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    Correlations between biomarkers of varying bioavailability and putative hydrocarbonoclastic bacteria in an Early-Eocene marlstone sedimentary record

    Access Status
    Fulltext not available
    Embargo Lift Date
    2024-04-06
    Authors
    Wang, Danlei
    Coolen, Marco
    Idiz, E.
    Holman, Alex
    Hopper, Peter
    Cockell, C.S.
    Grice, Kliti
    Date
    2022
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, D. and Coolen, M.J.L. and Idiz, E. and Holman, A.I. and Hopper, P. and Cockell, C.S. and Grice, K. 2022. Correlations between biomarkers of varying bioavailability and putative hydrocarbonoclastic bacteria in an Early-Eocene marlstone sedimentary record. Organic Geochemistry. 167: ARTN 104409.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2022.104409
    ISSN
    0146-6380
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP190100982
    URI
    http://hdl.handle.net/20.500.11937/90146
    Collection
    • Curtin Research Publications
    Abstract

    We examined the possibility that, during short-term refrigerated storage, microbial communities continue to biodegrade individual lipid biomarkers in an intact core section of Early Eocene consolidated marlstone sediments from the hydrothermal system overlying the Chicxulub impact crater (Yucatán, Mexico). Amplicon sequencing of environmental 16S rRNA obtained from the core samples revealed a high relative abundance of amplicon sequence variants (ASVs) related to known hydrocarbon degraders, notably Halomonas and Marinobacter. Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt2) predicted that Marinobacter and a subset of less abundant bacteria (e.g., Alcanivorax) have the genomic potential to anaerobically degrade hydrocarbons via dissimilatory nitrate reduction to ammonia. The variability in the relative abundance of these taxa showed strong positive Pearson correlations (Pearson's r > 0.5) with quantitative changes in the most bioavailable non-sulfurized compounds, notably polycyclic aromatic hydrocarbons (PAHs) and isorenieratane. Moderate positive Pearson correlations (r values between ∼0.3 and ∼0.5) were observed between microbial taxa and compounds that have undergone early abiotic diagenetic sulfurization (e.g., hopanes, n-alkanes and steranes). These results suggest that non-sulfurized biomarkers may be subject to continued biodegradation in marine sedimentary rocks during short-term refrigerated storage.

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