engleski

Meiofauna and free-living aquatic nematodes from some stations along the Drava River (Croatia)

Sediment meiofauna and aquatic free-living nematodes were investigated at five littoral stations along the Drava River (11.0-77.0 stream km). Meiofauna abundance and diversity differ between investigated stations. In the sediment of station 5 (sandy sediment) only a few meiofaunal groups were found, with a high dominance of oligochaeta. The nematofauna of station 4 (sand-silt) differs from that recorded in the other stations investigated. In this station the lowest number of species were recorded. as well as the lowest diversity index (H'", d), and a high dominance of species (D%) belonging to the genus Rhabditis. Cluster analysis based on nematode relative abundance resulted in only station 4 being distinct. Biological data indicate the influence of the discharge of untreated effluent into the Drava River.

river; sediment meiofauna; freshwater nematodes

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