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Journal of Plankton Research, Vol 21, 1231-1248, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Zooplankton distribution in flowing waters and its implications for sampling: case studies in the River Meuse (Belgium) and the River Moselle (France, Luxembourg)

L Viroux
Facultés Universitaires Notre-Dame de la Paix, URBO - Unit of Freshwater Ecology, rue de Bruxelles 61, B-5000 Namur, Belgium

Zooplankton spatial distribution was studied on four occasions by transect sampling on the rivers Moselle and Meuse in July 1996. Sampling sites were selected for their variety in morphology. A pseudoreplicate-based sampling scheme was adopted that allowed small-scale longitudinal variations in density to be tested along with transversal position and depth. In the Moselle, zooplankton were unevenly distributed transversally, an observation tentatively linked with the complexity of the river channel and the influence of tributaries. In the Meuse, spatial heterogeneity was stronger, and depth also played a key role. Its effect was different for rotifers and microcrustaceans. The occurrence of zooplankton patches, similar to those commonly reported from lakes, was noted. The factors leading to the establishment of such distribution patterns, and their relevance to routine sampling, are briefly discussed; a short list of recommendations for sampling in large rivers is proposed.
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