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    Exploring the ecosystem engineering ability of Red Sea shallow benthic habitats using stocks and fluxes in carbon biogeochemistry

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    Kimberlee Baldry Thesis.pdf
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    Description:
    Kimberlee Baldry Thesis
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    Type
    Thesis
    Authors
    Baldry, Kimberlee cc
    Advisors
    Duarte, Carlos M. cc
    Committee members
    McCabe, Matthew cc
    Jones, Burton cc
    Program
    Marine Science
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Date
    2017-12
    Embargo End Date
    2018-12-12
    Permanent link to this record
    http://hdl.handle.net/10754/626353
    
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    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2018-12-12.
    Abstract
    The coastal ocean is a marginal region of the global ocean, but is home to metabolically intense ecosystems which increase the structural complexity of the benthos. These ecosystems have the ability to alter the carbon chemistry of surrounding waters through their metabolism, mainly through processes which directly release or consume carbon dioxide. In this way, coastal habitats can engineer their environment by acting as sources or sinks of carbon dioxide and altering their environmental chemistry from the regional norm. In most coastal water masses, it is difficult to resolve the ecosystem effect on coastal carbon biogeochemistry due to the mixing of multiple offshore end members, complex geography or the influence of variable freshwater inputs. The Red Sea provides a simple environment for the study of ecosystem processes at a coastal scale as it contains only one offshore end-member and negligible freshwater inputs due to the arid climate of adjacent land. This work explores the ability of three Red Sea benthic coastal habitats (coral reefs, seagrass meadows and mangrove forests) to create characteristic ecosystem end-members, which deviate from the biogeochemistry of offshore source waters. This is done by both calculating non-conservative deviations in carbonate stocks collected over each ecosystem, and by quantifying net carbonate fluxes (in seagrass meadows and mangrove forests only) using 24 hour incubations. Results illustrate that carbonate stocks over ecosystems conform to broad ecosystem trends, which are different to the offshore end-member, and are influenced by inherited properties from surrounding ecosystems. Carbonate fluxes also show ecosystem dependent trends and further illustrate the importance of sediment processes in influencing CaCO3 fluxes in blue carbon benthic habitats, which warrants further attention. These findings show the respective advantages of studying both carbonate stocks and fluxes of coastal benthic ecosystems in order to understand the spatial, temporal and net effects of their metabolism on the coastal ocean.
    Citation
    Baldry, K. (2017). Exploring the ecosystem engineering ability of Red Sea shallow benthic habitats using stocks and fluxes in carbon biogeochemistry. KAUST Research Repository. https://doi.org/10.25781/KAUST-34U05
    DOI
    10.25781/KAUST-34U05
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-34U05
    Scopus Count
    Collections
    Biological and Environmental Science and Engineering (BESE) Division; Marine Science Program; MS Theses

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