Do Multi-year Applications of Bacillus thuringiensis subsp. israelensis for Control of Mosquito Larvae Affect the Abundance of B. cereus Group Populations in Riparian Wetland Soils?
| Autor: | Ingvar Sundh, Jan O. Lundström, Petter Melin, Niels Bohse Hendriksen, Salome Schneider, Tania Tajrin |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
VAR. ISRAELENSIS Veterinary medicine Mosquito Control 030106 microbiology Bacillus thuringiensis FATE Biological pest control Soil Science Biology Mosquito larvae Swamp Alder 03 medical and health sciences Bacillus cereus Microbial ecology CULICIDAE Abundance (ecology) Animals Pest Control Biological Soil Microbiology Ecology Evolution Behavior and Systematics Sweden geography geography.geographical_feature_category Bacteria Ecology PERSISTENCE fungi QUANTIFICATION biology.organism_classification qPCR SPORES Mosquito control Culicidae PCR 030104 developmental biology Larva Wetlands Biological control DIPTERA Seasons Long-term effect Soil microbiology |
| Zdroj: | Schneider, S, Tajrin, T, Lundstrom, J O, Hendriksen, N B, Melin, P & Sundh, I 2017, ' Do Multi-year Applications of Bacillus thuringiensis subsp israelensis for Control of Mosquito Larvae Affect the Abundance of B-cereus Group Populations in Riparian Wetland Soils? ', Microbial Ecology, vol. 74, no. 4, pp. 901-909 . https://doi.org/10.1007/s00248-017-1004-0 |
| ISSN: | 1432-184X 0095-3628 |
| DOI: | 10.1007/s00248-017-1004-0 |
| Popis: | Bacillus thuringiensis subsp. israelensis (Bti) is a soil-borne bacterium affiliated to the Bacillus cereus group (Bcg) and has been used in biocontrol products against nematoceran larvae for several decades. However, knowledge is limited on whether long-term Bti application can affect the structure of indigenous communities of Bcg and the overall abundance of Bti. Using species- and group-specific quantitative PCR assays, we measured the Bcg- and Bti-abundances in riparian wetlands in the River Dalalven floodplains of central Sweden. On five occasions during one vegetative season, soil samples were collected in alder swamps and wet meadows which had been treated with Bti for mosquito larvae control during the preceding 11 years, as well as in untreated control sites and well-drained forests in the same area. The average abundance of Bcg in alder swamps was around three times higher than in wet meadows. Across all sites and habitats, the Bti treatments had no effect on the Bcg-abundance, whereas the Bti-abundance was significantly higher in the treated than in the control sites. However, for individual sampling sites, abundances of Bti and Bcg were not correlated with the number of Bti applications, indicating that added Bti possibly influenced the total population of Bti in the short term but had only a limited effect in the longer term. The findings of this study increase the understanding of the ecology of Bti applications for mosquito control, which can facilitate environmental risk assessment in connection with approval of microbiological control agents. |
| Databáze: | OpenAIRE |
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