Abstract
The current distribution of the Ponto-Caspian alien mollusk species of the genus Dreissena (Dreissena bugensis and D. polymorpha) in the water bodies of the Middle and Lower Volga is shown. Since the invasion of quagga mussel (D. bugensis) which took place 20 years ago, the occurrence ratio of this species has remained stable. This fact provides no evidence for the ongoing replacement of one species by another. The distribution area of D. polymorpha is expanding presently owing to its penetration into rivers where this species was never registered before.
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