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Seasonal and diel modulation of DOM in a mangrove-dominated estuary.
Vidal, L O; Lambert, T; Cotovicz, L C; Bernardes, M C; Sobrinho, R; Thompson, F; Garcia, G D; Knoppers, B A; Gatts, P V; Régis, C R; Abril, G; Rezende, C E.
Afiliação
  • Vidal LO; Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brazil; Programa de Pós-graduação em Ecologia e Recursos Naturais, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brazil. Electronic
  • Lambert T; Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland.
  • Cotovicz LC; Department of Marine Chemistry, Leibniz Institute for Baltic Sea Research, Warnemunde, Germany; Instituto de Ciências do Mar, Universidade Federal do Ceará (UFC), Fortaleza, Brazil.
  • Bernardes MC; Programa de Geoquímica, Universidade Federal Fluminense, Niterói, RJ, Brazil.
  • Sobrinho R; Programa de Geoquímica, Universidade Federal Fluminense, Niterói, RJ, Brazil.
  • Thompson F; Laboratório de Microbiologia, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Brazil.
  • Garcia GD; Laboratório de Microbiologia, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Brazil.
  • Knoppers BA; Programa de Geoquímica, Universidade Federal Fluminense, Niterói, RJ, Brazil.
  • Gatts PV; Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brazil.
  • Régis CR; Programa de Geoquímica, Universidade Federal Fluminense, Niterói, RJ, Brazil.
  • Abril G; Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), UMR 8067, Muséum National d'Histoire Naturelle, CNRS, IRD, SU, UCN, UA, Paris, France.
  • Rezende CE; Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, Brazil. Electronic address: crezende@uenf.br.
Sci Total Environ ; 857(Pt 1): 159045, 2023 Jan 20.
Article em En | MEDLINE | ID: mdl-36181816
ABSTRACT
Rivers and estuaries are the main links between continents and oceans. The Paraíba do Sul River is among the most important rivers of the southeastern Brazilian region, carrying an average of 0.08 Tg of dissolved organic matter (DOM) to the ocean but has been facing significant changes in river discharge. In this study, we aimed to provide insights into the sources and transformations of chromophoric dissolved organic matter (CDOM) and fluorescent dissolved organic matter (FDOM) sources across a salinity gradient under changing river discharge scenarios. Three spatial surveys were performed covering the entire salinity gradient of the main estuarine channel and surrounding mangrove waters under contrasting river discharge (178 to 1240 m3 s-1), and diel sampling was conducted in the mangrove tidal creek. The characterization of DOM through the parallel factor analysis (PARAFAC) model identified six components across the river-ocean gradient and mangrove creek terrestrial origin (C1 - fulvic acid and C2 and C3 - humic-like), protein-like (C4), tryptophan-like (C5), and tyrosine-like (C6). Our results showed a shift in DOM composition and contribution along the salinity gradient, from terrestrial (C3) to autochthonous (C5 and C6) signatures. The October-17 dry campaign was characterized by a higher proportion of microbial protein-like component C4 and a lower contribution of humic-like components compared to February-17 and March-18 across the salinity gradient with an increase in the mixing zone. The DOM compositions of the February 17 dry and March 18 wet campaigns were similar. Additionally, the March-18 wet campaign, marked by the highest river discharge, showed higher inputs of terrestrial DOM (C1-C3 components) compared to February-17 in the estuary, which allowed DOM to be transported rather than transformed. The mangrove diel study showed that tidal fluctuations are also an important driver of carbon input to the mangrove creek with a possible impact on DOM composition in estuarine waters.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Estuários / Matéria Orgânica Dissolvida País/Região como assunto: Asia Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Estuários / Matéria Orgânica Dissolvida País/Região como assunto: Asia Idioma: En Ano de publicação: 2023 Tipo de documento: Article