Effects of anthropogenic habitat disturbance on local pollinator diversity and species turnover across a precipitation gradient |
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Authors: | Carolina Quintero Carolina Laura Morales Marcelo Adrián Aizen |
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Institution: | 1.Laboratorio Ecotono, Instituto de Investigaciones en Biodiversidad y Medio Ambiente,Universidad Nacional del Comahue - CONICET,Bariloche, Río Negro,Argentina;2.Department of Ecology and Evolutionary Biology,University of Colorado,Boulder,USA |
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Abstract: | Anthropogenic habitat disturbance can have profound effects on multiple components of forest biotas including pollinator assemblages.
We assessed the effect of small-scale disturbance on local richness, abundance, diversity and evenness of insect pollinator
fauna; and how habitat disturbance affected species turnover across the landscape and overall diversity along a precipitation
gradient in NW Patagonia (Argentina). We evaluated the effect of disturbance on overall pollinator fauna and then separately
for bees (i.e. Apoidea) and non-bee pollinators. Locally, disturbed habitats had significantly higher pollinator species richness
and abundances than undisturbed habitats for the whole pollinator assemblage, but not for bees or non-bees separately. However,
significant differences in species richness between habitats vanished after accounting for differences in abundance between
habitat types. At a local scale Shannon–Weaver diversity and evenness did not vary with disturbance. A β diversity index indicated
that, across forest types, species turnover was lower between disturbed habitats than between undisturbed habitats. In addition,
rarefaction curves showed that disturbed habitats as a whole accumulated fewer species than undisturbed habitats at equivalent
sample sizes. We concluded that small patches of disturbed habitat have a negligible effect on local pollinator diversity;
however, habitat disturbance reduced β diversity through a homogenization of the pollinator fauna (in particular of bees)
across the landscape. |
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