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A six-year study of insect emergence from temporary flooded wetlands in central Sweden, with and without Bti-based mosquito control

Published online by Cambridge University Press:  27 May 2010

T.Z. Persson Vinnersten ,
J.O. Lundström ,
M.L. Schäfer ,
E. Petersson  and
J. Landin
T.Z. Persson Vinnersten*
Affiliation:
Department of Ecology and Evolution/Population Biology and Conservation Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden Swedish Biological Mosquito Control Project, Nedre Dalälvens Utvecklings AB, Gysinge, Sweden
J.O. Lundström
Affiliation:
Department of Ecology and Evolution/Population Biology and Conservation Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden Swedish Biological Mosquito Control Project, Nedre Dalälvens Utvecklings AB, Gysinge, Sweden
M.L. Schäfer
Affiliation:
Department of Ecology and Evolution/Population Biology and Conservation Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden Swedish Biological Mosquito Control Project, Nedre Dalälvens Utvecklings AB, Gysinge, Sweden
E. Petersson
Affiliation:
Department of Ecology and Evolution/Animal Ecology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden Institute for Freshwater Research, Swedish Board of Fisheries, Drottningholm, Sweden
J. Landin
Affiliation:
Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
*
*Author for correspondence Fax: +46 18 4716424 E-mail: Thomas.Persson@ebc.uu.se
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Abstract

In temporary wetlands in the River Dalälven floodplains, recurrent but irregular floods induce massive hatching of the flood-water mosquito Aedes sticticus, which causes enormous nuisance. Flood-water mosquito control using the biological larvicide Bacillus thuringiensis var. israelensis (Bti) was commenced in parts of the floodplains during 2002, and here we report the first six years of full-season monitoring of general insect emergence from temporary wetlands with and without treatment. Emergence traps, which were emptied weekly, were used from May to September each year. A total of 137,153 insects of 13 taxonomic orders were collected. Diptera was highly dominating and especially the sub-order Nematocera with 18 families was a very prominent taxon. Bti-treatment effects were analysed by taxonomic order, by sub-order in Diptera and Hemiptera, and by family for Nematocera and Coleoptera for the whole study period. We found no significant negative effects of Bti treatments on the production of insects by taxonomic order, with the exception of Coleoptera in the long term. However, no significant negative effects were found for the Coleoptera families, neither in the short term nor in the long term. There was no significant negative treatment effect on Nematocera production, neither when analyzed for the whole sub-order nor when analyzed by family. However, abundance of Ceratopogonidae was significantly higher in experimental than in reference wetlands. We conclude that Bti-treatment effects on insect production may be minute in comparison to other environmental factors structuring the insect fauna of the temporary wetlands studied.

Keywords

wetland insectsinsect productionBtitemporary wetlands
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 6 , December 2010 , pp. 715 - 725
Copyright
Copyright © Cambridge University Press 2010

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