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| Plus, Martin; Auby, Isabelle; Maurer, Daniele; Trut, Gilles; Del Amo, Y.; Dumas, Franck; Thouvenin, Benedicte. |
| This study presents an assessment of the contributions of various primary producers to the global annual production and N/P cycles of a coastal system, namely the Arcachon Bay, by means of a numerical model. This 3D model fully couples hydrodynamic with ecological processes and simulates nitrogen, silicon and phosphorus cycles as well as phytoplankton, macroalgae and seagrasses. Total annual production rates for the different components were calculated for different years (2005, 2007 and 2009) during a time period of drastic reduction in seagrass beds since 2005. The total demand of nitrogen and phosphorus was also calculated and discussed with regards to the riverine inputs. Moreover, this study presents the first estimation of particulate organic carbon... |
| Tipo: Text |
Palavras-chave: Primary production; Macrophyte; Phytoplankton; Biogeochemical cycle; Physical-ecological coupled model; Arcachon bay. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00278/38963/37503.pdf |
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| Binias, Cindy; Do, Van Tu; Jude-lemeilleur, Florence; Plus, Martin; Froidefond, Jean-marie; De Montaudouin, Xavier. |
| The aim of the present study was to identify environmental factors that could explain the distribution of different pathologies of commercially exploited intertidal bivalves in an Atlantic lagoon, Arcachon Bay. In particular, the role of the salinity gradient as a driver was explored. The Manila clam Ruditapes philippinarum experienced two severe pathologies, perkinsosis, which is due to a protozoan parasite, and brown muscle disease (BMD), the etiological agent of which remains unknown. Perkinsus olseni infection was very low in a small low-salinity area but, at the scale of the entire lagoon, was more influenced by organic matter content in the sediment and by emersion time. BMD prevalence was also 2.6 times higher in the higher organic content area but... |
| Tipo: Text |
Palavras-chave: Arcachon bay; Bivalves; Diseases; Distribution; Parasites. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00200/31083/31922.pdf |
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| Kermorvant, Claire; Caill-milly, Nathalie; Bru, Nooelle; D'Amico, Franck. |
| Funding lake is one major issue in ecology, in particular at local scale. It is known that sustainable management of a natural population requires a good understanding of its functioning, itself dependent on a good long term monitoring program. Such programs are usually very difficult to implement, especially for resources characterized by high spatio-temporal variation in their distribution, resulting in a trade off between efficiency and costs. Today, thanks to rapidly evolving statistical theory, new survey designs are developed, some with the characteristic of well balancing samples in the study area. This paper aims at demonstrating that theses advanced sampling designs perform better than the usual ones for long term monitoring program of local... |
| Tipo: Text |
Palavras-chave: Arcachon bay; Balanced acceptance sampling; Spatial sampling; Spatial variation; Temporal variation; Virtual ecology. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00469/58064/60460.pdf |
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