Picture of Open Access badges

Discover Open Access research at Strathprints

It's International Open Access Week, 24-30 October 2016. This year's theme is "Open in Action" and is all about taking meaningful steps towards opening up research and scholarship. The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Explore recent world leading Open Access research content by University of Strathclyde researchers and see how Strathclyde researchers are committing to putting "Open in Action".


Image: h_pampel, CC-BY

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

[img] PDF (strathprints000062.pdf)
Restricted to Registered users only

Download (608kB) | Request a copy from the Strathclyde author


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.