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Biological Invasions

, Volume 10, Issue 1, pp 41–49 | Cite as

Resistance of an invasive gastropod to an indigenous trematode parasite in Lake Malawi

  • Martin J. Genner
  • Ellinor Michel
  • Jonathan A. Todd
Original Paper

Abstract

Successful establishment and spread of biological invaders may be promoted by the absence of population-regulating enemies such as pathogens, parasites or predators. This may come about when introduced taxa are missing enemies from their native habitats, or through immunity to enemies within invaded habitats. Here we provide field evidence that trematode parasites are absent in a highly invasive morph of the gastropod Melanoides tuberculata in Lake Malawi, and that the invasive morph is resistant to indigenous trematodes that castrate and induce gigantism in native M. tuberculata. Since helminth infections can strongly influence host population abundances in other host-parasite systems, this enemy release may have provided an advantage to the invasive morph in terms of reproductive capacity and survivorship.

Keywords

Biological invasion Enemy release Non-indigenous species Exotic species Fish parasites African lakes Thiaridae 

Notes

Acknowledgements

We thank the Department of Fisheries for support during our research programme. We also thank Alan Smith, Paul Nichols, Kate Jones and Tom Woolford for assistance surveying molluscs, Jan van Arkel for photography, and C. van Oosterhout and one anonymous reviewer for helpful comments. This work was primarily funded by European Commission Marie Curie Fellowship HPMF-CT-2000–79.

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • Martin J. Genner
    • 1
  • Ellinor Michel
    • 2
  • Jonathan A. Todd
    • 2
  1. 1.Department of Biological SciencesUniversity of HullHullUK
  2. 2.The Natural History MuseumLondonUK

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