Polar Biology

, 30:961 | Cite as

Invasion of two exotic terrestrial flatworms to subantarctic Macquarie Island

  • Penelope Greenslade
  • Mark I. Stevens
  • Robert Edwards
Original Paper

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.

Keywords

Arthurdendyus vegrandis Kontikia andersoni Invasive species Distribution Quarantine Earthworms Predators 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Penelope Greenslade
    • 1
  • Mark I. Stevens
    • 2
    • 3
  • Robert Edwards
    • 1
  1. 1.Department of Botany and ZoologyAustralian National UniversityAustralian Capital TerritoryAustralia
  2. 2.Allan Wilson Centre for Molecular Ecology and EvolutionMassey UniversityPalmerston NorthNew Zealand
  3. 3.School of Biological SciencesMonash UniversityClayton, VictoriaAustralia

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