Management of plant invasions mediated by frugivore interactions

Authors

  • YVONNE M. BUCKLEY,

    1. The Ecology Centre, University of Queensland, School of Integrative Biology, St Lucia, Queensland 4072, Australia;
    2. CSIRO Sustainable Ecosystems, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia, Queensland 4067, Australia;
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  • SANDRA ANDERSON,

    1. School of Geography and Environmental Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand;
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  • CARLA P. CATTERALL,

    1. Environmental Sciences, Griffith University, Nathan, Queensland 4111, Australia;
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  • RICHARD T. CORLETT,

    1. Department of Ecology and Biodiversity, University of Hong Kong, Pokfulam Road, Hong Kong, China;
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  • THOMAS ENGEL,

    1. Biogeography, University of Bayreuth, 95440 Bayreuth, Germany;
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  • CARL R. GOSPER,

    1. CRC for Australian Weed Management, Alan Fletcher Research Station, Queensland Department of Natural Resources and Mines, PO Box 36, Sherwood, Queensland 4075, Australia;
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  • RAN NATHAN,

    1. Movement Ecology Laboratory, Department of Evolution, Systematics and Ecology, The Hebrew University of Jerusalem, Givat Ram, 91904 Jerusalem, Israel;
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  • DAVID M. RICHARDSON,

    1. Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;
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  • MELISSA SETTER,

    1. Queensland Department of Natural Resources and Mines, Centre for Wet Tropics Agriculture, PO Box 20, South Johnstone, Queensland 4859, Australia;
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  • ORR SPIEGEL,

    1. Movement Ecology Laboratory, Department of Evolution, Systematics and Ecology, The Hebrew University of Jerusalem, Givat Ram, 91904 Jerusalem, Israel;
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  • GABRIELLE VIVIAN-SMITH,

    1. CRC for Australian Weed Management, Alan Fletcher Research Station, Queensland Department of Natural Resources and Mines, PO Box 36, Sherwood, Queensland 4075, Australia;
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  • FRIEDERIKE A. VOIGT,

    1. School of Biological and Conservation Science, University Natal, Private Bag X01, Scottsville, Pietermaritzburg, 3209 South Africa; and
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  • JACQUELINE E. S. WEIR,

    1. Department of Ecology and Biodiversity, University of Hong Kong, Pokfulam Road, Hong Kong, China;
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  • DAVID A. WESTCOTT

    1. CSIRO Sustainable Ecosystems, the Rainforest CRC and the CRC for Australian Weed Management, Atherton, Queensland 4883, Australia
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Yvonne M. Buckley, The Ecology Centre, University of Queensland, School of Integrative Biology, St Lucia, Queensland 4072, Australia (e-mail y.buckley@uq.edu.au).

Summary

  • 1Some of the most damaging invasive plants are dispersed by frugivores and this is an area of emerging importance in weed management. It highlights the need for practical information on how frugivores affect weed population dynamics and spread, how frugivore populations are affected by weeds and what management recommendations are available.
  • 2Fruit traits influence frugivore choice. Fruit size, the presence of an inedible peel, defensive chemistry, crop size and phenology may all be useful traits for consideration in screening and eradication programmes. By considering the effect of these traits on the probability, quality and quantity of seed dispersal, it may be possible to rank invasive species by their desirability to frugivores. Fruit traits can also be manipulated with biocontrol agents.
  • 3Functional groups of frugivores can be assembled according to broad species groupings, and further refined according to size, gape size, pre- and post-ingestion processing techniques and movement patterns, to predict dispersal and establishment patterns for plant introductions.
  • 4Landscape fragmentation can increase frugivore dispersal of invasives, as many invasive plants and dispersers readily use disturbed matrix environments and fragment edges. Dispersal to particular landscape features, such as perches and edges, can be manipulated to function as seed sinks if control measures are concentrated in these areas.
  • 5Where invasive plants comprise part of the diet of native frugivores, there may be a conservation conflict between control of the invasive and maintaining populations of the native frugivore, especially where other threats such as habitat destruction have reduced populations of native fruit species.
  • 6 Synthesis and applications. Development of functional groups of frugivore-dispersed invasive plants and dispersers will enable us to develop predictions for novel dispersal interactions at both population and community scales. Increasingly sophisticated mechanistic seed dispersal models combined with spatially explicit simulations show much promise for providing weed managers with the information they need to develop strategies for surveying, eradicating and managing plant invasions. Possible conservation conflicts mean that understanding the nature of the invasive plant–frugivore interaction is essential for determining appropriate management.

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