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Current issue: Volume 20, No. 1 (2020)
Brakovska A., Paidere J., Škute A. 2020. Dynamics and factors influencing zooplankton in the lakes Svente, Riča, Dridzis and Geraņimovas-Ilzas (Eastern Latvia). Acta Biol. Univ. Daugavp., 20 (1): 71 – 94.
Abstract
According to the analysis of the collected zooplankton samples the highest zooplankton species diversity was observed in lakes Dridzis and Svente. 73 zooplankton species were identified in Lake Dridzis, while 68 zooplankton species were identified in Lake Svente. In turn, 47 species were identified in Lake Riča, and 42 zooplankton species were identified in Lake Geraņimovas-Ilzas. During Spearman’s rank correlation the obtained results over the years, investigated lakes and zooplankton groups are different. Positive correlation in Lake Svente was among Asplanchna priodonta, Gastropus stylifer, Conochilus hippocrepis, Pompholux sulcata, Keratella cochlearis, Kellicottia longispina (Rotifera), Daphnia cucullata, Daphnia cristata, Bosmina crassicornis, Bosmina longispina, Chydorus ovalis (Cladocera), dissolved oxygen, Cyclops sp. and Nauplii (Copepoda). Negative correlation coefficient was obtained for Keratella quadrata, Filinia longiseta (Rotifera). Positive correlation in Lake Dridzis was among Daphnia cucullata, Daphnia cristata, Bosmina crassicornis, Bosmina longispina, Diaphanosoma brachyurum (Cladocera), Keratella cochlearis, Kellicottia longispina, Gastropus stylifer, Filinia longiseta, Conochilus unicornis (Rotifera), Megacyclops viridis, Cyclops sp. and Nauplii (Copepoda). Negative correlation coefficient was obtained for Asplanchna priodonta (Rotifera) and Eurytemora lacustris (Copepoda), it is suggested that there is negative interaction among these species. While positive correlation in Lake Geraņimovas-Ilzas was among Asplanchna priodonta, Keratella cochlearis, Pompholux sulcata (Rotifera), Daphnia cucullata, Daphnia cristata, Diaphanosoma brachyurum (Cladocera), dissolved oxygen, chlorophill α, water temperature, Eudiaptomus gracilis, Cyclops sp. and Nauplii (Copepoda), but positive correlation in Lake Riča was obtained for Keratella cochlearis (Rotifera), Daphnia cucullata (Cladocera) and Cyclops sp. (Copepoda). Negative correlation coefficient was obtained for Polyarthra major (Rotifera), Bosmina longispina (Cladocera), chlorophill α and total dissolved solids.
Key words: Zooplankton taxa, Lake Svente, Lake Riča, Lake Dridzis, Lake GeraņimovasIlzas, Spearman’s rank correlation, Shannon – Wiener species diversity index, redundancy
analysis (RDA).
Jana Paidere, Aija Brakovska, Artūrs Škute. Laboratory of Hydroecology, Department of Ecology, Institute of Life Sciences and Technologies, Daugavpils University, Daugavpils, Parādes 1a, Latvia, E-mail: jana.paidere@du.lv, aija.brakovska@inbox.lv.
