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Populations of  Chaetogammarus ischnus  and  Pontogammarus robustoides  living in the middle part of the Włocławek Dam Reservoir (on the lower Vistula River, central Poland) were studied. The two species coexisted at offshore sites of the reservoir, with  P. robustoides  being much more abundant than  C. ischnus.  In samples collected from the bare bottom of the reservoir (sandy or covered by zebra mussel shells) and macrophytes a negative relationship between the two species was observed:  C. ischnus  occurred in high numbers in those samples in which abundance of  P. robustoides  was low. This phenomenon is postulated as resulting from the larger size and more predatory nature of  P. robustoides , limiting the occurrence of  C. ischnus.

oceanological and hydrobiological studies

Relationships between the occurrence of <i>Chaetogammarus ischnus</i> (Stebbing, 1898) and <i>Pontogammarus robustoides</i> (G. O. Sars, 1894) (Crustacea, Amphipoda) in a lowland Polish dam reservoir

Relationships between the occurrence of Chaetogammarus ischnus (Stebbing, 1898) and Pontogammarus robustoides (G. O. Sars, 1894) (Crustacea, Amphipoda) in a lowland Polish dam reservoir