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

Type Article
Date 2009-07
Language English
Author(s) Dang C.1, 2, Sauriau Pierre-Guy3, Savoye N.1, 2, Caill-Milly NathalieORCID4, Martinez P.5, 6, Millaret C.1, 2, Haure JoelORCID7, de Montaudouin X.1, 2
Affiliation(s) 1 : Univ Bordeaux, F-33120 Arcachon, France.
2 : CNRS, UMR 5805, Stn Marine Arcachon, F-33120 Arcachon, France.
3 : Univ La Rochelle, LIENSs, CNRS, F-17000 La Rochelle, France.
4 : IFREMER, Lab Ressources Halieut Aquitaine, F-64600 Anglet, France.
5 : Univ Bordeaux, F-33405 Talence, France.
6 : CNRS, UMR 5805, F-33405 Talence, France.
7 : IFREMER, Lab Genet & Pathol, F-85230 Polder Des Champs, Bouin, France.
Source Marine Ecology Progress Series (0171-8630) (Inter-Research), 2009-07 , Vol. 387 , P. 167-177
DOI 10.3354/meps08100
WOS© Times Cited 32
Keyword(s) SW France, Arcachon Bay, Spatial variability, Mixing model, Trophic sources, C and N stable isotopes, Muscle, Ruditapes philippinarum
Abstract 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. delta C-13 and delta N-15 values, respectively, averaged -28.2 and 5.2 parts per thousand for riverine particulate organic matter (POM), -20.6 and 4.7 parts per thousand for inner bay phytoplankton, -21.0 and 5.6%. for outer bay phytoplankton, -16.8 and 4.8 parts per thousand. for microphytobenthos, -18.4 and 3.9 parts per thousand. for sedimentary organic matter (SOM) and 11.8 and 4.0 parts per thousand. for Zostera noltii. Clam muscle delta C-13 and delta N-15 values ranged from -20.5 to -16.4 parts per thousand., and from 7.6 to 9.3 parts per thousand., respectively. delta N-15 significantly decreased from southern to northern parts of the bay, while delta C-13 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.
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Dang C., Sauriau Pierre-Guy, Savoye N., Caill-Milly Nathalie, Martinez P., Millaret C., Haure Joel, de Montaudouin X. (2009). Determination of diet in Manila clams by spatial analysis of stable isotopes. Marine Ecology Progress Series, 387, 167-177. Publisher's official version : , Open Access version :