Seasonal dynamics of biotic indices in uncontaminated sites of Breksa River (South-Western Altai)
Abstract
L.V. Yanygina, A.A. Evseeva, V.B. Zhuravlev
River macroinvertebrate communities are distinguished by significant seasonal and interannual dynamics associated with variability of biotic and abiotic factors of their formation. Seasonal changes in composition and structure of bottom communities can have a significant impact on bioindication results because just these indicators are used in calculations of most biotic indices. The purpose of the study is to evaluate seasonal variability of biotic indices in the background section of Breksa River. In 2006-2009, macroinvertebrates were collected every month from April to October. To assess seasonal variability, we calculated biotic indices, which are most commonly used in ecological monitoring of rivers in different countries, i.e., the biotic index of Trent River, the Biological Monitoring Working Party Index (BMWP), Average Score Per Taxon Index (ASPT), the number of stoneflies, mayflies and caddisflies species (EPT), as well as the species richness and the Shannon diversity index. The maximum variability in the uncontaminated area of Breksa River falls on species richness indices, whereas the minimum one - on ASPT and TBI, which can be considered as priority indicators of habitat quality.
Keywords: Bioindication; macroinvertebrates; seasonal dynamics; biotic indices; reference site
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