Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Distribution and density of populations of Dreissena polymorpha (Pallas, 1771) in the peripheral part of The Range.

Abstract

In 2015-2017, the distribution of the freshwater bivalve Dreissena polymorpha was studied in the basin of the Northern Dvina River. This study provides the first record of the populations of D. polymorpha in the Yuras, Lyavlya, and Solombalka rivers. The density of the studied colonies of D. polymorpha was lower in comparison with populations in other parts of the range (Mann-Whitney U test, P = 0.01); its average value was 232.9 ind./m2 (from 0 to 4023.8 ind./m2). The effect of various environmental factors on the distribution and abundance of zebra mussel in watercourses is discussed.