Improvement of accuracy of water temperature reconstructions using oxygen stable isotope ratio of biogenic carbonates: Establishment of a correction method for vital effects

Abstract

In this study, we quantitatively evaluated vital effects on oxygen stable isotope ratio in two species of bivalve shells and one species of fish otolith. oxygen stable isotope ratio was different in each species even after excluding the contribution of temperature dependent fractionation, suggesting a species-specific vital effects on oxygen isotope fractionation. Significant correlation between oxygen stable isotope ratio and metabolic rate M(%) was observed in bivalves, suggesting that the oxygen isotope fractionation is affected by metabolism.