2026-04-13T03:08:14Zhttps://recercat.cat/oai/requestoai:recercat.cat:2072/4110332024-11-24T23:33:33Zcom_2072_98col_2072_378192
RECERCAT
author
Cléroux, Caroline
author
Cortijo, Elsa
author
Duplessy, Jean-Claude
author
Zahn, Rainer
2007
We measured the oxygen isotopic composition of the deep-dwelling foraminiferal species G. inflata, G. truncatulinoides dextral and sinistral, and P. obliquiloculata in 29 modern core tops raised from the North Atlantic Ocean. We compared calculated isotopic temperatures with atlas temperatures and defined ecological models for each species. G. inflata and G. truncatulinoides live preferentially at the base of the seasonal thermocline. Under temperature stress, i.e., when the base of the seasonal thermocline is warmer than 16°C, G. inflata and G. truncatulinoides live deeper in the main thermocline. P. obliquiloculata inhabits the seasonal thermocline in warm regions. We tested our model using 10 cores along the Mauritanian upwelling and show that the comparison of δ¹⁸O variations registered by the surficial species G. ruber and G. bulloides and the deep-dwelling species G. inflata evidences significant glacial-interglacial shifts of the Mauritanian upwelling cells.
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Deep-dwelling foraminifera
Depth habitat
Isotopic temperature
Mauritanian upwelling
North Atlantic
Thermocline
Deep-dwelling forminifera as thermocline temperature recorders
Article