2026-04-17T03:31:20Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/4110332024-11-24T23:33:33Zcom_2072_98col_2072_378192

00925njm 22002777a 4500 dc Cléroux, Caroline author Cortijo, Elsa author Duplessy, Jean-Claude author Zahn, Rainer author 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. Deep-dwelling foraminifera Depth habitat Isotopic temperature Mauritanian upwelling North Atlantic Thermocline Deep-dwelling forminifera as thermocline temperature recorders