Climatic Constraints on Growth Rate and Geochemistry (Sr/Ca and U/Ca) of the Coral Siderastrea stellata in the Southwest Equatorial Atlantic (Rocas Atoll, Brazil)

Type Article
Date 2018-03
Language English
Author(s) Evangelista H.1, 2, Sifeddine A.2, 3, Correge T.4, Servain J.3, 5, Dassie E. P.3, Logato R.1, 2, Cordeiro R. C.2, Shen C. -C.6, Le Cornec F.3, Nogueira J.1, 2, Segal B.7, Castagna A.1, Turcq B.2, 3
Affiliation(s) 1 : LARAMG, DBB, IBRAG, Uerj, Pavilhao Harold L Cunha, Rio De Janeiro, Brazil.
2 : Univ Fed Fluminense, Inst Quim, Dept Geoquim, Programa Posgrad Geoquim, Outeiro Sao Joao Batisa S-N, Centro, Brazil.
3 : Sorbonne Univ, IRD, UPMC, LOCEAN,CNRS,MNHN,UMR, Paris, France.
4 : Univ Bordeaux, CNRS, EPOC, UMR 5805, Allee Geoffroy St Hilaire, Pessac, France.
5 : Fdn Cearense Meteorol & Recursos Hidricos, Fortaleza, Ceara, Brazil.
6 : Natl Taiwan Univ, Dept Geosci, High Precis Mass Spectrometry & Environm Change L, Taipei, Taiwan.
7 : Univ Fed Santa Catarina, CCB, Dept Ecol & Zool, Florianopolis, SC, Brazil.
Source Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2018-03 , Vol. 19 , N. 3 , P. 772-786
DOI 10.1002/2017GC007365
WOS© Times Cited 2
Keyword(s) coral, Siderastrea stellata, Rocas Atoll, ITCZ, Equatorial Atlantic, wind stress
Abstract

Although relatively rare compared to similar latitudes in the Pacific or Indian Oceans, massive coral colonies are present in the Tropical/Equatorial Southwestern Atlantic Ocean. However, detailed geo-chemical compositions of these corals are still largely unknown. In this work, we present growth rates, Sr/Ca, and U/Ca ratios of the coral colony (Siderastrea stellata) sampled at Rocas Atoll, off the Brazilian coast. These variables are primarily affected by sea surface temperature (SST) at seasonal scale, and by wind stress at interannual scale, these results represent a broad new finding. A lower significance at the interannual time scale between Sr/Ca and U/Ca with respect to SST is attributed to the low SST amplitude closed to Equator. An investigation on the dependence of coral growth rates with respect to the "cloud shading effect'' promoted by the Intertropical Convergence Zone (ITCZ) does not show significant influence. Additionally, rain seems to act on local geochemistry of Sr/Ca ratios and growth rate at the decadal scale.

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Evangelista H., Sifeddine A., Correge T., Servain J., Dassie E. P., Logato R., Cordeiro R. C., Shen C. -C., Le Cornec F., Nogueira J., Segal B., Castagna A., Turcq B. (2018). Climatic Constraints on Growth Rate and Geochemistry (Sr/Ca and U/Ca) of the Coral Siderastrea stellata in the Southwest Equatorial Atlantic (Rocas Atoll, Brazil). Geochemistry Geophysics Geosystems, 19(3), 772-786. Publisher's official version : https://doi.org/10.1002/2017GC007365 , Open Access version : https://archimer.ifremer.fr/doc/00623/73552/