Artigo Acesso aberto Produção Nacional Revisado por pares

The Impacts of the Middle Holocene High Sea-Level Stand and Climatic Changes on Mangroves of the Jucuruçu River, Southern Bahia – Northeastern Brazil

2017; Cambridge University Press; Volume: 59; Issue: 1 Linguagem: Inglês

10.1017/rdc.2017.6

ISSN

1945-5755

Autores

Neuza A. Fontes, Caio Alves de Moraes, Marcelo Cancela Lisboa Cohen, Igor Charles Castor Alves, Marlon Carlos França, Luiz Carlos Ruiz Pessenda, Mariah Izar Francisquini, José Albertino Bendassolli, Kita Macário, Francis E. Mayle,

Tópico(s)

Coastal and Marine Dynamics

Resumo

Abstract The aim of this paper is to evaluate the compatibility between the Holocene relative sea-level (RSL) curves proposed for the Brazilian littoral and mangrove dynamics along a fluvial valley in the state of southern Bahia. This was done integrating geomorphological, sedimentological, palynological, and stable isotopic data from two cores collected at the mouth of the Jucuruçu River and at a site 23 km inland, near the city of Prado, northeastern Brazil. Core PR07, sampled from a fluvial plain at about 4.5±1 m above the RSL, reveals mangrove pollen (5–20%) and estuarine/terrestrial organic matter (δ 13 C=~–25‰, C/N=7.3–67) between 4.5 m (~7400 cal yr BP) and 1.75 m depth (~5350 cal yr BP). Core PR11, sampled from a mangrove tidal flat, also revealed mangrove pollen taxa (5-28%) since 660 cal yr BP. Core PR07 indicated absence of mangrove pollen and increase of sedimentary organic matter sourced from terrestrial C3 plants (δ 13 C=~–27‰, C/N=22–159) during the last 5350 cal yr BP. Probably, the changes in vegetation and sedimentary organic matter identified in core PR07 were caused by the combined effects of the RSL fluctuations, with a highstand at about 5350 cal yr BP of 2.7±1.35 m, and changes in fluvial discharge.

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