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Spatial Variability of Stable Isotope Ratios in Oysters (Crassostrea gigas) and Primary Producers Along an Estuarine Gradient (Bay of Brest, France)

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Abstract

This study aimed at characterizing the diet of the oyster Crassostrea gigas along an estuarine gradient in the Bay of Brest (France), through stable isotope (δ13C and δ15N) measurements in primary producers and wild oysters. The contribution of different potential food sources to the diet of C. gigas was estimated at high spatial resolution (over a gradient of 40 km with samplings every 2 km) to identify ecological transition zones and highlighted the dominance of resuspended biofilm in oysters diet. Although the different primary producers did not display any obvious pattern along the estuarine gradient, the stable isotope signatures of C. gigas differed among estuarine, inner Bay, and open sea sites. In particular, a striking 15N depletion pattern was found along the gradient which allowed to identify seven homogeneous groups. Moreover, some unexpected values found at two stations within the estuary revealed localized anthropogenic disturbances. Overall, our results suggest that suspension feeders might be better indicators of ecosystem functioning than primary producers and reflect the different ecological processes occurring along estuarine gradients, including localized anthropogenic inputs. We suggest that the usefulness of suspension feeders as indicators of ecosystem functional typology lies in the dominance of benthic material in their diet, which results in locally occurring processes being reflected in oysters’ stable isotope ratios.

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Acknowledgments

The project was supported by the INSU EC2CO program ISOBENT and by the GIS-Europole Mer. We thank J-M. Munaron, E. Morize, E. Dabas, C. Oudard, and A. Aguirre Velarde for their help in oyster sampling and preparation. We also thank E. Moreau-Haug of IDHESA Bretagne Oceane for providing a model of bacteria concentrations. We would like to thank the two anonymous reviewers for their helpful comments.

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Authors and Affiliations

  1. UMR 6539, LEMAR, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280, Plouzané, France

    Violette Marchais, Gauthier Schaal, Anne Lorrain, Caroline Nerot & Laurent Chauvaud

  2. UMS 3113, UBO, Observatoire du domaine côtier, Place Nicolas Copernic, 29280, Plouzané, France

    Jacques Grall

  3. UMR 6250, LIENSs, Université de la Rochelle, Bât. Marie Curie, rue Paul-Emile Victor, 17000, La Rochelle, France

    Pierre Richard

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  1. Violette Marchais
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  2. Gauthier Schaal
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Correspondence to Violette Marchais.

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Marchais, V., Schaal, G., Grall, J. et al. Spatial Variability of Stable Isotope Ratios in Oysters (Crassostrea gigas) and Primary Producers Along an Estuarine Gradient (Bay of Brest, France). Estuaries and Coasts 36, 808–819 (2013). https://doi.org/10.1007/s12237-012-9584-x

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