Determination of diet in Manila clams by spatial analysis of stable isotopes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Marine Ecology Progress Series Année : 2009

Determination of diet in Manila clams by spatial analysis of stable isotopes

Résumé

Spatial changes in the dietary regime of Ruditapes philippinarum from intertidal sediments of Arcachon Bay were depicted by analyzing stable isotope ratios in both its adductor muscles and potential trophic sources. Manila clams were collected from 50 sites in May to June 2006. Dietary reconstruction was based on the IsoSource mixing model, considering trophic enrichments of 3.5‰ for carbon and 3.0‰ for nitrogen, which were determined experimentally. δ13C and δ15N values, respectively, averaged –28.2 and 5.2‰ for riverine particulate organic matter (POM), –20.6 and 4.7‰ for inner bay phytoplankton, –21.0 and 5.6‰ for outer bay phytoplankton, –16.8 and 4.8‰ for microphytobenthos, –18.4 and 3.9‰ for sedimentary organic matter (SOM) and 11.8 and 4.0‰ for Zostera noltii. Clam muscle δ13C and δ15N values ranged from –20.5 to –16.4‰, and from 7.6 to 9.3‰, respectively. δ15N significantly decreased from southern to northern parts of the bay, while δ13C values increased with tidal elevation. Outer bay phytoplankton was the major diet component of clams. Clams from the southeast mainly incorporated outer bay phytoplankton despite the proximity of the Leyre River, whereas clams from the northwest incorporated approximately equal parts of inner and outer bay phytoplankton, riverine POM, microphytobenthos and SOM. These patterns were consistent with spatial gradients driven by the dominant role of tidal hydrodynamics within the bay and land-use characteristics of the catchment.
Fichier principal
Vignette du fichier
m387p167.pdf (499.04 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-01855416 , version 1 (07-05-2021)

Licence

Paternité

Identifiants

Citer

Cécile Dang, Pierre-Guy Sauriau, Nicolas Savoye, Nathalie Caill-Milly, Philippe Martinez, et al.. Determination of diet in Manila clams by spatial analysis of stable isotopes. Marine Ecology Progress Series, 2009, 387, pp.167 - 177. ⟨10.3354/meps08100⟩. ⟨hal-01855416⟩
82 Consultations
53 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More