Estimating delayed density-dependent mortality in sockeye salmon (oncorhynchus nerka) : a meta-analytic approach
Myers, Ransom A. and Bradford, Michael J. and Bridson, Jessica M. and Mertz, Gordon (1997) Estimating delayed density-dependent mortality in sockeye salmon (oncorhynchus nerka) : a meta-analytic approach. Canadian Journal of Fisheries and Aquatic Sciences, 54 (10). pp. 2449-2462. ISSN 1205-7533 (https://doi.org/10.1139/f97-146)
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Abstract
Delayed density-dependent mortality can be a cause of the cyclic patterns in abundance observed in many populations of sockeye salmon (Oncorhynchus nerka). We used a meta-analytical approach to test for delayed density dependence using 34 time series of sockeye data. We found no consistent evidence for delayed density-dependent mortality using spawner - spring fry or spawner-recruit data. We did find evidence for delayed density-dependent mortality at a 1 year lag for the spawner - fall fry and the spawner-smolt data; however, effects at lags greater than 1 year were weak and not statistically significant. Between-cohort interactions at a 1-year lag are not sufficient to cause the observed cycles in adult abundance, although they will tend to reinforce patterns established by other mechanisms. Our results imply that reductions in fishing mortality in off-peak years should result in an increase in abundance.
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Item type: Article ID code: 62 Dates: DateEventOctober 1997PublishedNotes: Copyright NRC Canada 1997. Subjects: Social Sciences > Statistics
Geography. Anthropology. Recreation > OceanographyDepartment: Faculty of Science > Mathematics and Statistics > Statistics and Modelling Science Depositing user: Mr Derek Boyle Date deposited: 21 Dec 2005 Last modified: 27 Jun 2024 00:59 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/62