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.

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Journal Bulletin Zoologisch Museum
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Citation
Smit, Harry. (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.