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Revisiting the influences of parent stock, temperature, and predation on the recruitment of the northeast Arctic cod stock, 1930-1990
Pope, J.; Large, P.A.; Jakobsen, T. (2001). Revisiting the influences of parent stock, temperature, and predation on the recruitment of the northeast Arctic cod stock, 1930-1990, in: Daan, N. et al. Recruitment dynamics of exploited marine populations: physical-biological interactions. Part 2: Proceedings of an ICES Symposium held in Baltimore, Maryland, USA 22-24 September 1997. ICES Marine Science Symposia, 214: pp. 967-972
In: Daan, N. et al. (2001). Recruitment dynamics of exploited marine populations: physical-biological interactions. Part 2: Proceedings of an ICES Symposium held in Baltimore, Maryland, USA 22-24 September 1997. ICES Marine Science Symposia, 214. Academic Press: London. ISBN 1054. 935-1114 pp., more
In: ICES Marine Science Symposia. ICES/Reitzel: Copenhagen. ISSN 0906-060X, more

Also published as
  • Pope, J.; Large, P.A.; Jakobsen, T. (2001). Revisiting the influences of parent stock, temperature, and predation on the recruitment of the northeast Arctic cod stock, 1930-1990. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 58(5): 967-972, more

Available in Authors 
Document type: Conference

Keywords
    Cannibalism; Cod; Stock assessment; Temperature; PNE, Arctic [Marine Regions]; Marine

Authors  Top 
  • Pope, J.
  • Large, P.A., correspondent
  • Jakobsen, T.

Abstract
    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.

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