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Foraminifers have the potential to be used as natural archives, allowing the access to environmental conditions of marine systems of periods prior to the beginning of the instrumental records. In order to stablish these organisms as natural archives, it is necessary to check the fidelity of different groups of foraminifera in recording environmental conditions by geochemical information. In this study, we investigated the C and O isotopic composition of nine foraminifera genera from carbonate sediment samples collected in different parts of the Atol das Rocas, Tropical South Atlantic Ocean. The observed isotopic range for all foraminifera groups varied from -2.47 to 4.88‰ for δC and from -4.01 to -0.71‰ for δO. The δC values clearly distinguish the foraminifers from the Miliolida and Rotaliida Order. This difference might be related to the dependence of rotallids to their photosynthetic symbionts, promoting the uptake of C from photosynthetic activity for the construction of their shells, while the miliolids uptake the C directly from seawater, with less photosynthetic influence of their symbionts. Sea surface temperature (SST) calculations, based on δO values, ranged from 22.4 to 39.3 °C, in which the genera that best represent the SST range of the Rocas atoll were Sorites, Spiroculina, Triloculina, Gypsina and Amphistegina.

Isótopos Estáveis de Carbono e Oxigênio de Foraminíferos do Complexo Recifal do Atol das Rocas, Atlântico Sul