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A multivariate stock–recruitment function for cohorts with sympatric subclasses: application to maternal effects in rockfish (genus Sebastes)

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Abstract:

I present a multivariate stock–recruitment function (MSRF) for calculating recruitment when a cohort comprises sympatric subclasses. Sympatric subclasses emerge when there are closely interacting subgroups occupying a very similar niche, but whose ecology dictates distinct mortality rates. Examples include multispecies complexes of juvenile rockfish (Sebastes spp.) in the California current and juvenile salmon (Oncorhynchus spp.) in streams following different life history strategies. I derive an MSRF and apply it to the ecology of larval and juvenile rockfish with maternal effects. In several species of rockfish, older mothers produce superior larvae. This is called a maternal effect. For these species, larval and juvenile cohorts comprise several sympatric subclasses, each with a distinct mortality rate related to the age of their mothers. I apply this model to data for black rockfish (Sebastes melanops) in California and Oregon and find the recruitment estimates based on data from a declining population may overestimate productivity of a recovering population if maternal effects are neglected. The MSRF proves to be a flexible framework for studying recruitment in the presence of sympatric subclasses.

Ce travail présente une fonction multidimensionnelle de stock–recrutement (MSRF) pour calculer le recrutement lorsqu’une cohorte contient des sous-classes sympatriques. Il se produit des sous-classes sympatriques, lorsqu’il y a des sous-groupes en interaction qui occupent des niches très semblables, mais dont l’écologie impose des taux de mortalité différents. Les complexes multispécifiques de jeunes sébastes (Sebastes spp.) dans le courant de Californie et les jeunes saumons (Oncorhynchus spp.) qui suivent des stratégies différentes de cycle biologique en eau courante constituent de bons exemples. Une MSRF est donc dérivée et appliquée à l’écologie de larves et de jeunes de sébastes possédant des effets maternels. Chez plusieurs espèces de sébastes, les mères plus âgées produisent des larves de meilleure qualité. C’est là un effet maternel. Chez ces espèces, les cohortes de larves et de jeunes comprennent plusieurs sous-classes sympatriques, chacune avec un taux de mortalité distinct relié à l’âge de leurs mères. Le modèle appliqué à des données sur le sébaste noir (Sebastes melanops) de Californie et d’Oregon montre que les estimations du recrutement basées sur des données provenant d’une population en déclin peuvent surestimer la productivité d’une population en rétablissement si on ne tient pas compte des effets maternels. La MSRF s’avère être un cadre flexible pour l’étude du recrutement lorsqu’il y a des sous-classes sympatriques.

Document Type: Research Article

Publication date: April 1, 2009

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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