Zoobenthos communities and their seasonal dynamics in nonfreezing springs of Baikal region |
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Authors: | V V Takhteev A V Galimzyanova E V Ambrosova L S Kravtsova N A Rozhkova G L Okuneva V P Semernoi G I Pomazkova O G Lopatovskaya |
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Institution: | 1.Irkutsk State University,Irkutsk,Russia;2.Limnological Institute, Siberian Branch,Russian Academy of Sciences,Irkutsk,Russia;3.Yaroslavl State University,Yaroslavl,Russia |
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Abstract: | The faunal composition, structure of the zoobenthos communities, and seasonal changes in two springs in the south of Irkutsk
area are investigated. Both springs have the water temperature 4–5°C all year round. The fauna consists of widely distributed
hydrobionts, crenobionts, stygobionts, and near-water organisms. Arctic relicts and elements of the Lake Baikal fauna are
found. In macroinvertebrate communities, chironomid larvae dominate (by abundance and biomass), as do oligochaetes (by abundance).
The lowest quantitative parameters are recorded in autumn-winter, and the highest parameters, in spring (March–April). Then
they abruptly decline owing to emergence of amphibiotic insects. The structure of spring communities has regional specificity.
By biomass of macrozoobenthos, the springs are comparable with mesotrophic and even eutrophic lakes. |
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