First finding of Ponto-Caspian invasive amphipod Chelicorophium curvispinum (G.O. Sars, 1895) (Amphipoda, Crustacea) in Lake Ladoga

The invasive amphipod Chelicorophium curvispinum (G. O. Sars, 1895) (Amphipoda, Crustacea) was first recorded in Lake Ladoga in the area of Volkhov Bay in August 2009. The data on quantitative development of this species and two other alien species of amphipods (Baikal Gmelinoides fasciatus (Stebbing, 1899) and Ponto-Caspian Pontogammarus robustoides G.O. Sars, 1894) in three different biotopes in the littoral zone of the lake are presented. The necessity of further detailed studies of new alien species distribution in Lake Ladoga is emphasized since their introduction can pose a serious threat to the ecosystem in the littoral of largest European lake.