Biological Invasions

, Volume 14, Issue 3, pp 557–565 | Cite as

Disruption of ant-seed dispersal mutualisms by the invasive Asian needle ant (Pachycondyla chinensis)

  • Mariano A. Rodriguez-Cabal
  • Katharine L. Stuble
  • Benoit Guénard
  • Robert R. Dunn
  • Nathan J. Sanders
Original Paper

Abstract

By disrupting the structure of native ant assemblages, invasive ants can have effects across trophic levels. Most studies to date, however, have focused on the impacts just two species (Linepithema humile and Solenopsis invicta). The impacts of many other invasive ant species on ecological processes in their introduced range are unknown. In this study we tested the hypothesis that the invasive ant Pachycondyla chinensis disrupts ant-seed dispersal mutualisms by displacing native ant species, especially the keystone mutualist Aphaenogaster rudis, while failing to disperse seeds itself. In a paired design we measured the impact of P. chinensis on the native ant-plant seed dispersal mutualism. The number of A. rudis workers was 96% lower in invaded than in intact plots, and the number of seeds removed was 70% lower in these plots. Finally, in invaded plots the abundance of Hexastylis arifolia, a locally abundant myrmecochorous plant, was 50% lower than in plots where P. chinensis was absent. A parsimonious interpretation of our results is that P. chinensis causes precipitous declines in the abundance of A. rudis within invaded communities, thereby disrupting the ant-plant seed dispersal mutualisms and reducing abundances of ant-dispersed plants. In sum, the magnitude of the effects of P. chinensis on seed dispersal is quantitatively similar to that documented for the intensively studied invasive Argentine ant. We suggest that more studies on the impacts of less-studied invasive ant species on seed dispersal mutualisms may increase our knowledge of the effects of these invaders on ecosystem function.

Keywords

Aphaenogaster rudis Exotic species Hexastylis arifolia Myrmecochory Seed-dispersal mutualisms 

Notes

Acknowledgments

We thank Historic Yates Mill County Park for permission to carry out field work and G. L. McCormick and J. E. Canner for assistance in the field. M. N. Barrios-Garcia, J. A. Schweitzer, J. K. Bailey and M. A. Nuñez provided advice that greatly improved this manuscript. This research was funded by the Department of Ecology and Evolutionary Biology at the University of Tennessee.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Mariano A. Rodriguez-Cabal
    • 1
  • Katharine L. Stuble
    • 1
  • Benoit Guénard
    • 2
  • Robert R. Dunn
    • 2
  • Nathan J. Sanders
    • 1
  1. 1.Department of Ecology and Evolutionary BiologyUniversity of TennesseeKnoxvilleUSA
  2. 2.Department of BiologyNorth Carolina State UniversityRaleighUSA

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