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Effets directs et indirects de la pêche sur des groupes trophiques de poissons démersaux, définis par une approche écomorphologique ArchiMer
Reecht, Yves.
Functional groups dynamics in marine communities help understanding how perturbations impact the functioning of an ecosystem. It is notably expected that functional groups respond differently to fishing pressure owing to their direct exposure to fishing and interactions between groups (indirect effects). A method was developed, based on an ecomorphological approach focusing on predation functions, to define size- and taxonomy-driven functional groups in demersal fish communities from the Celtic Sea and the North Sea. Eleven functional traits were used to define 12 functional groups in Celtic Sea (based on measurements on 930 individuals from 33 species) and seven groups in North Sea (710 individuals from 22 species). In the Celtic Sea, the functional...
Tipo: Text Palavras-chave: Fonctions trophiques; Prédation; Écomorphologie; Groupes fonctionnels; Effets de la pêche; Approche écosystémique; Poissons; Communautés démersales; Trophic functions; Predation; Ecomorphology; Functional groups; Fishing effects; Ecosystem approach; Fish; Demersal communities.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00006/11687/8359.pdf
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May life history traits be used as indices of population viability? ArchiMer
Rochet, Marie-joelle.
Concern has been raised that the widely used spawning stock biomass might not be a sensitive index of the reproductive potential of fish populations. On the other hand, there is increasing evidence that fishing affects life history traits of fish. Fish compensate for fishing mortality by faster growth, earlier maturity and increased fecundity. Because life history traits are affected by fishing and are also critical in determining the population growth rate, they may be used as indices of population viability. In this paper, the traits that meet both criteria are investigated among age-at-maturity, fecundity and growth. In the framework of matrix population models, the life table response experiments (LTRE) method is used to quantify the effects of fishing...
Tipo: Text Palavras-chave: Fishing effects; Population growth rate; Sensitivity analysis; Population viability indices.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-482.pdf
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