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A model for the phenotypic plasticity of North sea herring growth in relation to trophic conditions ArchiMer
Shinn, Yunne-jai; Rochet, Marie-joelle.
An adaptation of the von Bertalanffy growth model is formulated to describe the phenotypic plasticity of fish somatic growth in relation to trophic conditions. The model is developed for the North sea Downs herring (Clupea harengus). II suggests that annual growth variability during 1974-1990 was mainly due to the combined effects of herring abundance and wind-induced turbulence (coincident with the spring stratification of the water column). Springtime turbulences cause reduced and delayed planktonic blooms preceding the annual foraging period of Downs herring. The negative relation observed between herring abundance and growth is hypothesized to be due to intra-specific competition for trophic resources. Incorporated into the calculation of yield per...
Tipo: Text Palavras-chave: Modèle de croissance; Densité-dépendance; Plasticité phénotypique; Clupea harengus; Hareng de mer du Nord; Gestion des pêches; Growth model; Density dependence; Phenotypic plasticity; Fishery management; Clupea harengus; North sea herring.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00188/29878/28358.pdf
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Changements adaptatifs induits par la pêche chez les populations halieutiques ArchiMer
Marty, Lise.
Fishing is an important source of mortality in harvested populations and therefore may induce adaptive responses. These responses affect life-history traits in particular, which have consequences for stocks’ dynamics, and thus can alter the demographic direct effect of fishing (i.e. the reduction in stock’s biomass). Fishing-induced adaptive changes depend, non-exclusively, on two processes: evolution and phenotypic plasticity. These two components are observed at the phenotypic level because functional genes coding for the traits undergoing adaptive changes have not yet been identified. These two origins are confounded in individual phenotypes, and the impact of adaptive changes in the long run remains therefore unclear: evolutionary changes are expected...
Tipo: Text Palavras-chave: : Pêche; Évolution adaptative; Plasticité phénotypique; Norme de réaction; Dérive génétique; Érosion génétique; Age et taille à maturation; Croissance; Survie; Trade-offs; Densité-dépendance; Gadidées de mer du nord; Fishing; Adaptive evolution; Phenotypic plasticity; Reaction norm; Genetic drift; Genetic erosion; Age and size at maturation; Growth; Survival; Trade-offs; Density-dependence; North sea Gadoids.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00079/19013/16591.pdf
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Sensibilité des populations de poissons aux changements globaux en fonction de leurs traits d'histoire de vie étudiée par une approche empririque ArchiMer
Persohn, Cecile.
L’objectif de ce travail de thèse était d’étudier les effets des variations environnementales observées au large des côtes françaises, sur les populations d’une sélection de poissons démersaux. Pour cela, nous nous sommes focalisés sur trois conséquences possibles des variations environnementales importantes en termes de gestion des stocks : l’abondance, la distribution et la taille des individus. Il s’agissait donc d’étudier l’effet de plusieurs facteurs environnementaux, comme la température et la salinité, sur ces trois paramètres. Néanmoins, comme l’abondance, la distribution et la taille des individus peuvent aussi être affectées par des facteurs biotiques, tels que la compétition intraspécifique ou la disponibilité en nourriture (Brett, 1979 ; Swain...
Tipo: Text Palavras-chave: Impacts environnementaux; Abondance; Distribution; Taille; Densité-dépendance; Otolithe; Relation allométrique.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00044/15573/12972.pdf
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