Shift in benthic assemblages and organisms' diet under salmon farms: community structure and stable isotope analyses. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Marine Ecology Progress Series Année : 2013

Shift in benthic assemblages and organisms' diet under salmon farms: community structure and stable isotope analyses.

Résumé

The extent of the influence of salmon farming on the environment and on the uptake of particulate and dissolved effluents by benthic organisms was assessed using community structure and stable isotope analyses. Sediment cores were collected in 2 directions: perpendicular and parallel to the main residual current, 0, 25 and 200 m from 2 salmon farms (Millstone and Cranford) located in Mulroy Bay, Ireland. In addition, artificial substrates were placed for 2 mo at 1 m depth 0, 25 and 200 m from one farm to trace the uptake of farm-related nutrients by fouling organisms. The extent of measurable change in benthic communities (abundance, diversity, structure, trophic composition) depended on residual current direction. Intraspecific variation in isotopic values in benthic invertebrates was mostly explained by distance from cages. Organisms collected at impacted sites exhibited a shift in isotopic composition towards that of farm wastes. A shift in δ13C was observed in several invertebrates, including the polychaetes Malacoceros fuliginosus and Nephtys hombergii, Nematoda and the anemone Anthopleura balii. Fouling communities collected on artificial structures, mainly composed of the tunicate Ascidiella aspersa, showed higher δ15N values at fish cage sites compared to sites 200 m away. The study demonstrated that fish effluents were assimilated and became food sources for several organisms
Fichier principal
Vignette du fichier
m483p153.pdf (398.38 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-00913479 , version 1 (10-05-2021)

Licence

Paternité

Identifiants

Citer

Myriam D Callier, Sébastien Lefebvre, Mary K Dunagan, Marie-Paule Bataillé, Jennifer Coughlan, et al.. Shift in benthic assemblages and organisms' diet under salmon farms: community structure and stable isotope analyses.. Marine Ecology Progress Series, 2013, 483, pp.153-167. ⟨10.3354/meps10251⟩. ⟨hal-00913479⟩
127 Consultations
42 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More