δ13C variation in scallop shells: Increasing metabolic carbon contribution with body size?
δ13C variation in scallop shells: Increasing metabolic carbon contribution with body size?
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扇贝壳中的 δ13C 变化：随着体型的增大，代谢碳贡献增加？
DOI：
10.1016/j.gca.2004.01.025
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发表时间：
2004
影响因子：
5
通讯作者：
M. Fontugne
中科院分区：
文献类型：
--
作者：
A. Lorrain;Y. Paulet;L. Chauvaud;R. Dunbar;D. Mucciarone;M. Fontugne
我们研究了布列塔尼西部布雷斯特湾浅水和深水扇贝贝壳的δ 13 C值以及溶解无机碳（DIC）的δ 13 C值。贝壳方解石δ 13 C的时间序列并不能反映海水δ 13 C的季节变化，而是显示出随年龄增长δ 13 C降低的一致模式，这表明代谢效应而不是直接的环境控制。这种δ 13 C趋势反映了在整个个体发育过程中，代谢CO2对骨骼碳酸盐的贡献越来越大，尽管这种呼吸CO2似乎不是骨骼碳的主要来源（在生命的第一年中贡献仅为10%）。我们提出了一个模型，这种影响取决于代谢碳相对于钙化的碳需求的可用性。计算“呼吸碳与沉淀碳”的比率，并表示可用于钙化的代谢碳的量。有趣的是，该比率在整个个体发育中增加，表明相对于来自海水DIC的碳，骨骼中代谢碳利用的真实的增加。这个比例使我们能够区分不同水深的两个不同的种群。因此，贝壳δ 13 C可能用于追踪不同群体扇贝代谢活动的差异。
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 CO2to skeletal carbonate throughout ontogeny, although this respired CO2does 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.