Metodologie di ripristino di praterie di Posidonia oceanica

This thesis evaluates the effectiveness of Posidonia oceanica transplantation using the patented R.E.C.S.-Cocco system (Reinforced Erosion Control System) on dead matte, analysing establishment success and shoot density dynamics over different temporal scales. A qualitative and quantitative comparison with alternative techniques (coconut-fibre biomats and stakes) is also conducted to highlight biological and operational differences. Posidonia oceanica, an endemic Mediterranean seagrass, plays a key ecological role: its meadows show high primary productivity, contribute to coastal protection by attenuating wave energy, and represent important biodiversity hotspots. Since the 1950s, however, these meadows have experienced significant regression mainly due to anthropogenic pressures, making transplantation an important ecological restoration tool. The study was carried out along the coasts of Elba Island (Cavo, LI) on transplantations performed in 2019, 2023 and 2025. For each year, ten biomats were installed and divided into 1 m² patches, each containing 240 cuttings. Monitoring included measurements of shoot density at the initial time (T0) and at subsequent intervals (T1, T2, T3). For the 2019 transplantation, a long-term analysis was conducted over 2315 days. Differences between years, time intervals and materials were analysed using one-way ANOVA (α = 0.05). During the first 123 days, all transplantations showed a decrease in shoot density, with no significant differences among years. Between T1-T2, density values stabilised. Long-term monitoring of the 2019 transplantation showed a significant increase in shoot density, indicating successful establishment. The comparison between materials (2025) revealed significant differences, with stakes showing better short-term performance than biomats. Overall, the results confirm transplantation as an effective restoration strategy and highlight the importance of long-term monitoring and appropriate anchoring materials.