The impact of dredge-fill on Posidonia oceanica seagrass meadows: Regression and patterns of recovery
2011
Badalamenti, Fabio | Alagna, Adriana | D’Anna, Giovanni | Terlizzi, Antonio | Di Carlo, Giuseppe
Posidonia oceanica meadows can be severely damaged by dredge-fill operations. We report on the construction of gas pipelines that occurred between 1981 and 1993 in SW Sicily, Italy. A large portion of the meadow was mechanically removed, and the excavated trench was filled with a mosaic of substrates, ranging from sand to consolidated rock debris. Meadow loss and recovery were quantified over 7years after the end of operations. We recorded an overall loss of 81.20ha of meadow. Substrate strongly affected recovery as the percent cover by P. oceanica consistently increased on calcareous rubble, reaching values of 44.37±3.05% in shallow sites after 7years, whereas no significant increase occurred on other substrates. As in the Mediterranean Sea exploitation of coastal areas continues to grow with consequent impacts on P. oceanica meadows, this case study illustrates how artificial rubble-like materials could be employed to support the restoration of damaged meadows.
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