Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France)
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 (delta C-13 and delta N-15) measurements in primary producers and wild oysters. The contribution of different potential food sources to the die...
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ftird:oai:ird.fr:fdi:010059919 2024-09-15T18:03:09+00:00 Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France) Marchais, V. Schaal, G. Grall, J. /Lorrain, Anne Nerot, C. Richard, P. Chauvaud, L. FRANCE 2013 https://www.documentation.ird.fr/hor/fdi:010059919 EN eng https://www.documentation.ird.fr/hor/fdi:010059919 oai:ird.fr:fdi:010059919 Marchais V., Schaal G., Grall J., Lorrain Anne, Nerot C., Richard P., Chauvaud L. Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France). 2013, 36 (4), p. 808-819 Biofilm Carbon Nitrogen Food web Estuary Bay of Brest text 2013 ftird 2024-08-15T05:57:42Z 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 (delta C-13 and delta N-15) 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 N-15 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. Text Crassostrea gigas IRD (Institute de recherche pour le développement): Horizon |
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Open Polar |
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IRD (Institute de recherche pour le développement): Horizon |
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language |
English |
topic |
Biofilm Carbon Nitrogen Food web Estuary Bay of Brest |
spellingShingle |
Biofilm Carbon Nitrogen Food web Estuary Bay of Brest Marchais, V. Schaal, G. Grall, J. /Lorrain, Anne Nerot, C. Richard, P. Chauvaud, L. Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France) |
topic_facet |
Biofilm Carbon Nitrogen Food web Estuary Bay of Brest |
description |
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 (delta C-13 and delta N-15) 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 N-15 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. |
format |
Text |
author |
Marchais, V. Schaal, G. Grall, J. /Lorrain, Anne Nerot, C. Richard, P. Chauvaud, L. |
author_facet |
Marchais, V. Schaal, G. Grall, J. /Lorrain, Anne Nerot, C. Richard, P. Chauvaud, L. |
author_sort |
Marchais, V. |
title |
Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France) |
title_short |
Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France) |
title_full |
Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France) |
title_fullStr |
Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France) |
title_full_unstemmed |
Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France) |
title_sort |
spatial variability of stable isotope ratios in oysters (crassostrea gigas) and primary producers along an estuarine gradient (bay of brest, france) |
publishDate |
2013 |
url |
https://www.documentation.ird.fr/hor/fdi:010059919 |
op_coverage |
FRANCE |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010059919 oai:ird.fr:fdi:010059919 Marchais V., Schaal G., Grall J., Lorrain Anne, Nerot C., Richard P., Chauvaud L. Spatial variability of stable isotope ratios in oysters (Crassostrea gigas) and primary producers along an estuarine gradient (Bay of Brest, France). 2013, 36 (4), p. 808-819 |
_version_ |
1810440677732909056 |