Journal Article

Revisiting the influences of parent stock, temperature, and predation on the recruitment of the Northeast Arctic cod stock, 1930–1990

John Pope, Philip Large and Tore Jakobsen

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 58, issue 5, pages 967-972
Published in print January 2001 | ISSN: 1054-3139
Published online January 2001 | e-ISSN: 1095-9289 | DOI: https://dx.doi.org/10.1006/jmsc.2001.1100
Revisiting the influences of parent stock, temperature, and predation on the recruitment of the Northeast Arctic cod stock, 1930–1990

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The data sets required for constructing age-based models for the Northeast Arctic cod stock are extended back to 1930 and critically reviewed. The full data set (1930–1994) is interpreted by both a standard virtual population analysis (VPA) and a version that allows for cannibalism. The resulting extended time-series of population abundance-at-age is used to reconsider the parent stock, temperature, and predation relationships described earlier. Results from the version of the VPA with cannibalism based on the new data confirm the earlier findings that temperature and spawning-stock biomass had a significant positive effect on recruitment. This is not the case with the extended time-series as interpreted by the standard VPA because, while significant temperature and juvenile predation effects are still found, a parent stock effect is no longer statistically significant. Moreover, the general level of explanation provided by the multiple regression is far less with the extended time-series.

Keywords: Northeast Arctic; cod; cannibalism; stock-recruitment; temperature; VPA

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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