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- W2040662071 abstract "We examined δ13C values of shallow and deep-water scallop shells as well as δ13C of dissolved inorganic carbon (DIC) from the Bay of Brest in western Brittany. Time series of shell calcite δ13C do not reflect seasonal variation in seawater δ13C, but rather show a consistent pattern of decreasing δ13C with age, suggesting a metabolic effect rather than direct environmental control. This δ13C trend reflects an increasing contribution of metabolic CO2 to skeletal carbonate throughout ontogeny, although this respired CO2 does not seem to be the major source of skeletal carbon (contribution of only 10% over the first year of life). We propose a model of this effect that depends on the availability of metabolic carbon relative to the carbon requirements for calcification. A ratio of “respired to precipitated carbon” is calculated, and represents the amount of metabolic carbon available for calcification. Interestingly, this ratio increases throughout ontogeny suggesting a real increase of metabolic carbon utilization into the skeleton relative to carbon from seawater DIC. This ratio allows us to separate two different populations of Pecten maximus of different water depth. It is therefore suggested that shell δ13C might be used to track differences in the metabolic activity of scallops from different populations." @default.
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- W2040662071 date "2004-09-01" @default.
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- W2040662071 title "δ13C variation in scallop shells: Increasing metabolic carbon contribution with body size?" @default.
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- W2040662071 doi "https://doi.org/10.1016/j.gca.2004.01.025" @default.
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