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We examine seasonal variations in the stable carbon and oxygen isotopic composition of individual shells of the pteropods Limacina inflata and Styliola subula, collected from Oceanic Flux Program sediment traps (at 500m depth) near Bermuda in the western Sargasso Sea. Calcification depths estimated from L. inflata δ 18 O vary between 200 and 650m in late winter and spring, and between...