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JPR Advance Access originally published online on November 14, 2007
Journal of Plankton Research 2008 30(1):33-42; doi:10.1093/plankt/fbm086
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Interactions between phytoplankton and zooplankton in the hypertrophic Swarzedzkie Lake in western Poland

Ryszard Goldyn* and Katarzyna Kowalczewska-Madura

Department of Water Protection, Adam Mickiewicz University, Umultowska 89, PoznaN 61-614, Poland

* CORRESPONDING AUTHOR: rgold{at}amu.edu.pl

Received on June 19, 2007; accepted on November 6, 2007


  Abstract

The hypertrophic Swarzedzkie Lake, Poland, is characterized by high species diversity, abundance and biomass of both phytoplankton and zooplankton (up to 99.5 mg WW L–1 and 817.75 µg DW L–1, respectively). The community grazing rate calculated with the use of two empirical models, and based on herbivorous crustaceans, peaked in spring and early autumn up to 150.6% of water filtered per day, and was the lowest during winter. Simple statistics revealed a positive correlation between zooplankton biomass and chlorophyll a concentration (r = 0.404, P = 0.033) and between zooplankton abundance and phytoplankton biomass (r = 0.42, P = 0.028). Canonical statistics indicated, however, that the relationship exists only with size groups and/or living forms of a few taxonomical groups of phytoplankton. Redundancy analysis (RDA) confirmed a positive influence of the community grazing rate on micro- and nanoplanktonic Cryptophyceae, but not on the microplanktonic Cyanobacteria, as was suggested by canonical correlation analysis. RDA also indicated a weak negative influence on nanoplanktonic Euglenophyceae and Chlorophyceae exerted by filtering crustaceans. Some taxonomically diverse flagellated nanoplanktonic algae were grazing sensitive, whereas microplanktonic cryptophytes and coenobial green algae were significantly grazing resistant.

Communicating editor: K.J. Flynn


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