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Oecologia

, Volume 155, Issue 4, pp 761–770 | Cite as

Contrasting effects of invasive plants in plant–pollinator networks

  • Ignasi Bartomeus
  • Montserrat Vilà
  • Luís Santamaría
Plant-Animal Interactions - Original Paper

Abstract

The structural organization of mutualism networks, typified by interspecific positive interactions, is important to maintain community diversity. However, there is little information available about the effect of introduced species on the structure of such networks. We compared uninvaded and invaded ecological communities, to examine how two species of invasive plants with large and showy flowers (Carpobrotus affine acinaciformis and Opuntia stricta) affect the structure of Mediterranean plant–pollinator networks. To attribute differences in pollination to the direct presence of the invasive species, areas were surveyed that contained similar native plant species cover, diversity and floral composition, with or without the invaders. Both invasive plant species received significantly more pollinator visits than any native species and invaders interacted strongly with pollinators. Overall, the pollinator community richness was similar in invaded and uninvaded plots, and only a few generalist pollinators visited invasive species exclusively. Invasive plants acted as pollination super generalists. The two species studied were visited by 43% and 31% of the total insect taxa in the community, respectively, suggesting they play a central role in the plant–pollinator networks. Carpobrotus and Opuntia had contrasting effects on pollinator visitation rates to native plants: Carpobrotus facilitated the visit of pollinators to native species, whereas Opuntia competed for pollinators with native species, increasing the nestedness of the plant–pollinator network. These results indicate that the introduction of a new species to a community can have important consequences for the structure of the plant–pollinator network.

Keywords

Carpobrotus affine acinaciformis Ecological networks Generalization Interaction strength Invasive species 

Notes

Acknowledgements

We thank J. Bosch for insect identification supervision, L. Marco for the field assistance; and J. Bascompte, P. Jordano, A. Valido, K. Gross and three anonymous reviewers for comments on a previous version of the manuscript. Partial research support was provided by the Integrated European Project Assessing Large Scale Risks to Biodiversity with Tested Methods (ALARM: http://www.alarmproject.net), contract 506675 and the Ministerio de Ciencia y Tecnología projects Efecto de las Especies Invasoras en las Redes de Polinización (INVASRED) and Determinantes Biológicos del Riesgo de Invasiones Vegetales (RINVE). This work complies with the current laws of Spain.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Ignasi Bartomeus
    • 1
  • Montserrat Vilà
    • 2
  • Luís Santamaría
    • 3
  1. 1.Center for Ecological Research and Forestry Applications (CREAF), Edifici CUniversitat Autònoma de BarcelonaBellaterra, BarcelonaSpain
  2. 2.Estación Biológica de Doñana, Centro Superior de Investigaciones Científicas (EDB-CSIC)SevillaSpain
  3. 3.Institut Mediterrani d’ Estudis Avançats (IMEDEA)EsporlesSpain

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