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Simple dynamics underlie sockeye salmon (oncorhynchus nerka) cycles

Myers, Ransom A. and Mertz, Gordon and Bridson, Jessica M. and Bradford, Michael J. (1998) Simple dynamics underlie sockeye salmon (oncorhynchus nerka) cycles. Canadian Journal of Fisheries and Aquatic Sciences, 55 (10). pp. 2355-2364. ISSN 1205-7533

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A variety of mechanisms have been proposed to explain the renowned British Columbia sockeye salmon (Oncorhynchus nerka) cycles, most of which invoke between-brood interactions (delayed density dependence) or depensatory harvest practices. We examine the dynamics of the Ricker model with realistic parameter values and suggest that the cycles could result from a stable mode excited by stochastic forcing. The previously proposed mechanisms are not required to generate cyclic patterns, although they could play a role in reinforcing cycles. Our results suggest that relaxing harvest rates will increase yields and decrease variability in sockeye abundances.

Item type: Article
ID code: 60
Notes: Copyright NRC Canada 1998
Keywords: sockeye salmon, fisheries, ricker model, statistical modelling, Statistics, Oceanography, Ecology, Evolution, Behavior and Systematics, Aquatic Science
Subjects: Social Sciences > Statistics
Geography. Anthropology. Recreation > Oceanography
Department: Faculty of Science > Mathematics and Statistics > Statistics and Modelling Science
Depositing user: Mr Derek Boyle
Date Deposited: 21 Dec 2005
Last modified: 20 Oct 2015 11:29

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