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Sacré N. |
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Title |
Modélisation des réseaux trophiques dans les environnements marins côtiers des Iles Kerguelen |
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Master 2 |
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2020 |
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Master 2 Sciences de la Mer, Sorbonne Université / Université de Bourgogne |
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48 pp |
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1044 |
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8060 |
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Author |
Meudec L. |
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Title |
Caractérisation des habitats marins benthiques en zones côtières aux Iles Kerguelen par analyse d’images sous-marines |
Type |
Master 1 |
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2020 |
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Master 1 Sciences de la Mer, Sorbonne Universités / Université de Bourgogne Franche Comté |
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13 pp |
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1044 |
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8061 |
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Author |
Natacha Garcin |
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Title |
The effects of stress hormones on king penguin's growth, energetics and ageing rate |
Type |
Master 2 |
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Year |
2020 |
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35 |
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Stress exposure and stress response are likely to vary according to life history strategies and across environmental contexts. If the release of glucocorticoids (e.g. corticosterone, CORT) in response to acute stress enables animals to rightfully cope with the situation, chronic exposure to high CORT levels can lead to deleterious cascading effects on animal’s physiology, behavior and fitness. Some species may be more adapted to cope with stressful events than others and might exhibit natural adaptations to limit the adverse consequences of prolonged high CORT levels. The aim of this study was to investigate the effects of experimentally elevated CORT levels on the growth, energetics and ageing of king penguin chicks (Aptenodytes patagonicus), using sub-cutaneous CORT implants. We investigated the effects of CORT both on the medium (23 days
after implant) and the long-term (fledging: ~ 200 days after the implant) on morphological (i.e. body mass and size), behavioral (i.e. aggressivity, physical activity) and physiological traits (i.e. heart rate, CORT response to acute stress, oxidative stress, mitochondrial density and telomere length). Although CORT-treated chicks were taller, more aggressive and displayed lower CORT response to acute stress on the medium-term, there was no significant impact of CORT on the body mass and whole-body energetics assessed through heart rate and physical activity. Moreover, CORT chicks displayed lower oxidized glutathione on the medium and long-term, thus indirectly preventing
oxidative damage, while telomere length and mitochondrial density were not influenced by CORT implants. Although chronic elevation of glucocorticoid levels is mostly known to result in negative physiological and behavioral outcomes, our results indicating some positive effects of CORT implants are consistent with the hypothesis that species who encounter several noxious stressors in their environment, could be naturally adapted to cope with them. The growth-enhancing effect of CORT might be mediated by a higher efficiency at which food is assimilated and/or used, and CORT chicks might benefit from aggressive behaviors during competitive interactions or predation
encounters. Through the antioxidant glutathione system, CORT treated chicks seem to have developed a resistance to oxidative stress that could last over time (i.e. possibly through a reduction
of ROS production). While CORT implants did not accelerate ageing or bring short and mediumterm costs, possible long lasting programming effects of CORT should be further investigated. |
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8101 |
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Author |
Valentin Wierner |
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Title |
Couverture nuageuse et précipitations neigeuses à Dumont d’Urville |
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Master |
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Year |
2020 |
Publication |
Master's report |
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1013 |
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Bachelor's thesis |
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7743 |
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Téchiné P., G. Alory, L. Testut, L'us-imago Brest &Amp; Nouméa Et La Dt/insu Brest. |
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ROSAME / SSS – Gestion d'observations océanographiques |
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Peer-reviewed symposium |
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2020 |
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Journées Développement Logiciel (JDEV), 6-10 juillet 2020, visioconférence |
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688 |
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7746 |
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Author |
Duc Marine |
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Title |
Déclencher par la mise à distance ? Saisir l'expérience de la salle de classe par le story telling, politique des petites histoires et retour critique sur une initiative méthodologique |
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Peer-reviewed symposium |
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2020 |
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Colloque “l’éducation en situation migratoire”, 12-13 novembre 2020, Suresnes |
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Nb: Postponed Due To Covid Crisis |
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1213 |
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7749 |
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Author |
Charlotte Groult |
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Title |
Effet des marées sur la cryo-sismicité côtière en Antarctique |
Type |
Master |
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Year |
2020 |
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Master 2 stpe sciences de la terre, des planètes et de l’environnement filière « master excellence », université de Strasbourg |
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L’étude sismologique de la glace permet de mieux comprendre la déformation des systèmes glaciaires et leur stabilité́ dans un contexte de réchauffement climatique global. La cryosphère est très active sismiquement. De nombreux évènements comme des icequakes, des trémors glaciaires ou des évènements à l’interface glace/terre solide émanent de la base des glaciers, des marges de cisaillement, des vêlages au front des glaciers ou encore des chenaux d’eau sous- glaciaire. Nous avons observé les signaux d’une dizaine de stations sismologiques sur les côtes de l’antarctique et parmi tous les évènements visibles, un signal de quelques heures présente une forte répétabilité́ dans le temps et dans l’espace. Pour l’étudier nous avons extrait des séries temporelles d’énergie sismique sur trois stations : drv, thur, vna1 et nous avons montré sa modulation avec les forçages de marée d’abord sur l’année 2018 puis sur 8 ans à thur, 10 ans à vna1 et 20 ans à drv. Le signal d’énergie sismique présente toutes les périodicités des forçages de marée avec cependant quelques décalages temporels, indicateurs de délais de réponse du système glaciaire et d’un comportement rhéologique viscoélastique de la glace. |
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7752 |
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Do Rosario Valentin |
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Ecological, biological and physiological effects of climate change on insect species. Master 1 EFCE, Université de Rennes 1 (Encadrement : D. Renault) |
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Master 1 |
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2020 |
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Rapport de l'université de Rennes 1 |
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7753 |
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Chelsea Ward |
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Examining the effect of experimentally induced stress and the stress response on eye region surface temperature in wild king penguins (Aptenodytes patagonicus) (supervisors P Bize and A Lewden) |
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Master 1 |
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2020 |
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7755 |
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Author |
Moynard Fanny |
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L’exposition des insectes aux insecticides accroît-elle leur sensibilité au réchauffement climatique? Master 1 EFCE, Université de Rennes 1 (Encadrement: D. Renault) |
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Master 1 |
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2020 |
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Rapport de l'université de Rennes 1 |
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