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    Quantifying photosynthetic rates of microphytobenthos using the triple isotope composition of dissolved oxygen

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    Date
    2013-07
    Author
    Stanley, Rachel H. R.  Concept link
    Howard, Evan M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6611
    As published
    https://doi.org/10.4319/lom.2013.11.360
    DOI
    10.4319/lom.2013.11.360
    Abstract
    Microphytobenthos are important mediators of nutrient and carbon fluxes in coastal environments. However, quantifying production rates by microphytobenthos is difficult, and existing methods necessitate perhaps erroneous assumptions that dark respiration equals light respiration. Here we present a new method for quantifying photosynthetic rates of microphytobenthos, i.e., gross primary production, by using the triple isotope composition of dissolved oxygen in benthic flux chambers. Because the triple oxygen isotope signature is sensitive to photosynthesis, but not to respiration, this method allows quantification of gross photosynthetic oxygen fluxes by microphytobenthos without assumptions about respiration. We present results from field experiments in Waquoit Bay, Massachusetts, that illustrate the method.
    Description
    Author Posting. © Association for the Sciences of Limnology and Oceanography, 2013. This article is posted here by permission of Association for the Sciences of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography: Methods 11 (2013): 360-373, doi:10.4319/lom.2013.11.360.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Limnology and Oceanography: Methods 11 (2013): 360-373
     
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