 |
|
Theses
Cycle biologique et stratégies de développement chez les coccolithophores (Prymnesiophyceae, Haptophyta). Implications écologiques
Cycle biologique et stratégies de développement chez les coccolithophores (Prymnesiophyceae, Haptophyta). Implications écologiques
Abstract : Coccolithophores, one of the most important groups of marine phytoplankton, are calcified microalgae. Our knowledge of this group is nevertheless limited, due in part to the lack of cultured species. This study was focused on the life-cycle and its ecological implications for four species of coccolithophores in culture (Coccolithus pelagicus, Calcidiscus leptoporus, Coronosphaera mediterranea and Emiliania huxleyi). An heteromorphic haplo-diploid life-cycle was first demonstrated using various techniques. Ecophysiological experiments on abiotic factors (temperature, light, turbulence, nutrients) were then carried out showing the influence of the heteromorphic life-cycle on the ecology of these sepcies and an ecological cycle was established. Lastly, a preliminary study on toxicity was conducted, demonstrating the toxicity of five coastal coccolithophores.
https://tel.archives-ouvertes.fr/tel-00009000
Contributor : Aude Houdan <>
Submitted on : Tuesday, April 12, 2005 - 4:24:14 PM
Last modification on : Wednesday, April 24, 2019 - 1:04:18 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:34:15 PM
Contributor : Aude Houdan <>
Submitted on : Tuesday, April 12, 2005 - 4:24:14 PM
Last modification on : Wednesday, April 24, 2019 - 1:04:18 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:34:15 PM