[The last natural river in Eastern Europe?] Caddisflies (Trichoptera) of the Neman River
2004
Czachorowski, S.(University of Warmia and Mazury, Olsztyn (Poland). Faculty of Biology. Dept. of Ecology and Environmental Protection)E-mail:[email protected]
Caddisflies were investigated during the spring, summer and autumn in 1997-1999, in 40 localities, situated between Lida and Grodno (Belarus - middle course of the Neman River). 74 species of Trichoptera were collected. In the qualitative analysis fauna and streams, valley water bodies (oxbows, periodical pools) and springs were distinguished. In the quantitative analysis, water bodies with poor fauna (springs and artificial waters) were distinguished very closely. The caddisflies of the Neman River and large and small tributaries were different. Some assemblages typical for potamal and rithral zone were distinguished. Different dominant species occurred in all these assemblages. The effect of "neighbouring water bodies" and animal migrations were shown for all waters bodies occurring in a lowland river valley. It could be expected that relative eurytopic strategies and the wide geographical distribution of some caddisflies are an adaptation to living in a changing post-glacial landscape (a lakeland landscape) and in a landscape with large lowland rivers.
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