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            <gco:CharacterString>Un inventaire des bancs de maerl, algues rouges marines Corallinacées à thalles calcifiés arbusculaires et non fixés, est réalisé dans les Pertuis Charentais grâce à la compilation de données historiques et de nouvelles observations sur la période 2006-2012. L’emprise géographique de l’inventaire englobe les Pertuis Breton, d’Antioche et de Maumusson, s’étend de l’estuaire du Lay au Nord à la baie de Marennes-Oléron au Sud et inclut les pourtours des îles de Ré, d’Oléron et d’Aix. Sont contributrices à cet inventaire, les prospections DCE 2006, les contrôles de surveillance DCE 2007 à 2012 sous l’égide d’Ifremer et des Agences de l’Eau Loire-Bretagne et Adour-Garonne, les prospections réalisées pour le Port Atlantique La Rochelle sur le site de dépôts de dragage du Lavardin de 2007 à 2012, les prospections 2007 FONSOLE d’Ifremer et les prospections d’Ifremer et du laboratoire LIENSs en vue de cartographier les stocks de crépidules en mer des Pertuis Charentais. S’ajoutent des prospections spécifiques réalisées en 2011 à bord du navire Estran par benne sur les fonds sédimentaires infralittoraux du Pertuis Breton et par cadrat en zone intertidale en 2012 sur les pourtours des îles de Ré, d’Oléron et le long des falaises d’Aytré. Le positionnement des stations de vérité terrain ont eu lieu par relevés GPS ou dGPS.
Repéré initialement par des prélèvements à la benne en octobre 2009 lors de la validation de prospections sonar pour individualiser les stocks de crépidules, un banc de maerl vif est cartographié en juillet 2011 en rade de Saint-Martin dans le Pertuis Breton. Sa superficie est estimée à plus de 2 km². Des prospections pedibus jambi réalisées à la pointe du Grouin et à Saint-Martin de Ré ont permis de confirmer la présence de maerl vif épars sur le bas des estrans. Cela suggère un éparpillement des thalles de maerl vif sur plusieurs dizaines de km² autour du banc principal de Saint-Martin. Est aussi confirmé l’unique relevé algologique de Phymatolithon calcareum fait au début du XXème siècle à Saint-Martin de Ré par Dollfus, probablement déjà en bas d’estran comme observé en 2012 à proximité de la balise du Couronneau. De très nombreux thalles de maerl mort en voie de diagénèse ont aussi été observés dans l’Est et le Sud-Est des Pertuis Breton et d’Antioche suggérant des apports par transports passifs issus de bancs vivants situés plus à l’Ouest, y compris dans le Pertuis d’Antioche. La présence de maerl vif sur le bas des estrans est en effet connue très ponctuellement dans l’Ouest des îles d’Oléron (Pointe de Chassiron) et de Ré (Phare des Baleines) via des relevés algologiques et faunistiques récents.
Sur le plan biogéographique, le banc de maerl du Pertuis Breton est le plus oriental et le plus méridional de ceux connus dans le Golfe de Gascogne. Les bancs de maerl connus les plus proches sont respectivement situés à Noirmoutier (baie de Bourgneuf) et en Galice (Espagne). Ces observations complètent l’atlas cartographique des populations de maerl en Europe édité sous l’égide de la convention OSPAR. Elles apportent une base de connaissances pour les futures actions de conservation à définir localement dans le contexte Natura 2000 en mer du Parc Naturel Marin de l’estuaire de la Gironde et des Pertuis charentais.</gco:CharacterString>
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LIttoral ENvironnement et Sociétés - La Rochelle Université / CNRS : Pierre-Guy Sauriau &amp; Cécile Curti, numérisation et validation scientifique</gco:CharacterString>
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                        <gmd:LocalisedCharacterString locale="#EN">Required citation for the bibliography: Sauriau P.-G., Curti C., Jourde J., Aubert F., Cajeri P., Lavesque N., Dubois S., Lepareur F., Gouesbier C., Sauriau F., Sauriau M., Latry L., Robert S., Leguay D., Pineau D. &amp; Geairon P. (2012). Le maerl algues corallinacées marines dans les Pertuis Charentais. Annales de la Société des Sciences Naturelles de la Charente-Maritime, 10: 281-300.</gmd:LocalisedCharacterString>
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