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  • Asessment of the Cymodocea nodosa (Ucria) Ascherson meadowʼs status with the new MediSkew index
    Orlando-Bonaca, Martina ...
    In the Mediterranean Sea meadows of the the Lesser Neptune grass (Cymodocea nodosa (Ucria) Ascherson) are widely distributed throughout shallow sites. Therefore, the correct assessment of the status ... of such meadows is essential for the implementation of the Water Framework Direcitve (WFD), the Marine Strategy Framework Directive (MSFD), and the Habitat Directive (HD). The previously proposed index for the evaluation of the status of C. nodosa meadows (CymoSkew) was further improved, and a new index (MediSkew) was developed. The MediSkew is a combination of two metrics, both based on C. nodosa leaf length: deviation from the reference median length (Medi-) and skewness of the length frequency distribution (-Skew), though greater importance was assigned to the first. The combination of the two appropriately weighted metrics gave a more precise evaluation of the status of all C. nodosa meadows than using only one metric. To be compliant with WFD, reference conditions were defined for C. nodosa meadows and a Pressure Index for Seagrass Meadows (PISM) was developed for the evaluation of pressure-impact relationship. The status of C. nodosa meadows in the Gulf of Trieste (northern Adriatic) assessed with the MediSkew showed a good correlation with the sum of the main human-induced pressures evaluated using PISM. Within seven C. nodosa meadows only two sites did not achieve a Good Ecological/Environmental Status. The MediSkew and the PISM indices are proposed to be a rapid screening method for C. nodosa meadows, especially for areas where Posidonia oceanica meadows (the most frequently used indicator in the Mediterranean Sea) are rare or not present. The MediSkew index has a potential broad applicability in the context of three important European Directives, and its use is recommended in regular monitoring programmes.
    Vir: Abstract book [Elektronski vir] (Str. 170)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2017
    Jezik - angleški
    COBISS.SI-ID - 4447823

    Povezava(-e):

    http://www.embs52.org/programme/book-of-abstracts.html

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