Range extensions of the alien amphipod Gammarus tigrinus Sexton, 1939, in the Netherlands have been surveyed in 1973. Only a few extensions were discovered, whereas some localities where the species previously has been recorded, now were found deserted. The present occurrence of competing local gammarid species is also discussed.

Bulletin Zoologisch Museum

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Naturalis journals & series

Smit, H. (1974). Extension de l’aire de repartition de Gammarus tigrinus Sexton en 1973 aux Pays-Bas, et quelques remarques sur la concurrence avec les Gammares indigenes (Crustacea, Amphipoda). Bulletin Zoologisch Museum, 4(5), 35–38.