Molecular links between whitesand ecosystems and blackwater formation in the Rio Negro watershed

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorMax Planck Institute for Biogeochemistry (MPI-BGC)-
Autor(es): dc.contributorETH Zürich-
Autor(es): dc.contributorInstituto Nacional de Pesquisas da Amazônia (INPA)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorMax Planck Institute for Biogeochemistry-
Autor(es): dc.contributorVermont Agricultural and Environmental Laboratory-
Autor(es): dc.creatorSimon, C.-
Autor(es): dc.creatorPimentel, T. P.-
Autor(es): dc.creatorMonteiro, M. T.F.-
Autor(es): dc.creatorCandido, L. A.-
Autor(es): dc.creatorGastmans, D.-
Autor(es): dc.creatorGeilmann, H.-
Autor(es): dc.creatorda Costa Oliveira, R.-
Autor(es): dc.creatorRocha, J. B.-
Autor(es): dc.creatorPires, E.-
Autor(es): dc.creatorQuesada, C. A.-
Autor(es): dc.creatorForsberg, B. R.-
Autor(es): dc.creatorFerreira, S. J.F.-
Autor(es): dc.creatorda Cunha, H. B.-
Autor(es): dc.creatorGleixner, G.-
Data de aceite: dc.date.accessioned2025-08-21T18:03:35Z-
Data de disponibilização: dc.date.available2025-08-21T18:03:35Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2021-10-15-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.gca.2021.06.036-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/229267-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/229267-
Descrição: dc.descriptionTropical rivers such as the Rio Negro constitute a major portion of the global aquatic flux of dissolved organic carbon (DOC) entering the ocean, but the exact amount, source contributions and fate of terrestrial DOC remain unknown. We investigated the role of valley and upland whitesand ecosystems (WSEs) and terra firme plateaus in forming blackwater tributaries in the Rio Negro basin to develop novel constraints for the terrestrial export of carbon. 5709 molecular markers from ground- and surface waters of two contrasting valley and upland sites feeding Rio Negro tributaries were identified by ultrahigh resolution mass spectrometry (FT-MS), analyzed by multivariate statistics and compared to known Rio Negro markers. In a Principal Coordinates Analysis, valley and upland DOC molecular composition differed by 78% from plateau DOC, which was characterized by reworked, aliphatic and unsaturated N- and S-containing molecules, while valley and upland DOC contained mainly condensed aromatics, aromatics and oxidized unsaturated structures. Valley and upland samples differed by 10% in molecular DOC composition and by their isotopic content (14C of SPE-DOC, 18O and 2H of water) which indicated differences in hydrology and C turnover. Against expectation, markers of widespread whitesand valleys did not emerge as a major source of Rio Negro markers, but specific upland markers did. Pubchem suggested chromene and benzofuran structures as promising candidates for further study. Our findings indicate that the export of molecular markers diverges from expected transport-limited DOC behavior, and thereby opens new avenues for source annotation beyond DOC quantity. Terrestrial DOC from upland whitesand areas is a major source of specific blackwater molecules missing in the regional ecosystem C balance, whereas C export from the whitesand valleys and especially from terra firme plateaus represents mainly recycled and transformed carbon not directly affecting the ecosystem C balance and possibly, the watersheds downstream molecular signature. Our study highlights the potential of high-resolution techniques to constrain carbon balances of ecosystems and landscapes by novel molecular markers. A comparison with other terrestrial DOM datasets indicated molecular similarities with temperate acidic soils and tropical rivers that warrant further analysis of common DOM markers. Implications, limitations, and future challenges are discussed in the light of potential applications of diagnostic molecular links for DOC source annotation and estimation of terrestrial DOM export in the land-to-ocean continuum.-
Descrição: dc.descriptionMolecular Biogeochemistry Max Planck Institute for Biogeochemistry (MPI-BGC), Hans Knöll-Str. 10-
Descrição: dc.descriptionInstitute of Biogeochemistry and Pollutant Dynamics (IBP) ETH Zürich, Universitätstrasse 16-
Descrição: dc.descriptionCoordenação de Dinâmica Ambiental (CODAM) Instituto Nacional de Pesquisas da Amazônia (INPA), Av. Efigênio Sales 2239, Aleixo-
Descrição: dc.descriptionSão Paulo State University (UNESP) Centro de Estudos Ambientais, Av. 24A, 1515, Bela Vista, Rio Claro-
Descrição: dc.descriptionStable Isotope Laboratory (BGC-IsoLab) Max Planck Institute for Biogeochemistry, Hans Knöll-Str. 10-
Descrição: dc.descriptionVermont Agricultural and Environmental Laboratory, 163 Admin Dr, Randoph Center-
Descrição: dc.descriptionSão Paulo State University (UNESP) Centro de Estudos Ambientais, Av. 24A, 1515, Bela Vista, Rio Claro-
Formato: dc.format274-291-
Idioma: dc.languageen-
Relação: dc.relationGeochimica et Cosmochimica Acta-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectBiomarker-
Palavras-chave: dc.subjectChemodiversity-
Palavras-chave: dc.subjectCritical zone-
Palavras-chave: dc.subjectDissolved organic matter-
Palavras-chave: dc.subjectHydrochemistry-
Palavras-chave: dc.subjectLand-to-ocean continuum-
Palavras-chave: dc.subjectRiver basin-
Palavras-chave: dc.subjectSoil organic matter-
Palavras-chave: dc.subjectWatershed-
Título: dc.titleMolecular links between whitesand ecosystems and blackwater formation in the Rio Negro watershed-
Tipo de arquivo: dc.typelivro digital-
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