Strong kinetic effects on Sr/Ca ratios in the calcitic bivalve /Lorrain, Anne Gillikin, D.P. Paulet, Y.M. Chauvaud, L. Le Mercier, A. Navez, J. André, L. Although Sr/Ca ratios in abiogenic calcite are strongly controlled by precipitation rates, such a kinetic effect has never been demonstrated in calcitic bivalve shells. Therefore, we report Sr/Ca ratios together with daily growth rates in the calcitic shells of 4 individuals of the bivalve Pecten maximus (age class I). Ratios of Sr/Ca were found to be variable among individuals that grew at the same location, illustrating that vital effects dominate over environmental controls. Although daily growth rate was correlated with shell Sr/Ca ratios, it explained only half of the Sr/Ca variations. However, daily shell surface area increment, an estimation of the total quantity of carbonate precipitated for a given time, explained 74% of the Sr/Ca variability in the shells of P. maximus. This proves, for the first time in a calcitic bivalve, that shell Sr/Ca partitioning is mainly controlled by kinetic effects. The Sr/Ca ratio should therefore be tested as a potential proxy of calcification rate in modern or fossil calcitic biocarbonates. 2005 text https://www.documentation.ird.fr/hor/PAR00007493 PAR00007493 Lorrain Anne, Gillikin D.P., Paulet Y.M., Chauvaud L., Le Mercier A., Navez J., André L.. Strong kinetic effects on Sr/Ca ratios in the calcitic bivalve. 2005, 33 (12), 965-968 EN