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In 2016, the species composition and the structure of the dominance of molluscs in the Muchawka River (left-bank tributary of the Liwiec River) were assessed. The occurrence of 19 species of molluscs were recorded, including 11 species of snails and 8 species of mussels. The eudominant was Pisidium casertanum, which, only in the last two sites, constituted 43.1% of all molluscs. Two other species...
Różnorodność muszli różnych gatunków mięczaków była, zwłaszcza dawniej, podstawą ich klasyfikacji systematycznej. Na muszlach ślimaków i małży żyjących kilka-kilkanaście lat często także odzwierciedla się historia ich życia osobniczego. U mięczaków wodnych takie czynniki środowiska jak: chemizm wody, żyzność, rodzaj dna, obecność lub brak przepływu, wpływają na wielkość muszli, grubość, wzrost. Widoczne...
Reproductive pattern of V. viviparus was studied in the years 1990-1994. The study was carried out in selected sites of the Zegrzyński Reservoir (Central Poland) and in outlet zones of its tributaries. Distinct prevalence of females over males was found. Sex ratio varied seasonally. In spring the percentage of females was the highest and decreased later on. In spring, reservoir sites were dominated...
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