SciELO - Scientific Electronic Library Online

 
vol.14 número3Avaliação dos Impactos ambientais e socioeconômicos da aquicultura na região estuarina-lagunar de Cananéia, São Paulo, BrasilPerceção das populações locais face à sustentabilidade dos serviços das zonas costeiras: o caso da Lagoa de Santo André, Portugal índice de autoresíndice de assuntosPesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Revista de Gestão Costeira Integrada

versão On-line ISSN 1646-8872

Resumo

OLIVEIRA, Thaís de Santana; BARCELLOS, Roberto Lima; SCHETTINI, Carlos Augusto França  e  CAMARGO, Plínio Barbosa de. Modern sedimentary processes and the distribution of organic matter in a tropical estuarine system, Recife, PE, Brazil. RGCI [online]. 2014, vol.14, n.3, pp.399-412. ISSN 1646-8872.  https://doi.org/10.5894/rgci470.

The present study evaluates the environmental conditions of the Capibaribe and Beberibe estuarine systems and Pina Basin, by mean of sedimentary organic matter characteristics associated with traditional sedimentary analysis. The employed parameters were the grain size, carbonate contents and the elemental and isotopic sedimentary organic matter analysis (C, N,δ¹³C, δ15N), correlating this proxies to local environmental conditions in 50 surface sediment samples. Correlation analysis,cluster and principal components were made based on the results. The analysis revealed a predominance of the silty sediments, poorly selected and with high organic contents (1.2 to 15.2%) because it is a highly eutrophic environment. The carbonate contents do not present a direct relationship only with a specific grain size fraction (sand), but also with an available marine source. The stable isotopic ratios ranged from -26.20 to -21.62 ‰PDB (δ¹³C) and -0.96 to 6.05 ‰Ar (δ15 N). The current data and the comparison with previous work indicate a low-energy depositional environment, submitted to the strong influence of terrigenous sources, anthropogenic, in particular with marine influence on sedimentation in specific portions of the system. The area acts as a natural trap of sediments and is characterized as a confined estuarine environment, subjected to a strong silting process, densely urbanized with perennial supply of fine silty siliciclastic and clayey sediments, with high organic contents. This combination of factors produces an environment of coastal sedimentation with high environmental vulnerability, indicated by the classification as hypertrophic. This is a direct result of the anthropic multiple uses of the estuarine system, mainly associated to domestic and industrial sewage in natura discharges to the area, among other sources of pollution.

Palavras-chave : Estuarine sedimentation; organic matter; pollution.

        · resumo em Português     · texto em Português     · Português ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons