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Quantifying site and species factors to inform the feasibility of eradication of alien plants from Southern Ocean Islands: Stellaria media on Macquarie Island

  • Laura K. WilliamsEmail author
  • Alexander J. Fergus
  • Justine D. Shaw
  • Aleks Terauds
  • Paul Kristiansen
  • Susan Caroline Wilson
  • Jane L. Gosden
  • Karen Ziegler
  • Brian M. Sindel
Original Paper
  • 19 Downloads

Abstract

Eradication of alien plants is notoriously challenging, however eradication projects reap great biodiversity benefits, particularly on islands. To date only individual plants or small restricted populations have been successfully eradicated from the Southern Ocean Islands (SOI). The next phase in conservation for the region is tackling more widespread, abundant alien plant species. Several on-going and proposed control programs for such weeds exist in the SOI and Antarctic regions. If eradication of a widespread species is to be successful, a number of factors need to be considered. ‘Organisational’ factors such as management agency capacity, resources and the availability of effective control methods are critical to the success of an eradication. ‘Site and species’ factors such as infestation extent, number of discrete populations, dispersal processes and detectability typically show a cumulative effect on success. We assessed the site and species factors for Stellaria media, an alien species on sub-Antarctic Macquarie Island, to determine the feasibility of its eradication from the island. Organisational factors can successfully be met with adequate funding. Site and species factors which reduce the likelihood of eradication included large gross infestation areas, large plants with high reproductive output (precocity or fecundity), dense seed banks, short pre-reproductive period, extended seed longevity and vegetative reproductive capacity. We recommend a small-scale eradication trial for restricted, easily accessible populations of S. media on Macquarie Island to further evaluate the likelihood of broader eradication.

Keywords

Invasive Non-native Eradication Control Protected area Sub-Antarctic 

Notes

Funding

Funding for this project was provided by The University of New England and the Australian Antarctic Division, project AAS 4341. Access to Macquarie Island was provided by the Tasmanian Parks and Wildlife Service and logistical support was provided by the Australian Antarctic Division, Department of the Environment and Energy.

Supplementary material

10530_2018_1880_MOESM1_ESM.jpg (3.6 mb)
Supplementary material 1 (JPEG 3704 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Laura K. Williams
    • 1
    Email author
  • Alexander J. Fergus
    • 1
    • 2
  • Justine D. Shaw
    • 3
  • Aleks Terauds
    • 4
  • Paul Kristiansen
    • 1
  • Susan Caroline Wilson
    • 1
  • Jane L. Gosden
    • 1
  • Karen Ziegler
    • 1
  • Brian M. Sindel
    • 1
  1. 1.School of Environmental and Rural ScienceThe University of New EnglandArmidaleAustralia
  2. 2.Manaaki Whenua – Landcare ResearchLincolnNew Zealand
  3. 3.Centre for Biodiversity and Conservation Science, School of Biological SciencesUniversity of QueenslandSt LuciaAustralia
  4. 4.Australian Antarctic DivisionKingstonAustralia

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