The Influence of Bird Colonies on the Zooplankton
in the Rybinsk Reservoir Overgrown Shallows

A. V. Krylov^a, D. V. Kulakov^b, N. A. Kasyanov^a, O. L. Tselmovich^a, and V. G. Papchenkov^a

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

e-mail: krylov@ibiw.yaroslavl.ru

^bCherepovets State University, Sovetskii pr. 8, Cherepovets, Vologoda oblast, 162600 Russia

e-mail: dvkulakov@mail.ru

Received October 29, 2007

Abstract—This article describes the peculiarities of the structural organization of zooplankton influenced by
the waste products of the black-headed gull (Larus ridibundus Linnaeus) nesting colony in the protected over-
grown shallow in Rybinsk Reservoir. The bird colony facilitates a modification of the zooplankton structure that
is similar to the modifications of communities at early stages of eutrophication: the number of invertebrate spe-
cies increases thanks to rotifers and cladocerans and the number and biomass of community increases due to
cladocerans and copepods.

Key words: zooplancton, shallows, black headed gull, zoogenic factor.

DOI:10.1134/S1995082909020084

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