Plankton net: Difference between revisions
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[[File:The upper part of plankton net.jpg|thumb|The upper part of plankton net consisting of (1) towing line connected to (2) three-point bridle, which is responsible for holding the plankton net]] |
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'''Plankton net''' is an equipment used in [[sampling method]] for collecting [[plankton]] in standing [[water body]], which includes [[zooplankton]] and [[phytoplankton]]. This equipment consists of towing line and bridles, [[nylon]] [[mesh]] net, and cod end. A plankton net is considered as one of the oldest, simplest and inexpensive method for plankton sampling.<ref name="Gutkowska">{{cite journal|last1=Gutkowska|first1=Agnieszka|last2=Paturej|first2=Ewa|last3=Kowalska|first3=Ewa|title=Qualitative and quantitative methods for sampling zooplankton in shallow coastal estuaries|journal=Ecohydrology & Hydrology|date=2012|volume=12|pages=253–263|doi=10.2478/v10104-012-0022-2|url=http://ecohydro.pl/files/archieves/2012_3/EH2012-3_252-263_Gutkowska.pdf}}</ref> The plankton net can be used in both [[vertical]] and [[horizontal]] sampling.<ref name="Gutkowska" /> The plankton net allows the researchers to observe both [[quantitative]] (cell density, cell colony or biomass) and [[qualitative]] ( e. g. Chlorophyll-a as a primary production of phytoplankton) analysis of planktons in the water sample from the environment. |
'''Plankton net''' is an equipment used in [[sampling method]] for collecting [[plankton]] in standing [[water body]], which includes [[zooplankton]] and [[phytoplankton]]. This equipment consists of towing line and bridles, [[nylon]] [[mesh]] net, and cod end. A plankton net is considered as one of the oldest, simplest and inexpensive method for plankton sampling.<ref name="Gutkowska">{{cite journal|last1=Gutkowska|first1=Agnieszka|last2=Paturej|first2=Ewa|last3=Kowalska|first3=Ewa|title=Qualitative and quantitative methods for sampling zooplankton in shallow coastal estuaries|journal=Ecohydrology & Hydrology|date=2012|volume=12|pages=253–263|doi=10.2478/v10104-012-0022-2|url=http://ecohydro.pl/files/archieves/2012_3/EH2012-3_252-263_Gutkowska.pdf}}</ref> The plankton net can be used in both [[vertical]] and [[horizontal]] sampling.<ref name="Gutkowska" /> The plankton net allows the researchers to observe both [[quantitative]] (cell density, cell colony or biomass) and [[qualitative]] ( e. g. Chlorophyll-a as a primary production of phytoplankton) analysis of planktons in the water sample from the environment. |
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Revision as of 10:56, 20 November 2016
Plankton net is an equipment used in sampling method for collecting plankton in standing water body, which includes zooplankton and phytoplankton. This equipment consists of towing line and bridles, nylon mesh net, and cod end. A plankton net is considered as one of the oldest, simplest and inexpensive method for plankton sampling.[1] The plankton net can be used in both vertical and horizontal sampling.[1] The plankton net allows the researchers to observe both quantitative (cell density, cell colony or biomass) and qualitative ( e. g. Chlorophyll-a as a primary production of phytoplankton) analysis of planktons in the water sample from the environment.
Components
The components of plankton nets could be separated into three common parts, which are towing line and bridles, nylon mesh net and cod end.
Towing line and bridles
Towing line and bridles are the upper part of the plankton net, which are responsible for holding the plankton net. The towing lines that are connected to the triangle bridles are made of nylon rope, It can be adjust to the appropriate level that is suitable for the user.
Nylon mesh net
Nylon mesh net is the middle part of the plankton net component, which can be used to filter the plankton in the water sample according to the size of the mesh net. In addition its funnel shape provide more possibility for the net to narrow down and catch the plankton net in varied size more effectively.[2] There are various size of the mesh net varied by the target types of the microorganism that the researcher wants to collect and the condition of the water body. The narrower the mesh size is, the size of the plankton in the water sample would be smaller.
For example, in order to receive the small invertebrates, which has the size of 50 to 1500 μm, the net mesh size that the researcher should select is the mesh size between 25 to 50 μm diameter, which is sufficient to effectively filter only the target organism.[3] However, if the water condition is in eutrophic, the research suppose to use the plankton net with the size of greater than 100 μm to avoid clogging inside the net.
Cod end
Cod end is located in the lower part of the plankton net or at its end of the funnel. This part is responsible for collecting the plankton sample, as there is a collecting cylinder appearing in this part. Nearby the cylinder, there is a valve for opening and closing the cod end.
References
- ^ a b Gutkowska, Agnieszka; Paturej, Ewa; Kowalska, Ewa (2012). "Qualitative and quantitative methods for sampling zooplankton in shallow coastal estuaries" (PDF). Ecohydrology & Hydrology. 12: 253–263. doi:10.2478/v10104-012-0022-2.
- ^ Office of Marine Programs. "Plankton nets". Census of Marine Life. University of Rhode Island.
- ^ Valdecasas, Antonio G.; Aboal, Marina; Cirujano, Santos; Iepure, Sanda; Jaume, Damia; Proctor, Heather; Velasco, Jose Luis. "Sampling continental freshwater" (PDF). The Mediterranean Institute for Advanced Studies (IMEDEA).