Opal phytolith and isotopic studies of "Restinga" communities of Maricá, Brazil, as a modern reference for paleobiogeoclimatic reconstruction

Authors

  • Cátia Pereira dos Santos UFF; Dept. de Geologia da UFF; Programa de Pós-Graduação em Dinâmica dos Oceanos e da Terra
  • Heloisa Helena Gomes Coe UERJ; Faculdade de Formação de Professores; Departamento de Geografia
  • Natalia Borrelli UNMdP; Instituto de Geología de Costas y del Cuaternario
  • André Luiz Carvalho da Silva UERJ; Faculdade de Formação de Professores; Departamento de Geografia
  • Leandro de Oliveira Furtado de Sousa Universidade Federal Rural do Semi-Árido; Departamento de Ciências Vegetais
  • Yame Bronze Medina Ramos UFF; Dept. de Geologia da UFF; Programa de Pós-Graduação em Dinâmica dos Oceanos e da Terra
  • Carolina Pereira Silvestre UFF; Dept. de Geologia da UFF; Programa de Pós-Graduação em Dinâmica dos Oceanos e da Terra
  • Amanda Pacheco Seixas UFF; Dept. de Geologia da UFF; Programa de Pós-Graduação em Dinâmica dos Oceanos e da Terra

DOI:

https://doi.org/10.1590/S1679-87592015086606303

Abstract

The Maricá restinga, located in the eastern part of the Rio de Janeiro State (Brazil), corresponds to one of the few remaining preserved areas of the state's coastal plain. This paper reports on a study of the Maricá restinga plant communities and also presents an identification of the main plant species present in each community, with the objective of establishing reference collections, by the methods of the proxies opal phytoliths and stable carbon isotopes, for paleoenvironmental reconstructions of this coastal area during the Quaternary. Six plant communities, distributed perpendicularly to the coast line over sandy barriers, lagoonal plain, lagoon margin and weathered basement were identified: halophile-psamophile, scrub, herbaceous swamp, slack, shrubby vegetation and dry forest. In general, the plant species analyzed in each community presented low productivity of opal phytoliths, as only the Poaceae, Cyperaceae and Arecaceae families produce a great amount and diversity of morphotypes of opal phytoliths. The results of the analysis of stable carbon isotopes in sediments indicated a predominance of C3 or a mixture of C3 and C4 plants, presenting a close correlation with the results found in plants collected in each community. In conclusion, it was verified that the carbon isotope analysis associated with that of the opal phytoliths are good proxies for the reconstruction of vegetation in the study area.

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Published

2015-09-01

How to Cite

Santos, C. P. dos, Coe, H. H. G., Borrelli, N., Silva, A. L. C. da, Sousa, L. de O. F. de, Ramos, Y. B. M., Silvestre, C. P., & Seixas, A. P. (2015). Opal phytolith and isotopic studies of "Restinga" communities of Maricá, Brazil, as a modern reference for paleobiogeoclimatic reconstruction . Brazilian Journal of Oceanography, 63(3), 255-270. https://doi.org/10.1590/S1679-87592015086606303

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Original Article