Dynamics of quantitative indicators of macrozoobenthos depending on changes in water level in the Maloe More Strait of Lake Baikal
E.B. GOVORUKHINA, G.P. SAFRONOV, V.P. SAMUSENOK, A.L. YURIEV, E.A. MISHARINA, I.O. BATRANINA, A.N. MATVEEV
Irkutsk State University, Irkutsk, Russia
Keywords: littoral zone, bottom invertebrates, vertical distribution, biomass of zoobenthos, environmental conditions
Abstract
An analysis is made of the results from investigating the composition, production indicators and the distribution of macrozoobenthos in the Maloe More Strait of Lake Baikal for different years (1936-1941, 1951-1952, 2008, and 2014) covering a period longer than 70 years. The composition of macrozoobenthos showed the presence of representatives of the following groups: Hydroidea, Turbellaria, Nematoda, Hirudinea, Polychaeta, Oligochaeta, Isopoda, Amphipoda, Gastropoda, Bivalvia, Chironomidae, Trichoptera, Ostracoda, Bathynellidae, and Acariformes. A clearly pronounced azonality of the vertical distribution of benthic invertebrates is described, which is caused by the nature of the deep horizons, bottom sediments, and the development of benthic vegetation. Differences were revealed in the occurrence of macrozoobenthos on the northwestern and southeastern slopes of the bed of the Maloe More Strait. The study revealed a correlation between the biomass indicators of macrozoobenthos and changes in the Lake Baikal level as observed during the period under investigation.
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