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Biochemical Systematic Relationships Among the Freshwater Amphipods Gammarus Varsoviensis, G. Lacustris and G. Pulex

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The systematic position of the freshwater amphipod G. varsoviensis Jazdzewski from northern Poland and Germany, split off recently from G. lacustris Sars in the same area, was assessed by allozyme electrophoresis. A distant evolutionary relationship between the two species was indicated, similar to that between them and G. pulex (L.), and to those earlier recorded between marine and freshwater Gammarus spp. (genetic identities I = 0.1-0.2). The neutral terms currently used for subdivisions of the genus, such as the G. pulex group which includes the three species studied, refer to units too ancient to have retained traces of a common ancestry at the allozyme level; adoption of subdivisions based on phylogenetically closer, genetically identifiable relationships is suggested.

Affiliations: 1: ) Department of Genetics, P.O. Box 17, SF-00014 University of Helsinki, Finland; 2: ) Department of Invertebrate Zoology and Hydrobiology, University of Łódz, Ul. S. Banacha 12/16, PL-90-237 Łódz, Poland

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