Abstract
Data are presented on the distribution and state of populations of a rare species, the European freshwater pearl mussel, in the rivers of Karelia. Populations of Atlantic salmon in the rivers surveyed, and pearl mussel glochidial infection in salmon juveniles were analyzed. It is demonstrated that timber floating, hydropower engineering, pearl harvesting and deforestation have resulted in extinction of the pearl mussel in several rivers. Decline in juvenile salmon abundance has negative influence on the pearl mussel recruitment. However, our data prove that Karelia, both the White Sea and the Baltic Sea catchments, still possesses viable populations of the pearl mussel.
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