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- Title
Exploring cyclic dominance of sockeye salmon with a predator-prey model.
- Authors
Guill, Christian; Carmack, Eddy; Drossel, Barbara; Post, John
- Abstract
We explain in an intuitive and detailed way a predator-prey model that generates cyclic dominance in Fraser River sockeye salmon. In contrast with usual predator-prey models, this model includes four distinct prey lines and thus a combination of continuous and discrete dynamics, reflecting the particular freshwater and marine life cycle features of sockeye salmon ( Oncorhynchus nerka) populations. The predator-prey interaction causing the oscillations takes place in the rearing lakes, rather than in the ocean. The values of most parameters of this model can be estimated from empirical data that are available for the large salmon-rearing lakes in the Fraser River basin. The mechanism that produces the oscillations in this model is compared with other mechanisms that can generate population oscillations, and we argue that predator-prey dynamics is the most likely mechanism to produce the observed patterns. We explain why the period of the oscillation is exactly 4 years, and we explore how the dynamical pattern is affected by changes in external conditions or by management decisions.
- Subjects
FRASER River (B.C.); SOCKEYE salmon; PREDATION; SPAWNING; LIFE cycles (Biology); MARINE fish development
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2014, Vol 71, Issue 7, p959
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2013-0441