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Eugénie Tessier, Charles-André Bost |
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Title |
Behavioural adjustments during foraging in two diving seabirds: king and macaroni penguins |
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2020 |
Publication |
Marine Biology |
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167 |
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9 |
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138 |
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Abstract |
Optimal foraging theory predicts that diving predators should maximise their energy intake while minimizing the costs of their foraging activities at depth. This hypothesis was tested in two breath-hold divers that foraged in the pelagic waters off Kerguelen Island, southern Indian Ocean. Macaroni penguins (Eudyptes chrysolophus) feed predominately on crustaceans at moderate depths (ca. 50 m), while king penguins (Aptenodytes patagonicus) feed on mesopelagic fish at deep depths (ca. 100–150 m). We instrumented 22 penguins with time-depth recorders during the breeding season of the 2014 southern summer, just before they went to sea. Birds were recaptured after one to five foraging trips and the dive data were analysed on the level of single dive cycles and entire dive bouts. Both species adjusted their diving behaviour and modulated their foraging activity in accordance with their experience in their previous dives. Foraging activity during a dive (in terms of number of wiggles per dive) was greater if birds targeted the same depth as the previous dive. The penguins spent less time at the surface between two prey capture attempt dives than when a prey capture attempt dive was preceded by a non-prey capture attempt dive. Dive bout analyses showed that foraging activity increased with bout duration, while transit time during dives decreased with bout duration. Our findings are in general agreement with predictions based on optimal foraging models. The results suggest that penguins anticipated the depth of their next dive based on their encounter of a prey patch in the previous dive and optimized their chances of feeding success by spending minimal time at the surface and in transit to the patch depth. Once penguins detected a prey patch, these behavioural adjustments allowed them to rapidly return to that patch, increasing their chances of feeding again before the prey disperses. |
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7737 |
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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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2020 |
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Master's report |
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1013 |
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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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Duc Marine |
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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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yes |
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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 |
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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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133 |
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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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Author |
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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119 |
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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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7757 |
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Eymar-Dauphin Pauline |
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Réponses des plantes aquatiques des Iles Kerguelen à l’intensification des contraintes thermiques de leur habitat. Approche par les hypervolumes. Master 2 ECOMONT, Université de Savoie Mont-Blanc (encadrement : A.-K. Bittebiere) |
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Master 2 |
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2020 |
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Rapport de l'université de Lyon 1 |
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7759 |
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Author |
Lebouvier Marc |
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Title |
Retour d'expérience sur l'éradication des ongulés introduits dans les îles subantarctiques |
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Conference - National - Communication |
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2020 |
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Atelier UICN France sur les espèces exotiques envahissantes en outre-mer, Fort de France, 10-13/02/2020 |
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7770 |
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