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| Dalloyau, Sebastien; Trut, Gilles; Plus, Martin; Auby, Isabelle; Emery, Eric. |
| Le suivi surfacique des herbiers de zostères du Bassin d'Arcachon (a été entrepris en 2007 (pour Zostera noltii) et 2008 (pour Zostera marina). Pour Zostera noltii, cette cartographie a été réalisée par photo-interprétation d’une mosaïque d’images de résolution 1 mètre. Ces clichés IGN, orthorectifiés et georéferencés ont été acquis en août et septembre 2007. Un important travail de validation terrain a permis d'attribuer des indices de fiabilité aux cartographies obtenues. Pour Zostera marina, la méthode a consisté à coupler une information de présence/absence déterminée par superposition de signaux issus d’un sonar latéral et d’un sondeur acoustique à des observations terrain obtenues par une caméra vidéo tractée sous marine reliée à un système de... |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00167/27833/26039.pdf |
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| Plus, Martin; Dalloyau, Sebastien; Trut, Gilles; Isabelle, Auby; De Montaudouin, Xavier; Emery, Eric; Claire, Noel; Christophe, Viala. |
| The spatial variability of seagrass meadows in Arcachon Bay, was studied between 1988 and 2008 using a combination of mapping techniques based on aerial photographs for intertidal dwarf-grass (Zostera noltti) beds and acoustic sonar for permanently submerged eelgrass (Zostera marina) populations. The results show a severe decline over the period for both species, as well as an acceleration of the decline since 2005 for Z. noltii. The total surface regression over the studied period is estimated to be 22.8 km(2) for Z. noltii and 2.7 km(2) for Z. marina, which represent declines of 33 and 74% respectively. Environmental data time series spanning the same period were investigated in order to seek the causes for such a decline. The calculated inter-annual... |
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Palavras-chave: Seagrass; Temporal evolution; Aerial photography; Acoustic sonar; Zostera noltii; Zostera marina; Arcachon Bay. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00003/11376/7969.pdf |
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| Pepin, Jean-francois; Emery, Eric. |
| During spring of 1993, an epizootic outbreak occurred in a sea bass farm, located on the French Mediterranean coast. The cumulative mortality reached 25%. First examination of cutaneous lesions revealed filamentous bundles of flexuous bacteria which exhibited gliding motility. Bacterial growth was obtained only from skin lesions. The biochemical characteristics of isolates are described. Pathogenicity tests of representative slrains were carried out. Until fuller data is available, the pathogen here reported was provisionally identified as a Cytophaga·like bacterium (CLB). |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00271/38252/36441.pdf |
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