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    Original Research Papers

    Spatial and seasonal variations in the stable carbon isotopic composition of methane in stream sediments of eastern Amazonia

    Authors:

    José Mauro Sousa Moura ,

    Centro de Energia Nuclear na Agricultura –CENA/USP, Avenida Centenário, 303, São Dimas, 13416-903, Piracicaba, SP, BR
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    Christopher S. Martens,

    Department of Marine Sciences, CB-3300, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3300, US
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    Marcelo Zacharias Moreira,

    Centro de Energia Nuclear na Agricultura –CENA/USP, Avenida Centenário, 303, São Dimas, 13416-903, Piracicaba, SP, BR
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    Risonaldo Leal Lima,

    Projeto LBA-ECO, Rua Vera Paz, S/N, Salé, 68040-260, Santarém, PA, BR
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    Irene Cibelle Gonçalves Sampaio,

    Projeto LBA-ECO, Rua Vera Paz, S/N, Salé, 68040-260, Santarém, PA, BR
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    Howard P. Mendlovitz,

    Department of Marine Sciences, CB-3300, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3300, US
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    Mary C. Menton

    Center for Latin American Studies, University of Florida, 319 Grinter Hall PO Box 115530, Gainesville, Florida 32611-5530, US
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    Abstract

    The stable carbon isotopic composition of methane (δ13C-CH4) gas bubbles formed in the sediments of three Amazonian streamswas determined over a 5-yr period. The study sites were two ‘várzea’ floodplain (Açu and Maicá) and one ‘terrafirme’ (Jamaraquá) streams. The δ13C of sedimentary organic matter (SOM) from the surrounding vegetation and bottom sediments were also determined. The mean δ13C value of SOM was lower in the terra-firme (–29.6‰) than in the várzea stream (–23.8‰) as a result of less C4 plant deposition in the former. The δ13C-CH4 values varied systematically both seasonally and spatially among the sites during all 5 yr of the study, in association with changes during hydrologic cycle. Overall, the variation in values of δ13C-CH4 during the high water phase covered a narrower range of values, –63 to –56‰. Contrastively, during the low water phase the δ13C-CH4 values for várzea and terra-firme streams are different and are in direct opposition. At this phase, the δ13C-CH4 at terra-firme stream is at least 20‰ depleted of 13C compared to várzea streams. Changes in organic matter sources, water levels and associated microbial degradation processes control the observed seasonal and spatial variations in net stable carbon isotopic composition of methane.

    How to Cite: Moura, J.M.S., Martens, C.S., Moreira, M.Z., Lima, R.L., Sampaio, I.C.G., Mendlovitz, H.P. and Menton, M.C., 2008. Spatial and seasonal variations in the stable carbon isotopic composition of methane in stream sediments of eastern Amazonia. Tellus B: Chemical and Physical Meteorology, 60(1), pp.21–31. DOI: http://doi.org/10.1111/j.1600-0889.2007.00322.x
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      Published on 01 Jan 2008
    Peer Reviewed
     CC BY 4.0
     Accepted on 14 Aug 2007            Submitted on 6 Dec 2006

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