Distribution of planctonic foraminifera (0 m - 100 m in the water column) and theirsedimentary record on the Southeastern Brazilian continental margin, between São Sebastião Island, SP, and São Tomé Cabe, RJ / "Distribuição de foraminíferos planctônicos (0 - 100m na coluna dágua) e seu registro no sedimento na margem continental sudeste brasileira, entre São Sebastião, SP, e Cabo de São Tomé, RJ"

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The present work focuses on the study of planktonic foraminifera on the southeast Brazilian continental margin between São Sebastião, SP and São Tomé, RJ. This was done by means of a survey of the existing species in the plankton. The seasonal and vertical distribution in the water column (0-100 m depth) of the planktonic foraminifera species was also determined. In addition, a comparison of the biocenose and of the tatocenose was carried out as well as a tafonomic analysis of the tests deposited in the bottom. This was done in order to evaluate the sedimentary record of these organisms and consider the possibility of using tafonomic signatures in planktonic foraminifera tests in order to better understand the hydrodynamic processes in the study area. For this, plankton samples collected in the summer and winter of 2002, as well as sediment samples, were analyzed. Methodologies common to planktonic foraminfera analysis were applied. The results show that there is a great seasonal difference in abundance and size of the planktonic foraminifera on the southeast Brazilian continental margin. The vertical distribution of these animals in the summer seems to be related to the depth of the mixture layer, variations in water temperature, and to the food chain. In the depth interval between 0 m and 40 m, there was a predominance of Globigerinoides ruber (pink) and Globigerinoides ruber (white). The species Globigerina bulloides, Neogloboquadrina dutertrei and Globigerinella siphonifera are predominate between 40 and 60 m. On the other hand, between 60 and 80 m Globorotalia menardii, Orbulina universa and Globigerina falconenis occur in greater quantities. The sedimentary record of the species of planktonic foraminifera found in the study area reflect the biocenose, being therefore appropriate for the usage in environmental and paleoceanographic analyses. The tafonomic signatures observed reflect the local hydrodynamic conditions.

ASSUNTO(S)

ecology protocolo tafonômico foraminíferos planctônicos taphonomy clorophill-a tafonomia margem continental sudeste brasileira planktonic foraminifera clorofila-a brazilian continental margin

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