Experimental calibration of the 18O/16O isotope fractionation between the biogenic aragonite of Viviparus contectus (Gastropoda) and its host freshwater was undertaken to generate a species specific thermometry equation. The temperature dependence of the fractionation factor, and the relationship between temperature, δ18Ocarb. and δ18Owater were calculated from specimens maintained under laboratory and field (collection and cage) conditions. Regression analysis indicated that the laboratory and field experiments produced clear but different linear trends and we have shown that the field cage thermometry equation is the most suitable for application to the fossil record. Comparisons made with existing aragonitic thermometry equations shows that the Viviparus contectus field collection and field cage equations are similar to those of both marine and freshwater aragonitic gastropods. \ud \ud Caged specimens were grown (Somerset, UK) between February and August 2008, with water samples and temperature measurements taken monthly. The temperature dependence of the fractionation factor (α), between 9.7 and 18°C, is given by (Eq. 1):\ud \ud 1000ln α = 13.28 (±1.06)*(1000T-1) −15.24 (±3.69) (T in Kelvin) (1)\ud and the relationship between temperature (T), δ18Ocarb. and δ18Owater is given by (Eq. 2):\ud \ud T = 19.23 (±0.36) −4.51 (±0.37)*(δ18Ocarb.−δ18Owater) (2)\ud (T is in °C, δ18Ocarb is with respect to Vienna Pee Dee Belemnite (VPDB) and δ18Owater is with respect to Vienna Standard Mean Ocean Water (VSMOW)).\ud \ud Seasonal δ18O profiles from specimens retrieved from the field cage experiment indicate that during shell secretion the δ18O composition of the shell carbonate is not influenced by size, sex or whether females contained eggs or juveniles. \u
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