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  • Combined analyses of O2 and CO2 for studying the coupling of photosynthesis and respiration in aquatic systems

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    Author(s)
    Wissel, Björn
    J. Quiñones-Rivera, Zoraida
    Fry, Brian
    Griffith University Author(s)
    Fry, Brian D.
    Year published
    2008
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    Abstract
    To simultaneously elucidate patterns of photosynthesis and respiration in aquatic systems, we developed a new gas-switching system for coupled measurements of dissolved metabolic gases. The methodology involves two gas chromatography columns to perform multiple gas separations. The first example using 24 h bottle incubations in estuarine waters showed a 1:1 molar relationship for the coupling between CO2 and O2 in closed systems during photosynthesis and respiration. In a second, open system application using depth-stratified sampling on the Louisiana continental shelf, deviations from this 1:1 relationship between CO2 and ...
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    To simultaneously elucidate patterns of photosynthesis and respiration in aquatic systems, we developed a new gas-switching system for coupled measurements of dissolved metabolic gases. The methodology involves two gas chromatography columns to perform multiple gas separations. The first example using 24 h bottle incubations in estuarine waters showed a 1:1 molar relationship for the coupling between CO2 and O2 in closed systems during photosynthesis and respiration. In a second, open system application using depth-stratified sampling on the Louisiana continental shelf, deviations from this 1:1 relationship between CO2 and O2 were common. In surface waters, depletion of CO2 exceeded excess O2, likely owing to different gas-exchange rates with the atmosphere. In bottom waters, CO2 accumulation could surpass O2 losses, indicating anaerobic respiration. At intermediate depths, CO2 and O2 dynamics followed the 1:1 relationship that was observed in the closed incubations. This approach clearly showed that CO2 and O2 dynamics were tightly coupled on short-time scales, but anaerobic respiration and physical processes such as gas exchange can lead to strong divergence of CO2 and O2 stoichiometries. This combined analysis of respiratory gases that is readily achievable with isotope ratio mass spectrometer systems illustrates how oxygen and carbon cycles are coupled and decoupled in aquatic systems.
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    Journal Title
    Canadian Journal of Fisheries and Aquatic Sciences
    Volume
    65
    Issue
    11
    DOI
    https://doi.org/10.1139/F08-146
    Copyright Statement
    © 2008 NRC Research Press. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Ecosystem Function
    Ecology
    Zoology
    Fisheries Sciences
    Publication URI
    http://hdl.handle.net/10072/59666
    Collection
    • Journal articles

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