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Effects of an artificially changed stream bottom on emerging insects

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons56984

Wagner,  Rüdiger
Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Zitation

Wagner, R. (1984). Effects of an artificially changed stream bottom on emerging insects. Verhandlungen der Internationalen Vereinigung für Limnologie, 22, 2042-2047.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-CB28-F
Zusammenfassung
Substrate type and substrate distribution are major factors influencing distribution, quality, and quantity of benthos organisms. To compare the fauna on the normal heterogenous substrate of Breitenbach (Germany), a layer of fine sand was made deposit by reducing stream velocity on a study stretch. Emerging insects were collected with the greenhouse method. Species present were the same in both cases. On the sandy stretches number of specimens decreased for more than 90% in Ephemeroptera, 30% in Plecoptera, 55% in Trichoptera and about the same in Diptera. Although total numbers strongly decreased, individual species increased by 190% (Leuctra nigra ) or even 1000% (Centroptilum lutelum ), as compared to the control.