Biodiversity and Conservation

, Volume 19, Issue 1, pp 257–274 | Cite as

Effects of anthropogenic habitat disturbance on local pollinator diversity and species turnover across a precipitation gradient

  • Carolina Quintero
  • Carolina Laura Morales
  • Marcelo Adrián Aizen
Original Paper

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.

Keywords

α Diversity Bees β Diversity Habitat alteration Homogenization Landscape Pollinators Rarefaction 

Notes

Acknowledgments

We are indebted to A. Roig and G. Clapps for help on bee identification and for valuable bibliography on Diptera identification. We thank C. Nufio, Y. Linhart, M. D. Bowers, and two anonymous reviewers for their useful comments on an earlier version of this paper, and J. Paritsis for designing the map used in Fig. 1. We also thank the National Park Administration for authorizing field work in the Nahuel Huapi NP. Funding was provided by The Canon National Park Science Scholars Program for the Americas. CLM and MAA are members of Research Career of the National Research Council of Argentina (CONICET).

Supplementary material

10531_2009_9720_MOESM1_ESM.doc (64 kb)
Supplementary material 1 (DOC 64 kb)

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Carolina Quintero
    • 1
    • 2
  • Carolina Laura Morales
    • 1
  • Marcelo Adrián Aizen
    • 1
  1. 1.Laboratorio Ecotono, Instituto de Investigaciones en Biodiversidad y Medio AmbienteUniversidad Nacional del Comahue - CONICETBariloche, Río NegroArgentina
  2. 2.Department of Ecology and Evolutionary BiologyUniversity of ColoradoBoulderUSA

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