Abstract

Cold-water coral habitat mapping in submarine canyons of the bay of Biscay was realized by the deep sea laboratory of Ifremer. Data came from the EVHOE 2012 cruise in the framework of the CoralFish project and as part of an agreement between Ifremer and the Agence des Aires Marines Protégées. The method was based on image analyses. Images were acquired using the towed camera « SCAMPI » during the EVHOE 2012 cruise (from 18/10/2012 to 02/12/2012, chief scientists: Jean-Pierre LEAUTE and Michèle SALAUN). Observed habitats were defined according to the CoralFish typology (J.S. Davies, B. Guillaumont, F. Tempera, A. Vertino, L. Beuck, S.H. Ólafsdóttir, C.J. Smith, J.H. Fosså, I.M.J. van den Beld, A. Savini, A. Rengstorf, C. Bayle, J.-F. Bourillet, S. Arnaud-Haond, A. Grehan, 2017. A new classification scheme of European cold-water coral habitats: Implications for ecosystem-based management of the deep sea, In Deep Sea Research Part II: Topical Studies in Oceanography, Volume 145, 2017, Pages 102-109, ISSN 0967-0645, https://doi.org/10.1016/j.dsr2.2017.04.014).

Cold-water coral habitat mapping in submarine canyons of the bay of Biscay was realized by the deep sea laboratory of Ifremer. Data came from the BOBGEO2 cruise in the framework of the CoralFish project and as part of an agreement between Ifremer and the Agence des Aires Marines Protégées. The method was based on image analyses. Images were acquired using the towed camera « SCAMPI » during the BOBGEO2 cruise (from 18/07/2010 to 25/07/2010, chief scientist: Jean-François BOURILLET, Ifremer Brest). Observed habitats were defined according to the CoralFish typology (J.S. Davies, B. Guillaumont, F. Tempera, A. Vertino, L. Beuck, S.H. Ólafsdóttir, C.J. Smith, J.H. Fosså, I.M.J. van den Beld, A. Savini, A. Rengstorf, C. Bayle, J.-F. Bourillet, S. Arnaud-Haond, A. Grehan, 2017. A new classification scheme of European cold-water coral habitats: Implications for ecosystem-based management of the deep sea, In Deep Sea Research Part II: Topical Studies in Oceanography, Volume 145, 2017, Pages 102-109, ISSN 0967-0645, https://doi.org/10.1016/j.dsr2.2017.04.014).

Habitat typology obtained from the statistical analysis of underwater video data collected from the STAVIRO autonomous unbaited video technique (AMBIO project)

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In the Mediterranean deep-sea two scleractinian species, Lophelia pertusa (= Desmophyllum pertusum) and Madrepora oculata, make up the dominant structure-forming corals. The Lacaze-Duthiers canyon is the only French Mediterranean canyon where the two species L. pertusa and M. oculata have been observed living together in large quantities, the situation generally described for the biocoenosis of cold-water corals (CWC). In this canyon large colonies (more than 40 cm) of both species of scleractinians were observed at depths ranging from 246 m to 541 m at the head of the canyon and its western flank. The second canyon is the Cassidaigne canyon, where M. oculata seems to be the only structure-forming scleractinian there. The largest concentration of M. oculata colonies was observed on the west flank of the canyon along a crest at depths ranging from 200 to 210 m. Mature M. oculata colonies attained heights up to 40 cm. M. oculata were observed in three other canyons: Bourcart, Sicié and Var. In the Bourcart canyon, M. oculata was observed on a shelf of hard substratum at 331 m depth. Several single branches protruded from a slab. In the Sicié canyon a 15-cm colony of M. oculata was observed at 255 m depth, while in the Var canyon, three young branches 2 cm long were seen growing at 350 m depth on a wall of hard rock. Data linked to the publication Fabri et al, 2014. https://doi.org/10.1016/j.dsr2.2013.06.016.

Cold-water coral habitat mapping in submarine canyons of the bay of Biscay was realized by the deep sea laboratory of Ifremer. Data came from the EVHOE 2009 cruise in the framework of the CoralFish project and as part of an agreement between Ifremer and the Agence des Aires Marines Protégées. The method was based on image analyses. Images were acquired using the towed camera « SCAMPI » during the EVHOE 2009 cruise (from 18/10/2009 to 01/12/2009, chief scientists: Jean-Pierre LEAUTE and Michèle SALAUN). Observed habitats were defined according to the CoralFish typology (J.S. Davies, B. Guillaumont, F. Tempera, A. Vertino, L. Beuck, S.H. Ólafsdóttir, C.J. Smith, J.H. Fosså, I.M.J. van den Beld, A. Savini, A. Rengstorf, C. Bayle, J.-F. Bourillet, S. Arnaud-Haond, A. Grehan, 2017. A new classification scheme of European cold-water coral habitats: Implications for ecosystem-based management of the deep sea, In Deep Sea Research Part II: Topical Studies in Oceanography, Volume 145, 2017, Pages 102-109, ISSN 0967-0645, https://doi.org/10.1016/j.dsr2.2017.04.014).

Projets de canalisations et d'ouvrages des réseaux d'Eau potable et d'Assainissement.

route_dist_alti_100m_1978 renseigne sur l'altitude et la distance au trait de côte des routes dans une bande de 100m de large sur les 4 communes d'étude en 1978 : Saint-Denis, Le Port, Saint-Paul et Saint-Pierre. Pour chaque tronçon est ensuite défini un degré d'exposition, en fonction de l'altitude, de la distance au trait de côte.

ZT_2011 représente les zones tampons ou zones d'amortissement des aléas météo-marins, à partir de la représentation de leurs deux composantes principales, la Zone Active (ZA) et la Zone Stabilisée (ZS). Cette donnée concerne 2011 et les 4 quatre communes d'étude de la Réunion : Saint-Denis, Le Port, Saint-Paul et Saint-Pierre.