Geolocations of Scopoli's shearwater (Calonectris diomedea) breeding colonies in the Mediterranean Sea. Distance sampling surveys are extensively used to estimate the abundance of wide-ranging species but are prone to detection biases. This may be particularly acute for strip-transect protocols, which assume perfect detection. We examined this assumption by quantifying the detection probability of a declining seabird (Scopoli’s shearwater, Calonectris diomedea), with particular attention to time-of-day and observation conditions at sea. We found detection probability was negatively affected by sun glare but positively by cloud cover and considerably dropped during mid-day hours due to circadian changes in behaviour (reduced detectability while resting). This result urges for systematically assessing and correcting detection bias when using strip-transect data to derive abundance information. Here, we did so by building a detection-corrected presence-absence ensemble model and combining it with a compilation of colony sizes and locations. A Monte-Carlo simulation ensured uncertainty propagation within and across data sources. The corrected abundance map showed shearwaters were largely prevalent in the central Mediterranean, Tunisia hosting most of the population both at sea and at colonies (45% of the global population; 79% of breeding pairs). This first accurate map is an essential conservation tool, emphasizing the importance of transnational actions for such species, that know no political boundaries.

This dataset contains, as polygon features, the areas covered by the bathymetric Digital Terrain Models (DTM), from value added transits of the French oceanographic fleet. The data acquisition is carried out in an opportunity mode during the ship's transit. Acoustic data are acquired by deep-sea multibeam echosounder (12kHz), in an opportunity mode, during the ship transits. All DTM have a 1 / 8 arcminute grid spacing, Transits are described by the DOI https://doi.org/10.18142/337, TV_TRANSIT_BATHY

Représentation des zones d'évaluation françaises, faisant parties des régions et sous-régions marines définies dans le cadre de la Directive cadre stratégie pour le milieu marin (DCSMM, Directive 2008/56/CE du 17 juin 2008). La DCSMM n'a pas pour objet de traiter des questions de frontières et de compétence des États membres. Les informations fournies permettent simplement de savoir où ces questions se posent, concernent un État membre, et de les afficher sur des cartes, dans le cadre de la mise en œuvre de la directive2008/56/CE. - version : avril 2013 ; - format de la donnée : 4 polygones ; - méthodologies de création : produit multi-source (SHOM, IGN, IFREMER, AAMP, Agences de l'eau) ; - ETRS89, GRS 80, LAEA 5210 (EPSG:3035)

Grading the quality of metropolitan coastal bathing waters in 2010 from the Department of Health. Data collected from the Ministry of Health as part of the initial assessment of the MSFD. Referent expert: Aurélie Blanck.

Représentation des eaux marines françaises, faisant parties des régions et sous-régions marines définies dans le cadre de la Directive cadre stratégie pour le milieu marin (DCSMM, Directive 2008/56/CE du 17 juin 2008). La DCSMM n'a pas pour objet de traiter des questions de frontières et de compétence des États membres. Les informations fournies permettent simplement de savoir où ces questions se posent, concernant un État membre, et de les afficher sur des cartes, dans le cadre de la mise en œuvre de la directive2008/56/CE. - version : avril 2013 ; - format de la donnée : 5 polygones ; - méthodologies de création : produit multi-source (SHOM, IGN, IFREMER, AAMP, Agences de l'eau) ; - ETRS89, GRS 80, LAEA 5210 (EPSG:3035)