Inventaire Des Coraux Scléractiniaires Du Grand Lagon Nord De La Nouvelle-Calédonie Campagne Coralcal-Iii 10-30 Mars 2009

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Inventaire Des Coraux Scléractiniaires Du Grand Lagon Nord De La Nouvelle-Calédonie Campagne Coralcal-Iii 10-30 Mars 2009 COMPOSANTE 3B - PROJET 3B4 Connaissance de la biodiversité en Nouvelle-Calédonie *90:7 Mars 2010 CAMPAGNE CORALCAL-III Coral Reef InitiativeS for the Pacific Initiatives Corail pour le Pacifique 10-30 MARS 2009 INVENTAIRE DES CORAUX SCLÉRACTINIAIRES DU GRAND LAGON NORD DE LA NOUVELLE-CALÉDONIE Auteur : Grégory Lasne Participants à la campagne : Claude Payri, Jean-Louis Menou, Alain Gerbault, Serge Andrefouët, John Butscher et Grégory Lasne Photo : Grégory LASNE La cellule de coordination du CRISP a été intégrée au Secrétariat de la Communauté du Pacifi que en 2008 afi n d’assurer une coordination et synergie maximales des actions touchant à la gestion des écosystèmes coralliens dans le Pacifi que. Le CRISP est un programme mis en œuvre dans le cadre de la politique développée par le Programme régional océanien de l’Environnement afi n de contribuer à la protection et la gestion durable des récifs coralliens des pays du Pacifi que. initiative pour la protection et la gestion des récifs coral- Cette approche se décline sur une série d’objectifs théma- L’ liens dans le Pacifi que (CRISP), portée par la France et pré- tiques qui sont : parée par l’AFD dans un cadre interministériel depuis 2002, a pour but de développer une vision pour l’avenir de ces mi- Objectif 1 : Meilleure connaissance de la biodiversité, de lieux uniques et des peuples qui en dépendent. Elle vise à l’état et du fonctionnement des écosystèmes coralliens. mettre en place des stratégies et des projets visant à préser- Objectif 2 : Réalisation d’opérations de protection et de ges- ver leur biodiversité et à développer dans le futur les services tion des écosystèmes coralliens à une échelle signifi cative. économiques et environnementaux qu’ils apportent tant au Objectif 3 : Valorisation du potentiel économique reposant niveau local que global. Elle est conçue, en outre, comme un sur les valeurs d’usage et la biodiversité des écosystèmes vecteur d’intégration entre états développés (Australie, Nou- coralliens. velle-Zélande, Japon, USA), collectivités françaises de l’outre- Objectif 4 : Diff usion de l’information et des savoirs ; ren- mer et pays en développement du Pacifi que. forcement des capacités et animation des réseaux locaux, nationaux et internationaux. Pour ce faire, l’initiative développe une approche spécifi que Le dispositif d’intervention du CRISP se structure en trois com- qui vise à : posantes majeures : – associer activités de réseau et projets de terrain ; Composante 1A : AMP et bassins versants – articuler recherche, aménagement et développement ; – 1A1 : Planifi cation de la conservation de la biodi- – combiner les apports de disciplines scientifi ques diverses, versité marine incluant la biologie, l’écologie, l’économie, la sociologie, le – 1A2 : Aires marines protégées (AMP) droit et les sciences humaines ; – 1A3 : Renforcement institutionnel et mise en réseau – intervenir sur l’ensemble des thèmes - terrestres et – 1A4 : Gestion intégrée des zones côtières récifales et marins - intéressant les récifs (y compris l’assainissement et la des bassins versants gestion des bassins versants) ; Composante 2 : Développement des écosystèmes coralliens – ne pas créer de structure nouvelle, mais apporter des – 2A : Connaissance, valorisation et gestion des écosys- ressources fi nancières à des partenaires déjà opérationnels tèmes coralliens et souhaitant développer leurs activités dans un esprit de – 2B : Restauration récifale coopération régionale. C’est la raison pour laquelle l’initiative – 2C : Valorisation des Substances actives marines (SAM) a été préparée sur la base d’un appel à propositions auprès de – 2D : Mise en place d’une base de données régionale l’ensemble des institutions et réseaux. (ReefBase Pacifi que) Composante 3 : Coordination et valorisation du programme – 3A : Capitalisation, valorisation et vulgarisation des Cellule de Coordination CRISP (CCU) acquis du programme CRISP Chef de programme Éric CLUA – 3B : Coordination, promotion et développement du CPS - BP D5 98848 Nouméa Cedex Programme CRISP Nouvelle-Calédonie – 3C : Appui aux fi lières économiques alternatives et Tél./Fax : (687) 26 54 71 durables E-mail : [email protected] – 3D : Vulnérabilité des écosystèmes et des espèces www.crisponline.net – 3E : Cellule économique LE PROGRAMME CRISP EST FINANCÉ PAR LES ORGANISATIONS SUIVANTES : 2 Résumé : La mission CORALCAL-3 s’est déroulée dans le Grand Lagon Nord de Nouvelle-Calédonie du 10 au 30 mars 2009. Cette mission, dirigée par Claude Payri, avait pour objectifs principaux : 1) d’établir les inventaires les plus exhaustifs possible des algues et phanérogames marines et des coraux scléractiniaires du Grand Lagon Nord de Nouvelle-Calédonie pour lequel nous disposons de très peu de données. Ce travail permettra d’aborder les questions biogéographique à l’échelle de la Nouvelle-Calédonie mais aussi du Pacifique et d’enrichir les collections de références et la photothèque ; et 2) de caractériser et de cartographier les principaux habitats à partir d’images satellitaires afin d’établir pour chacun des types d’habitats les relations habitat/ biodiversité spécifique à partir des données récoltées sur 4 groupes biologiques majeurs de l’écosystème (algues, coraux, invertébrés majeurs et poissons). Cette campagne constitue la deuxième expédition consacrée aux coraux dans cette zone peu accessible et peu explorée. Elle vient compléter l’étude réalisée dans le cadre de l’ AER (octobre 2006) en étendant la prospection à un territoire incluant les zones récifales du récif Cook, du récif des Français et des récifs associés aux îles Belep. Une liste des communautés scléractiniaires a été établie pour toutes les stations d’étude réparties dans les différents complexes géomorphologiques de la zone du GLN. Cette liste a été réalisée à l’appui d’observations in situ et documentées par de nombreuses photographies et des prélèvements d’échantillons (G. Lasne assisté de J. Butscher). Tous les échantillons scléractiniaires ont également été photographiés in situ (©IRD/G. Lasne). Ce travail d’inventaire a ensuite été validé en mai 2009 par les spécialistes en taxonomie (M. Pichon, C. Wallace et F. Benzoni). A ce jour 401 espèces de scléractiniaires ont été recensées en Nouvelle-Calédonie. Les récifs coralliens du Grand Lagon Nord présentent une diversité en espèces remarquable avec 277 taxons observés dont 3 espèces de coraux ahermatypiques (Tubastrea micrantha, Tubastrea sp.1 et Dendrophyllia sp.), et 3 espèces d’Hydrozoa (Milleporidae). Cette campagne a permis d’enrichir la collection de 328 spécimens représentant 203 taxons. Parmi l’ensemble des spécimens prélevés, de nombreuses espèces se sont révélées particulièrement intéressantes et nouvelles pour le recensement corallien néo-calédonien. 13 espèces nouvelles pour la NC : Acropora anthocercis, A russelli, Astreopora incrustans , Ctenactis crassa, Cycloseris somervillei, Favites acuticollis, Lithophyllum undulatum, Montastrea salebrosa, Montipora altasepta, Montipora alveopora, Stylocoeniella nikei, Stylophora subseriata, Turbinaria bifrons. 11 espèces connues en NC mais sans spécimens dans la collection : Acropora digitifera, Acropora polystoma, Acropora subulata, Acropora sp1, Acropora sp2, Favites chinensis, Montipora hoffmeisteri, Montipora sp1, Montipora sp2, Porites lutea, Symphyllia wilsoni. 11 espèces dont 1 seul exemplaire était entreposé dans la collection: Acanthastrea hillae, Acropora valenciennesi, Diaseris distorta, Favites sp1., Heliofungia actiniformis, Herpolitha weberi, Isopora cuneata, Lobophyllia pachysepta, Montipora sp3, Stylocoeniella armata, Turbinaria patula. BIOCÉNOSE S.A.R.L - Convention de partenariat CRISP/IRD/0901-22 du 4/02/2009 1 Inventaire des coraux scléractiniaires du Grand Lagon Nord de Nouvelle-Calédonie Contexte : • L’IRD a initié dans le cadre de ses activités de recherche l’inventaire des coraux de Nouvelle-Calédonie. Les premières collections ont été réalisées avant 2005 par les plongeurs de l’IRD et de manière opportune au cours de divers programmes de recherche. • Dans le contexte du dossier d’inscription au patrimoine mondial du bien en série calédonien, la CCU a apporté une aide financière à partir de 2005 pour des actions allant dans le sens d’une meilleure connaissance de la diversité spécifique des coraux scléractiniaires de Nouvelle-Calédonie. Cet appui a permis en collaboration avec l’IRD de Nouméa, de réaliser d’une part l’étude taxonomique de la collection de coraux (2684 spécimens) réalisée et entreposée à l’IRD et la publication d’une première liste taxonomique (Pichon, 2006) et d’autre part la synthèse sur l’état des connaissances de ce groupe biologique majeurs de l’écosystème corallien (Lasne 2007). • L’IRD de Nouméa est dépositaire d’une collection de référence de coraux scléractiniaires qui constitue le patrimoine scientifique principal concernant la connaissance de ce groupe biologique et poursuit un travail de récolte et d’inventaire, notamment à travers ses missions scientifiques dans la ZEE calédonienne • L’avis favorable donné par le comité IFRECOR de Nouvelle-Calédonie, en charge de la coordination des actions de gestion des récifs coralliens sur le territoire, lors de sa réunion du 21 octobre 2008 pour « que le CRISP poursuive l’appui financier à cet effort d’inventaire sur une composante majeure du bien inscrit au patrimoine de l’Unesco » et ce, en partenariat avec l’IRD en charge du programme scientifique et qui apporte pour sa part des moyens humains et logistiques. Pour cette campagne CORALCAL-3 (du 10 au 30 mars 2009),
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