Abstract
Invasive species are a serious threat to biodiversity worldwide. The relatively simple ecological systems of the subantarctic have the potential to be significantly damaged by predatory species that invade. Two species of exotic, predatory, terrestrial flatworms were first collected in 1997 from two localities only 2 km apart, in the southeast of subantarctic Macquarie Island. The species were later identified as Kontikia andersoni and Arthurdendyus vegrandis. We report here the results of fieldwork in 2004 that established that both species now occupy about a seventh of the southeast of the island which has a total area of only 170 km2 and that there seem to be no barriers to further expansion. The island was first discovered in 1810 and so it is likely the species were introduced by means of human intervention within the last 200 years. We provide evidence to show that both species originated in New Zealand and have probably been on the island for ∼100 years giving an average rate of spread of about 10 m per year. Other species of Arthurdendyus have been introduced from New Zealand to the United Kingdom where they prey on earthworms. The quarantine significance of A. vegrandis for Australia is discussed and recommendations made to reduce the probability of it entering Tasmania where it has the potential to become an agricultural pest.
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Acknowledgments
We are very grateful to David Smith, Richard Koch, and Richard Carter for assistance with the mapping, and Noel Carmichael and the 56th ANARE 2003/2004 staff on Macquarie Island for field support. We thank the Antarctic Science Advisory Committee for funding (grants 2355 and 2397 to Paul Sunnucks) and to the Australian Antarctic Division for logistical support. Leigh Winsor provided us with identification and guidelines for preservation of specimens, and Paul Sunnucks, Cheryl Grgurinovic and three anonymous reviewers made helpful comments on the manuscript.
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Greenslade, P., Stevens, M.I. & Edwards, R. Invasion of two exotic terrestrial flatworms to subantarctic Macquarie Island. Polar Biol 30, 961–967 (2007). https://doi.org/10.1007/s00300-007-0254-6
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DOI: https://doi.org/10.1007/s00300-007-0254-6