Abstract

The rotifer Kellicottia bostoniensis (Rousselet, 1908), which is common in North American water-bodies, has been recorded in 13 different lakes of the European part of Russia. A morphometric analysis has been made of populations from 7 lakes. The assumption has been made that the size of the spines of K. bostoniensis in small waterbodies depends on the presence of predators. Depth-related changes in density and viscosity in deep lakes with temperature stratification can also influence this feature.

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