The compensatory potential of increased immigration following intensive American mink population control is diluted by male-biased dispersal

M. K. Oliver, S. B. Piertney, A. Zalewski, Y. Melero, X. Lambin

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Abstract

Attempts to mitigate the impact of invasive species on native ecosystems increasingly target large land masses where control, rather than eradication, is the management objective. Depressing numbers of invasive species to a level where their impact on native biodiversity is tolerable requires overcoming the impact of compensatory immigration from non-controlled portions of the landscape. Because of the expected scale-dependency of dispersal, the overall size of invasive species management areas relative to the dispersal ability of the controlled species will determine the size of any effectively conserved core area unaffected by immigration from surrounding areas. However, when dispersal is male-biased, as in many mammalian invasive carnivores, males may be overrepresented amongst immigrants, reducing the potential growth rate of invasive species populations in re-invaded areas. Using data collected from a project that gradually imposed spatially comprehensive control on invasive American mink (Neovison vison) over a 10,000 km2 area of NE Scotland, we show that mink captures were reduced to almost zero in 3 years, whilst there was a threefold increase in the proportion of male immigrants. Dispersal was often long distance and linking adjacent river catchments, asymptoting at 38 and 31 km for males and females respectively. Breeding and dispersal were spatially heterogeneous, with 40 % of river sections accounting for most captures of juvenile (85 %), adult female (65 %) and immigrant (57 %) mink. Concentrating control effort on such areas, so as to turn them into “attractive dispersal sinks” could make a disproportionate contribution to the management of recurrent re-invasion of mainland invasive species management areas.
Original languageEnglish
Pages (from-to)3047-3061
Number of pages15
JournalBiological Invasions
Volume18
Issue number10
Early online date1 Jul 2016
DOIs
Publication statusPublished - Oct 2016

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Neovison vison
immigration
invasive species
mink
rivers
concentrating
carnivores
Scotland
carnivore
river
biodiversity
breeding
catchment
ecosystems
ecosystem

Keywords

  • Mink
  • Control
  • Compensation
  • Immigration
  • Dispersal
  • Hotspots

Cite this

The compensatory potential of increased immigration following intensive American mink population control is diluted by male-biased dispersal. / Oliver, M. K.; Piertney, S. B.; Zalewski, A.; Melero, Y.; Lambin, X.

In: Biological Invasions, Vol. 18, No. 10, 10.2016, p. 3047-3061.

Research output: Contribution to journalArticle

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abstract = "Attempts to mitigate the impact of invasive species on native ecosystems increasingly target large land masses where control, rather than eradication, is the management objective. Depressing numbers of invasive species to a level where their impact on native biodiversity is tolerable requires overcoming the impact of compensatory immigration from non-controlled portions of the landscape. Because of the expected scale-dependency of dispersal, the overall size of invasive species management areas relative to the dispersal ability of the controlled species will determine the size of any effectively conserved core area unaffected by immigration from surrounding areas. However, when dispersal is male-biased, as in many mammalian invasive carnivores, males may be overrepresented amongst immigrants, reducing the potential growth rate of invasive species populations in re-invaded areas. Using data collected from a project that gradually imposed spatially comprehensive control on invasive American mink (Neovison vison) over a 10,000 km2 area of NE Scotland, we show that mink captures were reduced to almost zero in 3 years, whilst there was a threefold increase in the proportion of male immigrants. Dispersal was often long distance and linking adjacent river catchments, asymptoting at 38 and 31 km for males and females respectively. Breeding and dispersal were spatially heterogeneous, with 40 {\%} of river sections accounting for most captures of juvenile (85 {\%}), adult female (65 {\%}) and immigrant (57 {\%}) mink. Concentrating control effort on such areas, so as to turn them into “attractive dispersal sinks” could make a disproportionate contribution to the management of recurrent re-invasion of mainland invasive species management areas.",
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note = "Acknowledgments This research was funded by NERC Grants NE/J01396X/1; NE/E006434/1 to XL. Y. M. was funded by a Marie Curie FP7-PEOPLE-2011-IEF 300288. We profusely thank the Scottish Mink Initiative, staff, funders and multiple mink volunteers for the continued effort, samples and enthusiasm. The Scottish Water Vole Conservation Project was funded by The Tubney Charitable trust, Scottish Natural Heritage, the Cairngorms National Park Authority and the People’s Trust for Endangered Species. We also thank the Associate Editor and two anonymous referees for their thoughtful reviews.",
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N1 - Acknowledgments This research was funded by NERC Grants NE/J01396X/1; NE/E006434/1 to XL. Y. M. was funded by a Marie Curie FP7-PEOPLE-2011-IEF 300288. We profusely thank the Scottish Mink Initiative, staff, funders and multiple mink volunteers for the continued effort, samples and enthusiasm. The Scottish Water Vole Conservation Project was funded by The Tubney Charitable trust, Scottish Natural Heritage, the Cairngorms National Park Authority and the People’s Trust for Endangered Species. We also thank the Associate Editor and two anonymous referees for their thoughtful reviews.

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