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Increasing neonicotinoid use and the declining butterfly fauna of lowland California.

Forister, Matthew L; Cousens, Bruce; Harrison, Joshua G; Anderson, Kayce; Thorne, James H; Waetjen, Dave; Nice, Chris C; De Parsia, Matthew; Hladik, Michelle L; Meese, Robert; van Vliet, Heidi; Shapiro, Arthur M.
Biol Lett; 12(8)2016 08.
Artigo em Inglês | MEDLINE | Ago 2016 | ID: mdl-27531159
Resumo: The butterfly fauna of lowland Northern California has exhibited a marked decline in recent years that previous studies have attributed in part to altered climatic conditions and changes in land use. Here, we ask if a shift in insecticide use towards neonicotinoids is associated with butterfly declines at four sites in the region that have been monitored for four decades. A negative association between butterfly populations and increasing neonicotinoid application is detectable while controlling for land use and other factors, and appears to be more severe for smaller-bodied species. These results suggest that neonicotinoids could influence non-target insect populations occurring in proximity to application locations, and highlights the need for mechanistic work to complement long-term observational data.