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Статті в журналах з теми "Herbiers de zostères":
Froidefond, Jean-Marie, Virginie Lafon, and Xavier De Montaudouin. "Variations saisonniere et annuelle de l'indice ndvi en relation avec les herbiers de zosteres (zostera noltii) par images satellites SPOT : exemple du bassin d'Arcachon (France)." Revue Française de Photogrammétrie et de Télédétection, no. 197 (April 22, 2014): 52–62. http://dx.doi.org/10.52638/rfpt.2012.81.
Puech, Christian, Michel Deshayes, and Yolanda Navarro. "Images, modèles et biomasse immergée. Cartographie des herbiers de zostères en Camargue à partir d'images SPOT-5." Revue internationale de géomatique 15, no. 2 (June 30, 2005): 143–57. http://dx.doi.org/10.3166/rig.15.143-157.
Mahéo, Roger A., and Pierre Denis. "Les bernaches hivernant dans le golfe du Morbihan (sud Bretagne) et leur impact sur les herbiers de Zostères : premiers résultats." Revue d'Écologie. Supplément 42, no. 4 (1987): 35–45. http://dx.doi.org/10.3406/revec.1987.6250.
Fournier, Jérôme. "Analyse spatiale de l'impact d'une perturbation anthropique sur un herbier de zostères en baie de Locquirec (Bretagne nord)." Norois 189, no. 1 (2002): 47–55. http://dx.doi.org/10.3406/noroi.2002.7053.
Cardinal, Jérôme, Christelle Audouit, and Caroline Rufin-Soler. "Préserver les herbiers de zostères face aux mouillages sauvages : la difficile construction d’une politique environnementale sur l’île de Ré." VertigO, Volume 22 numéro 1 (April 20, 2022). http://dx.doi.org/10.4000/vertigo.35115.
Дисертації з теми "Herbiers de zostères":
Ganthy, Florian. "Rôle des herbiers de zostères (Zostera noltii) sur la dynamique sédimentaire du Bassin d’Arcachon." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14436/document.
The intertidal flats in the Arcachon lagoon are extensively colonized by seagrass meadows of Zostera noltii. The last ten years these meadows experienced a drastic regression of their surface area. Understanding the impact of seagrass on hydrodynamics and sediment dynamics is required to anticipate the consequences of meadows regression on the sediment dynamics of the Arcachon lagoon.Flume experiments with natural seagrass highlighted a strong velocity attenuation associated with a turbulence increase near the bed within seagrass canopies. An increase in sediment protection from erosion and in deposition fluxes related to the seagrass growth was found.Erosion tests showed seasonal variability of sediment resistance against erosion associated with changes in sediment characteristics. The bed stabilization induced by the root system and its seasonality was also observed. A parameterization of the erosion law was found.The in-situ survey of sediment altimetry, sediment and biometric characteristics showed a significant trend to sediment deposition on colonized sites, while erosion occurred on the unvegetated site. On the vegetated sites, surface sediment evolutions are correlated to the seagrass growth. Sediment became finer during the growth while the sand content rose during the end-of-season die-off.The hydrodynamic model MARS-3D was modified to take into account for seagrass and its flexibility on hydrodynamics and produced good simulation of velocity profiles in presence of seagrasses
Auby, Isabelle. "Contribution à l'étude des herbiers de Zostera Noltii dans le bassin d'Archachon : Dynamique, production de dégradation, macrofaune associée." Bordeaux 1, 1991. http://www.theses.fr/1991BOR10550.
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
Bargain, Annaëlle. "Etude de la structure et de la dynamique des herbiers de Zostera noltii par télédétection multi et hyperspectrale." Phd thesis, Nantes, 2012. http://www.theses.fr/2012NANT3031.
Bargain, Annaëlle. "Etude de la structure et de la dynamique des herbiers de Zostera noltii par télédétection multi et hyperspectrale." Phd thesis, Université de Nantes, 2012. http://tel.archives-ouvertes.fr/tel-00799897.
Bernard, Guillaume. "Mesures expérimentales et modélisation du remaniement sédimentaire dans le bassin d’Arcachon." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14821/document.
Sediment particle mixing, defined as the movements of sediment particles induced by benthic fauna, is one of the two components of bioturbation by benthic organisms. It is a key process of the ecological functioning in coastal areas. This manuscript presents an integrated study of sediment particle mixing process from the single sediment particle to the whole benthic community.The development of a new experimental approach, coupling high frequency acquisition of time series images of luminophores motions along thin aquaria glass walls, allowed for the direct measurement of elementary particle motions induced by the bivalve Abra alba. This constitutes the first experimental assessment of sediment particle mixing “fingerprints” in a marine invertebrate, according to the CTRW (Continuous Time Random Walk) model formulation.The deployment of this new approach also allowed for the determination of the control of water temperature and of fresh organic matter availability on sediment particle mixing induced by Abra alba. Moreover, the temporal (i.e., during 48h experiments) and spatial (i.e., over the whole section of the sediment column affected) dynamics of these effects were considered.At last, sediment particle mixing intensities induced by the whole benthic community were assessed in-situ in Arcachon Bay, within both a Zostera noltii meadow and a bare sediment mudflat where phanerogams were previously present. These results highlighted the restrictive effect of phanerogams themselves and of a restricted number of key benthic species, on sediment particle mixing
Bernard, Guillaume. "Mesures expérimentales et modélisation du remaniement sédimentaire dans le bassin d'Arcachon." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00874553.
Do, Van Tu. "Évolution et santé des herbiers à Zostera noltii dans le bassin d'Arcachon à travers la dynamique de la macrofaune benthique associée." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14561/document.
The overall objective was to assess macrobenthos response to marine Zostera noltii seagrass dynamics (colonization, maturation, destruction, restoration), in Arcachon Bay, a French Southwestern lagoon.When seagrass starts to develop, the structure of macrofauna community immediately diverges between sand and seagrass habitats, without however modifying tested biotic indices (BENTIX, BOPA, AMBI). As well, population of the dominant bivalve, the cockle (Cerastoderma edule), suffers from seagrass development. Their parasite (trematode) community are impacted, but not sufficiently to explain cockle deficit in seagrass.At the scale of the Bay, seagrass development (considered as a sign of “good health”) is compared to the fitness of the two dominant infaunal bivalves, the Manila clam (Ruditapes philippinarum) and the cockle (Cerastoderma edule), measured in terms of disease prevalence. There was no correlation among seagrass cover rate and the prevalence of three diseases: trematodiosis, perkinsosis and Brown Muscle Disease.Between 2002 and 2010, seagrass cover decreased by 1/3. When looking at community structure and dominant species, there were moderate differences within (among 12 stations) and among years, independently of seagrass decline. Among biotic indicators, multivariate index MISS was in adequation with the relative similarity of macrofauna structure among groups discriminated by MISS analysis.In 2005, dredging activities in Arcachon Bay led in burying 0.32 km2 of Z. noltii. Macrobenthos structure was immediately modified and did not recover in places buried by sand. Conversely, macrobenthos (infauna) recovered rapidly in areas cover by mud, while seagrass began to develop again five years after work. The last chapter of the thesis provides a brief insight of the seagrass in Vietnam, the actual knowledge and what could be investigated
Delgard, Marie Lise. "Étude des effets et du rôle des herbiers à Zostera noltii sur la biogéochimie des sédiments intertidaux." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00847777.
Тези доповідей конференцій з теми "Herbiers de zostères":
GANTHY, Florian, Aldo SOTTOLICHIO, and Romaric VERNEY. "Dynamique sédimentaire d'un estran lagunaire colonisé par un herbier de zostères (Bassin d'Arcachon, France)." In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2010. http://dx.doi.org/10.5150/jngcgc.2010.031-g.