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Effects of an artificially silted stream bottom on species composition and biomass of Trichoptera in Breitenbach

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

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Citation

Wagner, R. (1987). Effects of an artificially silted stream bottom on species composition and biomass of Trichoptera in Breitenbach. In M. Bournaud, & H. Tachet (Eds.), Proceedings of the 5th International Symposium on Trichoptera (pp. 349-352). Dordrecht, The Netherlands: Dr. W. Junk Publishers.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-CAE0-6
Abstract
By putting a weir immediately below an emergence trap, current velocity was reduced, and thus a layer of fine sand was deposited. There was a significant decrease in specimen numbers for most of the dominant taxa, Agapetus fuscipes, Tinodes rostocki, Sericostoma personatum, and Rhyacophila fasciata . No effect was observed for Apatania fimbriata and Chaetopteryx villosa . Trichoptera biomass was reduced for about 1/3 to 2/3. The amount of specimens in the sandy trap showed a heavy influence of the mode of emergence in between different species. Drift distances during emergence vary from about 50 cm to 10 m, depending on current velocity and on the species.