Original scientific paper

EUTROPHICATION IMPACT ON ZOOPLANKTON COMMUNITY: A SHALLOW LAKE APPROACH

Maria Špoljar orcid.org/0000-0003-1006-8300 ; Faculty of Science, University of Zagreb, Croatia
Tea Tomljanović orcid.org/0000-0002-5917-3315 ; Faculty of Agriculture, University of Zagreb, Croatia
Ivana Lalić ; Ministry of Environmental Protection, Physical Planning and Construction, Zagreb, Croatia

Abstract

Zooplankton communities were investigated in a turbid shallow lake with an aim to analyze (i) relationships between ecological conditions and the communities and (ii) trophic state inferred from abiotic and biotic indicators. According to results emerged littoral vegetated zone increased diversity (30 taxa) in comparison to the pelagial (17 taxa). Rotifers dominated in terms of diversity and abundance in littoral and pelagial, 15 and 27 taxa, 58 and 71%, respectively. Thus, they were chosen for approximation of the system trophic level according to their feeding preferences exhibited as guild ratio. Mean guild ratios in littoral (– 0.36) and pelagial (– 0.31) suggested the prevalence of microfagous rotifers. They fed mostly on bacteria and detritus suspension, thus together with environmental parameters indicated high trophic level of the lake. It is supposed that turbidity resulted from anthropogenic eutrophication has affected biocoenosis assemblage, not only zooplankton but also the primary producers and the fishes.

Keywords

transparency/turbidity; vegetation; trophic state; zooplankton

Hrčak ID:

75484

URI

https://hrcak.srce.hr/75484

Publication date:

29.12.2011.

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