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Original Research

Terrestrial invasions on sub-Antarctic Marion and Prince Edward Islands

Michelle Greve, Rabia Mathakutha, Christien Steyn, Steven L. Chown

Bothalia: African Biodiversity & Conservation; Vol 47, No 2 (2017), 21 pages. doi: 10.4102/abc.v47i2.2143

Submitted: 01 August 2016
Published:  31 March 2017

Abstract

Background: The sub-Antarctic Prince Edward Islands (PEIs), South Africa’s southernmost territories have high conservation value. Despite their isolation, several alien species have established and become invasive on the PEIs.
Objectives: Here we review the invasion ecology of the PEIs.
Methods: We summarise what is known about the introduction of alien species, what influences their ability to establish and spread, and review their impacts.
Results: Approximately 48 alien species are currently established on the PEIs, of which 26 are known to be invasive. Introduction pathways for the PEIs are fairly well understood – species have mainly been introduced with ship cargo and building material. Less is known about establishment, spread and impact of aliens. It has been estimated that less than 5% of the PEIs is covered by invasive plants, but invasive plants have attained circuminsular distributions on both PEIs. Studies on impact have primarily focussed on the effects of vertebrate invaders, of which the house mouse, which is restricted to Marion Island, probably has the greatest impact on the biodiversity of the islands. Because of the risk of alien introductions, strict biosecurity regulations govern activities at the PEIs. These are particularly aimed at stemming the introduction of alien species, and are likely to have reduced the rates of new introductions. In addition, some effort is currently being made to eradicate selected range-restricted species. However, only one species that had established and spread on the PEIs, the cat, has been successfully eradicated from the islands.
Conclusion: Given the ongoing threat of introductions, and the impacts of invaders, it is essential that future invasions to the PEIs are minimised, that the islands’ management policies deal with all stages of the invasion process and that a better understanding of the risks and impacts of invasions is obtained.

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Author affiliations

Michelle Greve, Department of Plant and Soil Sciences, University of Pretoria, South Africa
Rabia Mathakutha, Department of Plant and Soil Sciences, University of Pretoria, South Africa
Christien Steyn, Department of Plant and Soil Sciences, University of Pretoria, South Africa
Steven L. Chown, School of Biological Sciences, Monash University, Australia

Keywords

Alien; Establishment; Impact; Marion Island; Prince Edward Island; Transport

Metrics

Total abstract views: 500
Total article views: 1274  

Cited-By

1. Contributions to the National Status Report on Biological Invasions in South Africa
John R.U. Wilson, Mirijam Gaertner, David M. Richardson, Brian W. Van Wilgen
Bothalia  vol: 47  issue: 2  year: 2017  
doi: 10.4102/abc.v47i2.2207

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ISSN: 0006-8241 (print) | ISSN: 2311-9284 (online)

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