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dc.contributor.authorAparicio, Francisco Luises_ES
dc.contributor.authorNieto-Cid, Mares_ES
dc.contributor.authorBorrull, Encarnaciónes_ES
dc.contributor.authorRomero, Estelaes_ES
dc.contributor.authorStedmon, C.es_ES
dc.contributor.authorSala, M. Montserrates_ES
dc.contributor.authorGasol, Josep M.es_ES
dc.contributor.authorRíos, Aida F.es_ES
dc.contributor.authorMarrasé, Cèliaes_ES
dc.identifier.citationFrontiers in Marine Science 2: 106 (2015)es_ES
dc.description14 páginas, 8 figuras, 4 tablas.-- This is an open-access article distributed under the terms of the Creative Commons Attribution License (CCBY)es_ES
dc.description.abstractThe refractory nature of marine dissolved organic matter (DOM) increases while it travels from surface waters to the deep ocean. This resistant fraction is in part composed of fluorescent humic-like material, which is relatively difficult to metabolize by deep water prokaryotes, and it can also be generated by microbial activity. It has been recently argued that microbial production of new fluorescent DOM (FDOM) requires the presence of humic precursors in the surrounding environment. In order to experimentally test how the chemical quality of the available organic compounds influences the production of new FDOM, three experiments were performed with bathypelagic Atlantic waters. Microbial communities were incubated in three treatments which differed in the quality of the organic compounds added: (i) glucose and acetate; (ii) glucose, acetate, essential amino acids, and humic acids; and (iii) humic acids alone. The response of the prokaryotes and the production of FDOM were simultaneously monitored. Prokaryotic abundance was highest in treatments where labile compounds were added. The rate of humic-like fluorescence production, scaled to prokaryotic abundance, varied depending on the quality of the additions. The precursor compounds affected the generation of new humic-like FDOM, and the cell-specific production of this material was higher in the incubations amended with humic precursors. Furthermore, we observed that the protein-like fluorescence decreased only when fresh amino acids were added. These findings contribute to the understanding of FDOM variability in deep waters and provide valuable information for studies where fluorescent compounds are used in order to track water masses and/or microbial processeses_ES
dc.description.sponsorshipThe experiments have been possible thanks to the funding of projects STORM (Structure of Organic Matter: Biogeochemical and Ecological Implications, CTM2009-09352) and DOREMI (Dissolved Organic Matter Remineralization in the Ocean: Microbial and Biogeochemical Constraints, CTM2012-342949) from the Spanish Ministerio de Economía y Competitividad. FA, benefited of a JAE-pre pre-doctoral fellowship from the Consejo Superior de Investigaciones Científicas (CSIC). MN-C was funded by the CSIC Program “Junta para la Ampliación de Estudios” co-financed by the ESF. CS acknowledges funding from the Danish Research Council for Independent Research (DFF 1323-00336)es_ES
dc.publisherFrontiers Mediaes_ES
dc.relation.isversionofPublisher's versiones_ES
dc.subjectDeep seaes_ES
dc.subjectOrganic matteres_ES
dc.titleMicrobially-Mediated Fluorescent Organic Matter Transformations in the Deep Ocean. Do the Chemical Precursors Matter?es_ES
dc.description.peerreviewedPeer reviewedes_ES
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