Seasonal Vertical Migration and Aestivation of Rhyacodrilus hiemalis (Tubificidae, Clitellata) in the Sediment of Lake Biwa, Japan


The vertical distribution of the tubificid worm Rhyacodrilus hiemalis Ohtaka, the numerically dominant species of oligochaete in the littoral of Lake Biwa, was studied with special reference to seasonal vertical migration in the lake sediment. Monthly collections of lake sediment cores were made using PVC tubes. Core sections of sample sediments ranged from… (More)
DOI: 10.1007/s10750-005-1710-3


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