Limited evidence for species‐specific sensitivity of temperature‐dependent fractionation of oxygen stable isotope in biominerals: A meta‐analysis

Abstract

1. Water temperature is key to the study of aquatic ectotherm ecology, but precise measurements of individual-based thermal experience remain difficult to validate.

Incorporating otolith-isotope inferred field metabolic rate into conservation strategies

“…Stable isotopes of oxygen undergo equilibrium fractionation during incorporation into precipitating aragonite, with the fractionation effect predictably related to the temperature of precipitation (Kim and O'Neil). The thermal sensitivity of equilibrium fractionation of oxygen isotopes between water (endolymph) and aragonite appears to be conserved across fish taxa and is not measurably different from that of inorganic aragonite precipitation ( Morissette et al., 2023 ). However, the isotopic offset between ambient water and otolith aragonite; the intercept term in isotope thermometry equations, does appear to vary among taxa and environment (freshwater vs marine), potentially related to differences in physiology and/or water balance.…”

“…However, the isotopic offset between ambient water and otolith aragonite; the intercept term in isotope thermometry equations, does appear to vary among taxa and environment (freshwater vs marine), potentially related to differences in physiology and/or water balance. A meta-analysis of biomineral oxygen isotope fractionation relationships ( Morissette et al., 2023 ) suggests the following two otolith thermometry equations if species-specific intercept terms are unavailable:…”