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Doctoral Thesis
DOI
10.11606/T.21.2007.tde-09042007-163722
Document
Author
Full name
Marcos Yukio Yoshinaga
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Sumida, Paulo Yukio Gomes (President)
Carreira, Renato da Silva
Mahiques, Michel Michaelovitch de
Rodrigues Neto, Renato
Vanin, Ana Maria Setubal Pires
Title in Portuguese
"Origem e composição da matéria orgânica e a dinâmica da comunidade microbiana em sedimentos superficiais de ecossistemas marinhos da costa sudeste do Brasil"
Keywords in Portuguese
biomarcadores lipídicos
Ciclo do carbono no ambiente marinho
comunidade microbiana bêntica
costa sudeste do Brasil.
fontes da matéria orgânica sedimentar
Abstract in Portuguese
A ciclagem de matéria orgânica (MO) no ambiente marinho é um processo-chave para o ciclo global de carbono. Os sedimentos costeiros são de suma importância para a ciclagem de carbono pois atuam como receptores de grandes quantidades de MO alóctone (i.e. terrestre) e autóctone (i.e. marinho). A miríade dos componentes orgânicos e suas diferentes características dificultam o entendimento das fontes de MO em ambientes costeiros. Este trabalho visou entender a origem e a composição da MO (através de biomarcadores lipídicos) e a dinâmica da comunidade microbiana (método ATP) em sedimentos superficiais de diferentes ecossistemas marinhos da costa sudeste do Brasil: (i) margem continental de Cabo Frio; (ii) sistema lagunar de Saquarema; (iii) áreas costeiras e a plataforma continental de Ubatuba; (iv) e a plataforma adjacente ao estuário de Santos. Os resultados apontaram uma origem predominantemente autóctone para a MO nestes sistemas, com contribuição terrestre reduzida e limitada à áreas próximas à costa. Processos oceanográficos e forçantes ambientais são cruciais para a composição da MO sedimentar e são discutidas para cada um dos ecossistemas estudados.
Title in English
ORIGIN AND COMPOSITION OF THE ORGANIC MATTER AND THE MICROBIAL DYNAMICS IN SURFACE SEDIMENTS OF MARINE ECOSYSTEMS FROM THE SE BRAZILIAN COAST
Keywords in English
benthic microbial community
Carbon cycling in marine environments
lipid biomarkers
SE Brazilian coast.
sources of sedimentary organic matter
Abstract in English
The cycling of the organic matter (OM) in the marine environment is a key process in the global carbon cycle. Coastal sediments are important to the global carbon cycle, since they receive large inputs from both marine and terrestrial OM. The myriad of organic compounds and their spectrum of reactivity complicate the understanding of OM sources in coastal environments. In this work, we aimed to access the origin and composition of the OM (through lipid biomarkers) and the microbial dynamics (ATP method) in surface sediments of diverse marine ecosystems from the SE Brazilian coast: (i) the continental margin off Cabo Frio; (ii) the lagoonal system of Saquarema; (iii) coastal and shelf areas from Ubatuba; and (iv) the continental shelf adjacent to Santos estuary. The results showed a dominance of autochthonous OM, with a minor fraction of the OM derived from terrestrial sources and restricted to areas close to the coast. Oceanographic processes and environmental forces are crucial to the composition of sedimentary OM and are discussed for each of those ecosystems.
 
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MYY_Tese.pdf (4.76 Mbytes)
Publishing Date
2007-04-09
 
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