S. M. Shafigullina
Institute of Ecology of Natural Systems, Academy of Sciences of Tatarstan,
ul. Daurskaya 28, Kazan, 420087 Tatarstan, Russia;
e-mail: shafigullina@rambler.ru
Received June 4, 2007
Abstract—Interannual changes in geobiont and chortobiont abundance on the islands of Kuibyshev Reservoir
are largely determined by flood conditions, because the seasonal average abundance of many taxa is negatively
correlated to the water level in May and June. Floods influence the abundance of these animals both directly
and indirectly, through biocenotic connections and some aspects of behavior. Long-term positive trends are
observed in the abundance of many species. The hypothesis is proposed that this increase in the abundance of
geobionts and chortobionts is a consequence of adaptation processes in these communities, which are stimu-
lated by the flood regime of the reservoir.
DOI: 10.1134/S1067413609030126
Key words: geobionts, chortobionts, population density, long-term dynamics, adaptation, floods, Kuibyshev
Reservoir, islands.
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