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    Heterotrophic bacterioplankton responses in coral- and algae-dominated Red Sea reefs show they might benefit from future regime shift

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    Hetero-heterotrophic.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Silva, Luis cc
    Calleja Cortes, Maria de Lluch
    Ivetic, Snjezana
    Huete-Stauffer, Tamara cc
    Roth, Florian cc
    Carvalho, Susana cc
    Moran, Xose Anxelu G. cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Microbial oceanography Research Group
    Red Sea Research Center (RSRC)
    Date
    2020-08-16
    Online Publication Date
    2020-08-16
    Print Publication Date
    2021-01
    Embargo End Date
    2022-08-16
    Submitted Date
    2020-04-20
    Permanent link to this record
    http://hdl.handle.net/10754/664644
    
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    Abstract
    In coral reefs, dissolved organic matter (DOM) cycling is a critical process for sustaining ecosystem functioning. However, global and local stressors have caused persistent shifts from coral- to algae-dominated benthic communities. The influence of such phase shifts on DOM nature and its utilization by heterotrophic bacterioplankton remains poorly studied. Every second month for one year, we retrieved seawater samples enriched in DOM produced by coral- and algae-dominated benthic communities in a central Red Sea reef during a full annual cycle. Seawater incubations were conducted in the laboratory under in situ temperature and light conditions by inoculating enriched DOM samples with bacterial assemblages collected in the surrounding waters. Dissolved organic carbon (DOC) concentrations were higher in the warmer months (May–September) in both communities, resulting in higher specific growth rates and bacterial growth efficiencies (BGE). However, these high summer values were significantly enhanced in algal-DOM relative to coral-DOM, suggesting the potential for bacterioplankton biomass increase in reefs with algae replacing healthy coral cover under warmer conditions. The potential exacerbation of heterotrophic bacterial activity in the ongoing widespread regime shift from coral- to algae-dominated communities may have detrimental consequences for the overall health of tropical coral reefs.
    Citation
    Silva, L., Calleja, M. L., Ivetic, S., Huete-Stauffer, T., Roth, F., Carvalho, S., & Morán, X. A. G. (2020). Heterotrophic bacterioplankton responses in coral- and algae-dominated Red Sea reefs show they might benefit from future regime shift. Science of The Total Environment, 141628. doi:10.1016/j.scitotenv.2020.141628
    Sponsors
    We gratefully acknowledge Miguel Viegas, João Curdia and Rodrigo Villalobos who aided us with laboratory and fieldwork and KAUST Coastal and Marine Resources Core Lab (CMOR) for their diligent fieldwork assistance. Funding: This project was supported by King Abdullah University of Science and Technology (KAUST) through the baseline research funding provided to X.A.G. Morán, S. Carvalho was financially supported by Saudi Aramco / KAUST Center for Marine Environmental Observations. This research was undertaken in accordance with the policies and procedures of KAUST. Permissions relevant for KAUST to undertake the research have been obtained from the applicable governmental agencies in the Kingdom of Saudi Arabia.
    Publisher
    Elsevier BV
    Journal
    Science of The Total Environment
    DOI
    10.1016/j.scitotenv.2020.141628
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0048969720351573
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.scitotenv.2020.141628
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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