Experimental shift of diet and DIC stable carbon isotopes: influence on shell δ13C values in the Manila clam Ruditapes philippinarum

Céline Poulain; Anne Lorrain; Remy Mas; David Paul Gillikin; F. Dehairs; Rene Robert; Yves-Marie Paulet

doi:10.1016/j.chemgeo.2010.02.006

Experimental shift of diet and DIC stable carbon isotopes: influence on shell δ13C values in the Manila clam Ruditapes philippinarum

Céline Poulain ^{1, *} Anne Lorrain ^{1, 2} Remy Mas ³ David Paul Gillikin ^{4, 5} F. Dehairs ³ Rene Robert ⁶ Yves-Marie Paulet ¹

* Auteur correspondant

1 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)

2 THETIS - Thons tropicaux et écosystèmes pélagiques : taxies, interactions et stratégies d'exploitation

3 Department of Analytical Chemistry

4 VUB - Vrije Universiteit [Brussel]

5 Department of Earth Science and Geography [Poughkeepsie]

6 LPI - Laboratoire de Physiologie des Invertébrés

Abstract : The influences of diet and seawater dissolved inorganic carbon (DIC) on the carbon isotope composition of shell aragonite (δ13Cshell) in the Manila clam Ruditapes philippinarum reared under laboratory conditions were investigated. Clams were exposed to two successive negative carbon isotope shifts: a first shift in diet (δ13Cphytoplankton) and a second shift, 35 days later, in DIC (δ13CDIC). Both successive shifts induced a decrease in δ13Cshell. These results are the first to experimentally confirm an incorporation of respired carbon derived from food and carbon from DIC into shell carbonate of adult bivalves. Skeletal δ13C responded to changes in the δ13C of both diet and DIC in less than 7 days. Consequently, proxies based on δ13Cshell may be used with high temporal resolution. Using δ13Cphytoplankton as a proxy for the carbon isotope composition of respired carbon (δ13CR) resulted in a rather constant percentage of metabolic carbon (CM) into the shell carbonate over time (close to 12%). However, an accurate estimation of δ13CR is required in order to precisely estimate the percentage of metabolic carbon incorporated into the shell. Despite the significant incorporation of metabolic carbon into shell carbonate, our experimental results revealed that δ13Cshell was highly correlated with δ13CDIC (r² = 0.77, p < 0.0001). Thus it seems that δ13Cshell is a promising proxy of large scale variations in δ13CDIC and therefore of salinity in estuarine water.

Keywords : δ13Cshell DIC Salinity Metabolic carbon Ruditapes philippinarum Estuarine water Proxy

Type de document :

Article dans une revue

Chemical Geology, Elsevier, 2010, 272 (1-4), pp.75. 〈10.1016/j.chemgeo.2010.02.006〉

Domaine :

Planète et Univers [physics] / Océan, Atmosphère

Sciences de l'environnement / Milieux et Changements globaux

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Experimental shift of diet and DIC stable carbon isotopes: influence on shell δ13C values in the Manila clam Ruditapes philippinarum

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Experimental shift of diet and DIC stable carbon isotopes: influence on shell δ13C values in the Manila clam Ruditapes philippinarum

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