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Laurent Lagadic, Marc Roucaute and Thierry Caquet Bti sprays do not adversely affect non-target aquatic invertebrates in French Atlantic coastal wetlands Journal of Applied Ecology 51

Version of Record online: 20 SEP 2013 | DOI: 10.1111/1365-2664.12165

Reduced application rate and targeted spraying of VectoBac® WG in mosquito breeding sites minimize potential environmental impacts of Bacillus thuringiensis var. israelensis (Bti). Even so, surveillance of its possible primary side effects is needed, which requires comparable control and treated areas. Indeed, systematic temporal trends and subtle differences in the range of variation of abiotic factors result in discrepancies between control and treated area in terms of invertebrate abundance, which could be wrongly attributed to VectoBac®. Management decisions and mitigation measures may therefore benefit from (i) extending surveillance to a time frame that allows for coverage of the immense temporal variation in taxa abundance and diversity and (ii) the inclusion of environmental variables in the monitoring of non-target animal communities potentially exposed to Bti.

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