Abstract
In five marine species of the amphipod genus Gammarus (G. duebeni, G. zaddachi, G. salinus, G. oceanicus, and G. locusta) the electrophoretically defined variation at 19 loci in populations from the Baltic Sea and the Kattegat is compared. In four out of the five Gammarus species there is evidence for differentiation among the Baltic and the Kattegat populations. In addition, the phylogenetic relationship of the five Gammarus species and a single species in the genus Chaetogammarus (C. marinus) is described.
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