The late Pleistocene/Holocene and recent Bosmina (Eubosmina) fauna (Crustacea: Cladocera) of the pre-alpine Starnberger See (FRG)

An analysis of the remains of Bosmina (Eubosmina) in a sedimentcore from the pre-alpine, mesotrophic Starnberger See showedthat the lake was inhabited by B. longispina since the OldestDryas. In the Subatlantic- -1900 years ago — the kesslerimorph of B. coregoni invaded the lake and both taxa have sinceco-existed. Although there was considerable morphological variation,B. longispina clearly differed from Circumbaltic populationsthrough most of the late Pleistocene and Holocene periods. Inthe recent Bosmina fauna of the lake two morphologically wellseparated taxa (B. longispina ruehei and a morph of B. coregoni)occur which differ clearly from the Bosmina remains found inthe core up to the uppermost sample from 7 cm sediment depth.B. coregoni f. kessleri appeared in the lake in a period whenit was supposedly still oligotrophic. The Bosmina successionobserved in the Starnberger See resembles the pattern foundin deep north German lakes.