In the Mediterranean Sea, Posidonia oceanica is the most important endemic seagrass species where it forms extensive meadows down to depths of 45 m (González-Correa et al. 2005, Kendrick et al. 2005).
Seagrass habitats are one of the most valuable marine habitats providing many benefits and services such as food and raw material, coastal protection, oxygen, feeding and shelter for commercially important and protected marine species, tourism and recreation services. This ecosystem also provides services essential for climate change adaptation and mitigation including sequestration and storage of carbon from the atmosphere and the ocean.
Despite their value, seagrass beds are declining at alarming rates between 5% and 20% in the Mediterranean Sea each year (Boudouresque et al. 2009) due to human activities like certain commercial fishing practises, aquaculture, coastal development and anchoring. P. oceanica It is a slow-growing seagrass species with low sexual reproduction, and these features make recovery from disturbance slow, hence its restoration is considered of paramount importance. Transplantation of seagrasses is a valid option to support the restoration of degraded habitats and offset the loss of valuable ecosystem services and carbon storage.
The seagrass parts like leaves, roots etc. that are washed ashore by storms, tides and winds form extensive wrack zones that are usually removed by the municipalities in coastal areas before the beginning of the tourist season. The beach wrack results in large amounts of organic material that can be further processed to produce renewable resources like for example, among others, organic fertiliser, biogas and construction material.