Abstract
Oligochaeta assemblages from Lake Banyoles were composed of one species of Naididae and eight species of Tubificidae, Potamothrix heuscheri (8–1350 ind. m-2) being the most abundant and widely distributed species, followed by Limnodrilus hoffmeisteri (25–858 ind. m-2) and Psammoryctides barbatus (12–792 ind. m-2). The remaining species were Potamothrix hammoniensis, Potamothrix bavaricus, Limnodrilus claparedeanus, Branchiura sowerbyi, Aulodrilus pigueti and Dero digitata, all of which occurred at lower densities and with restricted distributions.
Regardless of sampling depth, maximum densities of oligochaetes were found in winter (up to 5,142 ind. m-2 in December) and secondarily in June. Immature Tubificidae with hair setae and mature P. heuscheri were present and dominant throughout the year. Cestode parasites were recorded infesting L. hoffmeisteri and P. heuscheri populations.
Oligochaeta densities increased with depth, but low oxygen concentrations (less than 1 mg 1-1) during a long period (4 months) in some basins of the lake acted as a key factor in reducing the density of worms and the species richness to one species, Potamothrix heuscheri.
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Rieradevall, M., Real, M. (1994). On the distribution patterns and population dynamics of sublittoral and profundal oligochaeta fauna from Lake Banyoles (Catalonia, NE Spain). In: Reynoldson, T.B., Coates, K.A. (eds) Aquatic Oligochaete Biology V. Developments in Hydrobiology, vol 95. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0842-3_17
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DOI: https://doi.org/10.1007/978-94-011-0842-3_17
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