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| Pereira,Natan S.; Sial,Alcídes N.; Kikuchi,Ruy K.P.; Ferreira,Valderez P.; Ullmann,Clemens V.; Frei,Robert; Cunha,Adriana M.C.. |
| ABSTRACT Coral skeletons contain records of past environmental conditions due to their long life span and well calibrated geochemical signatures. C and O isotope records of corals are especially interesting, because they can highlight multidecadal variability of local climate conditions beyond the instrumental record, with high fidelity and sub-annual resolution. Although, in order to get an optimal geochemical signal in coral skeleton, sampling strategies must be followed. Here we report one of the first coral-based isotopic record from the Equatorial South Atlantic from two colonies of Porites astreoides from the Rocas Atoll (offshore Brazil), a new location for climate reconstruction. We present time series of isotopic variation from profiles along the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coral; Climate change; Rocas Atoll; Carbon and oxygen isotopes; South Atlantic Ocean. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501939 |
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| Bittencourt,Abílio C.S.P.; Leão,Zelinda M.A.N.; Kikuchi,Ruy K.P.; Dominguez,José M.L.. |
| This paper shows that the location of the shoreface bank reefs along the northeastern and eastern coasts of Brazil, in a first order approximation, seem to be controlled by the deficit of sediment in the coastal system. The sediment transport pattern defined by a numerical modeling of wave refraction diagrams, representing circa 2000 km of the northeastern and eastern coasts of Brazil, permitted the regional-scale reproduction of several drift cells of net longshore sediment transport. Those drift cells can reasonably explain the coastal sections that present sediment surplus or sediment deficit, which correspond, respectively, to regions where there is deposition and erosion or little/no deposition of sand. The sediment deficit allows the exposure and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sediment deficit; Longshore drift; Coral reefs; Northeast Brazil. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100015 |
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| Menezes,Natalia; Neves,Elizabeth; Kikuchi,Ruy K.P.; Johnsson,Rodrigo. |
| Siderastrea is a small genus of scleractinian corals, composed by zooxanthellate massive colonial forms. Besides contributing to the consolidation of the reef structure, represent a group with significant resistance to environmental stress. Until the 70's, its taxonomy was a complicated task, limited by the difficulty in identifying morphotypes. More recently, interspecific boundaries were redefined for 'Atlantic Siderastrea Complex'. However, despite new perspectives, including the occurrence of S. radians and S. siderea for Brazil, morphological patterns are still poorly studied and inconspicuous for several coastal areas. In order to characterize levels of intraspecific and interspecific morphological variation in S. stellata and S. radians,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Systematics; Modular organism; Morphotypes; Zooxanthellate coral; South Atlantic. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492014001600001 |
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