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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Environmental changes reflected by sedimentary geochemistry for the last one hundred years of a tropical estuary

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Author(s):
Friedmann Angeli, Jose Lourenco [1] ; Rubio, Belen [2] ; Mi Kim, Bianca Sung [1] ; de Lima Ferreira, Paulo Alves [1] ; Siegle, Eduardo [1] ; Lopes Figueira, Rubens Cesar [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Oceanog Inst, BR-05508120 Sao Paulo - Brazil
[2] Univ Vigo, Marine Geosci Dept, Vigo 36310, Pontevedra - Spain
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF MARINE SYSTEMS; v. 189, p. 36-49, JAN 2019.
Web of Science Citations: 0
Abstract

Based on multiple proxies, such as major and trace elements, mineralogy, C-org/N-total ratio and delta C-13, we assessed the natural and anthropogenic depositional record in a tropical estuary (Caravelas, Brazil). The Caravelas estuary was once a pristine area of highly important ecological role, due to its mangroves and proximity to the largest reef system in the South Atlantic (Abrolhos Archipelago). However, during the past decades, the estuary has been subjected to both natural and anthropogenic impacts, such as a natural opening of an inlet and changes in land use. This study is based on three dated cores, taken from the inlet to the main channel. A shift in the organic and inorganic proxies, in the early 1960s, shows the impact of this natural opening on the hydrodynamics and sediment distribution. Furthermore, there is a clear spatial pattern in the contribution of the main sources to the organic matter content in the cores: the core collected further away from the inlet shows a strong C3 plant contribution while the ones recovered closer show a higher marine influence. Only a slight increase in enrichment factors of the selected trace metals has been observed and they have been attributed to land use changes rather than direct inputs from industrial and urban sources. Such information is vital for the effective management of coastal systems, mainly when considering natural and ongoing anthropogenic changes in its forcing conditions that are exacerbated by climate change. (AU)

FAPESP's process: 13/00102-8 - Assessment of availability and anthropogenic enrichment of metals, arsenic and hydrocarbons in marine sediments from Estuário de Caravelas (Southern Bahia)
Grantee:Rubens Cesar Lopes Figueira
Support Opportunities: Regular Research Grants