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Invasion of two exotic terrestrial flatworms to subantarctic Macquarie Island

Date

2007

Authors

Greenslade, Penelope
Stevens, Mark I
Edwards, Robert

Journal Title

Journal ISSN

Volume Title

Publisher

Springer

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 ∼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.

Description

Keywords

Keywords: flatworm; invasive species; range expansion; species occurrence; Australasia; Australia; Eurasia; Europe; Macquarie Island; New Zealand; Pacific islands; Pacific Ocean; Tasmania; United Kingdom; Western Europe; Arthurdendyus; Platyhelminthes Arthurdendyus vegrandis; Distribution; Earthworms; Invasive species; Kontikia andersoni; Predators; Quarantine

Citation

Source

Polar Biology

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1007/s00300-007-0254-6

Restricted until

2037-12-31