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Lemonnier C., Schull Q., Stier A., Boonstra R., Delahanty B., Lefol E., Durand L., Pardonnet S., Robin Jp., Criscuolo F., Bize P., Viblanc Va |
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Adaptive phenotypic programming to social density in king penguins |
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Peer-reviewed symposium |
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2023 |
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11th international penguin conference., 4-9 september 2023., viña del mar., chile |
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8731 |
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Portier E., Mercier D., Decaulne A. |
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Title |
Les glissements de terrain dans les Westfjords et les fjords de l'Est d'Islande : inventaire, morphométrie et variables explicatives |
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Peer-reviewed symposium |
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2023 |
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Journées des Jeunes Géomorphologues, Groupe Français de Géomorphologie, 31 mai -1er juin 2023, Dunkerque, France |
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Deglaciation Iceland Landslides Paraglacial |
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Les Westfjords et fjords de l’Est de l’Islande concentrent de nombreux glissements de terrain. Ces phénomènes visibles par observation à distance d’images satellites et d’un Modèle Numérique de Terrain (MNT) ont été inventoriés, puis mesurés et analysés. Au total, 251 et 290 glissements de terrain ont été recensés respectivement dans les Westfjords et les fjords de l’Est, au sein d’une base de données et dans un Système d’Informations Géographiques (SIG). Pour chaque glissement de terrain, sa localisation, sa morphométrie (longueur, largeur, superficie, épaisseur, volume estimé, …), ainsi que de potentielles variables de contrôle, notamment géologiques (lithologie, pendage), ou explicatives (orientation, âge de la déglaciation du versant affecté par le glissement de terrain) ont été relevées. Ces variables et la répartition des glissements ont été étudiées par analyse spatiale et statistique. Ce travail fournit un inventaire complémentaire des glissements de terrain pour ces deux secteurs. Cependant, les facteurs de déclenchement habituellement identifiés ne permettent pas une explication satisfaisante à leur répartition. Néanmoins, des pistes de réflexions se dessinent et l’élargissement de la base de données à l’échelle de l’Islande permet de les comparer d’un secteur à l’autre. Cette étude met en avant des foyers principaux de glissements de terrain : pour les Westfjords, une plus forte densité de glissements de terrain dans le nord-ouest de la zone étudiée et dans la partie la plus étroite de la péninsule ; et pour les fjords de l’Est, une plus forte densité dans le Nord de la zone étudiée. Ces foyers pourraient s’expliquer par les directions d’écoulement de la calotte glaciaire passée. D’autre part, un des constats est une surreprésentation des glissements orientés vers l’ouest et le sud pour les fjords de l’Est, et vers le sud et l’est pour les Westfjords. L’hypothèse proposée est un contrôle climatique : les versants davantage ensoleillés auraient subi une déglaciation plus rapide favorisant l’instabilité des versants. Les données recueillies suggèrent également que la lithologie (basaltes tertiaires) est une variable de contrôle et que la période pendant laquelle la zone de glissement de terrain est déglacée est une variable explicative de l'initiation du glissement de terrain. Les glissements de terrain observés s’inscriraient ainsi dans une dynamique paraglaciaire d’instabilité des versants après la phase de déglaciation |
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8732 |
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Tafflet A, Nicolas J., Boy JP., Lemoine JM., Peronzans F., Durand F., Gourillon L., Baltzer A., Verdun J. |
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Title |
Ice melting impact on crustal deformation observed by space geodesy in Svalbard |
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Peer-reviewed symposium |
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2023 |
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4th Svalbard Science Conference 2023, 31 October-1 November 2023, Scandic Fornebu, Oslo |
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1223 |
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8733 |
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Guilhermic C., Mouret A., Howa H., Pusceddu A., Baltzer A., Nardelli M.P. |
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Effect of environmental gradients generated by tidewater glacier melting on sedimentary habitats and benthic meiofauna in Kongsfjorden (Svalbard): seasonal observations |
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Peer-reviewed symposium |
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2023 |
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4th svalbard science conference 2023, 31 october-1 november 2023, scandic fornebu, oslo |
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1223 |
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8736 |
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Nicolas J., Verdun J., Baltzer A., Boy JP., Lemoine JP., Perosanz F., Tafflet A., |
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Title |
SIGNEAU : Signatures climatiques des surcharges hydrologiques observées par géodésie spatiale |
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Peer-reviewed symposium |
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2023 |
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Journées scientifiques de l'OSUNA, 5 juin 2023 |
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1223 |
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8738 |
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Mojtahid M., Fossile E., Santoni S., Husum K., Streuff K., Forwick M., Howa H., Nardelli MP. |
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Benthic foraminifera as tools to reconstruct past tidewater glacier dynamics: A case study from Kongsfjorden (Svalbard) |
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Peer-reviewed symposium |
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2023 |
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International symposium on foraminifera forams 2023, 26-30 june 2023, perugia, italy |
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1223 |
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yes |
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8741 |
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Adélie Antoine, Sara Labrousse, Pauline Goulet, Mathilde Chevallay, Joris Laborie, Baptiste Picard, Christophe Guinet, David Nerini, Jean-Benoît Charrassin, Karine Heerah |
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Beneath the Antarctic sea-ice: Fine-scale analysis of Weddell seal (Leptonychotes weddellii) behavior and predator–prey interactions, using micro-sonar data in Terre Adélie |
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2023 |
Publication |
Ecology and Evolution |
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13 |
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12 |
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e10796 |
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bio-logging diving foraging behavior predator–prey interaction sonar tags Weddell seal |
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Abstract |
Lactation is the most energy-demanding event in mammals' reproduction. In pinnipeds, females are the only food providers to the young and have developed numerous behavioral and physiological lactation strategies, from capital-breeding to income-breeding. Lactating females' fine-scale foraging strategy, and precise understanding of how females supplement their pup's needs as well as their own are important to understand the species' ecology and energetic balance. Polar pinnipeds, inhabiting extreme environments, are sensitive to climate change and variability, understanding their constraints and foraging strategy during lactation is therefore important. In 2019, three sonar tags were deployed on lactating Weddell seals in Terre Adélie (East Antarctica) for 7 days, to study fine-scale predator–prey interactions. Feeding activity was mostly benthic, reduced, central-placed, and spatially limited. Females spent most of their time hauled-out. A total of 331 prey capture attempts (PrCAs) were recorded using triaxial acceleration data, with 125 prey identified on echograms (5 cm, acoustic size). All PrCAs occurred on the seafloor, shallower than usual records (mean depth of 88 m, vs 280 m after their molt). We also found that they only fed in three of the five identified dive shapes, during the ascent or throughout the dive. Half of the prey were reactive to the seal's approach, either leaving the seafloor, or escaping just above the seafloor, suggesting that the seals hunt by chasing them from the seabed. Seals continuously scanned the area during the approach phase, evoking opportunistic foraging. Our results provide additional evidence that Weddell seal forage during lactation, displaying a mix of capital-breeding and income-breeding strategies during this period of physiological stress. This work sheds light on previously unexplored aspects of their foraging behavior, such as shallow water environments, targeting benthic prey, generally focusing on single prey rather than schools, and evidence of visual scanning through observed head movements. |
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2045-7758 |
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8745 |
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Antoine A., Johnson M.; Labrousse S., Goulet P., Chevallay M., Laborie B., Picard B., Guinet C., Nerini D., Charrassin J.-b., Heerah K. |
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Beneath the Antarctic sea-ice: Fine-scale analysis of Weddell seal behavior and predator-prey interactions, using micro-sonar data in Terre Adélie. |
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Peer-reviewed symposium |
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2023 |
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Scientific commitee on antarctic research symposium 2023, christchurch, new zealand |
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1182 |
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8746 |
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Author |
Lissa Gourillon |
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Title |
Evolution des deltas et prodeltas du Lovenbreen depuis 2009 |
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Master 1 |
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2023 |
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Etudiante d'intechmer- stage de 5 mois- encadrante : a. baltzer |
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65 p |
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1223 |
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8750 |
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Guillaume Hubert, Philippe Ricaud, Vincent Favier, Jonathan Wille |
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Title |
Impact of the atmospheric river occurring in March 2022 on east Antarctica on Cosmic-Rays measurements |
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Peer-reviewed symposium |
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2023 |
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Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) |
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The primary cosmic rays (CRs) interact with atmospheric atoms, producing secondary CRs (neutron, proton, muon etc.). Meteorological conditions influence the secondary CRs properties, such as the atmospheric pressure and the hydrometric properties (snowfall, the atmospheric water vapor and liquid water, the soil moisture). The CHINSTRAP project aims at recording CR induced-neutron spectra at Concordia Antarctic station, over a wide energy range from meV up to tens of GeV with a short time resolution. At the same time, a radiometer records continuously the water vapor contents and temperatures profiles (HAMSTRAD project). In March 2022, an atmospheric river (AR) caused some of the highest temperature anomalies ever observed over Antarctica (absolute temperature record of -9.4 °C on March 18th at Concordia). The ARs transport large amounts of moisture from the mid- to high-latitudes, modifying considerably usual dry conditions observed at Concordia. This AR event attenuated CRs measurements at Concordia, something previously never observed. A first analysis shows a correlation between the CR induced neutron flux decreases (in the order of 15%) and the increases of the integrated water vapor and liquid water path (IWV and LWP, respectively). This work demonstrates the importance of CRs attenuation during particle transport mechanisms in a highly saturated atmosphere. |
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1112 |
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8752 |
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