The glacial to interglacial δ13C records of the benthic foraminiferaCibicidoides wuellerstorfiand theUvigerina peregrinagroup from deep‐sea cores cannot be adjusted by a generally valid constant. The δ13C values of theU. peregrinagroup largely correlate with the accumulation rates of organic carbon, suggesting a local "habitat effect"; those ofC. wuellerstorfivary independently with respect to the carbon flux and record fluctuations in the δ13C of the ambient bottom water isotopic composi
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