Data/hora: 16/06/2024 17:43:40

Biblioteca(s): | Embrapa Pantanal.
Tipo da produção científica: | Capítulo em Livro Técnico-Científico
Data corrente: | 08/03/2016
Data da última atualização: | 04/11/2016
Autoria: | BERGIER, I.; SILVA, A. P. S.; MONTEIRO, H. de C.; GUÉRIN, F.; MACEDO, H. A.; SILVA, A.; KRUSCHE, A.; SAWAKUCHI, H. O.; BASTVIKEN, D.
Afiliação: | IVAN BERGIER TAVARES DE LIMA, CPAP; Ana P. S. Silva, FEDERAL UNIVERSITY OF MATO GROSSO DO SUL; HERNANDES DE CAMPOS MONTEIRO, CPAP; FRÉDERIC GUÉRIN, UNIVERSITÉ DE TOULOUSE; Hudson A. Macedo, PAULISTA STATE UNIVERSITY; Aguinaldo Silva, FEDERAL UNIVERSITY OF MATO GROSSO DO SUL; Alex Krusche, UNIVERSITY OF SÃO PAULO; Henrique O. Sawakuchi, UNIVERSITY OF SÃO PAULO; David Bastviken, LINKÖPING UNIVERSITY.
Título: | Methane and carbon dioxide dynamics in the Paraguay River Floodplain (Pantanal) in episodic anoxia events.
Ano de publicação: | 2016
Fonte/Imprenta: | In: BERGIER, I.; ASSINE, M. L. (Ed.). Dynamics of the Pantanal Wetland in South America. Switzerland: Springer International Publishing, 2016.
Páginas: | p. 163-178.
Série: | (The Handbook of Environmental Chemistry, 37)
Idioma: | Inglês
Conteúdo: | Worldwide wetlands contribute to the global carbon cycle by emitting about a third of the global methane (CH4) emissions. However, CH4 and carbon dioxide (CO2) dynamics remain poorly understood in the largest tropical wetland on Earth, the Pantanal. In this chapter, we aim to characterize the CH4 and CO2 biogeochemistry in the floodplain of the Paraguay River, near Corumba´, during the course of annual anoxia phenomena locally known as dequada. The strong anoxia is associated to the flooding of terrestrial habitats that enhances respiration, dissolved oxygen (DO) consumption, and methanogenesis. The extremely low DO also leads to high fish mortality in the region. CH4 and CO2 concentration in surface waters and diffusive water-air fluxes were measured in the oxbow Tuiui' Lake and in the Paraguay River main stem in order to identify temporal and spatial patterns. The whole dataset shows that, for instance, dissolved CH4 and diffusive CH4 fluxes increased dramatically during the dequada. Riverine anoxic waters steadily penetrate the oxbow Tuiuiu' Lake, indicating water inflow from the river main stem, whereas small reminiscent patches of oxbow waters not mixing with anoxic river waters may function as survival refuges to the aquatic wildlife. Clearly, the DO distribution during several dequadas in major rivers of the Pantanal highlights the importance of geomorphology on the biogeochemistry in the riverine floodplains of the Pantanal wetland.
Palavras-Chave: | Ciclo do carbono; Dequada; Fish mortality; Flood pulse; Wetland.
Thesagro: | Carbono; Peixe.
Thesaurus Nal: | Carbon cycle; Fish behavior; Floodplains.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (59538-1) - UPC - PL - PP - PL2016.00007 -  - 2016.00007 - DIS