Preprint volume - SIBM

Pre-print Volume – Oral presentations
Topic 3: INTEGRATED COASTAL ZONE MANAGEMENT
Analytic Laboratories. Radiocarbon dates were calibrated and corrected for the marine
reservoir effect. All dates reported are expressed in years Before Present (BP). The
monetary value has been assessed using emergy analysis (Odum, 1996). This
methodology allows to quantify resources keeping a system or an eco-function. To
evaluate the economic value of P. oceanica different functions have been considered:
oxygen release, primary production, nursery role.
Results - Cartography obtained from indirect and direct surveys between Bergeggi and
Vado Ligure (Diviacco and Coppo, 2006) allowed to obtain the extension and typology
of coverage of: P. oceanica, mosaic of P. oceanica and dead matte, dead matte. In
1990 have been recognized exclusively areas characterized by the presence of P.
oceanica, in 1991 the surveys allowed to map mosaic of P. oceanica and dead matte
and a small percentage of dead matte (Fig. 1; Tab. 1). Spatial analyses allowed to
assess that the three cartographies show extremely low percentages of concordance
(Tab. 2).
Fig. 1 - Study area, with the results of the vectorisation of the cartographies of 1990, 1991 and 2006.
Area di studio, con i risultati della vettorializzazione delle cartografie del 1990, 1991 e 2006.
Tab. 1 - Extension (ha) respectively of: Posidonia oceanica meadows, mosaic of P. oceanica and
dead matte, dead matte in the three years of reference.
Estensione (ettari) rispettivamente di: praterie di P. oceanica, mosaico e matte morta.
Year 1990 1991 2006
Posidonia oceanica 51,3 0,0 10,4
Mosaic of P. oceanica and dead matte 0,0 24,0 0,9
Dead matte 0,0 1,5 15,0
41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010
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