Fig. 1

Maps showing the geographical position of Lake Baikal in Asia (above) and the sampling points of the four studied amphipod species at Lake Baikal (below). Depicted are also major river inflows (Selenga River delta; Angarskiy Sor that comprises the inflows of the Upper Angara and Kichera Rivers; Sarma River delta) and the Angara River outflow. The Akademicheskiy Ridge is an underwater shelf separating basins in northern and central Baikal. See Additional file 4: Figure S1 for the detailed bathymetric chart of Lake Baikal. Maps based on freely available cartographic material from Natural Earth (see Materials and Methods)