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Limnological Studies on Tjeukemeer - a typical Dutch "polder reservoir"Notes on the gammarid fauna of the Frisian lake district following the invasion of the alien amphipod, Gammarus Tigrinus sextoninvestigations on the littoral fauna of the TjeukemeerThe dominance, production and utilization of Gammarus Tigrinus (Sexton) in the exposed Phragmites reed beds of the TjeukemeerThe status of the alien amphipod Gammarus Tigrinus (Sexton, 1939) in Friesland twenty five years after its introduction into the NetherlandsThe IBP project of the Limnological Institute (Tjeukemeer), bottom fauna