PERSONAL DE APOYO
FANELLI Silvia Laura
congresos y reuniones científicas
Título:
Riparian buffer zones protect small stream ecosystems in intensive soy production regions of South America
Autor/es:
HUNT L; BONETTO C; LYDY, M.; FORSIN BUSS D; FANELLI S.L.; MARROCHI N; VINCENT H RESH
Lugar:
Madison, Wisconsin
Reunión:
Congreso; The North American Congress for Conservation Biology (NACCB); 2016
Institución organizadora:
Society for Conservation Biology North America
Resumen:
Soy production has recently become a major export crop in South America, resulting in dramatic land use change, deforestation, and other environmental impacts. Brazil and Paraguay have adopted new laws to protect riparian zones, requiring forested stream buffers of 15 to 100m. In contrast, Argentina has no national regulations to protect riparian zones. We studied 48 streams in soy production regions of all 3 countries, collecting data on pesticides, water quality, habitat, land use, and benthic invertebrate communities. Insecticide toxic units were highest in streams with buffers < 20 m, with buffer width being the most important predictor variable. Buffer zones were smallest in Argentina, where insecticide TUs were inversely correlated with the Species at Risk pesticide macroinvertebrate index. In Paraguay and Brazil, habitat quality and sedimentation were more important than pesticides in determining variability in invertebrate community structure, and buffer width was positively correlated with abundance of sensitive taxa such as Ephemeroptera.