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Grazing rate and feeding selectivity of small and large bodied cladocerans in waters from lakes with different salinity and phytoplankton structure

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Journal of Oceanology and Limnology 2023年第4期41卷 1341-1351页

作者： Egor ZADEREEV Tatiana LOPATINA svyatoslav ovchinnikov Alexander TOLOMEEV Institute of Biophysics Krasnoyarsk Research CenterSiberian Branch of Russian Academy of SciencesAkademgorodokKrasnoyarsk 660036Russia Siberian Federal University Krasnoyarsk 660041Russia

Cladocera are filter feeders abundant in freshwaters,which consume phytoplankton particles in wide size and taxonomic *** ability of cladocerans to control phytoplankton abundance by grazing is determined by various factors including the characteristics of *** salinization may reduce the strength of top-down grazing control of phytoplankton because of the detrimental effects of salinity on the grazing intensity of *** performed grazing experiments with two species of Cladocera of different body lengths to test their ability to graze on phytoplankton in natural waters differing in salinity and size and taxonomic composition of food *** experiments demonstrated that the grazing rate was mostly controlled by the abundance of phytoplankton in the *** grazing rate was reduced at salinity *** 3 g/L of NaCl in the *** lower grazing rate was observed in the medium with larger phytoplankton *** species predominantly consumed phytoplankton particles with a diameter of 6-12μm,which may shift the size distribution of phytoplankton towards a larger average diameter of *** taxon-specific feeding was also observed,as both species predominantly consumed diatom ***,we found that because of grazing,the size and taxonomic characteristics of phytoplankton are shifted towards a less edible *** detrimental effect of elevated salinity on grazing rate supports growing concern about freshwater salinization negatively affecting water quality,particularly reducing top-down grazing control of phytoplankton.

关键词： selective feeding Daphnia Moina top-down control phytoplankton salinity

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