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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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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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Title |
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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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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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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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 |
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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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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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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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Author |
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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Efflam Sterenn |
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Capacités de récupération d’une mouche native des régions polaires, Anatalanta aptera, après une exposition à des pics de chaleur |
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2023 |
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Rapport de stage de master 1 imabee, univ rennes |
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8753 |
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Manzo Emilie |
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Caractérisation des changements morphologiques des populations de Merizodus soledadinus (Coleoptera) suite à la colonisation de nouveaux habitats dans les îles Kerguelen |
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Master 1 |
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2023 |
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Rapport de stage de master 1 imabee, univ rennes |
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8754 |
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