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    Ubiquitous healthy diatoms in the deep sea confirm deep carbon injection by the biological pump

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    Type
    Article
    Authors
    Agusti, Susana cc
    González-Gordillo, J. I.
    Vaqué, D.
    Estrada, M.
    Cerezo, M. I.
    Salazar, G.
    Gasol, J. M.
    Duarte, Carlos M. cc
    KAUST Department
    Red Sea Research Center (RSRC)
    Date
    2015-07-09
    Permanent link to this record
    http://hdl.handle.net/10754/560370
    
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    Abstract
    The role of the ocean as a sink for CO2 is partially dependent on the downward transport of phytoplankton cells packaged within fast-sinking particles. However, whether such fast-sinking mechanisms deliver fresh organic carbon down to the deep bathypelagic sea and whether this mechanism is prevalent across the ocean requires confirmation. Here we report the ubiquitous presence of healthy photosynthetic cells, dominated by diatoms, down to 4,000 m in the deep dark ocean. Decay experiments with surface phytoplankton suggested that the large proportion (18%) of healthy photosynthetic cells observed, on average, in the dark ocean, requires transport times from a few days to a few weeks, corresponding to sinking rates (124–732 m d−1) comparable to those of fast-sinking aggregates and faecal pellets. These results confirm the expectation that fast-sinking mechanisms inject fresh organic carbon into the deep sea and that this is a prevalent process operating across the global oligotrophic ocean.
    Citation
    Ubiquitous healthy diatoms in the deep sea confirm deep carbon injection by the biological pump 2015, 6:7608 Nature Communications
    Publisher
    Nature Publishing Group
    Journal
    Nature Communications
    ISSN
    2041-1723
    DOI
    10.1038/ncomms8608
    PubMed ID
    26158221
    Additional Links
    http://www.nature.com/doifinder/10.1038/ncomms8608
    ae974a485f413a2113503eed53cd6c53
    10.1038/ncomms8608
    Scopus Count
    Collections
    Articles; Red Sea Research Center (RSRC); Plankton Genomics, part of the Global Ocean Genome Project

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