Ecological effects of mosquito control with Bti: evidence for shifts in the trophic structure of soil- and ground-based food webs

Brendan G. McKie; Astrid Taylor; Tobias NilssonAndre FrainerWillem Goedkoop

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Ecological effects of mosquito control with Bti: evidence for shifts in the trophic structure of soil- and ground-based food webs

机译：Ecological effects of mosquito control with Bti: evidence for shifts in the trophic structure of soil- and ground-based food webs

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摘要

The microbial control agent Bacillus thuringiensis var. israelensis (Bti) has been successfully used worldwide to reduce abundances of biting Nematocera (Diptera), often with little direct impact on non-target organisms observed. However, the potential for additional indirect effects on other ecosystem properties, including on trophic linkages within food webs, is poorly known. We investigated the effects of multiple-year mosquito control treatments using the Bti product VectoBac?-G on the stable isotope composition of epigeal and soil-based consumers inhabiting replicate floodplains along the River Dalael-ven, Sweden. We observed significant changes in the isotopic composition of detritivores feeding at the base of floodplain food webs. Enchytraeid worms were characterised by 3.5 higher δ~(13)C values in treated floodplains, suggesting increased consumption of δ~(13)C-enriched food. The overall range of community-wide δ~(15)N values was 56 greater in the treated flood-plains, whilst δ~(15)N values of oribatid mites were elevated by 97. These results suggest extra fractionation in the transfer of nitrogen through floodplain food chains. We conjecture that the ecological mechanisms driving these food web shifts are (1) the mass mortality of high δ~(13)C A. sticticus larvae, which leaves high concentrations of dead mosquito biomass deposited on soils at local scales, after the floodwaters have receded and (2) incorporation of the very high δ~(13)C-enriched corn particles comprising the bulk of the VectoBac?-G product into floodplain food webs. Our results suggest that repeated applications of Bti might have wider, still largely unknown implications for nutrient and energy cycles within floodplain ecosystems.

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来源
《Aquatic sciences》 |2023年第2期|177-191|共15页
作者
Brendan G. McKie; Astrid Taylor; Tobias NilssonAndre FrainerWillem Goedkoop;
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作者单位

Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, 75007 Uppsala, Sweden;

Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, 9037 Troms0, Norway, Norwegian Institute for Nature Research (NINA), Fram Centre, 9296 Troms0, Norway;

Department of Ecology, Swedish University of Agricultural Sciences, 75007 Uppsala, Sweden;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种英语
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关键词
Aedes sticticus Bacillus thuringiensis var. israelensis (Bti); Floodplain; Isotopic niche metrics; Soil microarthropods Spiders; Polyunsaturated fatty acids;

Ecological effects of mosquito control with Bti: evidence for shifts in the trophic structure of soil- and ground-based food webs

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