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Title

Submarine mud volcanoes as a source of chromophoric dissolved organic matter to the deep waters of the Gulf of Cádiz

AuthorsAmaral, Valentina; Romera-Castillo, Cristina CSIC ORCID ; Forja, Jesús M.
Issue DateFeb-2021
PublisherNature Publishing Group
CitationScientific Reports 11: 3200 (2021)
AbstractSeafloor structures related to the emission of different fluids, such as submarine mud volcanoes (MVs), have been recently reported to largely contribute with dissolved organic matter (DOM) into the oceans. Submarine MVs are common structures in the Gulf of Cádiz. However, little is known about the biogeochemical processes that occur in these peculiar environments, especially those involving DOM. Here, we report DOM characterization in the sediment pore water of three MVs of the Gulf of Cádiz. Estimated benthic fluxes of dissolved organic carbon (DOC) and chromophoric DOM (CDOM) were higher than in other marine sediments with an average of 0.11 ± 0.04 mmol m−2 d−1 for DOC and ranging between 0.11 and 2.86 m−1 L m−2 d−1, for CDOM. Protein-like components represented ~ 70% of the total fluorescent DOM (FDOM). We found that deep fluids migration from MVs (cold seeps) and anaerobic production via sulfate-reducing bacteria represent a source of DOC and FDOM to the overlying water column. Our results also indicate that fluorescent components can have many diverse sources not captured by common classifications. Overall, MVs act as a source of DOC, CDOM, and FDOM to the deep waters of the Gulf of Cádiz, providing energy to the microbial communities living there
Description12 pages, 6 figures, 5 tables, supplementary information https://doi.org/10.1038/s41598-021-82632-3.-- The datasets generated during the current study are available from the corresponding author on reasonable request
Publisher version (URL)https://doi.org/10.1038/s41598-021-82632-3
URIhttp://hdl.handle.net/10261/239639
DOI10.1038/s41598-021-82632-3
Identifierse-issn: 2045-2322
Appears in Collections:(ICM) Artículos

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