Data/hora: 07/06/2024 05:11:54

Provedor de dados: | 5
País: | France
Título: | Changements adaptatifs induits par la pêche chez les populations halieutiques
Autores: | Marty, Lise.
Data: | 2011-09-13
Ano: | 2011
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.
Resumo: | 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 to be slowly and/or hardly reversible, whereas plastic ones are in principle reversible in one generation. Furthermore, because it decreases total population size, fishing may also accelerate the rate of genetic drift that affects the neutral and functional genetic composition of harvested populations. This thesis is about adaptive changes in life-history traits induced by fishing, with a special focus on age and size at maturation and a case study on North Sea gadoids. It comprises four parts.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/00079/19013/16591.pdf
Editor: | AGROCAMPUS OUEST, Vie-Agro-Santé
Relação: | http://archimer.ifremer.fr/doc/00079/19013/
Formato: | application/pdf
Fonte: | 2011 the author