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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.)

Reconstruction of the palaeo-ecological quality status in an impacted estuary using benthic foraminifera: The Santos Estuary (Sao Paulo state, SE Brazil)

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de Jesus, Marcio S. dos S. [1] ; Frontalini, Fabrizio [2] ; Bouchet, Vincent M. P. [3] ; Yamashita, Cintia [1] ; Sartoretto, Julie R. [1] ; Figueira, Rubens C. L. [1] ; de Mello E Sousa, Silvia H. [1]
Total Authors: 7
[1] Univ Sao Paulo, Inst Oceanog, Praca Oceanog 191, Sao Paulo, SP - Brazil
[2] Univ Urbino Carlo Bo, DiSPeA, Campus Sci Enrico Mattei, I-61029 Urbino - Italy
[3] Univ Lille, Univ Littoral Cote DOpale, Lab Oceanol & Geosci, CNRS, UMR 8187, LOG, F-59000 Lille - France
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 0

The Santos Estuary (SE Brazil) is a coastal ecosystem with a high ecological importance and has been strongly impacted by human activities over the last century. A multiproxy analysis of sediment core dated by 137Cs, 210Pb and 226Ra activities and based on sediment geochemistry and benthic foraminifera is here used to reconstruct the environmental changes and the variations of the Palaeo-Ecological Quality Status (Palaeo-EcoQS) during the last-120 years. The Palaeo-EcoQS was reconstructed by applying the diversity index Exp(H'bc) based on the benthic foraminiferal fauna. Specifically, the Ecological Quality Ratio (EQR) allowed to assess the Palaeo-EcoQS during the last-120 years using local reference conditions. Based on our data, the pre-industrial period (-1883-1902) represents the reference conditions with ``Good{''} Palaeo-EcoQS. The-1902-1972 period coincides with the beginning of industrial operations and intensification of coastal urbanization leading to a deterioration of the environmental quality and Palaeo-EcoQS shifting to ``Moderate{''} conditions. Dredging operations in 1972 led to increase the influences of adjacent sea that ultimately resulted in a ``Good{''} Palaeo-EcoQS persisting up to the 1990s. Despite the preservation actions and recovery programs, the 1993-2012 period was characterized by an overall deterioration of the environmental conditions. Indeed, the reconstructed ``Poor{''} to ``Bad{''} Palaeo-EcoQS suggest the ineffectiveness of the remediation actions. This work confirmed that benthic foraminifera are reliable to evaluate EcoQS and Palaeo-EcoQS in estuarine ecosystems. Based on the present findings and previous studies showing the potential of fossil foraminifera to define in situ reference conditions, we recommend the inclusion of foraminifera in the list of biological quality elements within legislations concerning transitional and marine habitats. (AU)

FAPESP's process: 18/14161-0 - Environmental quality status evaluation based on multiple proxies of the estuarine system of Santos, São Paulo, over the last century
Grantee:Márcio Santana dos Santos de Jesus
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 19/22902-2 - Environmental quality status evaluation based on multiple proxies in the Estuarine system of Santos (São Paulo - Brazil) over the last century
Grantee:Márcio Santana dos Santos de Jesus
Support Opportunities: Scholarships abroad - Research Internship - Scientific Initiation
FAPESP's process: 19/13833-7 - Evaluation of the environmental quality of the estuarine system of Santos, São Vicente and Bertioga, Southern Coast of the State of São Paulo: a multiproxy study (AQUASAN)
Grantee:Silvia Helena de Mello e Sousa
Support Opportunities: Regular Research Grants
FAPESP's process: 11/50581-4 - Susceptibility and resilience of urban estuarine systems to global changes: hydro-sedimentologic budget; sea-level rise; response to extreme events
Grantee:Rubens Cesar Lopes Figueira
Support Opportunities: Regular Research Grants