The main aim of the research was to assess the importance of riparian forests and other forest communities in the Poleski National Park, which constitute hydrogenic ecosystems for the number and occurrence of amphibians as an alternative food base for otters, and to determine the role of otters in limiting the occurrence of invasive fish species. The research was conducted in the Polesie National Park at 9 research sites. The otter’s potential food base was analyzed based on the composition of its excrement. In the conditions of the Polesie National Park during the period under study, amphibians did not constitute an alternative food base for otters, which is probably related to the high availability of fish. Based on the analysis of feces, it can be concluded that otters in the Poleski National Park may, to some extent, control the number of invasive and alien fish species, including the catfish and the silver crucian carp.
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