The spread rates of alien species of Amphipoda and Mysida were calculated for the Dnieper, Pripyat, and Neman rivers within the territory of Belarus. The maximum values of spread rate were obtained for Dikerogammarus villosus (in the Pripyat River, 37.8 km/year; in the Dnieper River, 17 km/year) and Dikerogammarus haemobaphes (in the Pripyat River, 53.6 km/year; in the Dnieper River, 17 km/year), while the minimum values of spread rate were calculated for mysids Paramysis lacustris (in the Dnieper River, 0.4 km/year) and Limnomysis benedeni (in the Dnieper River, 0.6 km/year) and also for amphipods Chelicorophium robustum (in the Dnieper River, 0.5 km/year) and Echinogammarus trichiatus (in the Dnieper River, 1.3 km/year). The differences in the spread rates of the species are related to the time of their first record at the monitoring sites and the intensity of shipping in the studied rivers.
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