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    Identification of organic matter sources in sulfidic late Holocene Antarctic fjord sediments from fossil rDNA sequence analysis

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    2006PA001309.pdf (706.3Kb)
    Date
    2007-05-09
    Author
    Coolen, Marco J. L.  Concept link
    Volkman, John K.  Concept link
    Abbas, Ben  Concept link
    Muyzer, Gerard  Concept link
    Schouten, Stefan  Concept link
    Sinninghe Damste, Jaap S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3447
    As published
    https://doi.org/10.1029/2006PA001309
    DOI
    10.1029/2006PA001309
    Keyword
     Ancient DNA; Diatoms; Ellis Fjord 
    Abstract
    The 18S ribosomal DNA (rDNA) isolated from sulfidic Holocene sediments and particulate organic matter in the water column of the stratified Small Meromictic Basin (SMB) in Ellis Fjord (eastern Antarctica) was analyzed to identify possible biological sources of organic matter. Previous work had shown that the sediments contained numerous diatom frustules and high contents of a highly branched isoprenoid (HBI) C25:2 alkene (which is a specific biomarker of certain species of the diatom genera Navicula, Haslea, Pleurosigma, or Rhizosolenia), so we focused our search on preserved fossil 18S rDNA of diatoms using sensitive polymerase chain reaction (PCR) approaches. We did not find diatom-derived fossil 18S rDNA using general eukaryotic primers, and even when we used primers selective for diatom 18S rDNA, we only identified a Chaetoceros phylotype, which is known to form cysts in the SMB but is not a likely source of the C25:2 HBI. When we used PCR/denaturing gradient gel electrophoresis methods specific to phylotypes within the HBI-biosynthesizing genera, we were able to identify three phylotypes in the sediments related to HBI-producing strains of the genera Haslea and Navicula. The ancient DNA data thus provided a limited, but valuable, view of the diversity of late Holocene primary producers with a particular bias to specific components of the biota that were better preserved such as the Chaetoceros cysts. This use of paleogenetics also revealed unexpected possible sources of organic matter such as novel stramenopiles for which no specific lipid biomarkers are known and thus would not have been identified based on traditional lipid stratigraphy alone.
    Description
    Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 22 (2007): PA2211, doi:10.1029/2006PA001309.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Paleoceanography 22 (2007): PA2211
     

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