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Biological Invasions

, Volume 15, Issue 9, pp 2115–2125 | Cite as

Saving a tropical ecosystem from a destructive ant-scale (Pheidole megacephala, Pulvinaria urbicola) mutualism with support from a diverse natural enemy assemblage

  • R. Gaigher
  • M. J. Samways
  • S. Van Noort
Original Paper

Abstract

Ants can disrupt the natural biological control of serious hemipteran pests by interfering with natural enemies, resulting in a change in ecosystem functioning. We focus here on interference by a highly invasive ant Pheidole megacephala on the regulation of a tree destroying hemipteran scale insect Pulvinaria urbicola on Cousine Island in the Seychelles archipelago, a tropical island ecosystem. We show how a diverse natural enemy assemblage contributes substantially to the collapse of the ant-scale mutualism following managed ant suppression. Natural enemy abundance and species richness increased significantly after ant suppression, with varying responses among the different functional guilds. Primary parasitoids coexisted with tending ants before ant suppression, but could not regulate the enormously high scale densities alone. After ant suppression, a significant increase in predators caused a collapse of the scale population. Guilds external to the mutualism were also affected, with primary parasitoids of various non-hemipteran taxa also increasing, which contributed significantly to the recovery of the community to its pre-invasion composition. Our results highlight the far-reaching and pervasive effects of the hemipteran-tending invasive ant within the natural enemy assemblage. In turn, we also illustrate the potential to restore the tropical ecosystem by encouraging an array of natural enemies through precision management of the ant.

Keywords

Parasitoids Predators Invasive species Island restoration Pheidole megacephala Pulvinaria urbicola 

Notes

Acknowledgments

This work was funded by DST-NRF Centre of Excellence for Invasion Biology (CIB) and the Working for Water Programme through their collaborative research project on “Integrated Management of Invasive Alien Species”. Arthropod identifications were provided by G. Prinsloo, J. Gerlach and A. Dippenaar-Schoeman. D.G. Nel assisted with statistical analyses. Two anonymous referees provided constructive comments on the manuscript.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Department of Conservation Ecology and Entomology, and DST/NRF Centre of Excellence for Invasion BiologyStellenbosch UniversityMatielandSouth Africa
  2. 2.Natural History DepartmentIziko South African MuseumCape TownSouth Africa

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