Title :

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

Author(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]

Journal title :

Vie et Milieu / Life & Environment

Pages :

261-273

Publisher :

Observatoire Océanologique - Laboratoire Arago

Publication date :

2016

ISSN :

0240-8759

English keyword(s) :

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

HAL domain(s) :

Sciences du Vivant [q-bio]

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

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

Source :

Harvested from HAL