Diel periodicity of benthos in riffle regions of polluted Widawka River, Poland

Maria Grzybkowska, Daria Pakulska, Henryk Jakubowski, S Ravichandra Reddy

Abstract


Did variations in the densities of benthic invertebrates inhabiting the riffle regions of polluted Widawka river. Poland, were studied in spring 1985. Variations in water and sediment temperatures were independent of fluctuations in air temperature. Oligochaetcs, crustaceans and chironomids were most dominant in the riffle regions. While crustaceans and oligochaetes displayed a clear night activity pattern, chironomids, molluscs and others failed to indicate any such preference. 

Keywords


Benthos; did periodicity; polluted river.

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