Evolution des herbiers à Posidonia oceanica (L.) Delile dans la baie de Calvi (Corse, France) et influence de l’ancrage dans la baie de l’Alga

In the framework of the STARE-CAPMED program we studied the impact of human activities on Posidonia oceanica meadows in Calvi Bay (Corsica, France). We mostly focused on the consequences of boats anchoring in Alga Bay. The map of the marine habitats realized during this study shows that P. oceanica meadows cover a surface of 4.94 km2 in 2010 and have declined of 26 % since 1997. Advances in the data acquisition techniques allow a better identification of the habitats and a map reliability improvement. In several places in the bay, especially near the waste waters rejection site, the lower limit of the meadow is shallower than in the past. The diminution of the meadow surface in the 21-30 m bathymetric section is more important in the Alga site than in the rest of Calvi Bay. The ecological state of the water surrounding the meadow in Alga was assessed as "good" with a PREI index of 0.685. However, big units anchoring in this area lead to the creation of dead “mattes” whose compactness are medium. In this area, the generation of dead mattes seems to favor the settlement of the invasive Chlorobionta Caulerpa racemosa var. cylindracea, of which anchoring is known to be one of the introduction vectors.

Grantor dc:publisher

Université Aix-Marseille

Year dc:date

2012

Author dc:creator

• Abadie, Arnaud

• posidonia oceanica
• meadow
• seagrasses
• herbier
• ancrage
• calvi
• cartographie
• sig
• posidonie
• alga
• anchoring
• calvi bay
• mapping
• Life sciences
• Aquatic sciences & oceanology
• Sciences du vivant
• Sciences aquatiques & océanologie

Statement dc:rights

• open access
• info:eu-repo/semantics/openAccess

Licence

• http://purl.org/coar/access_right/c_abf2

Language dc:language

fr

Identifier

info:hdl:2268/167948

OAI identifier oai:identifier

oai:orbi.ulg.ac.be:2268/167948