Ref ID : 6601
Mercedes R. Marchese; The ecology of some Benthic Oligochaeta from the Parana River, Argentina. Hydrobiologia 155:209-214, 1987
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Simple and multiple correlations among physical and chemical parameters and densities of the dominant Oligochaete species were calculated for various channels of the middle Parana valley and its tributaries. Paranadrilus descolei Gavrilov, 1955, was observed in rivers with average depth and current velocity, mud-clay sediments, and low conductivity. Tubifex tubifex f. blanchardi Vejd., 1891 was found in channels of low depth, current velocity and discharge but with high conductivity. Limnodrilus hoffmeisteri Claparede, 1862, and Aulodrilus pigueti Kowalewski, 1914, were ubiquitous species. Narapa bonettoi Righi and Varela, 1983, was typical of rivers highest in depth, current velocity, and discharge with sandy sediments and low conductivity.