Diurnal Dynamics of the Vertical Distribution of Zooplankton
in an Oligotrophic Lake

A. E. Dobrynin

Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Yaroslavl oblast, 152742 Russia

e-mail: ad@ibiw.yaroslavl.ru

Received January 28, 2008

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 charac-
teristic of large organisms. Increased water transparency weakly affects large zooplankters that occupy metal-
imnial layers in mesotrophic waterbodies. The relationship between the zooplankton’s vertical distribution and
the distribution of phytoplankton and fish is analyzed.

Key words: zooplankton, vertical distribution, oligrotrophic waterbody, transparency.

DOI:10.1134/S1995082909020096

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