Abstract
The abundance of Chironomus plumosus (32 %), Endochironomus intextus (42 %), Glyptotendipes paripes (12 %), and Polypedilum nubeculosum (12 %) was investigated from August until December 1978. Depending on O2-content a migration of C. plumosus into depth was observed. C. plumosus represents the largest part of the biomass with an average of 73 %, E. intextus (24 %), G. paripes (7 %), and P. nubeculosum (4 %). The total biomass increases from 0.02 g dry wt./m2 at the end of August to 1.6 g dry wt./m2 at the beginning of December. The production of C. plumosus amounts to 0.81 g dry wt./m2 for the sampling period. The autumn overturn affects only C. plumosus larvae.
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