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pp. 73 -
77

A comparative analysis of shell form in two dreissenid species, Dreissena polymorpha and D. bugensis, from the Rybinsk Reservoir was performed. The adaptations of these mussels to the same conditions have shown to be different. An assumption was made that the presence of a closely-related species in the biocenosis may influence the morphological variability of mussels. 

Морфологическая изменчивость дрейссен (Dreissenidae, Bivalvia) Рыбинского водохранилища при совместном и раздельном обитании
Павлова В. В.;