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Glyphosate commercial formulation negatively affects the reproductive success of solitary wild bees in a Pampean agroecosystem

Por: Graffigna, Sofía. Universidad Nacional del Sur, San Juan. Departamento de Biología, Bioquímica y Farmacia. Bahía Blanca, Buenos Aires, Argentina. Laboratorio de Interacciones Bióticas en Agroecosistemas (LIBA). Bahía Blanca, Buenos Aires, Argentina. CONICET. Centro de Recursos Naturales Renovables de las Zonas Semiáridas. Bahía Blanca, Argentina.
Colaborador(es): Marrero, Hugo Javier. Laboratorio de Interacciones Bióticas en Agroecosistemas (LIBA). Bahía Blanca, Buenos Aires, Argentina. CONICET. Centro de Recursos Naturales Renovables de las Zonas Semiáridas. Bahía Blanca, Argentina | Torretta, Juan Pablo. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Cátedra de Botánica General. Buenos Aires, Argentina. CONICET. Buenos Aires, Argentina.
ISSN: 0044-8435 (impreso); 1297-9678 (en línea).Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): | AGROCHEMICAL EFFECTS | MEGACHILE | BEE SURVIVAL | TRAP NESTS | AGRICULTURAL MANAGEMENT | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Apidologie Vol.52, no.1 (2021), p.272–281, grafs.Resumen: Glyphosate is the most widely used herbicide worldwide and it could have negative effects on wild bees. We study the effect of glyphosate commercial formulation on the nesting behavior of wild solitary bees (Megachile spp.) and the survival of immature stages in a Pampean agroecosystem. In four plotswithout agricultural management located in an agricultural field, we placed 480 wooden trap-nests. The traps were sprayed with two different concentrations of glyphosate commercial formulation and only with water. The number of cells per nest was significantly lower in glyphosate treated traps compared with the water treatment. The probability of finding breeding cells was two times higher in nests without glyphosate commercial formulation compared with treated nests. Larvae completed their development and emerged as adults approximately four times more in nests without glyphosate commercial formulation, relative to those with glyphosate. Our results indicate that glyphosate commercial formulation could be conditioning the behavior of the nesting females and it is affecting their reproduction.
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Glyphosate is the most widely used herbicide worldwide and it could have negative effects on wild bees. We study the effect of glyphosate commercial formulation on the nesting behavior of wild solitary bees (Megachile spp.) and the survival of immature stages in a Pampean agroecosystem. In four plotswithout agricultural management located in an agricultural field, we placed 480 wooden trap-nests. The traps were sprayed with two different concentrations of glyphosate commercial formulation and only with water. The number of cells per nest was significantly lower in glyphosate treated traps compared with the water treatment. The probability of finding breeding cells was two times higher in nests without glyphosate commercial formulation compared with treated nests. Larvae completed their development and emerged as adults approximately four times more in nests without glyphosate commercial formulation, relative to those with glyphosate. Our results indicate that glyphosate commercial formulation could be conditioning the behavior of the nesting females and it is affecting their reproduction.

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