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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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Use of morphological characteristics to define functional groups of predatory fishes in the Celtic Sea ArchiMer
Reecht, Yves; Rochet, Marie-joelle; Trenkel, Verena; Jennings, S.; Pinnegar, J. K..
An ecomorphological method was developed, with a focus on predation functions, to define functional groups in the Celtic Sea fish community. Eleven functional traits, measured for 930 individuals from 33 species, led to 11 functional groups. Membership of functional groups was linked to body size and taxonomy. For seven species, there were ontogenetic changes in group membership. When diet composition, expressed as the proportions of different prey types recorded in stomachs, was compared among functional groups, morphology-based predictions accounted for 28-56% of the interindividual variance in prey type. This was larger than the 12-24% of variance that could be explained solely on the basis of body size. (C) 2013 The Fisheries Society of the British Isles
Tipo: Text Palavras-chave: Ecomorphology; Functional traits; Predation strategy; Trophic functions.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00152/26294/24831.pdf
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