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Allocating biosecurity resources between preventing, detecting, and eradicating island invasions

  • Rout, Tracy M.
  • Moore, Joslin L.
  • Possingham, Hugh P.
  • McCarthy, Michael A.
Registered author(s):

    Finding efficient ways to manage the threat of invasive species helps make the most of limited resources. Different management actions reduce the impact of invasions differently: preventing invasion eliminates impacts entirely, surveillance can facilitate early detection and eradication, and removing individuals can reduce future impact. Few studies have examined the trade-off between all three facets of invasion management. Using a simple model of island invasion, we find how resources should be allocated to each action to minimise the total cost of management and impact. We use a case study of black rat (Rattus rattus) invasion on Barrow Island, Western Australia. The optimal amount to invest in each management action depends on the effectiveness of each action, and the magnitude of impact caused by different stages of invasion. If the pest is currently absent, it is more cost-effective to prevent impacts through prevention or surveillance. If the pest is already widespread, it can sometimes be cost-effective to give up rather than attempting eradication. This model of invasion can provide useful decision support by identifying the trade-offs inherent in each candidate management strategy, the thresholds that alter optimal strategies, and the parameters for which we need more information.

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    File URL: http://www.sciencedirect.com/science/article/pii/S0921800911003855
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    Article provided by Elsevier in its journal Ecological Economics.

    Volume (Year): 71 (2011)
    Issue (Month): C ()
    Pages: 54-62

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    Handle: RePEc:eee:ecolec:v:71:y:2011:i:c:p:54-62
    Contact details of provider: Web page: http://www.elsevier.com/locate/ecolecon

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    1. Lars J. Olson & Santanu Roy, 2005. "On Prevention and Control of an Uncertain Biological Invasion ," Review of Agricultural Economics, Agricultural and Applied Economics Association, vol. 27(3), pages 491-497.
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    4. Ludwig,D. & Brock,W.A. & Carpenter,S.R., 2005. "Uncertainty in discount models and environmental cccounting," Working papers 15, Wisconsin Madison - Social Systems.
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    6. Mehta, Shefali V. & Haight, Robert G. & Homans, Frances R. & Polasky, Stephen & Venette, Robert C., 2007. "Optimal detection and control strategies for invasive species management," Ecological Economics, Elsevier, vol. 61(2-3), pages 237-245, March.
    7. Carrasco, L.R. & Mumford, J.D. & MacLeod, A. & Knight, J.D. & Baker, R.H.A., 2010. "Comprehensive bioeconomic modelling of multiple harmful non-indigenous species," Ecological Economics, Elsevier, vol. 69(6), pages 1303-1312, April.
    8. Finnoff, David & Shogren, Jason F. & Leung, Brian & Lodge, David, 2007. "Take a risk: Preferring prevention over control of biological invaders," Ecological Economics, Elsevier, vol. 62(2), pages 216-222, April.
    9. Kristin Jakobsson & Andrew Dragun, 2001. "The Worth of a Possum: Valuing Species with the Contingent Valuation Method," Environmental & Resource Economics, European Association of Environmental and Resource Economists, vol. 19(3), pages 211-227, July.
    10. Sumaila, Ussif R. & Walters, Carl, 2005. "Intergenerational discounting: a new intuitive approach," Ecological Economics, Elsevier, vol. 52(2), pages 135-142, January.
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    13. Richard Bellman, 1957. "On a Dynamic Programming Approach to the Caterer Problem--I," Management Science, INFORMS, vol. 3(3), pages 270-278, April.
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