Littérature scientifique sur le sujet « Plancton marin – Populations »
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Articles de revues sur le sujet "Plancton marin – Populations"
Kamal, Maud, Kimya Rahmani Narj Abadi, Raphaël Sanchez, Célia Dupain, Isabelle Guillou, Grégoire Marret, Zahra Castel Ajgal et al. « Abstract B005 : Impact of molecular profiling and ESCAT classification on patient outcome : The experience of Institut Curie Molecular Tumor Board ». Molecular Cancer Therapeutics 22, no 12_Supplement (1 décembre 2023) : B005. http://dx.doi.org/10.1158/1535-7163.targ-23-b005.
Texte intégralThèses sur le sujet "Plancton marin – Populations"
Da, Silva Ophélie. « Structure de l'écosystème planctonique : apport des données à haut débit de séquençage et d'imagerie ». Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS183.
Texte intégralPlanktonic organisms are key actors in oceanic ecosystems, which support trophic networks and play a major role in biogeochemical cycles and climate regulation. While the spatio-temporal distribution of planktonic diversity can be investigated at several levels, from the gene to the ecosystem, identifying the underlying mechanisms is challenging. Indeed, the structure of diversity results from different evolutionary and ecological processes that can act simultaneously. Since the beginning of the 21st century, the oceanic environment has been increasingly monitored. Numerous observation platforms have been deployed, leading to the acquisition of a large amount of data for multiple environmental characteristics. At the same time, technologies for studying living organisms have been developed. Thus, an unprecedented sampling of planktonic organisms has taken place. In particular, high-throughput sequencing and imaging data provide molecular, taxonomic and functional information at several biological levels. The objective of this thesis was to explore the structure of planktonic ecosystems using high-throughput sequencing and imaging data. Coupling with environmental data could contribute to a better understanding of the spatial distribution of planktonic diversity, from species to communities. In the first part, the genetic diversity of protists was studied at the species level. The hypothesis was that metagenomics could provide access to the poorly characterized spatial organization of the intraspecific protist genetic diversity, as well as to the mechanisms underlying it. In a second part, the link between genetic diversity and functional diversity was explored. Transparency was targeted. This functional trait is little explored at the community level and its molecular basis is poorly identified. A data-driven approach allowed this trait to emerge from imaging data, leading to the exploration of its biogeography and molecular basis. In the last part, the high potential of complementarity between sequencing, imaging and environmental datasets was explored, in order to highlight the multi-scale structure of the planktonic ecosystem and to identify its global structure. Finally, all the results were discussed to highlight the contributions that these data can provide to the understanding of planktonic ecosystems, as well as the limitations they can face
Chabert, Pierre. « Impact of Synoptic Wind Variability on the Dynamics and Planktonic Ecosystem of the South Senegalese Upwelling Sector ». Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS096.
Texte intégralIn addition to the wind seasonal cycle, Eastern Boundary Upwelling Systems undergo fluctuations at shorter synoptic to intraseasonal time scales. This thesis focuses on the impact of synoptic wind intensifications and relaxations with a period of 5-10 days on the dynamics and planktonic ecosystem of the South Senegalese Upwelling Sector (SSUS). This system is located south of the sharp Cape Verde peninsula which acts as an abrupt coastline break and has a particularly shallow continental shelf. We aim to bring additional knowledge on this important coastal upwelling system that has received little attention, especially at synoptic time scales. To investigate this, we develop a modeling framework that involves applying idealized synoptic wind intensification and relaxation to an ensemble of climatological SSUS states. Synoptic fluctuations impact all dynamical variables out of their intrinsic variability range and shape robust anomalies of SSUS-scale and mesoscale spatial patterns. Using a mixed layer heat bud- get over the shelf, we identify the importance of horizontal processes in the SSUS heat variability and the very localized importance of vertical processes. Plankton biomass are found to oscillate in space and time in response to synoptic wind fluctuations. The atmospheric perturbation is damped during its propagation towards the upper trophic levels of the ecosystem. The response of the planktonic ecosystem is complex and heterogeneous over the shelf, with a distinctive inner shelf behavior. A diatoms budget reveals that their biomass is primarily controlled by primary production, zooplankton grazing and mortality-aggregation. The balance between these processes is responsible for the oscillatory responses of the diatoms biomass to synoptic wind events. All dynamical and biogeochemical variables exhibit modest asymmetries between wind intensification and relaxation responses. This brings support to the hypothesis that synoptic variability has a modest net impact on the climatological mean state. The implications of our results for future research questions are discussed, including the importance of biogeochemical observations and advances in plankton ecosystem modeling
Sadhotomo, Bambang. « Bioécologie des principales espèces pélagiques exploitées en mer de Java ». Montpellier 2, 1998. http://www.theses.fr/1998MON20184.
Texte intégralSourisseau, Marc. « Étude de la structure de taille de la communauté des copépodes par l'analyse de spectres mesurés avec un compteur optique et par la modélisation de la dynamique des populations ». Paris 6, 2002. http://www.theses.fr/2002PA066342.
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