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Article Dans Une Revue Marine Ecology Progress Series Année : 2014

Artificial reefs do increase secondary biomass production: mechanisms evidenced by stable isotopes

Pierre Cresson
  • Fonction : Auteur
S. Ruitton

Résumé

A large complex of artificial reefs was deployed in the Bay of Marseilles, North-Western Mediterranean, for the enhancement of commercial fisheries stocks. Carbon and nitrogen stable isotope and stomach content analyses were performed on 23 fish species collected on the artificial reefs to assess their trophic position and feeding behaviour. Results indicated that fish diets were not modified on the artificial reefs compared to natural environments, nor was the structure of their trophic network. Artificial reefs, with their complex design, provide diverse and abundant food sources for fishes. Ranges of δ13C and δ15N of artificial reef fishes were comparable to those recorded in natural Mediterranean environments, with a similar trophic organization. However, some discrepancies appeared when comparing fish trophic level based on isotopic or diet results, which calls for a careful interpretation of stable isotope values as direct indicators of trophic level.
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hal-01433604 , version 1 (10-05-2021)

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Pierre Cresson, S. Ruitton, Mireille Harmelin-Vivien. Artificial reefs do increase secondary biomass production: mechanisms evidenced by stable isotopes. Marine Ecology Progress Series, 2014, 509, pp.15-+. ⟨10.3354/meps10866⟩. ⟨hal-01433604⟩
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