|
|
|
|
|
| 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... |
| Tipo: Text |
|
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00167/27833/26039.pdf |
| |
|
|
| Auby, Isabelle; Bost, Charles-andré; Budzinski, Helene; Dalloyau, Sebastien; Desternes, Amandine; Belles, Angel; Trut, Gilles; Plus, Martin; Pere, Caroline; Couzi, Laurent; Feigne, Claude; Steinmetz, Julien. |
| While they had previously presented a hight stability, unlike in many coastal sites worldwide, eelgrass beds (Zostera noltii and Zostera marina) of Arcachon Bay have declined sharply since the 2000s. Various causes have been invoked to explain this phenomenon: climate anomalies, disease, over-grazing by herbivorous birds, contamination by herbicides, mechanical destruction during clam fishing. A multidisciplinary study was set up to study the possible effect of these factors, by putting into perspective the history of the seagrass beds and the temporal evolution of these parameters. After a chapter dealing with recent trends (2007-2010) of seagrasses in the Bay of Arcachon, the results relative to the various hypotheses are presented. These results allow... |
| Tipo: Text |
|
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00054/16507/14018.pdf |
| |
|
| |
|
| |
|
|
| 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... |
| Tipo: Text |
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 |
| |
|
|
| Auby, Isabelle; Sauriau, Pierre-guy; Oger-jeanneret, Helene; Hily, Christian; Dalloyau, Sebastien; Rollet, Claire; Trut, Gilles; Fortune, Mireille; Plus, Martin; Rigouin, Loic. |
| Tipo: Text |
|
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00186/29685/28059.pdf |
| |
|
|
|
