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Recovery of indigenous butterfly community following control of invasive alien plants in a tropical island’s wet forests

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Abstract

Invasive alien species pose one of the highest threats to biodiversity, especially in isolated oceanic islands where high rates of both endemism and extinction risk also usually prevail. Few studies have investigated the impact of invasive alien plants on butterflies in insular ecosystems, despite butterflies representing a key indicator group for terrestrial arthropod diversity. Using the Pollard Technique, we quantified butterfly species richness and abundance in eight wet lowland forest areas invaded by alien plants, principally the strawberry guava (Psidium cattleianum Sabine) on the tropical volcanic island of Mauritius, and compared the results with paired adjacent forest plots that had been weeded of alien plants between 2 and 12 years previously. Butterfly assemblages in weed-infested and weeded forests were distinctly different with higher species richness and much higher butterfly abundance in the latter. At least some of these differences seemed attributable to weed removal effects on forest structure, but understanding the precise mechanisms involved will require further study. The results suggest that alien plant invasion may have contributed to the extinction of certain endemic taxa and can increase the likelihood of butterfly species extinction by reducing population sizes through reduced habitat quality. Such a shift in a forest’s butterfly assemblage is likely to have negative effects on both their indigenous predators and the plants they pollinate. It is argued that in order to maintain butterfly and other arthropod diversity and function in these forests, alien plant control must be maintained and extended beyond the current 1% of surviving forest remnants.

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Abbreviations

asl:

Above sea level

CMA:

Conservation Management Area

dbh:

Diameter at breast height

IUCN:

International Union for the Conservation of Nature

km:

Kilometre

m:

Metre

M:

Million

mm:

Millimetre

MY:

Million years

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Acknowledgments

We thank the National Parks and Conservation Service of Mauritius for giving access to study sites and Malika Virah Sawmy, Jean-Claude Sevathian and John Williams for varied assistance. Clare Towner-Mauremootoo helped in the field. Jon Sullivan, Dominique Strasberg, Jean-Yves Meyer, Steven Goodman, Pierre-Michel Forget and two anonymous reviewers provided useful comments to improve this paper. A British Ecological Society’s Overseas Bursary awarded to the first author enabled the survey of plant communities.

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Authors and Affiliations

  1. UMR PVBMT (Peuplements Végétaux et Bioagresseurs en Milieu Tropical), Université de la Réunion, 15, Avenue René Cassin, BP 7151, 97715, St Denis, La Réunion, France

    F. B. Vincent Florens

  2. Department of Biosciences, University of Mauritius, Réduit, Mauritius

    F. B. Vincent Florens

  3. Mauritian Wildlife Foundation, La Preneuse, Mauritius

    John R. Mauremootoo

  4. BioNET-INTERNATIONAL Secretariat, Bakeham Lane, Egham, Surrey, TW20 9TY, UK

    John R. Mauremootoo

  5. Manaaki Whenua Landcare Research, PO Box 40, Lincoln, 7640, New Zealand

    Simon V. Fowler

  6. Research and Knowledge Transfer, Innovation Centre, Rennes Drive, University of Exeter, Exeter, Devon, UK

    Linton Winder

  7. Mauritius Herbarium, MSIRI, Réduit, Mauritius

    Cláudia Baider

Authors
  1. F. B. Vincent Florens
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  2. John R. Mauremootoo
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  3. Simon V. Fowler
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  4. Linton Winder
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  5. Cláudia Baider
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Correspondence to F. B. Vincent Florens.

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Florens, F.B.V., Mauremootoo, J.R., Fowler, S.V. et al. Recovery of indigenous butterfly community following control of invasive alien plants in a tropical island’s wet forests. Biodivers Conserv 19, 3835–3848 (2010). https://doi.org/10.1007/s10531-010-9930-x

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  • DOI: https://doi.org/10.1007/s10531-010-9930-x

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