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    Aeolian transport of seagrass ( Posidonia oceanica ) beach-cast to terrestrial systems

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    Type
    Article
    Authors
    Jiménez, Maria A.
    Beltran, Rafel
    Traveset, Anna
    Calleja Cortes, Maria de Lluch
    Delgado-Huertas, Antonio cc
    Marbà, Núria
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Red Sea Research Center (RSRC)
    Date
    2017-06-29
    Online Publication Date
    2017-06-29
    Print Publication Date
    2017-09
    Permanent link to this record
    http://hdl.handle.net/10754/625650
    
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    Abstract
    The annual export of the Mediterranean seagrass (Posidonia oceanica) litter to adjacent beaches and coastal dunes was quantified by examining the fortnight evolution of seagrass beach-cast volume on two beaches in the NW Mediterranean (Son Real and Es Trenc, Mallorca Island, Spain) for two years and analyzing the wind speed and direction obtained from the closest Meteorological Spanish Agency surface weather stations. The decomposition stage of the deposits was examined by analyzing the total hydrolysable amino acids, its percentage distribution and derived degradation indexes. Prevalent winds exceeding 6 m s−1, the coastline morphology and type of terrestrial vegetation determine the annual dynamics of the seagrass beach-cast. In the most protected beach (Son Real) the seagrass beach-cast remained nearly stationary during the two studied years while it exhibited wide annual fluctuations in the less protected one (Es Trenc). The amounts of P. oceanica wrack washed on Son Real and Es Trenc beaches, respectively, were estimated at 309 kg DW m coastline−1 yr−1 and 1359 kg DW m coastline−1 yr−1. They supplied between 20 kg CaCO3 m coastline−1 yr−1 and 47 kg CaCO3 m coastline−1 yr−1. Between 54% (Son Real) and 70% (Es Trenc) of seagrass beach-cast, respectively accounting for 1.5 kg N m coastline−1 yr−1 and 8.6 kg N m coastline−1 yr−1, were annually exported from the beaches to adjacent dune systems. Our results reveal that Mediterranean seagrass meadows might be an important source of materials, including sand and nutrients, for adjacent terrestrial systems, able to support their functioning.
    Citation
    Jiménez MA, Beltran R, Traveset A, Calleja ML, Delgado-Huertas A, et al. (2017) Aeolian transport of seagrass ( Posidonia oceanica ) beach-cast to terrestrial systems. Estuarine, Coastal and Shelf Science 196: 31–44. Available: http://dx.doi.org/10.1016/j.ecss.2017.06.035.
    Sponsors
    This study was funded by the projects OPERA (EU, Project no: 308393, Collaborative Project of Theme ENV.2012.6.2–1), GAEM (Government of the Balearic Islands). The authors acknowledge C. Vignolo, J. C. Alonso, P. Beca, B. Nolla, A. Espases, M. Serra, J. Serra and T. Oliver for their support in the measurements of the dimensions of the seagrass beach-cast and J. Holding for language editing. Two anonymous reviewers provided valuable suggestions in a previous version of the manuscript. Meteorological data from the Spanish Meteorological Agency (AEMET) are taken from the HyMeX programme database. M. A. Jiménez and M. Ll. Calleja acknowledge financial support from the JAE-Doc program (CSIC, co-funded by FSE).
    Publisher
    Elsevier BV
    Journal
    Estuarine, Coastal and Shelf Science
    DOI
    10.1016/j.ecss.2017.06.035
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0272771416306084
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ecss.2017.06.035
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC)

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