Добірка наукової літератури з теми "Déclin des herbiers"
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Статті в журналах з теми "Déclin des herbiers":
Hoff, Michel. "Herbier d’un élève de l’Institution Agricole de Vals-près-Le-Puy (Haute-Loire)." BIOM - Revue scientifique pour la biodiversité du Massif central 2, no. 1 (June 1, 2021): 34–38. http://dx.doi.org/10.52497/biom.v2i1.272.
Pailler, Thierry. "Un nouveau Cynorkis (Orchidaceae) pour la flore des Mascareignes." Plant Ecology and Evolution 153, no. 3 (November 23, 2020): 492–97. http://dx.doi.org/10.5091/plecevo.2020.1671.
Tematio Nague, Lionel, Emmanuel Mpondo Mpondo, Emmanuel Nnanga Nga, J. S. N. Foumane Maniepi, V. Soppo Lobe, J. A. Metego Ntsama, A. Minyem, et al. "Formulation et fabrication des suppositoires antipaludiques d’Artémisia annua d’Ouest Cameroun en utilisant le beurre de karité comme excipient." Journal Africain de Technologie Pharmaceutique et Biopharmacie (JATPB) 2, no. 3 (December 20, 2023). http://dx.doi.org/10.57220/jatpb.v2i3.156.
Tematio Nague, Lionel, Emmanuel Mpondo Mpondo, Emmanuel Nnanga Nga, J. S. N. Foumane Maniepi, V. Soppo Lobe, J. A. Metogo Ntsama, A. Minyem, et al. "Formulation et fabrication des suppositoires antipaludiques d’Artémisia annua d’Ouest Cameroun en utilisant le beurre de karité comme excipient." Journal Africain de Technologie Pharmaceutique et Biopharmacie (JATPB) 2, no. 3 (December 20, 2023). http://dx.doi.org/10.57220/jatpb.v2i3.61.
Дисертації з теми "Déclin des herbiers":
Cognat, Mathis. "Rôles des facteurs environnementaux et des interactions biomorphodynamiques sur l’évolution spatio-temporelle des herbiers de zostères dans une lagune mésotidale." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0170.
Seagrass meadows are a fundamental biological component and provide many ecosystem services in coastal areas. Understanding their evolution and interactions with their physical environment is a major scientific issue. In Arcachon Bay, seagrass meadows of Zostera notlei (the largest in Europe) and Zostera marina have sharply regressed over the last two decades. In the meantime, an increase in suspended sediment concentrations and significant morphological changes were observed. Based on this regional case study, the objectives of this thesis are to better underestand the physical causes of seagrass bed regression, and also to quantify the physical consequences of the egression and possible feedback processes.An extensive monitoring of biological, chemical and physical parameters at nine sites during one year showed the extreme variability of the environmental conditions to which the Z. noltei beds are subject in Arcachon Bay, the important demographic, morphological and biochemical differences between plants of different sites. Some of these differences reflect their ability to adapt to the intensity of a forcing. A logistic growth model has shown that in addition to light, the main parameters that control the development of Z. noltei at the scale of the bay are hydrodynamic forcing. However, at the local scale, other factors such as organic matter content or microtopography may be predominant.In a second step, an analysis combining historical data and hydrodynamic modelling scenarios showed that the maximum depth colonized by the two species of seagrass strongly declined between 1989 and 2016. This analysis suggests that lack of light had an effect on the evolution of the distribution of the two species. In addition, it was found that the regression of Z. noltei began on the steepest areas of the tidal flat, which correspond to the edges of the channels and were therefore subject to the most intense currents, suggesting again an effect of intensity of currents on the distribution of Z. noltei.The results of numerical simulations showed that the regression of both species induces a significant increase in hydrodynamic energy, not only locally in areas where the seagrass have declined, but also remotely, at the level of main channels and up to near the mouth.In addition, the hydrodynamic effects induced by the initial regression of Z. Marina (1989-2007) contributed to the first phase of the decline of Z. noltei meadows. These results partially confirm the hypothesis that feedback processes between hydrodynamics and regression of seagrass beds occurred during the first stage of seagrass decline. Furthermore, the direct hydrodynamic consequences of the first regression phase of the two species (1989-2007) accounted for more than 75% of the second regression phase of Z. noltei (2007-2012). These results fully confirm the existence of feedback processes and highlight their predominant role in the dynamics of Z. noltei meadows.As far as Z. marina is concerned, it finally appears that the current conditions do not allow colonization of the areas from which it disappeared. On the contrary, due to its intertidal position making it less susceptible to high turbidity, Z. noltei could recolonize some tidal flats that present favourable hydrodynamic conditions. This process of recolonization, leading to a reduction of the hydrodynamic energy and to the local improvement of the light conditions, could self-amplify by adjaceting to each other and then promote the recovery of Z. marina in the channels
Le, Pevedic Arnaud. "Études des interactions entre herbiers de zostères, hydrodynamique et dynamique sédimentaire dans une lagune semi-fermée : cas du Bassin d'Arcachon." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0041.
Seagrass meadows provide numerous ecosystem services and constitute a fundamental biological component for the sustainability of coastal environments. Over the past decades, the surface colonized by seagrasses has drastically declined globally, reducing their capacity to regulate hydrodynamic conditions and sediment fluxes. In this context, this work aims to better understand the response of hydro-sedimentary processes to the decline of intertidal seagrass in a shallow coastal lagoon. For this purpose, the Arcachon lagoon (France), extensively colonized by seagrass meadows (Zostera noltei and Zostera marina), was used as a study area. This analysis was conducted through a numerical modeling approach that required the preliminary development and implementation of a hydro-bio-sedimentary modeling platform, consisting of four coupled models (flow model, wave model, sediment transport model, and seagrass growth model), all accounting for the effect of vegetation. Specific attention was paid to the implementation of vegetation in the wave and sediment models, utilizing combined numerical, field, and laboratory experiments. The impact of seagrass decline was first studied on hydrodynamics, revealing significant changes in tidal hydrodynamics and the wave regime, especially an intensification in bottom current velocities by 100% and wave height by 50% on the tidal flats. Further investigation into the relative influence of seagrass decline and morphological evolutions of the inlet on tidal hydrodynamics showed that vegetation loss was the main factor influencing the modification of current velocities inside the lagoon. In response to the decline of Zostera spp. and the subsequent intensification of hydrodynamic conditions, this environment underwent significant changes in sediment dynamics. Modification of erosion and deposition fluxes resulted in suspended sediment concentrations 3 to 6 times higher in the areas where vegetation decreased the most. Seagrass decline also impacted sediment transport between the lagoon and the open ocean, as well as among different areas of the lagoon, leading to the redistribution of the different sediment classes and altering the composition of the seabed sediment. The tidal flats located along the coastlines accreted and became siltier, while those in the center of the lagoon eroded and became sandier. In particular, our results demonstrated that seagrass decline was the primary contributor to the observed bathymetric changes in the lagoon. Finally, potential evolutions of marine phanerogams were investigated, considering various consequences of climate change such as sea level rise and increase of temperature. For this analysis, special consideration was given to generating environmental forcing that reproduces potential temperature and water level conditions by 2050. Seagrass biomass exhibited contrasting responses to these processes, clearly dependent on multiple environmental factors (depth, hydrodynamic exposure, renewal time). We also showed that, beyond global warming, it is the increase in frequency and intensity of extreme temperature events that are expected to induce the most significant changes in seagrass biomass