|
|
|
|
| |
|
| |
|
| |
|
|
| Lessard, Robert B; University of Alberta; bob.lessard@ualberta.ca; Martell, Steven J. D.; University of British Columbia; s.martell@fisheries.ubc.ca; Walters, Carl J; University of British Columbia; c.walters@fisheries.ubc.ca; Essington, Timothy E; University of Washington; essing@u.washington.edu; Kitchell, James F; Center for Limnology, University of Wisconsin; kitchell@mhub.limnology.wisc.edu. |
| We review four case studies in which there is a risk of extinction or severe reduction in highly valued species if we ignore either, or both, of two ecosystem control options. “Symptomatic control” implies direct control of extinction risk through direct harvesting or culling of competitors and predators. “Systemic control” implies treating the causes of the problem that led to an unnaturally high abundance in the first place. We demonstrate, with a discussion of historically observed population trends, how surprising trophic interactions can emerge as a result of alterations to a system. Simulation models were developed for two of the case studies as aids to adaptive policy design, to expose possible abundance... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Ecosystem management; Predator control; Trophic interactions. |
| Ano: 2005 |
|
| |
|
|
|
