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  • Differential carbon acquisition, partitioning and release between coralline algae that evolved to occupy distinct light environments: strategies in the anthropocene

    Author(s)
    Bergstrom, Ellie
    Fry, Brian
    Page, Tessa M
    Diaz-Pulido, Guillermo
    Griffith University Author(s)
    Diaz-Pulido, Guillermo
    Year published
    2021
    Metadata
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    Abstract
    Crustose coralline algae (CCA) are active participants in the carbon cycle of reefs worldwide. However, mechanisms underpinning the flux of carbon into (acquisition), within (partitioning via photosynthesis and calcification) and out (DOC release) of the thalli of reef-building CCA is largely unknown. With the carbonate chemistry and temperature of seawater changing at rapid rates, the quantification of these patterns would provide an essential tool for understanding the underlying physiological strategies and responses to environmental change in CCA. We quantified carbon acquisition, partitioning, and release in two high-light ...
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    Crustose coralline algae (CCA) are active participants in the carbon cycle of reefs worldwide. However, mechanisms underpinning the flux of carbon into (acquisition), within (partitioning via photosynthesis and calcification) and out (DOC release) of the thalli of reef-building CCA is largely unknown. With the carbonate chemistry and temperature of seawater changing at rapid rates, the quantification of these patterns would provide an essential tool for understanding the underlying physiological strategies and responses to environmental change in CCA. We quantified carbon acquisition, partitioning, and release in two high-light (Porolithon cf. onkodes and Lithophyllum cf. insipidum) and low-light (Lithothamnion proliferum and Sporolithon cf. durum) species of CCA under ambient and elevated (IPCC RCP 8.5) levels of pCO2 and temperature. We found distinct ambient acquisition, partitioning, and release strategies between high- and low-light reef-builders. When faced with global stressors, there was an association in high-light CCA between decreased surficial carbon retention, increased DOC release, and failure to increase bicarbonate uptake for photosynthesis. In low-light CCA, there was an association between maintained or even increased carbon retention, reversal of DOC release (i.e. uptake, likely involving surface microbes), and increased bicarbonate uptake. Our results suggest that the surficial carbon metabolism of CCA occupying low-light reef environments is more robust than that of high-light reef-builders amidst OA and warming.
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    Conference Title
    Phycologia
    Volume
    60
    Issue
    sup 1
    Publisher URI
    https://www.tandfonline.com/doi/full/10.1080/00318884.2021.1922050
    Funder(s)
    ARC
    Grant identifier(s)
    DP160103071
    Subject
    Biological sciences
    Environmental sciences
    Science & Technology
    Life Sciences & Biomedicine
    Plant Sciences
    Marine & Freshwater Biology
    Carbon partitioning
    Publication URI
    http://hdl.handle.net/10072/407858
    Collection
    • Conference outputs

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