A MODEL OF CHINOOK SALMON POPULATION DYNAMICS INCORPORATING SIZE-SELECTIVE EXPLOITATION AND INHERITANCE OF POLYGENIC CORRELATED TRAITS
Version of Record online: 28 OCT 2010
Copyright ©2010 Wiley Periodicals, Inc.
Natural Resource Modeling
Volume 24, Issue 1, pages 1–47, February 2011
How to Cite
BROMAGHIN, J. F., NIELSON, R. M. and HARD, J. J. (2011), A MODEL OF CHINOOK SALMON POPULATION DYNAMICS INCORPORATING SIZE-SELECTIVE EXPLOITATION AND INHERITANCE OF POLYGENIC CORRELATED TRAITS. Natural Resource Modeling, 24: 1–47. doi: 10.1111/j.1939-7445.2010.00077.x
- Issue online: 1 FEB 2011
- Version of Record online: 28 OCT 2010
- Received by the editors on 20th August, 2009. Accepted 1st August, 2010.
- Fishery-induced evolution;
- fishery-induced adaptation;
- selective fisheries;
- Oncorhynchus tshawytscha;
- fishery management;
- fishery conservation;
- individual-based model;
- age-structured model;
- Yukon River
Abstract Concern regarding the potential for selective fisheries to degrade desirable characteristics of exploited fish populations is growing worldwide. Although the occurrence of fishery-induced evolution in a wild population has not been irrefutably documented, considerable theoretical and empirical evidence for that possibility exists. Environmental conditions influence survival and growth in many species and may mask comparatively subtle trends induced by selective exploitation, especially given the evolutionarily short time series of data available from many fisheries. Modeling may be the most efficient investigative tool under such conditions. Motivated by public concern that large-mesh gillnet fisheries may be altering Chinook salmon in western Alaska, we constructed a stochastic model of the population dynamics of Chinook salmon. The model contained several individually based components and incorporated size-selective exploitation, assortative mating, size-dependent female fecundity, density-dependent survival, and the heritability of size and age. Substantial reductions in mean size and age were observed under all scenarios. Concurrently reducing directional selection and increasing spawning abundance was most effective in stimulating population recovery. Use of this model has potential to improve our ability to investigate the consequences of selective exploitation and aid development of improved management strategies to more effectively sustain fish and fisheries into the future.