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Bioerosion of the coralline alga Hydrolithon onkodes by microborers in the coral reefs of Moorea, French Polynesia ArchiMer
Tribollet, A; Payri, C.
Calcareous skeletons of the coralline alga Hydrolithon onkodes are colonised by a variety of microboring organisms including euendolithic algae. The species composition of microboring organisms as well as the boring patterns and the boring activity differ between live and dead coralline crusts. The microborers inhabiting the live crusts form an obvious, macroscopically visible green layer in the basal part of the crust, which is in contact with the substratum underneath. Some species, primarily Plectonema terebrans (83 %) and Ostreobium quekettii (7 %) grow from the inside towards the crust's surface and produce a dense network of branched filaments. Following the death of the coralline alga, the skeletons are colonised at the surface and bored inward by...
Tipo: Text Palavras-chave: Bioérosion; Récifs coralliens; Algues corallinacées; Endolithes; Polynésie française; Bioerosion; Coral reefs; Coralline algae; Endoliths; French Polynesia.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43346/42880.pdf
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Caractérisation des fonds marins et estimation bathymétrique par inversion de modèle de transfert radiatif : Application à l'imagerie hyperspectrale en milieu corallien ArchiMer
Petit, Tristan.
Airborne hyperspectral imaging is a potential candidate for mapping and monitoring coral reefs at large scale and with high spatial resolution. In this thesis, we first present the processing steps to be applied to hyperspectral signals for extracting information about seabed types, bathymetry and water optical properties, and we discuss their efficiency with respect to two main confounding factors: (i) low signal to noise ratio of the measured signals, and (ii) large number and variability of physical interactions occurring between the entrance of sunlight into the atmosphere and its measurement by the hyperspectral sensor. Considering these limitations, we examine the performance of an already existing water column processing method: semi-analytical...
Tipo: Text Palavras-chave: Récifs coralliens; Bathymétrie; Cartographie des habitats benthiques; Hyperspectral; Modèle de transfert radiatif; Inversion par optimisation; Analyse de sensibilité; Coral reefs; Bathymetry; Seabed type mapping; Hyperspectral; Radiative transfer model; Inversion by optimization; Sensitivity analysis.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00400/51135/51905.pdf
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Distribution spatiale des stocks de poissons récifaux démersaux d'intérêt commercial et effort de pêche en Province Nord de Nouvelle-Calédonie (Pacifique occidental) ArchiMer
Letourneur, Yves; Labrosse, Pierre; Kulbicki, Michel.
Fish from lagoon and reef in New Caledonia are mainly caught by artisanal fisheries and subsistence fishing. The present study aimed at estimating these fish standing stocks, at finding the main factors influencing the spatial distribution of these fish, and at estimating the maximum sustainable yield with considerations for socio-economic aspects sensu late. A total of 1406 stations was surveyed in the Northern Province of New Caledonia. Sampling was stratified according to three zones (north, east and west) and three biotopes (coral reefs, near-reef areas and lagoon bottoms). This work demonstrates the existence of important fish stocks of commercial interest in reefal and lagoonal waters of the Northern Province, estimated at about 138 300 t. The...
Tipo: Text Palavras-chave: Ichtyofaune démersale; Récifs coralliens; Fonds de lagon; Pêche artisanale; Stocks; Demersal ichthyofauna; Coral reefs; Lagoon bottoms; Artisanal fishing; Standing stocks.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43383/42827.pdf
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Fiches Techniques. BD Récif. Mode d'emploi sous forme de fiches synthétiques permettant de faciliter l'utilisation de BD Récif de la saisie à l'administration des données ArchiMer
Maurel, Laurence; Bocande, Stephane; Duval, Magali; Gauthier, Emilie; Huguet, Antoine.
Ces fiches ont été rédigées pour accompagner la mise en service de l'outil "BD Récif" et constitue la notice d'utilisation simplifiée. BD Récif est une application destinée à faciliter la bancarisation  des données relatives aux écosystèmes récifaux (suivis des aires marines protégées, suivis de la Directive Cadre sur l'eau, programmes de recherche, …). Cet outil a été financé par l'Etat / DEAL Réunion (inscrit dans le TIT Resobs de l'IFRECOR), le MNHN et IFREMER. Il a été mis en production en 2016 et livré avec des données historiques qui ont fait l'objet pour partie de reprises depuis l'outil CoReMo. Cet outil s'appuie sur le Système d'Information Quadrige² (constituant le système central, car désigné par le Ministère en charge de l'Environnement comme...
Tipo: Text Palavras-chave: BD Récif; Données; Métadonnées; Résultats; Saisie; Extraction; Administration; Base de données; Benthos de substrats durs; Récifs coralliens.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00386/49776/50321.pdf
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HYSCORES : Cartographies hyperspectrales appliquées aux écosystèmes coralliens et à leur état de santé. ArchiMer
Ropert, Michel; Mouquet, Pascal; Bajjouk, Touria; Delacourt, Christophe.
En 2013, les résultats des travaux menés dans le cadre des projets "Spectrhabent-OI" (2009-2012), étendus au projet "Bioindication" (2012-2013) ont permis d'illustrer le potentiel important représenté par les nouvelles techniques d'imagerie aérienne hyperspectrale appliquées sur les plateformes récifales de l'île de La Réunion. L'objectif principal du projet HYSCORES (2015-2016) est de consolider ces premiers résultats dans une perspective de mise en œuvre opérationnelle de ces nouvelles méthodes dans le cadre de la DCE (directive-cadre européenne sur l’eau (2000/60/CE)). Pour cela 3 axes de recherche sont proposés : 1) l’étude et l'évaluation de la pertinence de l'indicateur VCH (vitalité corallienne hyperspectrale) proposé en 2012 ; 2) la capacité de...
Tipo: Text Palavras-chave: Océan Indien; La Réunion; Récifs coralliens; Télédétection; Hyperspectral; Imagerie; Cartographie; Indicateur; Vitalité corallienne; Recouvrements; Algue; Corail; Sable; Herbier.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00350/46122/45820.pdf
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HYSCORES : Cartographies hyperspectrales appliquées aux écosystèmes coralliens et à leur état de santé. Rapport intermédiaire de fin de campagne d'acquisition ArchiMer
Mouquet, Pascal; Ropert, Michel; Bajjouk, Touria; Delacourt, Christophe.
En 2013, les résultats des travaux menés dans le cadre des projets "Spectrhabent-OI" (2009-2012), étendus au projet "Bioindication" (2012-2013) ont permis d'illustrer le potentiel important représenté par les nouvelles techniques d'imagerie aérienne hyperspectrale appliquées sur les plateformes récifales de l'île de La réunion. Au-delà de l'apport de l'hyperspectral dans une dimension descriptive, il a été montré que la combinaison d'indices de couverture algale et corallienne permettait d'envisager l’élaboration d’un indice surfacique d'état, adapté aux plateformes récifales, appelé "vitalité corallienne hyperspectrale" (VCH). L'objectif principal du projet HYSCORES (2015-2016) est de consolider ces premiers résultats tout en évaluant les possibilités de...
Tipo: Text Palavras-chave: Océan Indien; La Réunion; Récifs coralliens; Hyperspectral; Imagerie; Cartographie; Indicateur; Vitalité corallienne; Recouvrements; Algues; Corail; Sable; Herbiers.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00320/43144/42694.pdf
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Internal bioerosion of Acropora formosa in Reunion (Indian Ocean): microborer and macroborer activities ArchiMer
Zubia, M; Peyrot-clausade, M.
Bioerosion by grazing and boring organisms is one of the major destructive forces operating on reef. The aim of this study was to estimate the intensity of internal bioerosion by both microflora and fauna of Acropora, a branching scleractinian, on the reef flat at La Saline (Reunion, Indian Ocean). Internal bioerosion was estimated at two sites, varying in degrees of eutrophication. At each site, dead Acropora subjected to heavy grazing or covered by algal turf were examined. Acropora formosa is subjected to high bioerosion due to its high porosity and its branching form, which facilitates colonisation by boring organisms. Three endolithic microflora species, Plectonema terebrans, Mastigocoleus testarum and Ostreobium queckettii colonised the branches. The...
Tipo: Text Palavras-chave: Acropora; Bioérosion; Organismes perforants; Récifs coralliens; Océan Indien; Acropora; Bioerosion; Boring organisms; Coral reef; Indian Ocean.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43353/42860.pdf
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Photoacclimatization in the zooxanthellae of Pocillopora verrucosa and comparison with a pelagic algal community ArchiMer
Maritorena, S; Payri, C; Babin, M; Claustre, H; Bonnafous, L; Morel, A; Rodiere, M.
Photoacclimatization of zooxanthellae extracted from the coral Pocillopora verrucoso was studied through the determination of pigments, light absorption and photosynthetic parameters. for samples collected in summer and winter between 1 and 40 m on a northwestern reef of Tahiti (French Polynesia). The same measurements were also performed on phytoplanktonic samples collected at a stable oceanic site north of the island. For the zooxanthellae, the variations with depth of all the parameters were generally of small amplitude. Seasonal differences were also observed. The photosynthetic to non-photosynthetic pigments ratio was higher at depth in both seasons and was higher in winter. The intracellular concentration of chlorophyll a and photosynthetic pigments...
Tipo: Text Palavras-chave: Zooxanthelles; Photoacclimatation; Pocillopora verrucosa; Phytoplancton; Récifs coralliens; Zooxanthellae; Photoacclimatization; Pocillopora verrucosa; Phytoplankton; Coral reefs.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43313/42941.pdf
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Quelques aspects bioécologiques de Gamberdiscus toxicus, peridinien benthique responsable de la ciguareta à Tahiti ArchiMer
Bagnis, R.; Inoue, A.; Rongeras, S.; Galonnier, M.; Bennett, J.; Chanteau, S.; Pastural, J..
We have carried out on a fringing reef of Tahiti, catching periodically ciguateric fishes, a comparative dynamic survey of the population density of GAMBERDISCUS TOXICUS and some linked environmental factors, during a four year period. Half of the marine parameters, i.e. temperature, salinity, dissolved NO2, NO3, PO34, SiO2, have been systematically studied according to a weekly or a monthly rhythm ; the other parameters, i.e. pH, dissolved NH3, 02, C and B12 vitamin have been studied episodically. The local pluviometry for the two weeks preceeding the samplings has also been measured. The statis­tical analysis of the data did not allow us to observe any significant simple correlation between the physical or chemical parameters and the density of G,...
Tipo: Text Palavras-chave: Toxines naturelles; Ciguatera; Peridiniens; Récifs coralliens.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00306/41755/40966.pdf
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Un bilan de la télédétection appliquée aux milieux coralliens ArchiMer
Andrefouet, Serge; Maritorena, Stéphane; Loubersac, Lionel.
The aim of this paper is to present in a practical fashion the status of the use of remote sensing for the study of coral reef environments through the analysis of work published in the years 1980-2000. We review the scales of the potential work and of that actually conducted, the principal applications and their limiting factors. We detail these limitations which are of a technological nature (spatial and spectral resolution of sensors), as well as often of a conceptual (role of remote sensing in the study) or methodological (image processing) nature. The understanding of these limitations, in relation to the reality of the field, allows identification of work which could be undertaken in the years 2000.
Tipo: Text Palavras-chave: Télédétection; Récifs coralliens; Cartographie; Bathymétrie; Classification; Segmentation; Remote sensing; Coral reefs; Mapping; Bathymetry; Classification; Segmentation.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00089/20044/17685.pdf
Registros recuperados: 10
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