Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?

Abstract Despite of the major role ascribed to marine dissolved organic matter (DOM) in the global carbon cycle, the reactivity of this pool in the dark ocean is still poorly understood. Present hypotheses, posed within the size-reactivity continuum (SRC) and the microbial carbon pump (MCP) conceptu...

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Autores principales:	Alba María Martínez-Pérez, Xosé Antón Álvarez-Salgado, Javier Arístegui, Mar Nieto-Cid
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bb3c460f61064252a74cd98c06625e4c
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spelling	oai:doaj.org-article:bb3c460f61064252a74cd98c06625e4c2021-12-02T16:07:58ZDeep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?10.1038/s41598-017-05941-62045-2322https://doaj.org/article/bb3c460f61064252a74cd98c06625e4c2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05941-6https://doaj.org/toc/2045-2322Abstract Despite of the major role ascribed to marine dissolved organic matter (DOM) in the global carbon cycle, the reactivity of this pool in the dark ocean is still poorly understood. Present hypotheses, posed within the size-reactivity continuum (SRC) and the microbial carbon pump (MCP) conceptual frameworks, need further empirical support. Here, we provide field evidence of the soundness of the SRC model. We sampled the high salinity core-of-flow of the Levantine Intermediate Water along its westward route through the entire Mediterranean Sea. At selected sites, DOM was size-fractionated in apparent high (aHMW) and low (aLMW) molecular weight fractions using an efficient ultrafiltration cell. A percentage decline of the aHMW DOM from 68–76% to 40–55% was observed from the Levantine Sea to the Strait of Gibraltar in parallel with increasing apparent oxygen utilization (AOU). DOM mineralization accounted for 30 ± 3% of the AOU, being the aHMW fraction solely responsible for this consumption, verifying the SRC model in the field. We also demonstrate that, in parallel to this aHMW DOM consumption, fluorescent humic-like substances accumulate in both fractions and protein-like substances decline in the aLMW fraction, thus indicating that not only size matters and providing field support to the MCP model.Alba María Martínez-PérezXosé Antón Álvarez-SalgadoJavier ArísteguiMar Nieto-CidNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alba María Martínez-Pérez Xosé Antón Álvarez-Salgado Javier Arístegui Mar Nieto-Cid Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?
description	Abstract Despite of the major role ascribed to marine dissolved organic matter (DOM) in the global carbon cycle, the reactivity of this pool in the dark ocean is still poorly understood. Present hypotheses, posed within the size-reactivity continuum (SRC) and the microbial carbon pump (MCP) conceptual frameworks, need further empirical support. Here, we provide field evidence of the soundness of the SRC model. We sampled the high salinity core-of-flow of the Levantine Intermediate Water along its westward route through the entire Mediterranean Sea. At selected sites, DOM was size-fractionated in apparent high (aHMW) and low (aLMW) molecular weight fractions using an efficient ultrafiltration cell. A percentage decline of the aHMW DOM from 68–76% to 40–55% was observed from the Levantine Sea to the Strait of Gibraltar in parallel with increasing apparent oxygen utilization (AOU). DOM mineralization accounted for 30 ± 3% of the AOU, being the aHMW fraction solely responsible for this consumption, verifying the SRC model in the field. We also demonstrate that, in parallel to this aHMW DOM consumption, fluorescent humic-like substances accumulate in both fractions and protein-like substances decline in the aLMW fraction, thus indicating that not only size matters and providing field support to the MCP model.
format	article
author	Alba María Martínez-Pérez Xosé Antón Álvarez-Salgado Javier Arístegui Mar Nieto-Cid
author_facet	Alba María Martínez-Pérez Xosé Antón Álvarez-Salgado Javier Arístegui Mar Nieto-Cid
author_sort	Alba María Martínez-Pérez
title	Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?
title_short	Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?
title_full	Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?
title_fullStr	Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?
title_full_unstemmed	Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?
title_sort	deep-ocean dissolved organic matter reactivity along the mediterranean sea: does size matter?
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/bb3c460f61064252a74cd98c06625e4c
work_keys_str_mv	AT albamariamartinezperez deepoceandissolvedorganicmatterreactivityalongthemediterraneanseadoessizematter AT xoseantonalvarezsalgado deepoceandissolvedorganicmatterreactivityalongthemediterraneanseadoessizematter AT javieraristegui deepoceandissolvedorganicmatterreactivityalongthemediterraneanseadoessizematter AT marnietocid deepoceandissolvedorganicmatterreactivityalongthemediterraneanseadoessizematter
_version_	1718384681713401856

Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?

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