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1 2012

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Distribution of Cladocera communities across a climate gradient in shallow lakes from Croatia to Hungary: a preliminary study

Kӧvér C, Korponai J, Katalinic A, Bereczki C

Studia Quaternaria

2012

Vol. 29

45--52

Cladocera communities in surface sediments of seven lakes were sampled from the Mediterranean to north Hungary. Conductivity, pH, primary ions (Ca2+, Mg2+, Na+, K+, Cl-, SO42-, HCO3-, CO32-) and macrophyte coverage were measured as contributed environmental parameters for the distribution of cladoceran communities across the lakes. Thirtytwo cladoceran species were found in the seven lakes. The recorded species have wide tolerance spectra, and are able to colonize very different kind of habitats. The most common and abundant species were Chydorus sphaericus, Alona rectangula and Bosmina longirostris. Lake area, latitude, macrophyte coverage, pH, conductivity and hardness were found to be the most determinant environmental variables in the distribution of cladoceran species. This study revealed that although the lakes show a clear separation in environmental parameters the composition and distribution of Cladoceran communities differ only slightly across the investigated geographical gradient.