Zoobenthos communities and their seasonal dynamics in nonfreezing springs of Baikal region

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-w...

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Bibliographic Details
Published in:Biology bulletin of the Russian Academy of Sciences 2010-12, Vol.37 (6), p.638-646
Main Authors: Takhteev, V. V, Galimzyanova, A. V, Ambrosova, E. V, Kravtsova, L. S, Rozhkova, N. A, Okuneva, G. L, Semernoi, V. P, Pomazkova, G. I, Lopatovskaya, O. G
Format: Article
Language:English
Subjects:
Abundance
Biochemistry
Biomass
Biomedical and Life Sciences
Cell Biology
crenobionts
Ecology
fauna
Lakes
Life Sciences
Oligochaeta
seasonal dynamics
Seasonal variations
springs
stygobionts
Water springs
Water temperature
Zoobenthos
Zoology
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Summary: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.
ISSN:1062-3590
1608-3059
DOI:10.1134/S1062359010060129