engleski

Macrozoobenthos of Drainage Ditches at Two Reservoirs in the Drava River

Macrozoobenthos of drainage ditches at Čakovec and Dubrava reservoirs were investigated during 1999. Over the investigated period 44 macroinvertebrate taxa were recorded. Ditches contain seeping water from a power plant reservoirs, and the only restricted factor for greater macroinvertebrate diversity is relatively low amount of oxygen. Chironomids have higher species richness (13 species, including 8 Orthocladiinae). Mean density was highest at site Č-1 (7157 ind.m-2), and lowest at D-1 (2449 ind.m-2). Amphipods dominated in all stations, their biomass share ranged from 37.3 % of total macrobenthos biomass at site D-1 to 93.4% at site Č-1. Comparing chemical characteristics of water, there were only minor variations among sites, but multidimensional scaling (MDS) analysis clearly separates Č-1 from another stations, due to differences of sediment covered by periphyton.

macrozoobenthos; drainage ditch; seepage water; reservoir

Limnological reports