A new index (MediSkew) for the assessment of the Cymodocea nodosa (Ucria) Ascherson meadow's status

Marine Environmental Research
Martina Orlando-BonacaAnnalisa Falace

Abstract

In the Mediterranean region Cymodocea nodosa is widely distributed throughout shallow sites. Therefore, a correct assessment of the status of its meadows is of great importance for the implementation of the Water Framework Directive (WFD), the Marine Strategy Framework Directive (MSFD), and the Habitat Directive (HD), especially for areas where Posidonia oceanica meadows (the most frequently used indicator in the Mediterranean Sea) are rare or not present. The previously proposed index for the evaluation of the status of C. nodosa meadows (CymoSkew) is based on ln-transformed relative frequencies of photosynthetic leaf lengths, which we believe is statistically questionable. Therefore, we further improved the methodology and developed a new index named MediSkew, where ln-transformation is applied to raw data of leaf lengths. More specifically, the index 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. To develop the classification criteria for the assessment of the status, also a Pressure Index for Seagrass Meadows (PISM), for the evaluation of pr...Continue Reading

References

Sep 2, 2000·Journal of Experimental Marine Biology and Ecology·B W Touchette, J M Burkholder
Dec 5, 2008·Journal of Environmental Management·Cecilia Lopez y RoyoGianna Casazza
Jul 10, 2009·Proceedings of the National Academy of Sciences of the United States of America·Michelle WaycottSusan L Williams
Apr 13, 2010·Journal of Environmental Monitoring : JEM·Begoña Martínez-CregoJavier Romero

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Citations

Feb 13, 2019·Environmental Science and Pollution Research International·Rym Zakhama-SraiebFaouzia Charfi-Cheikhrouha
Mar 27, 2018·The Science of the Total Environment·Giuseppe Bonanno, Salvatore Antonino Raccuia
Oct 9, 2021·Environmental Science and Pollution Research International·Mohammed Othman Aljahdali, Abdullahi Bala Alhassan

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