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Exotic plants promote pollination niche overlap in an agroecosystem

Colaborador(es): Marrero, Hugo Javier. Instituto Argentino de Investigaciones de las Zonas Áridas, Centro Científico y Tecnológico Conicet Mendoza, Av. Ruiz Leal s/n, Parque General San Martín, 5500 Mendoza, Argentina. E-mail address: hugomarrero@gmail.com | Torretta, Juan Pablo. Universidad de Buenos Aires, Facultad de Agronomía, Cátedra de Botánica General, Conicet, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina | Vázquez, Diego P. Instituto Argentino de Investigaciones de las Zonas Áridas, Conicet, CC 507, 5500 Mendoza, Argentina y Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, M5502JMA Mendoza, Argentina | Hodara, Karina. Departamento de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina | Medan, Diego. Universidad de Buenos Aires, Facultad de Agronomía, Cátedra de Botánica General, Conicet, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina.
ISSN: 0167-8809.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ECOSYSTEM SERVICE | FLOWER VISITOR | LAND USE INTENSIFICATION | PLANT NICHE OVERLAP | POLLEN TRANSPORT NETWORKS | POLLINATION SERVICE | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Agriculture, ecosystems and environment : an international journal for scientific research on the relationship of agriculture and food production to the biosphere Vol.239 (2017), p.304–309, grafs.Resumen: Agricultural land management modifies ecosystem structure and functioning in natural landscapes. Pollinators are a key functional group that may suffer from such intensification. Here we evaluate how agricultural land management influences the diversity of pollen transported by pollinators and the pollination niche overlap among plants. We described pollen transport networks (which allow assessing the contribution of pollinators to the flow of pollen among plants) in agricultural and restored fragments in three sites representative of the pampas region of Argentina. We analyzed diversity of pollen transported by pollinators and the pollination niche overlap among plants in both types of fragments with general and generalized linear mixed models. The agricultural fragments were associated to increased diversity of transported pollen and pollination niche overlap among plants. Greater pollination niche overlap in agricultural fragments was associated with increased abundance of exotic plants. Our results indicate that agricultural intensification has significantly increased the diversity of pollen and the pollination niche overlap in natural communities by promoting exotic plants and generalized plantpollinator interactions. Strategies to encourage improvements in the quality of pollination in agroecosystems could range from controlling the levels of exotic species to mechanisms that promote increased diversity of native plants.
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Agricultural land management modifies ecosystem structure and functioning in natural landscapes.
Pollinators are a key functional group that may suffer from such intensification. Here we evaluate how agricultural land management influences the diversity of pollen transported by pollinators and the pollination niche overlap among plants. We described pollen transport networks (which allow assessing the contribution of pollinators to the flow of pollen among plants) in agricultural and restored fragments in three sites representative of the pampas region of Argentina. We analyzed diversity of pollen transported by pollinators and the pollination niche overlap among plants in both types of fragments with general and generalized linear mixed models. The agricultural fragments were associated to increased diversity of transported pollen and pollination niche overlap among plants. Greater pollination niche overlap in agricultural fragments was associated with increased abundance of exotic plants. Our results indicate that agricultural intensification has significantly increased the diversity of pollen and the pollination niche overlap in natural communities by promoting exotic plants and generalized plantpollinator interactions. Strategies to encourage improvements in the quality of pollination in agroecosystems could range from controlling the levels of exotic species to mechanisms that promote increased diversity of native plants.

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