More than 50 species of fishes (including many traded commercial species) live inside the Posidonia habitat. The role of nursery is highly important for many species. It is a refuge and breeding place for more than 400 plant species and 1,000 animal species.
Seagrasses are able to fix as much carbon as the forest (more than 5 t equivalent CO2 per ha per yr.) and 20 to 25 % is trapped in the meadow for thousands of years (major carbon sink).
Carbon stocks in the dead meadows are 10 times higher than the stock present in the forest soil
Every year, Posidonia seagrasses absorb for 0,6% of CO2 emissions of the Mediterranean countries, but this rate can be higher locally (Tunisia = 15-20 % ; Corsica = 14,4%).
The growth of the dead meadows is around 1 mm per year (1 m per century maximum). Once destroyed, it cannot be recovered.
- Boudouresque C. F., Bernard G., Bonhomme P., Charbonnel E., Diviacco G., Meinesz A., Pergent G., Pergent-Martini C., Ruitton S., Tunesi L., 2012. Protection and conservation of Posidonia oceanica meadows. RAMOGE and RAC/SPA publisher, Tunis: 1-202. https://www.rac-spa.org/sites/default/files/doc_vegetation/ramoge_en.pdf
- Díaz-Almela E. & Duarte C.M. 2008. Management of Natura 2000 habitats. 1120 *Posidonia beds (Posidonion oceanicae). European Commission. https://uicnmed.org/bibliotecavirtualposidonia/wp-content/uploads/2014/04/MANAGEMENT-of-Natura-2000-habitats-Posidonia-beds.pdf
- Telesca, L. et al. Seagrass meadows (Posidonia oceanica) distribution and trajectories of change. Sci. Rep. 5, 12505; doi: 10.1038/srep12505 (2015).