Abstract

The morphological and genetic variability of Daphnia species from 16 lakes in the upper watersheds of the Ob and Yenisei Rivers were investigated. Four species, namely D. galeata Sars 1863, D. cristata Sars 1862, D. curvirostris Eylmann, 1887 and D. longispina O.F. Muller, 1776 inhabit these lakes. In addition, longispina-like individuals in Lake Borzu-Khol (the Bolshoi Yenisei River basin) were found which were, however, clearly distinguishable from the other species by morphometric and mitochondrial DNA analyses and could belong to D. umbra based on the 12S sequences.

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