Indirect effects of invasive species removal devastate World Heritage Island
Bergstrom, DM and Lucieer, A and Kiefer, K and Wasley, J and Belbin, L and Pedersen, TK and Chown, SL (2009) Indirect effects of invasive species removal devastate World Heritage Island. Journal of Applied Ecology, 46 (1). pp. 73-81. ISSN 1365-2664
Official URL: http://dx.doi.org/10.1111/j.1365-2664.2008.01601.x
Owing to the detrimental impacts of invasive alien species, their control is often a priority for conservation management. Whereas the potential for unforeseen consequences of management is recognized, their associated complexity and costs are less widely appreciated.
We demonstrate that theoretically plausible trophic cascades associated with invasive species removal not only take place in reality, but can also result in rapid and drastic landscape-wide changes to ecosystems.
Using a combination of population data from of an invasive herbivore, plot-scale vegetation analyses, and satellite imagery, we show how a management intervention to eradicate a mesopredator has inadvertently and rapidly precipitated landscape-wide change on sub-Antarctic Macquarie Island. This happened despite the eradication being positioned within an integrated pest management framework. Following eradication of cats Felis catus in 2001, rabbit Oryctolagus cuniculus numbers increased substantially although a control action was in place (Myxoma virus), resulting in island-wide ecosystem effects.
Synthesis and applications. Our results highlight an important lesson for conservation agencies working to eradicate invasive species globally; that is, risk assessment of management interventions must explicitly consider and plan for their indirect effects, or face substantial subsequent costs. On Macquarie Island, the cost of further conservation action will exceed AU$24 million.
|Additional Information:||The original publication is available at
|Keywords:||invasive species • cats • rabbits • sub-Antarctic • trophic cascade|
|Deposited By:||Dr Arko Lucieer|
|Deposited On:||24 Feb 2009 12:10|
|Last Modified:||11 Mar 2009 15:25|
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