Titre :

Dynamics of stable isotope ratios (d13c and d15n) in different organs of crassostrea gigas at two contrasted ecosystems : insights from growth and food sources

Auteur(s) :

Emmery, A. [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Vrije Universiteit Amsterdam [Amsterdam] [VU]
Université de Caen Normandie [UNICAEN]
Alunno Bruscia, M. [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Bataillé, Marie-Paule [Auteur]
Ecophysiologie Végétale, Agronomie et Nutritions [EVA]
Kooijman, S. A. L. M. [Auteur]
Vrije Universiteit Amsterdam [Amsterdam] [VU]
Lefebvre, Sebastien [Auteur correspondant]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]

Titre de la revue :

Vie et Milieu / Life & Environment

Pagination :

261-273

Éditeur :

Observatoire Océanologique - Laboratoire Arago

Date de publication :

2016

ISSN :

0240-8759

Mot(s)-clé(s) en anglais :

marennes-oleron bay
crepidula-fornicata
reproductive-cycle
coastal ecosystems
suspension-feeders
cerastoderma-edule
seasonal-variation
trophic ecology
carbon isotopes
mytilus-edulis

Discipline(s) HAL :

Sciences du Vivant [q-bio]

Résumé en anglais : [en]

We studied the influence of food availability on the growth (whole body and organs) of the oyster Crassostrea gigas and on the dynamics of their delta C-13 and delta N-15 respective values. Juvenile oysters originating ...
Lire la suite >We studied the influence of food availability on the growth (whole body and organs) of the oyster Crassostrea gigas and on the dynamics of their delta C-13 and delta N-15 respective values. Juvenile oysters originating from Arcachon Bay were transplanted to two contrasting ecosystems, Baie des Veys (BDV) and Rade de Brest (RDB), for a 1-yr growth survey. In BDV, chlorophyll-a concentrations ([Chl-a]) was 3 times higher than in RDB on average, which accounts for the differences in oyster growth between BDV and RDB. Differences in trophic conditions could also explain the differences in C/N ratios and delta C-13 values between sites partly due to higher investment in gametogenesis for the oysters in BDV than in RDB; these differences widened when lipid normalized delta C-13 values were used. Oysters clearly selected microalgae as the main food source, and especially phytoplankton. Gi (Gills), Mu (Muscle) and Re (remaining organs) clearly exhibited different isotopic enrichment levels, with delta(Mu) > delta(Gi) > delta(Re) regardless of C or N elements, culture sites and seasons. delta N-15 discrimination between organs was rather equivalent between sites. These results would benefit from an experiment under controlled conditions along a calibration of the lipid normalization to correct delta C-13 values in bivalves.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL