Jump to content

Apodemia mormo: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
Emilykh26 (talk | contribs)
82 edits
cited conservation statuses
Emilykh26 (talk | contribs)
82 edits
moved page edits into official wikipedia page from sandbox. removed old text, which has now been better incorporated into the page as a whole. Preserved references that were still applicable. Old text will be moved to talk page for now
Line 1: Line 1:
⚫
{{italictitle}}
{{Taxobox
{{Taxobox
| name = Mormon metalmark
| name = Mormon metalmark
Line 13: Line 12:
| binomial = ''Apodemia mormo''
| binomial = ''Apodemia mormo''
| binomial_authority = ([[Baron Cajetan von Felder|Felder]] & [[Rudolf Felder|Felder]], 1859)
| binomial_authority = ([[Baron Cajetan von Felder|Felder]] & [[Rudolf Felder|Felder]], 1859)
| status = Saskatchewan Population: Threatened
| status = Saskatchewan Population: Threatened<ref>{{cite journal|last1=COSEWIC|title=COSEWIC assessment and update status report on the Mormon metalmark (Apodemia mormo) southern mountain population and prairie population in Canada|journal=Committee on the Status of Endangered Wildlife in Canada|date=2003}}</ref>
British Columbia Population: Endangered
British Columbia Population: Endangered<ref>{{cite journal|last1=COSEWIC|title=COSEWIC assessment and update status report on the Mormon metalmark (Apodemia mormo) southern mountain population and prairie population in Canada|journal=Committee on the Status of Endangered Wildlife in Canada|date=2003}}</ref>
Lange's Metalmark: Endangered
Lange's Metalmark: Endangered<ref>{{cite journal|last1=Powell|first1=Jerry A.|last2=Parker|first2=Michael W.|title=Lange's metalmark: Apodemia mormo langei comstock|journal=Conservation biology of lycaenidae (butterflies)|date=1993|page=116-119}}</ref>
| tribus = [[Emesini]]
| tribus = [[Emesini]]
| synonyms={{Species list
| synonyms={{Species list
Line 23: Line 22:


| Tribe = [[Emesini]]
| Tribe = [[Emesini]]
}}''Apodemia mormo'', commonly known as the Mormon Metalmark, is a principally [[Nearctic realm|Neartic]] butterfly in the family ''[[Riodinidae]]''.  It is a particularly fascinating species for ecological and evolutionary research, as evidenced by its shifting [[Taxonomy (biology)|taxonomic]] classifications.  Conflicting observations of host plants utilized, distinctive morphologies, and a wide range of occupied habitats have prompted investigation into several potential subspecies.<ref name=":0">{{Cite journal|last=COSEWIC|first=|date=2003|title=COSEWIC assessment and update status report on the Mormon metalmark (Apodemia mormo) southern mountain and prairie populations in Canada|url=|journal=Committee on the Status of Endangered Wildlife in Canada|volume=|pages=|via=}}</ref> To date, two [[Genetics|genetic]] studies have been done on ''A. mormo'', with analysis revealing that disjunct populations are genetically and [[Phenotype|phenotypically]] distinct.  These studies support a potential need for refined taxonomies, although a larger body of data is required to make clear decisions.<ref name=":3">{{Cite journal|last=Crawford|first=Lindsay A.|last2=Desjardins|first2=Sylvie|last3=Keyghobadi|first3=Nusha|date=2011|title=Fine-scale genetic structure of an endangered population of the Mormon metalmark butterfly (Apodemia mormo) revealed using AFLPs|url=|journal=Conservation genetics|volume=12.4|pages=991-1001|via=}}</ref><ref name=":1">{{Cite journal|last=Proshek|first=Benjamin, et al.|date=2013|title=Apodemia mormo in Canada: population genetic data support prior conservation ranking|url=|journal=Journal of Insect Conservation|volume=17.1|pages=155-170|via=}}</ref>Populations of ''A. mormo'' are widely distributed throughout western United States, with peripheral colonies located in [[Canada]] and [[Mexico]].  The Canadian populations have historically lacked scientific study, prompting a series of investigations in the past decade.  ''A. mormo'' is particularly interesting to Canada as the only representative of the family ''Riodinidae'', a primarily [[Neotropical realm|Neotropic]] family consisting of 1500 species.<ref name=":0" />
}}


Three populations of ''A. mormo'' have been given conservation statuses: the [[Saskatchewan]] population is listed as threatened, while both the [[British Columbia]] and Comstock Lange populations are classified as endangered.<ref name=":0" /><ref name=":2">{{Cite journal|last=Powell|first=Jerry A.|last2=Parker|first2=Michael W.|date=1993|title=Lange's metalmark: Apodemia mormo langei comstock|url=|journal=Conservation Biology of Lycaenidae (Butterflies)|volume=|pages=116-119|via=}}</ref> [[Conservation biology|Conservation]] efforts are complicated by a dependency on human activity for habitat success.  Soil disturbances, caused by human and railway traffic, are critical for the survival of host plants and subsequent ''A. mormo'' populations; however, overbearing human presence can lead to habitat destruction. Conservation statuses have been repeatedly defended by research, and recovery strategies developed in response.<ref name=":0" />         
'''''Apodemia mormo''''', the '''Mormon metalmark''', is a species of [[Apodemia|metalmark]] butterfly (family [[Riodinidae]]). Its upperside is orange-brown to black, checkered with black and white spots. Its [[caterpillar]] host is various species of ''[[Eriogonum]]'' (wild buckwheat). Its adult food is nectar from the flowers of ''Eriogonum'' and other plants, especially yellow-flowered [[Asteraceae|composites]], such as ''[[Senecio]]'' and ''[[Chrysothamnus]]'' (rabbitbrush).


== Geographic Range ==
Its range is southern [[British Columbia]] and [[Saskatchewan]], [[North Dakota]] to [[Washington (U.S. state)|Washington]], south to [[Southern California]], [[Arizona]], [[New Mexico]], and [[Mexico]].
''Apodemia mormo'' constitutes the widest ranging North American species of the family ''Riodinidae.'' Populations of ''A. mormo'' span western North America, ranging from Sinola, Mexico to Southwestern Canada, and are found west of [[North Dakota]] primarily in [[California]], [[Utah]], [[Arizona]], [[New Mexico]], and [[Washington (state)|Washington]].  While there are several populations recognized in the US, only two are present in Canada: the British Columbia population, along the Similkameen River Valley, and the Saskatchewan population, in the [[Grasslands National Park]].  The Canadian populations are listed with conservation statuses of “endangered” and “threatened”, respectively.<ref name=":0" /><ref name=":4">{{Cite journal|last=Wick|first=Ashely Anne, et al.|date=2014|title=Microhabitat Use in a Northern Peripheral Population of Apodemia mormo: Factors Beyond the Host Plant|url=|journal=Journal of the Lepidopterists' Society|volume=68.1|pages=54-60|via=}}</ref>  Rather than a continuous distribution, ''A. mormo'' colonies occur in semi-isolated patches. Population studies have found that small amounts of geographic distance between colonies (15-20 km) are significant to hinder [[gene flow]], and render populations phenotypically distinct.<ref name=":1" /><ref name=":2" /> Thus, there is great within species variation depending on geographic location, and taxonomic distinctions are still in flux.


== Habitat ==
Lange's metalmark, ''[[Apodemia mormo langei]]'', is an [[endangered]] [[subspecies]]. It only occurs in and around the [[Antioch Dunes National Wildlife Refuge]] in [[California]].
Populations of ''Apodemia mormo'' primarily occupy dry, arid habitats that support a high density of their larval host plant, various species buckwheat (''[[Eriogonum]]). '' Since ''A. mormo'' is singularly dependent on ''Eriogonum'' during the larval stage, its presence is the most stable predictor of habitat.'' '' Dunes, sloping hillsides, grasslands and gravelly deserts have all been observed as viable environments for ''A. mormo'' habitats, indicating the species’ broad adaptability.  More specifically, Wick investigated microhabitat characteristics associated with ''A. mormo'' inhabitance, and found “host plant habitat[s] with lower elevation, a southerly to southwesterly aspect, lower available soil nitrogen, a steeper slope, higher % bare ground, and higher soil pH”<ref name=":4" /> were most often correlated with presence of ''A. mormo''. 


They exact variety of buckwheat which functions as the larval host plant changes with the population being studied.  ''E. paucifllorum'', commonly known as the branched umbrella plant, is closely associated with the Saskatchewan population.  In British Columbia, ''[[Eriogonum niveum]]'' functions as the larval host plant, while in the population of ''A. m. langei'', ''[[Eriogonum nudum]]'' serves as the primary host and food source.<ref name=":3" /><ref name=":2" /> ''A. mormo'' colonies have additionally been correlated with the presence of several other plants.  In the Saskatchewan population, presence of [[Ericameria nauseosa|Ericamerica nauseosa]] (rabbitbrush) is a good predictor of ''A. mormo'' presence, and functions as a secondary nectar source.  Furthermore, Wick investigated the possibility of complex dependencies with other observed habitat plants, including “creeping juniper, yellow umbrella plant, saltbush, prickly pear cactus, Colorado rubberweed, yellow sweet clover, wild rose and sage”.<ref name=":4" />
Other subspecies of the ''mormo'' complex with limited ranges include ''nigrescens'' ([[Colton, California|Colton]], Riverside Co., California);<ref>T. Emmel, ed., ''Systematics of Western North American Butterflies'', (1998), pp. 796-8.</ref> ''arenaria'' (sand dunes near [[LAX]], Playa del Rey, LA Co., California);<ref>''Systematics'', pp. 806-7.</ref> and ''pratti'' ([[Holcomb Valley]], north of [[Big Bear Lake]], San Bernardino Co., California).<ref>''Systematics'', pp. 795-6.</ref>

Interestingly, some level of human interaction with ''A. mormo'' habitats is thought to be crucial for their success.  In the Canadian populations, specifically, human railway traffic through habitat corridors provides frequent disturbances to the soil, nurturing the growth of their larval hostplant.  To similar effect, steep and unstable slopes prone to frequent erosion provide appropriate conditions for host plant prosperity.  ''A. mormo'' are rarely found on undisturbed flats.<ref name=":0" />   

== Food Resources ==

=== Caterpillars ===
In general, species of ''Eriogonum'' serve as larval host plants for ''A. mormo''.  In the Saskatchewan population, ''Eriogonum niveum'', or snow buckwheat, functions as the primary host plant and food resource.  In the British Columbia population, the branched umbrella plant ''Eriogonum pauciflorum'' solely fulfills this role.<ref name=":3" /><ref name=":4" /><ref name=":0" /> These species flourish with adequate soil disturbances, thus only those on rocky hillsides tend to bloom and attract ''A. mormo''.<ref name=":0" />      ''  ''

=== Adults ===
''Eriogonum pauciflorum'' doubles as the primary nectar source for adult Mormon Metalmarks; however, rabbitbrush (''Ericameria nauseosus'') is often used as a secondary nectar source.<ref name=":4" />  ''A. mormo'' preferentially visit branched umbrella plants, and have only been observed visiting rabbitbrush once ''Eriogonum pauciflorum'' flowers are in decay.<ref name=":0" />

== Oviposition ==
Differing observations have been made regarding the oviposition behavior of ''Apodemia mormo''.  In California, Powell reports ''A. m. langei'' ovipositing on deteriorating, lower leaves of the ''Eriogonum'', typically in groups of 2-4 eggs.<ref name=":2" />  However, in the Canadian populations, Wick observes entirely different behavior.  The specimens of ''A. mormo'' were seen laying eggs near their host plants, but not directly on the leaves.  Instead, females oviposited in rocky crevices or soil cracks. Furthermore, only one egg was produced. The behavior occurred in the afternoon, with a duration of up to 30 seconds.<ref name=":5">Wick, Ashley Anne, et al. "First observations of Mormon Metalmark (Apodemia mormo) oviposition behaviour in Canada." ''The Canadian Field-Naturalist'' 126.1 (2012): 34-37.</ref>     Temperature differentials between Southern California and Canada may help to explain these observed differences.  Since exposure to sunlight supports increased survival in cold habitats, laying eggs on exposed rocky surfaces could be an adaptive advantage in the Canadian populations.<ref name=":5" /><ref>Bonebrake, T. C., C. L. Boggs, J. M. McNally, J. Ranganathan, and P. R. Ehrlich. 2010. Oviposition behaviour and offspring performance in herbivorous insects: consequences of climatic and habitat heterogeneity. Oikos 119: 927-934.</ref><ref>Bryant, S. R., C. D. Thomas, and J. S. Bale. 2002. The influence of thermal ecology on the distribution of three nym phalid butterflies. Journal of Applied Ecology 39: 43-55.</ref> Regardless, these populations still require ovipositing nearby suitably mature host plants, since the larvae will require adequate protection and nutrients once hatched.<ref name=":0" />   

== Life Cycle ==

=== Egg ===
Eggs are laid by adult females in clusters ranging from 1-4, depending on the specific population being observed.  In Canadian populations, Scott reported the eggs as resembling “flattened spheres”, and described their color as “pink turning purple”.<ref name=":2" /><ref name=":6">Scott, J.A. 1986. The butterflies of North America: A natural history and field guide. Stanford University Press, Stanford. 581 pp.</ref>  In contrast, Wick observed “amber coloured” eggs the size of a “pinhead” in the Saskatchewan population. Egg development is potentially dependent on habitat choice, temperature, and exposure to solar radiation, and needs further study with regards to ''A. mormo''.<ref name=":5" />   

=== Caterpillar ===
Larvae emerge from eggs during the winter, and are thought to remain at a single host plant during this stage of their lives.  Early instar larvae hibernate following their eclosion.  From June to July, the late instar larvae feed nocturnally on the leaves of their host plants, which are various species of buckwheat, depending on the population under study.  During the day, larvae can be found resting in nests made of leaf debris and silk at the base of the plant.<ref name=":2" /><ref name=":0" />  

=== Pupa ===
Pupation takes place by between July and August, with “hairy…mottled brown” pupas congregated in leaf litter underneath the host plant.<ref name=":6" /><ref name=":2" /><ref name=":0" />  

=== Adult ===
Adult emergence occurs spread out over the course of a month, with males preceding females by a few days. These mature butterflies live between nine and twelve days, with females having a slightly longer lifespan than males. During this time, ''A. mormo'' prefer to stay near to their host plant, travelling short distances of up to 50 m.  Again, there is a slight distinction between sexes, with females tending to fly farther than males.  Both males and females forage for nectar.<ref name=":6" /><ref name=":2" /><ref name=":0" /> 

=== Reproduction ===
Mating occurs approximately three days into the adult lifespan.  Females seek out male partners, who wait on food plants for their arrival.  It has been postulated that females of the subspecies Langei mate multiply, because of an observed ratio of 2.6 spermatophores per female.<ref>Arnold, R.A. and J.A. Powell 1983. Apodemia mormo langei. Ch. 6 in Ecological studies of six endangered butterflies (Lepidoptera, Lycaenidae): Island biogeography, patch dynamics and design of habitat preserves. Univ. Cal. Publ. Entomol. 99:1-161.</ref><ref name=":6" /><ref name=":0" />   

== Genetics ==

=== Population Genetics ===
The proper taxonomic classifications for ''Apodemia mormo'' are still under debate.  Because the species tends to occur in small, isolated populations, the relatedness between populations is frequently questioned.  A population genetics study conducted by Proshek revealed that the British Columbia and Saskatchewan populations of ''A. mormo'' in Canada are genetically distinct; furthermore, they uncovered higher genetic diversity in eastern vs. western populations, emphasizing low diversity in the British Columbia population.<ref name=":1" />  A second genetic study using AFLPs supports low genetic diversity in British Columbia population, and reports high spatial genetic structure and limited gene flow between populations.<ref name=":3" />  Furthermore, they found genetic similarities between the Saskatchewan population and more eastern populations. The combined results of these two studies indicate potentials for current migration activities, as well as high genetic drift.<ref name=":1" /><ref name=":3" /> In addition to genetic evidence, morphological and behavioral data are required to make firm taxonomic distinctions; however, genetic investigation has begun to reveal some of the challenges of classification.

=== Subspecies ===
There are at least twenty named subspecies of ''A. mormo.''<ref name=":6" /><ref name=":0" /> Below is a partial list of recognized subspecies:
# ''A. m. langei''<ref name=":2" />
# ''A. m. pueblo''<ref>Scott, J. A. and M. S. Fisher 1998. New Western North American butterflies. Papilio (New Series) 11:1-12.</ref>'' ''
# ''A. m. mejicanus''<ref name=":6" /> 
# ''A. m. nigrescens''<ref>T. Emmel, ed., ''Systematics of Western North American Butterflies'', (1998), pp. 796-8</ref>
# ''A. m. arenaria''<ref>''Systematics'', pp. 806-7</ref>
# ''A. m. pratti''<ref>''Systematics'', pp. 795-6</ref>

== Physiology == 
''A. mormo'' populations exhibit significant morphological variation, and therefore no singular description is a perfect fit for the species.<ref>POWELL, J.A. 1975. Riodinidae. The Metalmarks. pp. 259–272. In: Howe, W.H. (Ed.). The Butterflies of North America. Doubleday; Garden City, New York.</ref>  In general, the butterfly has a wingspan of 25-35 mm, with males being slightly smaller than females.  Females are further differentiated from males by their number of functional legs; females possess three pairs, while males do not utilize their shortened forelegs and thus only have two.  The Canadian populations have been described as having white checked dark brown wings, a gray body, green eyes, and black and white banded antennae.  There is a reddish tint towards the base of the forewings, and the ventral side of the wings are gray.<ref name=":0" /> 

=== Flight ===
Both the Canadian populations and the endangered ''A. m. langei'' are univoltine, meaning they have one generation annually. Following emergence, ''A. mormo'' adults have a flight period of roughly thirty days, with specific timing ranging from mid-July into September.<ref name=":4" /><ref>Guppy, C.S., J.H. Shepard and N.G. Kondla. 1994. Butterflies and skippers of conservation concern in British Columbia. Canadian Field-Naturalist 108:31-40.</ref><ref name=":2" /> They reach their highest concentration two weeks after the first adult emerges, usually during August.  Adults do not fly long distances, and display mostly sedentary behaviors.  The primary purposes for flight include foraging for nectar on nearby plants, and seeking out mates.  Their flight pattern can be characterized as short, linear and fast.<ref name=":2" /><ref name=":0" /> 

== Conservation ==

=== Status ===
Low genetic diversity, small, distinctive populations, semi-isolated geographic distribution, and habitat dependence all predispose ''A. mormo'' to risk of extinction and warrant conservation efforts.  In particular, Canadian populations are perceived as especially vulnerable to stochastic events, such as natural disasters, climate change, and outbreaks of disease.  Conservation efforts have been in effect for the Canadian populations since the early 2000s under COSEWIC<ref name=":0" />, and for ''A. m. langei'' since 1976 under the US Federal Endangered Species Act<ref name=":2" />.   

=== Habitat Loss ===
A key concern for conservationists is potential habitat loss.  Urban development, agricultural expansion, ranching practices, and campground activities may be responsible for disturbing natural habitats and breaking them up into small patches.  While efforts to prevent such fragmentation are encouraged, Crawford emphasizes a need to conserve even small habitat zones, which may function as bridges between sub-populations.<ref name=":3" /> <ref name=":7">Pruss, S. D., et al. "Recovery strategy for the Mormon Metalmark (Apodemia mormo) Prairie population." ''Canada species at risk act. Recovery strategy series, parks Canada agency, Ottawa''(2008).</ref>  Furthermore, habitat loss might result from invasive, competitive plant species.  ''A. mormo'' populations would severely suffer if these intruders successfully outcompete local ''Eriogonum'' species, given their dependency on the host plant.<ref name=":7" /><ref>Keeler, M. S., F. S. C. Chew, B. C. Goodale and J. M. Reed. 2006. Modelling the impacts of two exotic invasive species on a native butterfly: top-down vs. bottom-up effects. Journal of Animal Ecology 75: 777-788.</ref> Finally, ''Eriogonum'' plants go into senescence after 10-15 years.  This poses a significant problem for habitat maintenance, and suggests a need for regular dispersal of new ''Eriogonum'' plants as part of conservation efforts.<ref name=":2" />

=== Recovery Strategies ===
Recovery strategies are consistently developed and updated as new research emerges.  Regarding the Lange population in California, efforts to clear weedy vegetation and recreate mounds of sand and soil were started in 1991. ''Erigonum'' species were seeded through the habitats and the land was completely fenced in, preventing destructive human presence.<ref name=":2" />  With respect to the Canadian populations, Crawford suggests the development of strategies which recover habitat patches, regardless of size, and encourage gene flow between isolated populations.<ref name=":3" />


==References==
==References==
⚫
<references />{{italictitle}}
{{reflist}}


==External links==
==External links==

Revision as of 01:00, 3 October 2017

Mormon metalmark
Saskatchewan Population: Threatened

British Columbia Population: Endangered

Lange's Metalmark: Endangered
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Lepidoptera
Family:
Riodinidae
Tribe:
Emesini
Genus:
Apodemia
Species:
A. mormo
Binomial name
Apodemia mormo
(Felder & Felder, 1859)
Synonyms
  • Lemonias mormo Felder & Felder, 1859[1]

Apodemia mormo, commonly known as the Mormon Metalmark, is a principally Neartic butterfly in the family Riodinidae.  It is a particularly fascinating species for ecological and evolutionary research, as evidenced by its shifting taxonomic classifications.  Conflicting observations of host plants utilized, distinctive morphologies, and a wide range of occupied habitats have prompted investigation into several potential subspecies.[2] To date, two genetic studies have been done on A. mormo, with analysis revealing that disjunct populations are genetically and phenotypically distinct.  These studies support a potential need for refined taxonomies, although a larger body of data is required to make clear decisions.[3][4]Populations of A. mormo are widely distributed throughout western United States, with peripheral colonies located in Canada and Mexico.  The Canadian populations have historically lacked scientific study, prompting a series of investigations in the past decade.  A. mormo is particularly interesting to Canada as the only representative of the family Riodinidae, a primarily Neotropic family consisting of 1500 species.[2]

Three populations of A. mormo have been given conservation statuses: the Saskatchewan population is listed as threatened, while both the British Columbia and Comstock Lange populations are classified as endangered.[2][5] Conservation efforts are complicated by a dependency on human activity for habitat success.  Soil disturbances, caused by human and railway traffic, are critical for the survival of host plants and subsequent A. mormo populations; however, overbearing human presence can lead to habitat destruction. Conservation statuses have been repeatedly defended by research, and recovery strategies developed in response.[2]         

Geographic Range

Apodemia mormo constitutes the widest ranging North American species of the family Riodinidae. Populations of A. mormo span western North America, ranging from Sinola, Mexico to Southwestern Canada, and are found west of North Dakota primarily in California, Utah, Arizona, New Mexico, and Washington.  While there are several populations recognized in the US, only two are present in Canada: the British Columbia population, along the Similkameen River Valley, and the Saskatchewan population, in the Grasslands National Park.  The Canadian populations are listed with conservation statuses of “endangered” and “threatened”, respectively.[2][6]  Rather than a continuous distribution, A. mormo colonies occur in semi-isolated patches. Population studies have found that small amounts of geographic distance between colonies (15-20 km) are significant to hinder gene flow, and render populations phenotypically distinct.[4][5] Thus, there is great within species variation depending on geographic location, and taxonomic distinctions are still in flux.

Habitat

Populations of Apodemia mormo primarily occupy dry, arid habitats that support a high density of their larval host plant, various species buckwheat (Eriogonum).  Since A. mormo is singularly dependent on Eriogonum during the larval stage, its presence is the most stable predictor of habitat.  Dunes, sloping hillsides, grasslands and gravelly deserts have all been observed as viable environments for A. mormo habitats, indicating the species’ broad adaptability.  More specifically, Wick investigated microhabitat characteristics associated with A. mormo inhabitance, and found “host plant habitat[s] with lower elevation, a southerly to southwesterly aspect, lower available soil nitrogen, a steeper slope, higher % bare ground, and higher soil pH”[6] were most often correlated with presence of A. mormo. 

They exact variety of buckwheat which functions as the larval host plant changes with the population being studied.  E. paucifllorum, commonly known as the branched umbrella plant, is closely associated with the Saskatchewan population.  In British Columbia, Eriogonum niveum functions as the larval host plant, while in the population of A. m. langei, Eriogonum nudum serves as the primary host and food source.[3][5] A. mormo colonies have additionally been correlated with the presence of several other plants.  In the Saskatchewan population, presence of Ericamerica nauseosa (rabbitbrush) is a good predictor of A. mormo presence, and functions as a secondary nectar source.  Furthermore, Wick investigated the possibility of complex dependencies with other observed habitat plants, including “creeping juniper, yellow umbrella plant, saltbush, prickly pear cactus, Colorado rubberweed, yellow sweet clover, wild rose and sage”.[6]

Interestingly, some level of human interaction with A. mormo habitats is thought to be crucial for their success.  In the Canadian populations, specifically, human railway traffic through habitat corridors provides frequent disturbances to the soil, nurturing the growth of their larval hostplant.  To similar effect, steep and unstable slopes prone to frequent erosion provide appropriate conditions for host plant prosperity.  A. mormo are rarely found on undisturbed flats.[2]   

Food Resources

Caterpillars

In general, species of Eriogonum serve as larval host plants for A. mormo.  In the Saskatchewan population, Eriogonum niveum, or snow buckwheat, functions as the primary host plant and food resource.  In the British Columbia population, the branched umbrella plant Eriogonum pauciflorum solely fulfills this role.[3][6][2] These species flourish with adequate soil disturbances, thus only those on rocky hillsides tend to bloom and attract A. mormo.[2]        

Adults

Eriogonum pauciflorum doubles as the primary nectar source for adult Mormon Metalmarks; however, rabbitbrush (Ericameria nauseosus) is often used as a secondary nectar source.[6]  A. mormo preferentially visit branched umbrella plants, and have only been observed visiting rabbitbrush once Eriogonum pauciflorum flowers are in decay.[2]

Oviposition

Differing observations have been made regarding the oviposition behavior of Apodemia mormo.  In California, Powell reports A. m. langei ovipositing on deteriorating, lower leaves of the Eriogonum, typically in groups of 2-4 eggs.[5]  However, in the Canadian populations, Wick observes entirely different behavior.  The specimens of A. mormo were seen laying eggs near their host plants, but not directly on the leaves.  Instead, females oviposited in rocky crevices or soil cracks. Furthermore, only one egg was produced. The behavior occurred in the afternoon, with a duration of up to 30 seconds.[7]     Temperature differentials between Southern California and Canada may help to explain these observed differences.  Since exposure to sunlight supports increased survival in cold habitats, laying eggs on exposed rocky surfaces could be an adaptive advantage in the Canadian populations.[7][8][9] Regardless, these populations still require ovipositing nearby suitably mature host plants, since the larvae will require adequate protection and nutrients once hatched.[2]   

Life Cycle

Egg

Eggs are laid by adult females in clusters ranging from 1-4, depending on the specific population being observed.  In Canadian populations, Scott reported the eggs as resembling “flattened spheres”, and described their color as “pink turning purple”.[5][10]  In contrast, Wick observed “amber coloured” eggs the size of a “pinhead” in the Saskatchewan population. Egg development is potentially dependent on habitat choice, temperature, and exposure to solar radiation, and needs further study with regards to A. mormo.[7]   

Caterpillar

Larvae emerge from eggs during the winter, and are thought to remain at a single host plant during this stage of their lives.  Early instar larvae hibernate following their eclosion.  From June to July, the late instar larvae feed nocturnally on the leaves of their host plants, which are various species of buckwheat, depending on the population under study.  During the day, larvae can be found resting in nests made of leaf debris and silk at the base of the plant.[5][2]  

Pupa

Pupation takes place by between July and August, with “hairy…mottled brown” pupas congregated in leaf litter underneath the host plant.[10][5][2]  

Adult

Adult emergence occurs spread out over the course of a month, with males preceding females by a few days. These mature butterflies live between nine and twelve days, with females having a slightly longer lifespan than males. During this time, A. mormo prefer to stay near to their host plant, travelling short distances of up to 50 m.  Again, there is a slight distinction between sexes, with females tending to fly farther than males.  Both males and females forage for nectar.[10][5][2] 

Reproduction

Mating occurs approximately three days into the adult lifespan.  Females seek out male partners, who wait on food plants for their arrival.  It has been postulated that females of the subspecies Langei mate multiply, because of an observed ratio of 2.6 spermatophores per female.[11][10][2]   

Genetics

Population Genetics

The proper taxonomic classifications for Apodemia mormo are still under debate.  Because the species tends to occur in small, isolated populations, the relatedness between populations is frequently questioned.  A population genetics study conducted by Proshek revealed that the British Columbia and Saskatchewan populations of A. mormo in Canada are genetically distinct; furthermore, they uncovered higher genetic diversity in eastern vs. western populations, emphasizing low diversity in the British Columbia population.[4]  A second genetic study using AFLPs supports low genetic diversity in British Columbia population, and reports high spatial genetic structure and limited gene flow between populations.[3]  Furthermore, they found genetic similarities between the Saskatchewan population and more eastern populations. The combined results of these two studies indicate potentials for current migration activities, as well as high genetic drift.[4][3] In addition to genetic evidence, morphological and behavioral data are required to make firm taxonomic distinctions; however, genetic investigation has begun to reveal some of the challenges of classification.

Subspecies

There are at least twenty named subspecies of A. mormo.[10][2] Below is a partial list of recognized subspecies:

  1. A. m. langei[5]
  2. A. m. pueblo[12] 
  3. A. m. mejicanus[10] 
  4. A. m. nigrescens[13]
  5. A. m. arenaria[14]
  6. A. m. pratti[15]

== Physiology ==  A. mormo populations exhibit significant morphological variation, and therefore no singular description is a perfect fit for the species.[16]  In general, the butterfly has a wingspan of 25-35 mm, with males being slightly smaller than females.  Females are further differentiated from males by their number of functional legs; females possess three pairs, while males do not utilize their shortened forelegs and thus only have two.  The Canadian populations have been described as having white checked dark brown wings, a gray body, green eyes, and black and white banded antennae.  There is a reddish tint towards the base of the forewings, and the ventral side of the wings are gray.[2] 

Flight

Both the Canadian populations and the endangered A. m. langei are univoltine, meaning they have one generation annually. Following emergence, A. mormo adults have a flight period of roughly thirty days, with specific timing ranging from mid-July into September.[6][17][5] They reach their highest concentration two weeks after the first adult emerges, usually during August.  Adults do not fly long distances, and display mostly sedentary behaviors.  The primary purposes for flight include foraging for nectar on nearby plants, and seeking out mates.  Their flight pattern can be characterized as short, linear and fast.[5][2] 

Conservation

Status

Low genetic diversity, small, distinctive populations, semi-isolated geographic distribution, and habitat dependence all predispose A. mormo to risk of extinction and warrant conservation efforts.  In particular, Canadian populations are perceived as especially vulnerable to stochastic events, such as natural disasters, climate change, and outbreaks of disease.  Conservation efforts have been in effect for the Canadian populations since the early 2000s under COSEWIC[2], and for A. m. langei since 1976 under the US Federal Endangered Species Act[5].   

Habitat Loss

A key concern for conservationists is potential habitat loss.  Urban development, agricultural expansion, ranching practices, and campground activities may be responsible for disturbing natural habitats and breaking them up into small patches.  While efforts to prevent such fragmentation are encouraged, Crawford emphasizes a need to conserve even small habitat zones, which may function as bridges between sub-populations.[3] [18]  Furthermore, habitat loss might result from invasive, competitive plant species.  A. mormo populations would severely suffer if these intruders successfully outcompete local Eriogonum species, given their dependency on the host plant.[18][19] Finally, Eriogonum plants go into senescence after 10-15 years.  This poses a significant problem for habitat maintenance, and suggests a need for regular dispersal of new Eriogonum plants as part of conservation efforts.[5]

 Recovery Strategies

Recovery strategies are consistently developed and updated as new research emerges.  Regarding the Lange population in California, efforts to clear weedy vegetation and recreate mounds of sand and soil were started in 1991. Erigonum species were seeded through the habitats and the land was completely fenced in, preventing destructive human presence.[5]  With respect to the Canadian populations, Crawford suggests the development of strategies which recover habitat patches, regardless of size, and encourage gene flow between isolated populations.[3]

References

  1. ^ Felder, C.; Felder, R. (1859). "Lepidopterologische Fragmente". Wiener entomologische Monatschrift. 3: 271–272.
  2. ^ a b c d e f g h i j k l m n o p q r COSEWIC (2003). "COSEWIC assessment and update status report on the Mormon metalmark (Apodemia mormo) southern mountain and prairie populations in Canada". Committee on the Status of Endangered Wildlife in Canada.
  3. ^ a b c d e f g Crawford, Lindsay A.; Desjardins, Sylvie; Keyghobadi, Nusha (2011). "Fine-scale genetic structure of an endangered population of the Mormon metalmark butterfly (Apodemia mormo) revealed using AFLPs". Conservation genetics. 12.4: 991–1001.
  4. ^ a b c d Proshek, Benjamin; et al. (2013). "Apodemia mormo in Canada: population genetic data support prior conservation ranking". Journal of Insect Conservation. 17.1: 155–170. {{cite journal}}: Explicit use of et al. in: |first= (help)
  5. ^ a b c d e f g h i j k l m n Powell, Jerry A.; Parker, Michael W. (1993). "Lange's metalmark: Apodemia mormo langei comstock". Conservation Biology of Lycaenidae (Butterflies): 116–119.
  6. ^ a b c d e f Wick, Ashely Anne; et al. (2014). "Microhabitat Use in a Northern Peripheral Population of Apodemia mormo: Factors Beyond the Host Plant". Journal of the Lepidopterists' Society. 68.1: 54–60. {{cite journal}}: Explicit use of et al. in: |first= (help)
  7. ^ a b c Wick, Ashley Anne, et al. "First observations of Mormon Metalmark (Apodemia mormo) oviposition behaviour in Canada." The Canadian Field-Naturalist 126.1 (2012): 34-37.
  8. ^ Bonebrake, T. C., C. L. Boggs, J. M. McNally, J. Ranganathan, and P. R. Ehrlich. 2010. Oviposition behaviour and offspring performance in herbivorous insects: consequences of climatic and habitat heterogeneity. Oikos 119: 927-934.
  9. ^ Bryant, S. R., C. D. Thomas, and J. S. Bale. 2002. The influence of thermal ecology on the distribution of three nym phalid butterflies. Journal of Applied Ecology 39: 43-55.
  10. ^ a b c d e f Scott, J.A. 1986. The butterflies of North America: A natural history and field guide. Stanford University Press, Stanford. 581 pp.
  11. ^ Arnold, R.A. and J.A. Powell 1983. Apodemia mormo langei. Ch. 6 in Ecological studies of six endangered butterflies (Lepidoptera, Lycaenidae): Island biogeography, patch dynamics and design of habitat preserves. Univ. Cal. Publ. Entomol. 99:1-161.
  12. ^ Scott, J. A. and M. S. Fisher 1998. New Western North American butterflies. Papilio (New Series) 11:1-12.
  13. ^ T. Emmel, ed., Systematics of Western North American Butterflies, (1998), pp. 796-8
  14. ^ Systematics, pp. 806-7
  15. ^ Systematics, pp. 795-6
  16. ^ POWELL, J.A. 1975. Riodinidae. The Metalmarks. pp. 259–272. In: Howe, W.H. (Ed.). The Butterflies of North America. Doubleday; Garden City, New York.
  17. ^ Guppy, C.S., J.H. Shepard and N.G. Kondla. 1994. Butterflies and skippers of conservation concern in British Columbia. Canadian Field-Naturalist 108:31-40.
  18. ^ a b Pruss, S. D., et al. "Recovery strategy for the Mormon Metalmark (Apodemia mormo) Prairie population." Canada species at risk act. Recovery strategy series, parks Canada agency, Ottawa(2008).
  19. ^ Keeler, M. S., F. S. C. Chew, B. C. Goodale and J. M. Reed. 2006. Modelling the impacts of two exotic invasive species on a native butterfly: top-down vs. bottom-up effects. Journal of Animal Ecology 75: 777-788.


Stub icon

This Riodinidae-related article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=Apodemia_mormo&oldid=803520451"