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JPR Advance Access published online on June 25, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh109
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Received March 28, 2003
Accepted June 3, 2004

Article

Comparison of nets and pump sampling gears to assess zooplankton vertical distribution in stratified lakes

Stéphane Masson 1*, Bernadette Pinel-Alloul 2, Ginette Méthot 2, Nancie Richard 2

1 Groupe de Recherche Interuniversitaire en Limnologie et en Environnement Aquatique (G.R.I.L.). Département de Sciences Biologiques, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal (Québec) Canada, H3C-3J7
2 Station de Biologie des Laurentides, Université de Montréal, 440, chemin du Lac Croche St-Hippolyte, (Québec) Canada, J0R 1P0

* To whom correspondence should be addressed. E-mail: stephane_masson{at}inrs-ete.uquebec.ca.


  Abstract

The efficiency of a cantilevered bridle net was tested with a Wisconsin net and a pumping system to sample zooplankton organisms in three water layers (epi-, meta-, and hypolimnion) of three Canadian Shield lakes. The variations among samplers were compared to variations due to within-lake vertical distribution of zooplankters and among lake variations. For each lake and water layer, we also assessed the efficiency of the three methods according to the catches of zooplanktonic taxa. Highest percentages of variation were generally due to lake or water layer effects; interaction between sampling gears and water layers were above 50% for most taxa, except cladoceran. Sampling methods explained more variation than the lake effect for some zooplankton taxa indicating that using different sampling devices could potentially alter the among-lake variations interpretation in zooplankton abundance. The pumping system captured higher densities of animals per taxa than the cantilever and the Wisconsin nets. The cantilever net generally captured mobile taxa more efficiently (Polyarthra vulgaris, copepods, Daphnia sp., Diaphanosoma brachyurum, and chaoborids) than the Wisconsin net and the pumping system, but its efficiency varied among water layers.


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