Abstract
Eleven localities with minimal anthropic impact were sampled in the Odra River basin in 1995-1996. The main aim was (i) to define taxocoenoses of mayflies within the epirhithral benthic communities (ii) to compare data obtained recently with those from 1955-1960 in order to define long-term changes in species composition and biodiversity. The programmes and methods of TWINSPAN (Two Way INdicator SPecies ANalysis) and DECORANA (DEtrended CORrespondence ANAlysis) were used to define mayfly taxocoenoses. Rhithrogena iridina, Baetis alpinus and Epeorus sylvicola were found to be the most important indicators of mayfly communities in this area. Long-term environmental changes are discussed, no pronounced tendencies to deterioration within the area studied are apparent.
Published Version
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