Posidonia oceanica seagrass plays vital role in Mediterranean ecosystem

Posidonia oceanica, a Mediterranean seagrass, is recognized as a critical component of the marine ecosystem, providing services comparable to tropical forests. These underwater meadows host approximately one-quarter of Mediterranean marine species, aid in climate change mitigation, protect coasts from erosion, and oxygenate water.

Scientific research indicates that these plants grow extremely slowly, with rhizomes extending only 1–2 centimeters per year, making the meadows a virtually non-renewable resource. Genetic studies have revealed the extraordinary longevity of these organisms; in areas around the Spanish islands of Ibiza and Formentera, identical genetic profiles found across distances of up to 15 kilometers suggest the existence of clonal lineages that may be between 80,000 and 200,000 years old.

Efforts are underway to restore degraded habitats. In Corsica, researchers have transplanted 6,500 cuttings over 1,200 square meters of seabed to combat damage caused by boat anchoring. These restoration projects aim to ensure the long-term ecological functions of the seagrass despite environmental pressures and rising sea levels.