Cartography of coralligenous habitats by profiles surveys

by Guillemain D., David R., De Ville d’Avray L. and Féral J.-P.
Thursday 24 April 2014
by  Romain DAVID
popularity : 14%

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The CIGESMED program, partly integrated into the MSFD (Marine Strategy Framework Directive) framework, is based on the study of endemic Mediterranean habitats: the so-called coralligenous. This milieu is mainly formed by sciaphilous coralline algae bioherm with complex structures. This bioherm enables the development of several types of communities where bio-constructor, bio-erodor ingeneer and “habitat?” species interact to build complex structures. The aim of this study is to identify main species assemblages according to various profiles (depth, orientation, slope, rugosity of the coralligenous wall and main stands), in order to improve the Good Ecological Statut (GES?.) for the MSFD Studied sites (small islands, shoal or coastlines) represent all orientations and the mapping is done at two depths (28 m and 43 m). Sampling is done along transects, divided into segments of 5 m long and is characterized by its profile?. This shared typology of cartography enables to contextualize data homogeneously in different European countries highlighting the preferential profiles of different coralline stands. This contextualization will be used to facilitate discovery of species in relation to different profiles. Moreover this will help to highlight unexpected presence or associations of species in relation to break of the GES as described in the MSFD.

References
Laborel, J. 1961. Le concretionnement algal « coralligène » et son importance géomorphologique en Mediterranée. Recueil des Travaux de la Station Marine d’Endoume 23: 37-60.
Laubier, L. 1966. Le Coralligène des Albères, monographie biocénotique. Annales de l’Institut Océeanographique de Monaco 43: 139-316.


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