Invasion

Invasion Description

(Extinct native populations) Germany/Greifswalder Bodden (68,770 years before 1997, Behrends et al. 2005, dating of oldest shells in sediment)

Geographic Extent

Denmark-Sweden (Jensen and Knudsen 2005); Oresund/Germany-Sweden/western Baltic Sea (Olenin and Leppakoski 2007); Lomma/Sweden/Oresund (Lasota et al. 2004); Germany/Darß-Zingst-Bodden-Chain (Wittfoth and Zettler 2013); Helsingborg/Sweden/Oresund (1923, ANSP 134712, Academy of Natural Sciences of Philadelphia 2012)