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Effects of mosquito larvae removal with Bacillus thuringiensis israelensis (Bti) on natural protozoan communities
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Population and conservation biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Population and conservation biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Population and conservation biology.
2008 (English)In: Hydrobiologia, ISSN 0018-8158, Vol. 607, no 1, 231-235 p.Article in journal (Refereed) Published
Abstract [en]

The protein crystals produced by Bacillus thuringiensis israelensis (Bti) are used against the larvae of pestiferous flood-water mosquitoes in ephemeral wetlands. Although mosquito larvae are considered important predators on protozoans and bacteria, it is not known how a distinct reduction of mosquito larvae density in natural wetlands caused by application of Bti may indirectly affect these microbial communities. Here we show, in a large scale experiment in six natural wetlands, that the densities of heterotrophic protozoans was on an average 4.5 times higher in wetland areas treated with Bti than in control areas. In addition, the taxonomic richness of heterotrophic protozoans increased on an average of 60% in areas with Bti application compared to control areas. The increase in protozoan density and richness was fairly consistent among sites of different wetland habitats. We discuss the potential implications of our results for other parts of the ecosystem.

Place, publisher, year, edition, pages
2008. Vol. 607, no 1, 231-235 p.
Keyword [en]
Aedes, Ochlerotatus sticticus, Protozoa, mosquito control, top-down control
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-110180DOI: 10.1007/s10750-008-9387-zISI: 000256080700022OAI: oai:DiVA.org:uu-110180DiVA: diva2:275510
Available from: 2009-11-05 Created: 2009-11-05 Last updated: 2010-01-08Bibliographically approved

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