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Abstract
Abstract Laboratory and ‘natural environment’ cultures demonstrate that isotopic compositions of ostracod shells record environmental conditions at the time of their precipitation. Oxygen isotope composition of ostracod calcite reflects the composition and temperature of the host water, but ostracod shells are enriched in 18 O compared to the value expected for inorganic calcite precipitating under equilibrium in the same conditions. This ‘vital effect’ is generally constant for closely related species. The carbon isotope composition of ostracod calcite is controlled by complex interaction between species ecology and environmental parameters. Many taxa crystallise their shells in or very close to equilibrium with the carbon isotope composition of Dissolved Inorganic Carbon (DIC), and the composition of littoral, epifaunal species reflects seasonal variation in the carbon isotope composition of bottom water DIC according to their life cycles, while that of deep-water, infaunal species reflects variation in interstitial pore water according to microhabitat preferences.
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