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Resource allocation in two species systems: Is it worth acknowledging species interactions?

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  • Probert, William J.M.
  • Drechsler, Martin
  • Baxter, Peter W.J.
  • Possingham, Hugh P.

Abstract

It is becoming increasingly popular to consider species interactions when managing ecological foodwebs. Such an approach is useful in determining how management can affect multiple species, with either beneficial or detrimental consequences. Identifying such actions is particularly valuable in the context of conservation decision making as funding is severely limited. This paper outlines a new approach that simplifies the resource allocation problem in a two species system for a range of species interactions: independent, mutualism, predator–prey, and competitive exclusion. We assume that both species are endangered and we do not account for decisions over time. We find that optimal funding allocation is to the conservation of the species with the highest marginal gain in expected probability of survival and that, across all except mutualist interaction types, optimal conservation funding allocation differs between species. Loss in efficiency from ignoring species interactions was most severe in predator–prey systems. The funding problem we address, where an ecosystem includes multiple threatened species, will only become more commonplace as increasing numbers of species worldwide become threatened.

Suggested Citation

  • Probert, William J.M. & Drechsler, Martin & Baxter, Peter W.J. & Possingham, Hugh P., 2011. "Resource allocation in two species systems: Is it worth acknowledging species interactions?," Ecological Modelling, Elsevier, vol. 222(10), pages 1781-1789.
    • Handle: RePEc:eee:ecomod:v:222:y:2011:i:10:p:1781-1789
    DOI: 10.1016/j.ecolmodel.2011.02.026
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    References listed on IDEAS

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    1. Wacker, Holger, 1999. "Optimal harvesting of mutualistic ecological systems," Resource and Energy Economics, Elsevier, vol. 21(1), pages 89-102, January.
    2. Tu, Pierre N. V. & Wilman, Elizabeth A., 1992. "A generalized predator- prey model: Uncertainty and management," Journal of Environmental Economics and Management, Elsevier, vol. 23(2), pages 123-138, September.
    3. Kerrie A. Wilson & Marissa F. McBride & Michael Bode & Hugh P. Possingham, 2006. "Prioritizing global conservation efforts," Nature, Nature, vol. 440(7082), pages 337-340, March.
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    Cited by:

    1. Surun, Clément & Drechsler, Martin, 2018. "Effectiveness of Tradable Permits for the Conservation of Metacommunities With Two Competing Species," Ecological Economics, Elsevier, vol. 147(C), pages 189-196.

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