Abstract
Obesogammarus crassus, a new Ponto-Caspian gammarid species has been recorded in Poland in the deltaic Vistula system. Notes on its origin, places of acclimatization in Europe, as well as probable ways of invasion are presented. Since the majority of alien gammarid species is still poorly recognized, the authors include a simple key and figures allowing the identification of all Ponto-Caspian gammarid crustaceans recently appearing in Polish waters.
Highlights
In 1998-2000, d u r in g ex ten siv e stu d ie s of th e d is trib u tio n of a m p h ip o d c ru sta ceans in the lo w e r V istu la a n d its d eltaic sy stem, a larg enumber of gamma rid s w e re co llected (o v er 60 sa m p le s w ith so m e 3000 sp ecim en s)
O. crassus su rvived, amongo thers, in lake D usia, w hich is situ ated at the P olish-L ithuanian border
Basis of se v e n th p e re o p o d (P7) d ista lly ta p e rs a n d th e w id th of this artic le in its d istal p a r t is m o re o r less equal to th e w id th o f isc h iu m (Fig. 3b)
Summary
In 1998-2000, d u r in g ex ten siv e stu d ie s of th e d is trib u tio n of a m p h ip o d c ru sta ceans in the lo w e r V istu la a n d its d eltaic sy stem , a larg enumber of gamma rid s w e re co llected (o v er 60 sa m p le s w ith so m e 3000 sp ecim en s). D ertak e n in w hich m an y crustacean species, especially from the P onto-C aspian zoogeographical province, w ere transferred to m a n y freshw ater basins, especially to artificial lakes bu ilt on som e large rivers (dam -reservoirs). The aim of these acclim atizations w as to enrich th e food-resources for fishes. O. crassus su rvived, amongo thers, in lake D usia, w hich is situ ated at the P olish-L ithuanian border
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