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Sustainability indices for exploited populations
Authors:E. J. Milner-Gulland,H. Resit Ak  akaya
Affiliation:a Dept of Environmental Science and Technology, Imperial College London, Prince Consort Road, London, UK SW7 2BP;b Applied Biomathematics, 100 North Country Road, Setauket, NY 11733, USA
Abstract:
Evaluating the sustainability of hunting is key to the conservation of species exploited for bushmeat. Researchers are often hampered by a lack of basic biological data, the usual response to which is to develop sustainability indices based on highly simplified population models. However, the standard indices in the bushmeat literature do not perform well under realistic conditions of uncertainty, bias in parameter estimation, and habitat loss. Another possible approach to estimating the sustainability of hunting under uncertainty is to use Bayesian statistics, but this is mathematically demanding. Red listing of threatened species has to be carried out in extremely data-poor situations: uncertainty has been incorporated into this process in a relatively simple and intuitive way using fuzzy numbers. The current methods for estimating sustainability of bushmeat hunting also do not incorporate spatial heterogeneity. No-take areas are one management tool that can address uncertainty in a spatially explicit way.
Keywords:bushmeat   hunting   population models   fuzzy numbers   precautionary principle   no-take areas   sustainability   spatial heterogeneity   red lists   conservation
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