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2023 |
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Marine environmental research |
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192 |
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Pages |
106220 |
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Keywords |
Benthic-pelagic coupling Clams East Antarctica Food source Growth Ice Master chronology Sclerochronology Sympagic algae |
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1124 |
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0141-1136 |
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yes |
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8661 |
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Author |
Emilie Portier, Denis Mercier, Armelle Decaulne |
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Title |
Spatial analysis and controlling factors of landslides in East Icelandic fjords |
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2023 |
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29 |
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1 |
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1266 |
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1266-5304 |
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9782913282988 |
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yes |
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8662 |
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Title |
A New Posthole Seismometer at Concordia Permanent Research Facility in the Heart of the Icy East Antarctic Plateau |
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2023 |
Publication |
Seismological research letters |
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133 |
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0895-0695 |
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8663 |
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Title |
Recruitment dynamics of Hiatella arctica within a high Arctic site (Young Sound Fjord, NE Greenland) |
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2023 |
Publication |
Polar biology |
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46 |
Issue |
12 |
Pages |
1275-1286 |
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Keywords |
Arctic Bivalve recruitment Lipids classes Prodissoconch II |
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Abstract |
Recruitment dynamics including what determines the success or failure of Arctic benthic invertebrates are poorly known despite their important role for population dynamics. The main objective of this study was to assess the potential influence of extreme physical constraints related to freshwater discharge on the recruitment of a dominant bivalve Hiatella arctica within a High Arctic fjord (Young Sound, NE Greenland). We collected young recruits over several sampling periods from 2016 to 2018 at two contrasting sites (inner vs. middle fjord) for 5-weeks to 12-months and measured their abundance, size at metamorphosis and lipid class composition. Young stages of H. arctica settled from June to the end of October, when trophic conditions are optimal. We hypothesize that growth stops during winter due to poor trophic conditions. Data suggest that abundance of recruits, their total lipid concentration and composition of lipid classes are similar at both sites. However, size classes were different with six separate cohorts detected at one station and one at the inner station, which may be attributed to discrete spawning events and possible secondary migration. Based on an assessment of their potential age, we hypothesize that spat batches recruiting earlier in the summer exhibit better growth performance probably related to better food quality and quantity. |
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1158 |
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1432-2056 |
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yes |
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8664 |
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Author |
Baltzer A., Gourillon L., Lacombe V., Guilhermic C., Nardelli P., Howa H., Pillet V., Nicolas J., Tafflet A., Verdun J. |
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Title |
Le projet KONBHAS : Kongsfjorden New Benthic Habitats |
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Peer-reviewed symposium |
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2023 |
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1223 |
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yes |
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8665 |
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Stier A., Viblanc V., Kauffmann M., Pardonnet S., Gineste B., Robin Jp. & Bize P. |
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Peer-reviewed symposium |
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2023 |
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Les milieux polaires et subpolaires ne sont pas dépourvus de parasites. Chez les manchots royaux, les ectoparasites tels que les tiques (Ixodes uriae) sont suspectés d’avoir des effets marqués sur la santé et le succès reproducteur des adultes. En utilisant un traitement expérimental réduisant drastiquement l’abondance d’ectoparasites chez des adultes reproducteurs, nous avons pu démontrer que l’infestation par les ectoparasites induit une augmentation du stress physiologique caractérisé par des taux élevés de corticostérone (glucocorticoïde) et une situation de stress oxydant. Bien que l’éradication des ectoparasites n’ait pas d’influence notable sur le succès d’éclosion des œufs ou la survie des poussins durant l’élevage, le traitement améliore visiblement la croissance des poussins jusqu’à l’émancipation, avec des effets positifs probables sur leur survie future. Il semble donc que les ectoparasites exercent une pression de sélection naturelle non-négligeable chez le manchot royal. |
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119 |
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yes |
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8666 |
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Author |
Noiret A., Viblanc V., Bocquet C., Lemmonier C., Lewden A., Robin Jp., Bize P. &Amp; Stier A. |
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Title |
HotPenguin: stress thermique et agressivité soutiennent l’hypothèse température-agression chez le manchot royal en période de reproduction |
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Peer-reviewed symposium |
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2023 |
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Les endothermes polaires et subpolaires, adaptés à un climat froid, pourraient se révéler particulièrement sensibles au stress thermique dans un contexte de réchauffement global. L'hypothèse température-agression – qui propose un lien causal entre températures ambiantes élevées et motivation agressive – pourrait accentuer le stress thermique. Essentiellement étudiée pour des raisons socio-économiques, l’hypothèse est peu investiguée chez les espèces sauvages. L’étude de manchots royaux en période de reproduction (n= 85, Crozet), a permis de mettre en évidence des relations positives entre paramètres climatiques (température, radiation solaire), température sous-cutanée, indicateurs comportementaux de stress thermique (halètement, écartement des ailerons) et agressivité envers les congénères. Nos résultats ouvrent de nouvelles perspectives écologiques pour l'hypothèse température-agression, et encouragent l'étude du stress thermique dans les écosystèmes polaires. |
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119 |
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yes |
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8667 |
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Author |
Hennion Françoise, Binet Françoise |
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Title |
Adaptation des plantes subantarctiques au changement climatique et dynamique et trajectoires sol-plante |
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Peer-reviewed symposium |
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2023 |
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Les îles subantarctiques de Kerguelen sont soumises à un changement climatique rapide et intense. Ces îles abritent des espèces végétales endémiques de grand intérêt dans l’hémisphère sud. La flore comporte peu d’espèces et leurs interactions sont mal connues. De tels systèmes pourraient être particulièrement fragiles, et a contrario leur résilience dépendre plus fortement des interactions biotiques entre espèces. Le projet PlantADAPT vise à évaluer et suivre la réponse des espèces de plantes endémiques des îles Kerguelen au changement climatique, en prenant en compte le système plante-sol intégré et les interactions biotiques (plante holobionte). Dans l’objectif d’évaluer les parts respectives de la plasticité phénotypique et de l’adaptation locale dans la variation phénotypique, l’expérience en Jardins Communs est un dispositif déterminant. Nous développons aussi des approches d’écologie fonctionnelle des communautés microbiennes et du système sol associé. |
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1116 |
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8668 |
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Author |
Le Bris T., Barruol, G., Gimbert F., Le Meur E., Zigone, D. |
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2023 |
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1214 |
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8669 |
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Armynot du Chatelet E. |
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2023 |
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1200 |
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yes |
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8670 |
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