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  • Dissolved organic matter and metabolic dynamics in dryland lowland rivers

    Author(s)
    Holland, A
    McInerney, PJ
    Shackleton, ME
    Rees, GN
    Bond, NR
    Silvester, E
    Griffith University Author(s)
    Bond, Nick R.
    Year published
    2020
    Metadata
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    Abstract
    Dissolved organic matter (DOM) within freshwaters is essential for broad ecosystem function. The concentration and type of DOM within rivers depends on the relative contributions of allochthonous sources and the production and consumption of DOM by microbes. In this work we have examined the temporal patterns in DOM quality and productivity in three lowland rivers in dryland Australia using fluorescence excitation emission scans. We assessed the production and consumption of DOM within light and dark bottle assays to quantify the relative contribution of bacteria and algae to the DOM pool and simultaneously assessed whether ...
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    Dissolved organic matter (DOM) within freshwaters is essential for broad ecosystem function. The concentration and type of DOM within rivers depends on the relative contributions of allochthonous sources and the production and consumption of DOM by microbes. In this work we have examined the temporal patterns in DOM quality and productivity in three lowland rivers in dryland Australia using fluorescence excitation emission scans. We assessed the production and consumption of DOM within light and dark bottle assays to quantify the relative contribution of bacteria and algae to the DOM pool and simultaneously assessed whether the systems were autotrophic or heterotrophic. DOM varied temporally within the three river systems over the course of the study period. Characterisation of DOM within light and dark bottles following a 6-hour incubation revealed microbial consumption of a humic-like component and production of protein-like components similar in nature to the amino acids tryptophan and tyrosine. The lack of a significant difference in DOM quality between the light and dark bottles indicated that the protein-like DOM is likely derived from bacterial activity. Respiration was shown to be higher than gross primary production in both whole river and bottle assays, yielding negative net production values and demonstrating that these rivers were predominately heterotrophic. Our work suggests that bacterial metabolism of DOM may be a significant contributor to the production of protein-like components within heterotrophic freshwater systems.
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    Journal Title
    Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
    DOI
    https://doi.org/10.1016/j.saa.2019.117871
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Analytical chemistry
    Macromolecular and materials chemistry
    Physical chemistry
    Publication URI
    http://hdl.handle.net/10072/390859
    Collection
    • Journal articles

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