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  • Ecosystem respiration: Drivers of daily variability and background respiration in lakes around the globe

    Author(s)
    Solomon, Christopher T
    Bruesewitz, Denise A
    Richardson, David C
    Rose, Kevin C
    Van de Bogert, Matthew C
    Hanson, Paul C
    Kratz, Timothy K
    Larget, Bret
    Adrian, Rita
    Babin, Brenda Leroux
    Chiu, Chih-Yu
    Hamilton, David P
    Gaiser, Evelyn E
    Hendricks, Susan
    Istvanovics, Vera
    Laas, Alo
    O'Donnell, David M
    Pace, Michael L
    Ryder, Elizabeth
    Staehr, Peter A
    Torgersen, Thomas
    Vanni, Michael J
    Weathers, Kathleen C
    Zhu, Guangwei
    Griffith University Author(s)
    Hamilton, David P.
    Year published
    2013
    Metadata
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    Abstract
    We assembled data from a global network of automated lake observatories to test hypotheses regarding the drivers of ecosystem metabolism. We estimated daily rates of respiration and gross primary production (GPP) for up to a full year in each lake, via maximum likelihood fits of a free-water metabolism model to continuous high-frequency measurements of dissolved oxygen concentrations. Uncertainties were determined by a bootstrap analysis, allowing lake-days with poorly constrained rate estimates to be down-weighted in subsequent analyses. GPP and respiration varied considerably among lakes and at seasonal and daily timescales. ...
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    We assembled data from a global network of automated lake observatories to test hypotheses regarding the drivers of ecosystem metabolism. We estimated daily rates of respiration and gross primary production (GPP) for up to a full year in each lake, via maximum likelihood fits of a free-water metabolism model to continuous high-frequency measurements of dissolved oxygen concentrations. Uncertainties were determined by a bootstrap analysis, allowing lake-days with poorly constrained rate estimates to be down-weighted in subsequent analyses. GPP and respiration varied considerably among lakes and at seasonal and daily timescales. Mean annual GPP and respiration ranged from 0.1 to 5.0 mg O2 L−1 d−1 and were positively related to total phosphorus but not dissolved organic carbon concentration. Within lakes, significant day-to-day differences in respiration were common despite large uncertainties in estimated rates on some lake-days. Daily variation in GPP explained 5% to 85% of the daily variation in respiration after temperature correction. Respiration was tightly coupled to GPP at a daily scale in oligotrophic and dystrophic lakes, and more weakly coupled in mesotrophic and eutrophic lakes. Background respiration ranged from 0.017 to 2.1 mg O2 L−1 d−1 and was positively related to indicators of recalcitrant allochthonous and autochthonous organic matter loads, but was not clearly related to an indicator of the quality of allochthonous organic matter inputs.
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    Journal Title
    Limnology and Oceanography
    Volume
    58
    Issue
    3
    DOI
    https://doi.org/10.4319/lo.2013.58.3.0849
    Subject
    Ecological Applications not elsewhere classified
    Earth Sciences
    Environmental Sciences
    Biological Sciences
    Publication URI
    http://hdl.handle.net/10072/337285
    Collection
    • Journal articles

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