Abstract
The article presents data on fish community structure and distribution in lakes of Aukstaitija National Park as well as dynamics of quantitative and qualitative parameters of biological indices in those lakes. Investigations were performed in 20 different-sized lakes in 1993–2002. It was established that due to anthropogenic load trophicity of certain small lakes had significantly changed. A total of 26 species representing eight families was recorded in the investigated lakes. Fish communities of the majority of mesotrophic and eutrophic lakes were dominated by roach (Rutilus rutilus L.), on average making up 42% of the number and 30% of the weight of fish caught in a lake, and perch (Perca fluviatilis (L.)), constituting 16% and 4%, respectively. The most intense changes in fish diversity and community structure were recorded in the small lakes Joskutis, Baltys, and Juodenis, previously poisoned with polychlorpinen. In the other lakes, no changes in species diversity were observed in 1960–2002. As a res...
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