433–435|doi=10.1038/325433a0|bibcode=1987Natur.325..433M|pmid=3808044|s2cid=4320531}}</ref> |
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Typically, sticklebacks operate in pairs. Individuals have partners with which they repeatedly perform pairwise predator inspection visits. Two reciprocal pairs per trial occur significantly more often than what was expected due to chance. These results provide further evidence for a tit-for-tat cooperation strategy in sticklebacks.<ref>{{cite journal|last=Milinski|first=Manfred|author2=D. Pfluger |author3=D. Kulling |author4=R. Kettler |title=Do sticklebacks cooperate repeatedly in reciprocal pairs?|journal=Behavioral Ecology and Sociobiology|year=1990|volume=27|issue=1|pages=17–21|doi=10.1007/bf00183308|s2cid=27982566}}</ref> |
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Stickleback behavior is often cited as an archetypal example of cooperative behavior during predator inspection. Fish from three sites differing in predation risk inspected a model predator in pairs and reciprocated both cooperative moves and defections by the partner, but not on every opportunity.<ref name=Huntingford>{{cite journal|last=Huntingford|first=Felicity|author2=John Lazarus |author3=Brian Barrie |author4=Sally Webb |title=A dynamic analysis of cooperative predator inspection in sticklebacks|journal=Animal Behaviour|year=1994|volume=47|issue=2|pages=413–423|doi=10.1006/anbe.1994.1055|s2cid=53156278}}</ref> Sticklebacks that originated in the two sites containing [[piscivorous]] fish were more likely to reciprocate following a cooperative move than following a defection. Individuals from higher-risk sites were generally more cooperative.<ref name=Huntingford /> Individuals accompanied by a model companion show reciprocal moves of cooperation and defection in response to the model's movements about a third of the time. Both examples of stickleback behavior demonstrate the elements of a strategy of cooperation that may resemble tit-for-tat.<ref name=Huntingford /> |
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===Partner-dependence=== |
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The tit-for-tat cooperation strategy has been shown to be evident in sticklebacks. In addition, the size of a stickleback's partner fish may also be a factor in determining what a stickleback will do when both fish are faced with a predator. Two sticklebacks simultaneously presented to a [[rainbow trout]], a predator much larger in size, will have differing risks of being attacked. Usually, the larger of the two sticklebacks has a higher risk of being attacked.<ref name=Kulling>{{cite journal|last=Kulling|first=David|author2=Manfred Milinski |title=Size-dependent predation risk and partner quality in predator inspection of sticklebacks|journal=Animal Behaviour|year=1992|volume=44|issue=5|pages=949–955|doi=10.1016/s0003-3472(05)80590-1|s2cid=53161426}}</ref> Individual sticklebacks are more likely to move closer to a [[trout]] (or some other predator) when a larger potential partner moves close to the trout than when a smaller partner approaches the trout.<ref name=Kulling /> Although both large and small partners behave similarly, a small partner's behavior affects the strategy of the test fish more than that of the large partner.<ref name=Kulling /> Regardless of whether it is alone or with a partner that cooperates, a larger fish will approach a predator more closely than does a smaller fish.<ref name=Kulling /> If a partner defects, then a stickleback's condition-factor (i.e. its ability to flee) determines how closely it approaches the predator rather than the stickleback's size.<ref name=Kulling /> Both the strategy and reaction to different-sized partners seem to be dependent on whether the partner cooperates or defects. |
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==Parasites== |
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[[File:Stickleback with Schostocephalus (cropped).jpg|thumb|right|Stickleback next to extracted ''Schistocephalus solidus'' plerocercoids]] |
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The three-spined stickleback is a secondary intermediate host for the hermaphroditic parasite ''[[Schistocephalus solidus]]'', a tapeworm of fish and fish-eating birds. The tapeworm passes into sticklebacks through its first intermediate hosts, cyclopoid copepods, when these are eaten by the fish. The parasite matures into its third larval stage, the plerocercoid, in the abdomen of the stickleback. Infected sticklebacks are afterwards consumed by fish-eating birds, which serve as the tapeworm's definitive host.<ref name="LoBue 1993">{{cite journal |last1=LoBue |first1=C. P. |last2=Bell |first2=M. A. |title=Phenotypic manipulation by the Cestode parasite ''Schistocephalus solidus'' of its intermediate host, ''Gasterosteus aculeatus'', the Threespine Stickleback |journal=[[The American Naturalist]] |date=1993 |volume=142 |issue=4 |pages=725–735 |doi=10.1086/285568}}</ref><ref name="Dubinina 1980">{{cite book |last1=Dubinina |first1=M. N. |title=Tapeworms (Cestoda, Ligulidae) of the fauna of the USSR |date=1980 |url=https://www.cabdirect.org/cabdirect/abstract/19800874287}}</ref> |
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Another common parasite of the three-spined stickleback is the [[microsporidia]]n ''[[Glugea anomala]]''.<ref name="Petkova 2018">{{cite journal |last1=Petkova |first1=I. |last2=Abbey-Lee |first2=R. N. |last3=Løvlie |first3=H. |title=Parasite infection and host personality: ''Glugea''-infected three-spined sticklebacks are more social |journal=[[Behavioral Ecology and Sociobiology]] |date=2018 |volume=72 |issue=11 |doi=10.1007/s00265-018-2586-3|pmc=6182751 }}</ref> Naturally infections with ''G. anomala'' lose weight compared to uninfected individuals,<ref name="Ward 2005">{{cite journal |last1=Ward |first1=A. J. W. |last2=Duff |first2=A. J. |last3=Krause |first3=J. |last4=Barber |first4=I. |title=Shoaling behaviour of sticklebacks infected with the microsporidian parasite, ''Glugea anomala'' |journal=[[Environmental Biology of Fishes]] |date=2005 |volume=72 |issue=2 |pages=155–160 |doi=10.1007/s10641-004-9078-1}}</ref> but do not cause size differences between individuals.<ref name="Petkova 2018" /> ''Glugea anomala'' also correlates behavioural changes, such as increased shoaling,<ref name="Ward 2005" /> increased sociability and activity, and reduced boldness.<ref name="Petkova 2018" /><ref name="Abbey-Lee 2019">{{cite journal |last1=Abbey-Lee |first1=R. N. |last2=Kreshchenko |first2=A. |last3=Fernandez Sala |first3=X. |last4=Petkova |first4=I. |last5=Løvlie |first5=H. |title=Effects of monoamine manipulations on the personality and gene expression of three-spined sticklebacks |journal=[[Journal of Experimental Biology]] |date=2019 |volume=222 |issue=20 |doi=10.1242/jeb.211888}}</ref> It is unknown whether these differences in behaviour are due to certain [[Personality in animals|personality traits]] predisposing individuals to infections, or whether [[Behavior-altering parasite|infections change behaviour]]. |
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==Genetics== |
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Three-spined sticklebacks have recently become a major research organism for evolutionary biologists trying to understand the genetic changes involved in adapting to new environments. The entire genome of a female fish from Bear Paw Lake in [[Alaska]] was recently sequenced by the [[Broad Institute]] and many other genetic resources are available.<ref>{{cite web|title = Stickleback Genome at ENSEMBL| url = http://www.ensembl.org/Gasterosteus_aculeatus/Info/Index}}</ref> This population is under risk from the presence of introduced [[northern pike]] in a nearby lake. Three-spined sticklebacks are also used for researching sex-specific brain gene expression. Parents exposed to predator models produced offspring with different gene expressions compared to those that were not exposed to predators. Non-overlapping genes appear highly influenced by the sex of the parent, with genes being differentially expressed in offspring based on whether the male or female parent was exposed to predation.<ref>{{cite journal|last1=Hellmann|first1=Jennifer|last2=Bukhari|first2=Syed|last3=Deno|first3=Jack|last4=Bell|first4=Alison|date=November 15, 2020|title=Sex-specific plasticity across generations I: Maternal and paternal effects on sons and daughters|journal=Journal of Animal Ecology|volume=89|issue=12|pages=2788–2799|doi=10.1111/1365-2656.13364|pmid=33191518|pmc=7902357}}</ref> |
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== Eco-evolutionary dynamics == |
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{{Main|Eco-evolutionary dynamics}} |
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Three-spined stickleback research has been central to the field of eco-evolutionary dynamics.<ref name=":1">Hendry, A. P., C. L. Peichel, B. Matthews, J. W. Boughman, and P. Nosil. 2013. Stickleback research: The now and the next. Evolutionary Ecology Research 15:111–141.</ref><ref name=":2">Beckerman, A. P., D. Z. Childs, and A. O. Bergland. 2016. Eco-evolutionary biology: Feeding and feedback loops. Current Biology 26:R161–R164.</ref> Eco-evolutionary dynamics is an area of study investigating how ecological processes (e.g., [[population dynamics]], [[Community (ecology)|community interactions]], and [[Nutrient cycle|nutrient cycling]]) affect how populations evolve, and in turn, how these patterns of evolution feed back to affect ecological processes.<ref name=":3">Schoener, T. W. 2011. The Newest Synthesis: Understanding Ecological Dynamics. Science 331:426–429.</ref><ref>Brunner, F. S., J. A. Deere, M. Egas, C. Eizaguirre, and J. A. M. Raeymaekers. 2019. The diversity of eco-evolutionary dynamics: Comparing the feedbacks between ecology and evolution across scales. Functional Ecology 33:7–12.</ref> Importantly, these dynamics arise when substantial evolutionary change occurs on the same time scale as ecological change (i.e., less than 1,000 generations).<ref name=":3" /><ref>Fussmann, G. F., M. Loreau, and P. A. Abrams. 2007. Eco-evolutionary dynamics of communities and ecosystems. Functional Ecology 21:465–477.</ref><ref>Ellner, S. P. 2013. Rapid evolution: From genes to communities, and back again? Functional Ecology 27:1087–1099.</ref> Three-spined stickleback are particularly useful for studying eco-evolutionary dynamics because multiple populations have evolved rapidly and in predictable, repeated patterns after colonizing new environments.<ref name=":1" /><ref name=":4">Bell, M. A., and W. E. Aguirre. 2013. Contemporary evolution, allelic recycling, and adaptive radiation of the threespine stickleback. Evolutionary Ecology Research 15:377–411.</ref> These repeated patterns of evolution allow scientists to assess whether the impacts of stickleback evolution on ecological processes are reproducible. |
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An eco-evolutionary framework has been used to explore multiple aspects of stickleback biology. Notably, this research has focused on how populations of three-spined stickleback have diverged to occupy different [[ecological niche]]s (a process called [[adaptive radiation]]) and how sticklebacks have [[Coevolution|coevolved]] with their parasites.<ref name=":1" /><ref name=":2" /> |
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=== Eco-evolutionary dynamics of adaptive radiation === |
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Most eco-evolutionary dynamics research in sticklebacks has focused on how the [[adaptive radiation]] of different [[ecotype]]s affects ecological processes.<ref name=":1" /><ref name=":2" /><ref name=":5">Harmon, L. J., B. Matthews, S. Des Roches, J. M. Chase, J. B. Shurin, and D. Schluter. 2009. Evolutionary diversification in stickleback affects ecosystem functioning. Nature 458:1167–1170.</ref><ref name=":6">Matthews, B., T. Aebischer, K. E. Sullam, B. Lundsgaard-Hansen, and O. Seehausen. 2016. Experimental evidence of an eco-evolutionary feedback during adaptive Divergence. Current Biology 26:483–489.</ref><ref name=":7">Rudman, S. M., and D. Schluter. 2016. Ecological impacts of reverse speciation in threespine stickleback. Current Biology 26:490–495.</ref> Ecotypes represent genetically and morphologically recognizable populations occupying distinct [[ecological niche]]s.<ref name=":4" /><ref name=":5" /><ref name=":6" /><ref name=":8">Fur, C. G., F. A. von Hippel, and M. A. Bell. 2012. Partial reproductive isolation of a recently derived resident-freshwater population of threespe stickleback (Gasterosteus aculeatus) from its putative anadromous ancestor. Evolution 66:3277–3286.</ref><ref name=":9">Berner, D., M. Roesti, A. P. Hendry, and W. Salzburger. 2010. Constraints on speciation suggested by comparing lake-stream stickleback divergence across two continents. Molecular Ecology 19:4963–4978.</ref> In three-spined stickleback, divergent ecotypes are often found as [[Sympatric speciation|sympatric]] (i.e., co-occurring) or [[Parapatric speciation|parapatric]] (i.e., partially overlapping, but mostly isolated) species pairs, including [[Benthic zone|benthic]]—[[Limnetic zone|limnetic]] pairs,<ref name=":5" /> freshwater—[[Fish migration|anadromous]] pairs,<ref name=":8" /> and lake—stream pairs.<ref name=":6" /><ref name=":9" /> Pairs of stickleback ecotypes have diverged at time scales ranging from 10,000 years to only decades ago.<ref name=":4" /><ref name=":8" /> |
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Different combinations of stickleback ecotypes affect ecosystem processes in different ways. For example, the combined presence of specialized benthic and limnetic sticklebacks has a different effect on the diversity and abundance of prey species compared to the presence of only a generalist ancestral stickleback ecotype.<ref name=":5" /> Notably, this effect appears to be driven by limnetic sticklebacks specializing on [[zooplankton]] prey, rather than by an increase in the number of co-occurring stickleback species alone.<ref name=":5" /> The impacts of ecotype [[Specialization (biology)|specialization]] on prey communities can even affect the abundance of [[algae]] and [[cyanobacteria]] that do not directly interact with sticklebacks, along with aspects of the abiotic environment,<ref name=":5" /><ref name=":6" /> such as the amount of ambient light available for [[photosynthesis]]<ref name=":5" /> and levels of dissolved oxygen,<ref name=":5" /> carbon,<ref name=":7" /> and phosphorus.<ref name=":6" /> These diverse changes in ecosystem processes can persist to affect [[natural selection]] on subsequent stickleback generations,<ref name=":6" /> potentially shaping how stickleback populations will evolve in the future. Because the presence of specialist verses generalist ecotypes can impact ecosystems in a way that, in turn, affects selection on future stickleback generations, the adaptive radiation of specialized ecotypes could drive eco-evolutionary feedback loops in natural populations.<ref name=":6" /> |
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=== Eco-evolutionary dynamics of host-parasite interactions === |
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Sticklebacks have also been studied to investigate the eco-evolutionary dynamics of [[Host–parasite coevolution|host-parasite coevolution]].<ref name=":10">Brunner, F. S., J. M. Anaya-Rojas, B. Matthews, and C. Eizaguirre. 2017. Experimental evidence that parasites drive eco-evolutionary feedbacks. Proceedings of the National Academy of Sciences of the United States of America 114:3678–3683.</ref><ref name=":11">Weber, J. N., M. Kalbe, K. C. Shim, N. I. Erin, N. C. Steinel, L. Ma, and D. I. Bolnick. 2017. Resist globally, infect locally: A transcontinental test of adaptation by stickleback and their tapeworm parasite. American Naturalist 189:43–57.</ref><ref name=":12">Bolnick, D. I., E. J. Resetarits, K. Ballare, Y. E. Stuart, and W. E. Stutz. 2020. Scale-dependent effects of host patch traits on species composition in a stickleback parasite metacommunity. Ecology 101:1–16.</ref> Three-spined sticklebacks can be hosts to a variety of parasites (e.g., ''[[Schistocephalus solidus]]'', a common tapeworm of fish and fish-eating birds<ref name="LoBue 1993" />). The diversity of parasite species within individual stickleback is influenced by an individual's dietary niche and immune response.<ref name=":12" /> This covariation between parasite infection and host traits is likely a consequence of eco-evolutionary feedback, whereby the evolution of dietary and parasite resistance traits in sticklebacks alters parasite reproduction and infection rates, which in turn affects parasite exposure and selection on parasite resistance in sticklebacks.<ref name=":11" /> These feedbacks can also extend beyond stickleback-parasite interactions to modify ecosystem processes.<ref name=":10" /> Specifically, differences in resistance and infection rates among stickleback ecotypes can alter how sticklebacks affect the abundance of prey species and levels of dissolved nutrients and oxygen.<ref name=":10" /> These ecosystem impacts can further affect selection on sticklebacks in subsequent generations, which suggests a complex feedback loop between the evolution of host-parasite interactions, community composition, and abiotic conditions.<ref name=":10" /> |
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=== Common methods === |
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Many researchers have used [[mesocosm]] experiments to test how the adaptive radiation of stickleback ecotypes and stickleback-parasite interactions can impact ecological processes.<ref name=":1" /><ref name=":5" /><ref name=":6" /><ref name=":7" /><ref name=":10" /> In these experiments, researchers simulate the natural environments of sticklebacks in enclosed tanks, including natural plant and invertebrate communities and [[Aquatic ecosystem#Lentic ecosystem (lakes)|freshwater ecological zones]].<ref name=":5" /><ref name=":6" /><ref name=":7" /><ref name=":10" /> They then systematically manipulate an [[Dependent and independent variables|independent variable]] (e.g., which stickleback ecotypes were present or the presence of parasites), and measured differences in biotic and abiotic aspects of ecosystems among the different stickleback treatments.<ref name=":2" /><ref name=":6" /><ref name=":7" /><ref name=":10" /> In some cases, researchers have then tested for potential feedback loops between ecotype evolution and ecological change by removing the adult stickleback from the mesocosms and replacing them with juveniles of different ecotypes.<ref name=":6" /><ref name=":10" /> By doing so, the researchers could then measure how the effects of adult sticklebacks on their ecosystems influenced overall juvenile [[Fitness (biology)|fitness]] (e.g., survival and growth rates) and differences in fitness between juveniles of different ecotypes.<ref name=":6" /><ref name=":10" /> |
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==References==<!-- BiolJLinnSoc95:505. --> |
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{{Reflist|30em}} |
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==Further reading== |
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* Wootton, R.J. 1976. The biology of the sticklebacks. Academic Press, London. |
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* Bell, M.A., and Foster, S.A. (eds.) 1994. The evolutionary biology of the three-spined stickleback. Oxford University Press, New York. |
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* Ostlund-Nilsson, S., Mayer, I., and Huntingford, F.A. (eds.) 2007. Biology of the three-spined stickleback. CRC Press, Boca Raton. |
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==External links== |
==External links== |
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{{Commons category|Gasterosteus aculeatus}} |
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*[http://www.geocities.com/CapeCanaveral/Hall/1345/stickbibl.html Bibliography of scientific research using sticklebacks] |
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*{{ITIS |id=166365 |taxon=Gasterosteus aculeatus |access-date=19 March 2006}} |
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*[http://www.dfo-mpo.gc.ca/species-especes/species/species_searchSpecies_e.asp The section of the Canadian Species at Risk Act dealing with the species pairs] |
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*View the [http://www.ensembl.org/Gasterosteus_aculeatus/index.html stickleback genome] in [[Ensembl]] |
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{{Authority control}} |
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{{Taxonbar|from=Q203572}} |
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[[Category:Arctic freshwater fish]] |
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[[Category:Gasterosteiformes]] |
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[[Category:Gasterosteus|three-spined stickleback]] |
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[[da:Trepigget hundestejle]] |
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[[Category:Fish of the North Pacific]] |
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[[Category:Fish of the North Atlantic]] |
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[[fo:Kombikk]] |
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[[Category:Fish of the Great Lakes]] |
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[[lt:Trispyglė dyglė]] |
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[[Category:Freshwater fish of Europe]] |
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[[nl:Driedoornige stekelbaars]] |
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[[Category:Fauna of the San Francisco Bay Area]] |
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[[ja:イトヨ]] |
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[[Category:Western North American coastal fauna]] |
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[[pl:Ciernik]] |
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[[Category:Fauna of Atlantic Canada]] |
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[[fi:Kolmipiikki]] |
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[[Category:Fauna of the Northeastern United States]] |
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[[wa:Spinoke]] |
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[[Category:Fish described in 1758|three-spined stickleback]] |
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[[Category:Taxa named by Carl Linnaeus|three-spined stickleback]] |
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[[Category:Fish of the Baltic Sea]] |
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[[Category:Serravallian first appearances]] |
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[[Category:Extant Miocene first appearances]] |
Latest revision as of 23:49, 7 December 2024
Three-spined stickleback Temporal range: Middle Miocene to present,
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | Perciformes |
Family: | Gasterosteidae |
Genus: | Gasterosteus |
Species: | G. aculeatus
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Binomial name | |
Gasterosteus aculeatus | |
Distribution of Gasterosteus aculeatus, with observations (dots; based on [2]) and distribution (shaded area; based on https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=702) | |
Synonyms[3] | |
List
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The three-spined stickleback (Gasterosteus aculeatus) is a fish native to most inland and coastal waters north of 30°N. It has long been a subject of scientific study for many reasons. It shows great morphological variation throughout its range, ideal for questions about evolution and population genetics. Many populations are anadromous (they live in seawater but breed in fresh or brackish water) and very tolerant of changes in salinity, a subject of interest to physiologists. It displays elaborate breeding behavior (defending a territory, building a nest, taking care of the eggs and fry) and it can be social (living in shoals outside the breeding season) making it a popular subject of inquiry in fish ethology and behavioral ecology. Its antipredator adaptations, host-parasite interactions, sensory physiology, reproductive physiology, and endocrinology have also been much studied. Facilitating these studies is the fact that the three-spined stickleback is easy to find in nature and easy to keep in aquaria.[4]
Evolution
[edit]The three-spined stickleback appears to be a rather old species that has remained morphologically unchanged for more than 10 million years. The oldest record of the species is from the Alta Mira Shale of the Monterey Formation of California, which preserves an articulated skeleton that appears essentially identical to the modern G. aculeatus complex. A slightly younger specimen is known from diatomite deposits from Lompoc that also belong to the Monterey Formation. Both specimens are known from marine deposits, suggesting a marine or anadramous lifestyle. The presence of the three-spined stickleback in the Miocene suggests that the three-spined stickleback complex must have diverged from the blackspotted stickleback prior to this point.[5][6]
Description
[edit]This species can occasionally reach lengths of 8 cm (3.1 in), but lengths of 3–4 centimetres (1.2–1.6 in) at maturity are more common. The body is laterally compressed. The base of the tail is slender. The caudal fin has 12 rays. The dorsal fin has 10–14 rays; in front of it are the three spines that give the fish its name (though some individuals may have only two or four). The third spine (the one closest to the dorsal fin) is much shorter than the other two. The back of each spine is joined to the body by a thin membrane. The anal fin has eight to 11 rays and is preceded by a short spine. The pelvic fins consist of just a spine and one ray. All spines can be locked in an erect position, making the fish extremely hard to swallow by a predator. The pectoral fins are large, with 10 rays. The body bears no scales, but is protected by bony plates on the back, flanks, and belly. Only one ventral plate is present, but the number of flank plates varies greatly across the distribution range and across habitat types (see below); it is normally higher in marine populations (some freshwater populations may in fact lack lateral plates altogether).[3]
Dorsal coloration varies, but tends towards a drab olive or a silvery green, sometimes with brown mottling. The flanks and belly are silvery. In males during the breeding season, the eyes become blue and the lower head, throat, and anterior belly turn bright red. The throat and belly of breeding females can turn slightly pink. A few populations, however, have breeding males which are all black[7] or all white.[8]
Habitat and distribution
[edit]The three-spined stickleback is found only in the Northern Hemisphere, where it usually inhabits coastal waters or freshwater bodies. It can live in either fresh, brackish, or salt water. It prefers slow-flowing water with areas of emerging vegetation. It can be found in ditches, ponds, lakes, backwaters, quiet rivers, sheltered bays, marshes, and harbours.
In North America, it ranges along the East Coast from Chesapeake Bay to the southern half of Baffin Island and the western shore of Hudson Bay, and along the West Coast from southern California to the western shore of Alaska and the Aleutian Islands. It can be found throughout Europe between 35 and 70°N. In Asia, the distribution stretches from Japan and the Korean peninsula to the Bering Straits.
Its distribution could be said to be circumpolar were it not for the fact that it is absent from the north coast of Siberia, the north coast of Alaska, and the Arctic islands of Canada.
Variation in morphology and distribution
[edit]Three subspecies are currently recognized by the IUCN:
- G. a. aculeatus is found in most of the species range, and is the subspecies most strictly termed the three-spined stickleback; its common name in Britain is the tiddler, although "tittlebat" is also sometimes used.
- G. a. williamsoni, the unarmored threespine stickleback, is found only in North America; its recognised range is southern California, though isolated reports have been made of it occurring in British Columbia and Mexico;
- G. a. santaeannae, the Santa Ana stickleback, is also restricted to North America.
These subspecies actually represent three examples from the enormous range of morphological variation present within three-spined sticklebacks. Hybrids between some of these morphs show foraging disadvantages, a form of reinforcement in the course of speciation. This is evidence for speciation by reinforcement.[9]
Overall these morphs fall into two rough categories, the anadromous and the freshwater forms:
The anadromous form spends most of its adult life eating plankton and fish in the sea, and returns to freshwater to breed. The adult fish are typically between 6 and 10 cm long, and have 30 to 40 lateral armour plates along their sides. They also have long dorsal and pelvic spines. The anadromous form is morphologically similar all around the Northern Hemisphere, such that anadromous fish from the Baltic, the Atlantic and the Pacific all resemble each other quite closely.
Three-spined stickleback populations are also found in freshwater lakes and streams. These populations were probably formed when anadromous fish started spending their entire lifecycle in fresh water, and thus evolved to live there all year round. Freshwater populations are extremely morphologically diverse, to the extent that many observers (and some taxonomists) would describe a new subspecies of three-spined stickleback in almost every lake in the Northern Hemisphere. One consistent difference between freshwater populations and their anadromous ancestors is the amount of body armour, as the majority of freshwater fish only have between none and 12 lateral armor plates, and shorter dorsal and pelvic spines. However, also large morphological differences occur between lakes. One major axis of variation is between populations found in deep, steep-sided lakes and those in small, shallow lakes. The fish in the deep lakes typically feed in the surface waters on plankton, and often have large eyes, with short, slim bodies and upturned jaws. Some researchers refer to this as the limnetic form. Fish from shallow lakes feed mainly on the lake bed, and are often long and heavy bodied with relatively horizontal jaws and small eyes. These populations are referred to as the benthic form.
Since each watershed was probably colonised separately by anadromous sticklebacks, morphologically similar populations in different watersheds or on different continents are widely believed to have evolved independently. A unique population is found in the meromictic Pink Lake in Gatineau Park, Quebec. Populations have been observed rapidly adapting to different conditions, such as in Lake Union, where sticklebacks have lost and regained armor plates in response to pollution from human activity around the watershed.[10][11][12][13]
One aspect of this morphological variation is that a number of lakes contain both a limnetic and a benthic type, and these do not interbreed with each other. Evolutionary biologists often define species as populations that do not interbreed with each other (the biological species concept), thus the benthics and limnetics within each lake would constitute separate species. These species pairs are an excellent example of how adaptation to different environments (in this case feeding in the surface waters or on the lake bed) can generate new species. This process has come to be termed ecological speciation. This type of species pair is found in British Columbia. The lakes themselves only contain three-spined sticklebacks and cutthroat trout, and all are on islands. Tragically, the pair in Hadley Lake on Lasqueti Island was destroyed in the mid-1980s by the introduction of a predatory catfish, and the pair in Enos Lake on Vancouver Island has started to interbreed and are no longer two distinct species.[14] The two remaining pairs are on Texada Island, in Paxton Lake and Priest Lake, and they are listed as Endangered in the Canadian Species at Risk Act.[15]
Other species pairs which consist of a well-armored marine form and a smaller, unarmored freshwater form are being studied in ponds and lakes in south-central Alaska that were once marine habitats such as those uplifted during the 1964 Alaska earthquake. The evolutionary dynamics of these species pairs are providing a model for the processes of speciation which has taken place in less than 20 years in at least one lake. In 1982, a chemical eradication program intended to make room for trout and salmon at Loberg Lake, Alaska, killed the resident freshwater populations of sticklebacks. Oceanic sticklebacks introduced through nearby Cook Inlet recolonized the lake. In just 12 years beginning in 1990, the frequency of the oceanic form dropped steadily, from 100% to 11%, while a variety with fewer plates increased to 75% of the population, with various intermediate forms making up another small fraction.[16] This rapid evolution is thought to be possible through genetic variations that confer competitive advantages for survival in fresh water when conditions shift rapidly from salt to fresh water. However, the actual molecular basis of this evolution still remains unknown.
Although sticklebacks are found in many locations around the coasts of the Northern Hemisphere and are thus viewed by the IUCN as species of least concern, the unique evolutionary history encapsulated in many freshwater populations indicates further legal protection may be warranted.[1]
Diet
[edit]In its different forms or stages of life, the three-spined stickleback can be a bottom-feeder (most commonly chironomid larvae and amphipods)[17] or a planktonic feeder in lakes or in the ocean; it can also consume terrestrial prey fallen to the surface.[18] It can cannibalize eggs and fry.[19]
Life history
[edit]Many populations take two years to mature and experience only one breeding season before dying, and some can take up to three years to reach maturity. However, some freshwater populations and populations at extreme latitudes can reach maturity in only one year.
Reproduction
[edit]Sexual maturation depends on environmental temperature and photo-period.[20] Longer days and warmer days stimulate brighter colouration in males and the development of eggs in females.
From late April, males and females move from deeper waters to shallow areas. There, each male defends a territory where he builds a nest on the bottom. He starts by digging a small pit. He then fills it with plant material (often filamentous algae), sand, and various debris which he glues together with spiggin, a proteinaceous substance secreted from the kidneys. The word spiggin is derived from spigg, the Swedish name for the three-spined stickleback. He then creates a tunnel through the more or less spherical nest by swimming vigorously through it. Nest building typically takes 5–6 hours[21] though it may also be spread out over several days. After this, the male courts gravid females that pass by with a zigzag dance. (In some populations, the male leads the female to the nest, rather than doing the zigzag dance.[22]) He approaches a female by swimming very short distances left and right, and then swims back to the nest in the same way. If the female follows, the male often pokes his head inside the nest, and may swim through the tunnel. The female then swims through the tunnel as well, where she deposits 40–300 eggs. The male follows to fertilize the eggs. The female is then chased away by the male. For the duration of the eggs' development, the male will chase away other males and non-gravid females. He may, however, court other gravid females (more than one batch of eggs can be deposited in the same nest).[citation needed]
The sequence of territorial courtship and mating behaviours was described in detail by Niko Tinbergen in a landmark early study in ethology. Tinbergen showed that the red colour on the throat of the territorial male acts as a simple sign stimulus, releasing aggression in other males and attracting females.[23] The red colouration may also be used by females as a way to assess male quality. Red colouration is produced from carotenoids found in the diet of the fish. As carotenoids cannot be synthesised de novo, the degree of colouration gives an indication of male quality (ability to find food), with higher-quality males showing more intense colouration. Also, males that bear fewer parasites tend to exhibit brighter red colours. Many studies have shown that females prefer males with brighter red colouration.[24][25][26][27] However, the response to red is not universal across the entire species,[28][29] with black throated populations often found in peat-stained waters.
The male takes care of the developing eggs by fanning them. He lines himself up with the entrance of the nest tunnel and swims on the spot. The movement of his pectoral fins creates a current of water through the nest, bringing fresh (well-oxygenated) water to the eggs. He does this not only during the day, but throughout the night, as well.[30] Fanning levels tend to increase until the eggs are about to hatch, which takes 7–8 days at 18–20 °C. Fanning levels also increase when the water is poorly oxygenated.[31] Towards the end of the egg development phase, the male often makes holes in the roof and near the rim of the nest, presumably to improve ventilation of the nest during fanning at a time when the eggs are more metabolically active. Once the young hatch, the male attempts to keep them together for a few days, sucking up any wanderers into his mouth and spitting them back into the nest. Afterwards, the young disperse and the nest is either abandoned by the male, or repaired in preparation for another breeding cycle.
In Nova Scotia, a form of three-spined stickleback departs from the usual pattern of parental care. Unlike other sticklebacks that nest on the substrate, Nova Scotian male sticklebacks build nests in mats of filamentous algae. Surprisingly, almost immediately after fertilization, the males disperse the eggs from the nest and resume soliciting females for eggs. Hence, there appears to have been a loss of parental care in this population. Because these males have reduced dorsal pigmentation, resulting a pearlescent white appearance, they have been dubbed "white sticklebacks". It is currently unknown whether they are a distinct species, or simply a morph of the common Atlantic stickleback.[32][33][34]
As the breeding cycle of the three-spined stickleback is light and temperature dependent, it is also possible to manipulate breeding in the lab. For example, it is possible to stimulate sticklebacks to breed twice in a calendar year, instead of once, under the right conditions.[35] This can be useful for genetic and behavioural multi-generational studies.
Infection with the cestode parasite Schistocephalus solidus can cause a reduction in egg mass or complete absence of eggs in female three-spined sticklebacks.[36][37][38]
Cooperative behavior
[edit]Some evidence indicates the existence of cooperative behavior among three-spined sticklebacks, mainly cooperative predator inspection. Predator inspection appears to allow acquisition of information about the risk a potential predator presents, and may deter attack, with the cost being an increased chance of being attacked if the predator proves to be hungry.
Tit for tat strategy
[edit]Sticklebacks are known to cooperate in a tit for tat (TFT) strategy when doing predator inspection. The idea behind TFT is that an individual cooperates on the first move and then does whatever its opponent does on the previous move. This allows for a combination of collaborative (it starts by cooperating), retaliatory (punishes defection), and forgiving (respond to cooperation of others, even if they had defected previously) behavioral responses.[39] When three-spined sticklebacks approaching a live predator were provided with either a simulated cooperating companion or a simulated defecting one, the fish behaved according to tit-for-tat strategy, supporting the hypothesis that cooperation can evolve among egoists.[40]
Typically, sticklebacks operate in pairs. Individuals have partners with which they repeatedly perform pairwise predator inspection visits. Two reciprocal pairs per trial occur significantly more often than what was expected due to chance. These results provide further evidence for a tit-for-tat cooperation strategy in sticklebacks.[41]
Stickleback behavior is often cited as an archetypal example of cooperative behavior during predator inspection. Fish from three sites differing in predation risk inspected a model predator in pairs and reciprocated both cooperative moves and defections by the partner, but not on every opportunity.[42] Sticklebacks that originated in the two sites containing piscivorous fish were more likely to reciprocate following a cooperative move than following a defection. Individuals from higher-risk sites were generally more cooperative.[42] Individuals accompanied by a model companion show reciprocal moves of cooperation and defection in response to the model's movements about a third of the time. Both examples of stickleback behavior demonstrate the elements of a strategy of cooperation that may resemble tit-for-tat.[42]
Partner-dependence
[edit]The tit-for-tat cooperation strategy has been shown to be evident in sticklebacks. In addition, the size of a stickleback's partner fish may also be a factor in determining what a stickleback will do when both fish are faced with a predator. Two sticklebacks simultaneously presented to a rainbow trout, a predator much larger in size, will have differing risks of being attacked. Usually, the larger of the two sticklebacks has a higher risk of being attacked.[43] Individual sticklebacks are more likely to move closer to a trout (or some other predator) when a larger potential partner moves close to the trout than when a smaller partner approaches the trout.[43] Although both large and small partners behave similarly, a small partner's behavior affects the strategy of the test fish more than that of the large partner.[43] Regardless of whether it is alone or with a partner that cooperates, a larger fish will approach a predator more closely than does a smaller fish.[43] If a partner defects, then a stickleback's condition-factor (i.e. its ability to flee) determines how closely it approaches the predator rather than the stickleback's size.[43] Both the strategy and reaction to different-sized partners seem to be dependent on whether the partner cooperates or defects.
Parasites
[edit]The three-spined stickleback is a secondary intermediate host for the hermaphroditic parasite Schistocephalus solidus, a tapeworm of fish and fish-eating birds. The tapeworm passes into sticklebacks through its first intermediate hosts, cyclopoid copepods, when these are eaten by the fish. The parasite matures into its third larval stage, the plerocercoid, in the abdomen of the stickleback. Infected sticklebacks are afterwards consumed by fish-eating birds, which serve as the tapeworm's definitive host.[44][45]
Another common parasite of the three-spined stickleback is the microsporidian Glugea anomala.[46] Naturally infections with G. anomala lose weight compared to uninfected individuals,[47] but do not cause size differences between individuals.[46] Glugea anomala also correlates behavioural changes, such as increased shoaling,[47] increased sociability and activity, and reduced boldness.[46][48] It is unknown whether these differences in behaviour are due to certain personality traits predisposing individuals to infections, or whether infections change behaviour.
Genetics
[edit]Three-spined sticklebacks have recently become a major research organism for evolutionary biologists trying to understand the genetic changes involved in adapting to new environments. The entire genome of a female fish from Bear Paw Lake in Alaska was recently sequenced by the Broad Institute and many other genetic resources are available.[49] This population is under risk from the presence of introduced northern pike in a nearby lake. Three-spined sticklebacks are also used for researching sex-specific brain gene expression. Parents exposed to predator models produced offspring with different gene expressions compared to those that were not exposed to predators. Non-overlapping genes appear highly influenced by the sex of the parent, with genes being differentially expressed in offspring based on whether the male or female parent was exposed to predation.[50]
Eco-evolutionary dynamics
[edit]Three-spined stickleback research has been central to the field of eco-evolutionary dynamics.[51][52] Eco-evolutionary dynamics is an area of study investigating how ecological processes (e.g., population dynamics, community interactions, and nutrient cycling) affect how populations evolve, and in turn, how these patterns of evolution feed back to affect ecological processes.[53][54] Importantly, these dynamics arise when substantial evolutionary change occurs on the same time scale as ecological change (i.e., less than 1,000 generations).[53][55][56] Three-spined stickleback are particularly useful for studying eco-evolutionary dynamics because multiple populations have evolved rapidly and in predictable, repeated patterns after colonizing new environments.[51][57] These repeated patterns of evolution allow scientists to assess whether the impacts of stickleback evolution on ecological processes are reproducible.
An eco-evolutionary framework has been used to explore multiple aspects of stickleback biology. Notably, this research has focused on how populations of three-spined stickleback have diverged to occupy different ecological niches (a process called adaptive radiation) and how sticklebacks have coevolved with their parasites.[51][52]
Eco-evolutionary dynamics of adaptive radiation
[edit]Most eco-evolutionary dynamics research in sticklebacks has focused on how the adaptive radiation of different ecotypes affects ecological processes.[51][52][58][59][60] Ecotypes represent genetically and morphologically recognizable populations occupying distinct ecological niches.[57][58][59][61][62] In three-spined stickleback, divergent ecotypes are often found as sympatric (i.e., co-occurring) or parapatric (i.e., partially overlapping, but mostly isolated) species pairs, including benthic—limnetic pairs,[58] freshwater—anadromous pairs,[61] and lake—stream pairs.[59][62] Pairs of stickleback ecotypes have diverged at time scales ranging from 10,000 years to only decades ago.[57][61]
Different combinations of stickleback ecotypes affect ecosystem processes in different ways. For example, the combined presence of specialized benthic and limnetic sticklebacks has a different effect on the diversity and abundance of prey species compared to the presence of only a generalist ancestral stickleback ecotype.[58] Notably, this effect appears to be driven by limnetic sticklebacks specializing on zooplankton prey, rather than by an increase in the number of co-occurring stickleback species alone.[58] The impacts of ecotype specialization on prey communities can even affect the abundance of algae and cyanobacteria that do not directly interact with sticklebacks, along with aspects of the abiotic environment,[58][59] such as the amount of ambient light available for photosynthesis[58] and levels of dissolved oxygen,[58] carbon,[60] and phosphorus.[59] These diverse changes in ecosystem processes can persist to affect natural selection on subsequent stickleback generations,[59] potentially shaping how stickleback populations will evolve in the future. Because the presence of specialist verses generalist ecotypes can impact ecosystems in a way that, in turn, affects selection on future stickleback generations, the adaptive radiation of specialized ecotypes could drive eco-evolutionary feedback loops in natural populations.[59]
Eco-evolutionary dynamics of host-parasite interactions
[edit]Sticklebacks have also been studied to investigate the eco-evolutionary dynamics of host-parasite coevolution.[63][64][65] Three-spined sticklebacks can be hosts to a variety of parasites (e.g., Schistocephalus solidus, a common tapeworm of fish and fish-eating birds[44]). The diversity of parasite species within individual stickleback is influenced by an individual's dietary niche and immune response.[65] This covariation between parasite infection and host traits is likely a consequence of eco-evolutionary feedback, whereby the evolution of dietary and parasite resistance traits in sticklebacks alters parasite reproduction and infection rates, which in turn affects parasite exposure and selection on parasite resistance in sticklebacks.[64] These feedbacks can also extend beyond stickleback-parasite interactions to modify ecosystem processes.[63] Specifically, differences in resistance and infection rates among stickleback ecotypes can alter how sticklebacks affect the abundance of prey species and levels of dissolved nutrients and oxygen.[63] These ecosystem impacts can further affect selection on sticklebacks in subsequent generations, which suggests a complex feedback loop between the evolution of host-parasite interactions, community composition, and abiotic conditions.[63]
Common methods
[edit]Many researchers have used mesocosm experiments to test how the adaptive radiation of stickleback ecotypes and stickleback-parasite interactions can impact ecological processes.[51][58][59][60][63] In these experiments, researchers simulate the natural environments of sticklebacks in enclosed tanks, including natural plant and invertebrate communities and freshwater ecological zones.[58][59][60][63] They then systematically manipulate an independent variable (e.g., which stickleback ecotypes were present or the presence of parasites), and measured differences in biotic and abiotic aspects of ecosystems among the different stickleback treatments.[52][59][60][63] In some cases, researchers have then tested for potential feedback loops between ecotype evolution and ecological change by removing the adult stickleback from the mesocosms and replacing them with juveniles of different ecotypes.[59][63] By doing so, the researchers could then measure how the effects of adult sticklebacks on their ecosystems influenced overall juvenile fitness (e.g., survival and growth rates) and differences in fitness between juveniles of different ecotypes.[59][63]
References
[edit]- ^ a b NatureServe. (2019). "Gasterosteus aculeatus". IUCN Red List of Threatened Species. 2019: e.T8951A58295405. doi:10.2305/IUCN.UK.2019-2.RLTS.T8951A58295405.en. Retrieved 28 November 2022.
- ^ Fang, Bohao; Merilä, Juha; Ribeiro, Filipe; Alexandre, Carlos M.; Momigliano, Paolo (2018). "Worldwide phylogeny of three-spined sticklebacks". Molecular Phylogenetics and Evolution. 127: 613–625. doi:10.1016/j.ympev.2018.06.008. PMID 29906607. S2CID 49231567.
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Further reading
[edit]- Wootton, R.J. 1976. The biology of the sticklebacks. Academic Press, London.
- Bell, M.A., and Foster, S.A. (eds.) 1994. The evolutionary biology of the three-spined stickleback. Oxford University Press, New York.
- Ostlund-Nilsson, S., Mayer, I., and Huntingford, F.A. (eds.) 2007. Biology of the three-spined stickleback. CRC Press, Boca Raton.
External links
[edit]- "Gasterosteus aculeatus". Integrated Taxonomic Information System. Retrieved 19 March 2006.
- The section of the Canadian Species at Risk Act dealing with the species pairs
- View the stickleback genome in Ensembl
- IUCN Red List least concern species
- Gasterosteus
- Fish of the North Pacific
- Fish of the North Atlantic
- Fish of the Great Lakes
- Freshwater fish of Europe
- Fauna of the San Francisco Bay Area
- Western North American coastal fauna
- Fauna of Atlantic Canada
- Fauna of the Northeastern United States
- Fish described in 1758
- Taxa named by Carl Linnaeus
- Fish of the Baltic Sea
- Serravallian first appearances
- Extant Miocene first appearances