Abstract
The diurnal dynamics of the vertical distribution of zooplankton was studied in an oligotrophic lake with a high water transparency. Those sedentary species which occupy the upper water layers in waterbodies with low water transparency shift to a border between epy- and metalimnion and stay there during most of the day in Koskovskoye Lake, which has a high water transparency. Active diurnal vertical migrations are characteristic of large organisms. Increased water transparency weakly affects large zooplankters that occupy metalimnial layers in mesotrophic waterbodies. The relationship between the zooplankton’s vertical distribution and the distribution of phytoplankton and fish is analyzed.
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