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Ambre Bébin |
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Title |
Catalogage de métadonnées et de données des projets de la zone atelier Antarctique et Terres Australes |
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Master 1 |
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2022 |
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Rapport de stage de master 1, université de rennes 1 (encadrement : D. Renault) |
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8037 |
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Dehouck, A.; Lafon, V.; Regniers, O.; Debonnaire, N.; Pillet, V.; Jensen, M.; Baltzer, A.; Garestier, F. |
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The Svalbard Archipelago: when distant erosion monitoring warns of the magnitude of climate impacts in the rest of the overpopulated world |
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Peer-reviewed symposium |
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2022 |
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Living planet symposium 2022, 23-27 may 2022, bonn, germany |
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1223 |
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8065 |
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Pillet, V.; Baltzer, A.; Jensen, M.; Besset, M.; Regniers, O.; Lafon, V.; Dehouck, A.; Garestier, F. |
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Title |
Shoreline change assessment in Svalbard Archipelago |
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Peer-reviewed symposium |
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2022 |
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Living planet symposium 2022, 23-27 may 2022, bonn, germany |
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Arctic coastal areas can experience higher erosion rates than temperate regions due to the combined influence of seasonal permafrost melt and extreme temperatures. In addition to these ordinary dynamics, high latitude coastal areas are even more affected by climate-induced changes such as increased weather hazards, rising temperatures or changes in river discharges and sediment supply. The Svalbard region consists of an archipelago of Arctic islands and a rocky and sandy coastline chiseled by numerous fjords connected to glaciers and a complex hydrographic network. Highly sensitive and exposed to the impacts of climate change, this coastal area is a perfect witness to the environmental changes of our century. The Svalbard Archipelago has recently become a key hotspot with an increasing number of studies, mainly focusing on glacier melt, temperature change or soil destabilization. The environmental, geographical, and geomorphological conditions of Svalbard make it extremely difficult to monitor coastal change on a large-scale. However, several studies, including Lim et al. (2020), Jaskolski et al. (2018), and Sisneros-Kidd et al. (2019), have highlighted the strong pressure of climate change, population, and human activities on the Svalbard coastal area. This littoral is fully in line with our approach to apprehend the past, present, and expected consequences of climate change on the environment and populations. In close collaboration with local researcher Maria Jensen from the University of Svalbard (UNIS) and other experts in France (Agnès Baltzer and Franck Garestier), we have explored the potential of the Copernicus Programme satellite images to produce key information on the past and recent dynamics of nearly 300 km of coastline on the archipelago. This is a major challenge, given the complexity of the environment and the meteorological and climatic conditions of the region, which limit the volume of usable spatial data (cloud cover and seasonal ice on the monitored sediments). After a first phase of adapting the algorithms to our developments, we extracted the coastline over 25 years, as well as the evolution of the banks and the extent of the hydrographic network along several major fjords in Svalbard. Particular attention was given to Advenfjorden to improve our effort, due to the greater availability of data to validate our results. We experienced the bathymetric monitoring into the fjord. This information was one of the most complex challenge in terms of methodology and algorithm development regarding the environmental context, but it is also a crucial insight to consider the full climate change impact on coastal sediment dynamics. Finally, we extracted another coastal indicator to focus on changes in the deltaic areas, namely the pioneer vegetation coverage, which reveals the impact of warming on these highly dynamic regions. For the first time, we present our new results issued from these investigations. |
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1223 |
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8465 |
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Denis Mercier, Emilie Portier, Armelle Decaulne, Etienne Cossart |
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Deep-seated gravitational slope deformation and rock-slope failures deposits in Iceland: inventory, dating and role in landscape evolution |
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Communication |
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2022 |
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10th International Conference on Geomorphology, ICG2022-165, Coimbra, 12-16 september 2022 |
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1266 |
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yes |
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8467 |
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Denis Mercier, Armelle Decaulne, Emilie Portier, Etienne Cossart |
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Title |
La datation des glissements de terrain paraglaciaires en Islande |
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Poster |
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2022 |
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7th conference Climat & impacts, 23-25 novembre 2022, Gif-sur-Yvette, France (hal-03867107) |
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Holocene Climatic Changes Landslides Paraglacial adjustment Rock slope failures |
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La fonte des glaciers islandais à partir de 15ka a été suivi par des ajustements paraglaciaires dont les glissements de terrain représentent une des manifestations les plus emblématiques. Un travail d’inventaire de leur répartition spatiale permet de comptabiliser plusieurs centaines de glissements, dont 158 dans la région du Skagafjörður au Nord de l’île, 186 dans les Westfjords et 290 dans les fjords de l’est. Les logiques spatiales de leur répartition permettent de montrer un contrôle lithologique à l’échelle globale avec une surreprésentation des glissements dans les basaltes d’âge tertiaire dans des régions où les contrastes topographiques sont par ailleurs majeurs à l’échelle de l’île. Au-delà de ces éléments spatiaux, la question de l’âge de leur mise en place se pose. Si l’on compare la chronologie de la déglaciation de l’Islande avec la répartition spatiale des glissements, nous observons une décroissance de l’occurrence potentielle des glissements de terrain avec le temps. La majorité des glissements se localisent le long des versants qui ont été libérés au tout début de la déglaciation. A l’échelle des glissements eux-mêmes, des études ponctuelles permettent de préciser l’âge de leur mise en place. Différentes approches sont alors mobilisées. La première prédate les glissements en utilisant l’emboîtement des formes géomorphologiques et l’âge des plages soulevées par le rebond glacio-isostatiques sur lesquelles viennent mourir les dépôts des glissements de terrain. La seconde série de mesures postdate les glissements. En effet, des dépressions au sein des glissements ont piégé des cendres volcaniques datées et des végétaux piégés dans des tourbières. Ainsi, par téphrochronologie et datation radiocarbone, il est possible d’obtenir des dates pour caler les événements gravitaires. Les modèles âge-profondeur sont également utilisés pour affiner les résultats. Ainsi, les glissements de terrain islandais, datés avec plus ou moins de précisions, donnent des âges postglaciaires compatibles avec le schéma d’une mise en place paraglaciaire dans les tous premiers temps de l’Holocène. |
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1266 |
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8468 |
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Author |
Antoine Rocaboy |
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Soil microbial biomass and nutrient concentrations under the effect of vegetation cover, biological invasion and habitats of the Kerguelen Islands. |
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Master 1 |
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2022 |
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Rapport de stage de master 1, université de rennes 1 (encadrement: D. Renault, P. Agnola, N. Lebris) |
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8469 |
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I.C. Barrio, D. Ehrich, E.M. Soininen, V.T. Ravolainen, C.G. Bueno, O. Gilg, A.M. Koltz, J.D.M. Speed, D.S. Hik, M. Mörsdorf, J.M. Alatalo, A. Angerbjörn, J. Bêty, L. Bollache, N. Boulanger-Lapointe, G.S. Brown, I. Eischeid, M.A. Giroux, T. Hájek, B.B. Hansen, S.P. Hofhuis, J.-F. Lamarre, J. Lang, C. Latty, N. Lecomte, P. Macek, L. McKinnon, I.H. Myers-Smith, Å.Ø. Pedersen, J.S. Prevéy, J.D. Roth, S.T. Saalfeld, N.M. Schmidt, P. Smith, A. Sokolov, N. Sokolova, C. Stolz, R. van Bemmelen, Ø. Varpe, P.F. Woodard, I.S. Jónsdóttir |
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Developing common protocols to measure tundra herbivory across spatial scales |
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2022 |
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Arctic Science |
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8 |
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3 |
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638-679 |
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Understanding and predicting large-scale ecological responses to global environmental change requires comparative studies across geographic scales with coordinated efforts and standardized methodologies. We designed, applied, and assessed standardized protocols to measure tundra herbivory at three spatial scales: plot, site (habitat), and study area (landscape). The plot- and site-level protocols were tested in the field during summers 2014–2015 at 11 sites, nine of them consisting of warming experimental plots included in the International Tundra Experiment (ITEX). The study area protocols were assessed during 2014–2018 at 24 study areas across the Arctic. Our protocols provide comparable and easy to implement methods for assessing the intensity of invertebrate herbivory within ITEX plots and for characterizing vertebrate herbivore communities at larger spatial scales. We discuss methodological constraints and make recommendations for how these protocols can be used and how sampling effort can be optimized to obtain comparable estimates of herbivory, both at ITEX sites and at large landscape scales. The application of these protocols across the tundra biome will allow characterizing and comparing herbivore communities across tundra sites and at ecologically relevant spatial scales, providing an important step towards a better understanding of tundra ecosystem responses to large-scale environmental change. |
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8339 |
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Author |
Charles Cantoni |
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Effect of thermal stress on the reproductive success and on the physiology of Anatalanta aptera. |
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Master 1 |
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2022 |
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Rapport de stage de master 1, université de rennes 1 (encadrement : e. daly) |
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8343 |
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Guillaume Gall |
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Elaboration de la typologie des habitats de l'île de la Possession (Archipel Crozet) |
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Master 2 |
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2022 |
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Rapport de stage de master 2, université de bretagne occidentale (encadrement : p. agnola, d. renault) |
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8345 |
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Thomas Guiguitant |
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Etude des stratégies de vie d’espèces de macrophyte (Limosella australis) de l’archipel des Kerguelen |
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Master 1 |
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2022 |
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Master 1 Bee, université Lyon 1 (encadrement : A.-K. Bittebiere) |
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8349 |
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