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    Reconstruction of centennial-scale fluxes of chemical elements in the Australian coastal environment using seagrass archives

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    Type
    Article
    Authors
    Serrano, Oscar cc
    Davis, Grace
    Lavery, Paul S.
    Duarte, Carlos M. cc
    Martinez-Cortizas, Antonio
    Mateo, Miguel Angel
    Masqué, Pere cc
    Arias-Ortiz, Ariane cc
    Rozaimi, Mohammad
    Kendrick, Gary A.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2015-10-02
    Online Publication Date
    2015-10-02
    Print Publication Date
    2016-01
    Permanent link to this record
    http://hdl.handle.net/10754/622330
    
    Metadata
    Show full item record
    Abstract
    The study of a Posidonia australis sedimentary archive has provided a record of changes in element concentrations (Al, Fe, Mn, Pb, Zn, Cr, Cd, Co, As, Cu, Ni and S) over the last 3000 years in the Australian marine environment. Human-derived contamination in Oyster Harbor (SW Australia) started ~. 100 years ago (AD ~. 1900) and exponentially increased until present. This appears to be related to European colonization of Australia and the subsequent impact of human activities, namely mining, coal and metal production, and extensive agriculture. Two contamination periods of different magnitude have been identified: Expansion period (EXP, AD ~. 1900-1970) and Establishment period (EST, AD ~. 1970 to present). Enrichments of chemical elements with respect to baseline concentrations (in samples older than ~. 115 cal. years BP) were found for all elements studied in both periods, except for Ni, As and S. The highest enrichment factors were obtained for the EST period (ranging from 1.3-fold increase in Cu to 7.2-fold in Zn concentrations) compared to the EXP period (1.1-fold increase for Cu and Cr to 2.4-fold increase for Pb). Zinc, Pb, Mn and Co concentrations during both periods were 2- to 7-fold higher than baseline levels. This study demonstrates the value of Posidonia mats as long-term archives of element concentrations and trends in coastal ecosystems. We also provide preliminary evidence on the potential for Posidonia meadows to act as significant long-term biogeochemical sinks of chemical elements.
    Citation
    Serrano O, Davis G, Lavery PS, Duarte CM, Martinez-Cortizas A, et al. (2016) Reconstruction of centennial-scale fluxes of chemical elements in the Australian coastal environment using seagrass archives. Science of The Total Environment 541: 883–894. Available: http://dx.doi.org/10.1016/j.scitotenv.2015.09.017.
    Sponsors
    This work was supported by the ECU Faculty Research Grant Scheme, the ECU Early Career Research Grant Scheme, and the CSIRO Flagship Marine & Coastal Carbon Biogeochemical Cluster with funding from the CSIRO Flagship Collaboration Fund. PM was supported by a Gledden Visiting Fellowship and AAO by Obra Social "la Caixa". The authors are grateful to N. MarbA, G. Bastyan and D. Kyrwood for their help in field and/or laboratory tasks, as well as to L. Lopez-Merino and four anonymous reviewers for their comments.
    Publisher
    Elsevier BV
    Journal
    Science of The Total Environment
    DOI
    10.1016/j.scitotenv.2015.09.017
    PubMed ID
    26437357
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.scitotenv.2015.09.017
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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