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Title |
Sub-millennial climate variability from high resolution water isotopes in the EDC ice core |
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Journal |
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Year |
2022 |
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EGUsphere |
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1-22 |
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The EPICA Dome C (EDC) ice core provides the longest continuous climatic record covering the last 800 000 years (800 kyrs). Obtaining homogeneous high resolution measurements and accounting for diffusion provide a unique opportunity to study the evolution of decadal to millennial variability within the past glacial and interglacial periods. We present here a compilation of high resolution (11 cm) water isotopic records with 27 000 ?18O measurements and 7 920 ?D measurements (covering respectively 94 % and 27 % of the whole EDC record), including published and new measurements (2 900 for both ?18O and ?D) over the last 800 kyrs on the EDC ice core. We show that overlapping measurement series performed over multiple depth ranges over the past 20 years, using different analytical methods and in different laboratories, are consistent within analytical uncertainty, and therefore can be combined to provide a homogeneous data set. A frequency decomposition of the most complete ?18O record and a simple assessment of the possible influence of diffusion on the measured profile shows that the variability during glacial periods at multi-decadal to multi-centennial timescale is higher than variability of the interglacial periods. This analysis shows as well that during interglacial periods characterized by a temperature optimum at its beginning, the multi-centennial variability is the strongest over this temperature optimum. |
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1110 |
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8462 |
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Title |
Circulation and water mass transports on the East Antarctic shelf in the Mertz Glacier region |
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Year |
2017 |
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Deep sea research part i: oceanographic research papers |
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126 |
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1-20 |
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452 |
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0967-0637 |
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8275 |
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Antoine Rocaboy |
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Title |
Soil microbial biomass and nutrient concentrations under the effect of vegetation cover, biological invasion and habitats of the Kerguelen Islands. |
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Master 1 |
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2022 |
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136 |
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yes |
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8469 |
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Antoine Stier, Quentin Schull, Pierre Bize, Emilie Lefol, Mark Haussmann, Damien Roussel, Jean-Patrice Robin, Vincent A. Viblanc |
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Title |
Oxidative stress and mitochondrial responses to stress exposure suggest that king penguins are naturally equipped to resist stress |
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2019 |
Publication |
Scientific Reports |
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9 |
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1 |
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1-12 |
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Exposure to unpredictable environmental stressors could influence animal health and fitness by inducing oxidative stress, potentially through downstream effects of glucocorticoid stress hormones (e.g. corticosterone) on mitochondrial function. Yet, it remains unclear whether species that have evolved in stochastic and challenging environments may present adaptations to alleviate the effects of stress exposure on oxidative stress. We tested this hypothesis in wild king penguins by investigating mitochondrial and oxidative stress responses to acute restraint-stress, and their relationships with baseline (potentially mirroring exposure to chronic stress) and stress-induced increase in corticosterone levels. Acute restraint-stress did not significantly influence mitochondrial function. However, acute restraint-stress led to a significant increase in endogenous antioxidant defences, while oxidative damage levels were mostly not affected or even decreased. High baseline corticosterone levels were associated with an up-regulation of the glutathione antioxidant system and a decrease in mitochondrial efficiency. Both processes might contribute to prevent oxidative damage, potentially explaining the negative relationship observed between baseline corticosterone and plasma oxidative damage to proteins. While stress exposure can represent an oxidative challenge for animals, protective mechanisms like up-regulating antioxidant defences and decreasing mitochondrial efficiency seem to occur in king penguins, allowing them to cope with their stochastic and challenging environment. |
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119 |
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2045-2322 |
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2045-2322 |
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yes |
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7529 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
Antoine, A. |
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Master 2 |
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2022 |
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The sea-ice zone constitutes the breeding and foraging habitat of large populations of ice-based species, pointing at its far-reaching ecological importance. Given its sensitivity to global warming, there is an urgent need for determining how predators use their environment, to understand and predict their response to climate variability. New perspectives are offered by miniature animal-borne sensors: in 2019, 3 sonar tags were deployed on lactating female Weddell seals for 7 days in Terre Adélie to study 3D animal movement and fine-scale predator-prey interactions. Lactating females demonstrated central-place foraging strategy, with restricted foraging area (3-6 km) and mostly benthic dives (97% of dives, visualising the seafloor on echograms). Their foraging effort was constrained by the presence of their pup: females spent most of their time hauling out (77% of overall recordings). The time spent underwater was mostly dedicated to diving (>5m) (1.36 on 7days, 854 dives recorded), as opposed to shallower under ice activities (<5m) (0.3 days). A total of 331 prey capture attempts (PrCA) were recorded, using tri-axial acceleration data, of which 125 prey (4.7 ± 1.5 cm on average) were identified by the sonar on 78 dives (4.24 ± 3.99 PrCA/dive). All PCA occur on the seafloor, at shallower depth than usual Weddell seal records (88 ± 30 m). Lactation is therefore a period of physiological stress, with foraging limited by pup compared with other parts of the life cycle. Using functional principal component analysis and model-based clustering on high resolution dive data, we found that PrCAs occur mostly in 2 of the 5 dive shape clusters. Foraging dives are characterised by W or V shape and high sinuosity, at the scale of the dive (W shapes) or during the ascent phase (V shapes). During the approach phase, seals constantly scan the area by regularly moving their head left to right, suggesting opportunistic behaviour. Shallow phase behaviour was studied using video recordings (2h recorded per seal). Seals spent most of their time interacting with their pup (33%) and hauling-out (42%). Most mother-pup interactions were on sea-ice (71%), as opposed to underwater (29%). The results suggest lactating females’ energy budget changes, with lactation being a period of physiological stress. This period of feeding pressure might put them at higher risk regarding adaptation to environmental variability. |
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1182 |
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yes |
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8747 |
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Antomarchi V. |
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Conference - International - Article with Reading Comitee |
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2010 |
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Abbreviated Journal |
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10 |
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101-112 |
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1043 |
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Bachelor's thesis |
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yes |
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3106 |
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Antomarchi V. |
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Conference - International - Article with Reading Comitee |
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2011 |
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1043 |
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yes |
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3442 |
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ANTOMARCHI V. |
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Conference - National - Communication |
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2009 |
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254 |
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ANTOMARCHI V. |
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Conference - International - Communication |
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2011 |
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1043 |
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1469 |
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Author ![sorted by Author field, ascending order (up)](img/sort_asc.gif) |
ANTOMARCHI V. |
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Conference - International - Article with Reading Comitee |
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2012 |
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371-385 |
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1043 |
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yes |
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3966 |
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