Abstract
Studies on assemblages of freshwater fishes along elevational gradients of rivers are lacking, even in Europe. In this paper we have explored the entire range of elevational gradients existing in the European part of Russia. We analyzed how fish biodiversity (species richness, abundance, diversity indices) at 435 river sites differed by elevation. The impact of elevation on the distribution of freshwater fish species was analyzed using regression and ordination methods. For the first time for a large area of Eastern Europe, optimum points and niche breadth for fish species along altitude gradients were estimated. Our analyses showed: (1) species richness and Shannon index decreased in the upper part of the gradient; fish abundance showed a unimodal response to elevation; highest numbers were found at elevations between 250 and 500 m; (2) ordination analysis demonstrated an upstream-downstream gradient of the fish assemblages; (3) regression analysis showed significant preferences for elevation by 19 species, all of which were monotonic; (4) optimum and niche breadth (tolerance) were highly variable between species; only five species (brown trout, grayling, common minnow, bullhead and stone loach) were encountered at elevations above 650 m; and (5) in our region, the habitat of grayling was higher in the mountains, and its abundance (numbers) at extreme elevations was greater, than brown trout. These results show how fish assemblages differ with elevation. Our findings identify the data that can be used for regional environmental monitoring of the state of small rivers and for aquatic conservation.
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Acknowledgements
We thank Professor Tim Sparks for revising the English of the early drafts of the manuscript. Our special thanks go to Vasilya Yanybaeva, the Director of Bashkir Nature Reserve and Rifgat Shagidullin, the Director of the Institute of Problems in Ecology and Mineral Wealth, for their irrepressible support during the field surveys.
We declare that the fish were caught under a survey permit of the Russian Federal Agency for Fisheries.
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Askeyev, A., Askeyev, O., Yanybaev, N. et al. River fish assemblages along an elevation gradient in the eastern extremity of Europe. Environ Biol Fish 100, 585–596 (2017). https://doi.org/10.1007/s10641-017-0588-z
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DOI: https://doi.org/10.1007/s10641-017-0588-z