Abstract
The composition and spatial distribution of macrozoobenthos were studied in 26 watercourses of the Biya River basin from 1997 to 2004. The bottom fauna of the basin’s rivers includes 382 species, 217 genera, 81 families, 21 orders, 11 classes, and 7 types of invertebrates. Species common in the northern and eastern Palearctic prevail, presumably evidencing the oriental origin of the rheophylic benthic fauna. Four basic and two intermediate types of benthic communities were revealed. These communities differ in the structures of the complexes dominant by biomass. The successive substitution of the communities from the upper reaches of Lake Teletskoye tributaries to the Biya mouth depends on factors related to the basin’s relief and corresponds to changes in the landscape and hydrological conditions. This substitution generally conforms to the concept of river continuum.
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