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Title |
Hormetic response triggers multifaceted anti-oxidant strategies in immature king penguins (Aptenodytes patagonicus) |
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Journal |
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Year |
2016 |
Publication |
Free Radical Biology and Medicine |
Abbreviated Journal |
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Volume |
97 |
Issue |
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Pages |
577-587 |
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Keywords  |
Hormesis Lipid composition Mitochondria Oxidative stress Penguin Redox homeostasis |
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Abstract |
Repeated deep dives are highly pro-oxidative events for air-breathing aquatic foragers such as penguins. At fledging, the transition from a strictly terrestrial to a marine lifestyle may therefore trigger a complex set of anti-oxidant responses to prevent chronic oxidative stress in immature penguins but these processes are still undefined. By combining in vivo and in vitro approaches with transcriptome analysis, we investigated the adaptive responses of sea-acclimatized (SA) immature king penguins (Aptenodytes patagonicus) compared with pre-fledging never-immersed (NI) birds. In vivo, experimental immersion into cold water stimulated a higher thermogenic response in SA penguins than in NI birds, but both groups exhibited hypothermia, a condition favouring oxidative stress. In vitro, the pectoralis muscles of SA birds displayed increased oxidative capacity and mitochondrial protein abundance but unchanged reactive oxygen species (ROS) generation per g tissue because ROS production per mitochondria was reduced. The genes encoding oxidant-generating proteins were down-regulated in SA birds while mRNA abundance and activity of the main antioxidant enzymes were up-regulated. Genes encoding proteins involved in repair mechanisms of oxidized DNA or proteins and in degradation processes were also up-regulated in SA birds. Sea life also increased the degree of fatty acid unsaturation in muscle mitochondrial membranes resulting in higher intrinsic susceptibility to ROS. Oxidative damages to protein or DNA were reduced in SA birds. Repeated experimental immersions of NI penguins in cold-water partially mimicked the effects of acclimatization to marine life, modified the expression of fewer genes related to oxidative stress but in a similar way as in SA birds and increased oxidative damages to DNA. It is concluded that the multifaceted plasticity observed after marine life may be crucial to maintain redox homeostasis in active tissues subjected to high pro-oxidative pressure in diving birds. Initial immersions in cold-water may initiate an hormetic response triggering essential changes in the adaptive antioxidant response to marine life. |
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131 |
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0891-5849 |
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0891-5849 |
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yes |
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7221 |
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Title |
Homing and Nest Recognition in Nocturnal Blue Petrels: What Scent May Attract Birds to their Burrows? |
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Year |
2023 |
Publication |
Journal of Chemical Ecology |
Abbreviated Journal |
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Keywords |
Homing Behavior Nest Air Odor Olfaction Orientation Procellariform Seabirds TD-GC-TOF-MS |
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354 |
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ISSN |
1573-1561 |
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yes |
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Serial |
8630 |
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Author |
Solomina Olga N, Bradley Raymond S, Hodgson Dominic A, Ivy-Ochs Susan, Jomelli Vincent, Mackintosh Andrew N, Nesje Atle, Owen Lewis A, Wanner Heinz, Wiles Gregory C, Young Nicolas E, |
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Title |
Holocene glacier fluctuations |
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Journal Article |
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Year |
2015 |
Publication |
Quaternary Science Reviews |
Abbreviated Journal |
0277-3791 |
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Volume |
111 |
Issue |
3 |
Pages |
9-34 |
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Keywords |
Holocene, Glacier variations, Global warming, Neoglacial, Holocene thermal maximum, Orbital forcings, Solar activity, Volcanic forcings, Modern glacier retreat, |
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Abstract |
A global overview of glacier advances and retreats (grouped by regions and by millennia) for the Holocene is compiled from previous studies. The reconstructions of glacier fluctuations are based on 1) mapping and dating moraines defined by 14C, TCN, OSL, lichenometry and tree rings (discontinuous records/time series), and 2) sediments from proglacial lakes and speleothems (continuous records/time series). Using 189 continuous and discontinuous time series, the long-term trends and centennial fluctuations of glaciers were compared to trends in the recession of Northern and mountain tree lines, and with orbital, solar and volcanic studies to examine the likely forcing factors that drove the changes recorded. A general trend of increasing glacier size from the early–mid Holocene, to the late Holocene in the extra-tropical areas of the Northern Hemisphere (NH) is related to overall summer temperature, forced by orbitally-controlled insolation. The glaciers in New Zealand and in the tropical Andes also appear to follow the orbital trend, i.e., they were decreasing from the early Holocene to the present. In contrast, glacier fluctuations in some monsoonal areas of Asia and southern South America generally did not follow the orbital trends, but fluctuated at a higher frequency possibly triggered by distinct teleconnections patterns. During the Neoglacial, advances clustered at 4.4–4.2 ka, 3.8–3.4 ka, 3.3–2.8 ka, 2.6 ka, 2.3–2.1 ka, 1.5–1.4 ka, 1.2–1.0 ka, 0.7–0.5 ka, corresponding to general cooling periods in the North Atlantic. Some of these episodes coincide with multidecadal periods of low solar activity, but it is unclear what mechanism might link small changes in irradiance to widespread glacier fluctuations. Explosive volcanism may have played a role in some periods of glacier advances, such as around 1.7–1.6 ka (coinciding with the Taupo volcanic eruption at 232 ± 5 CE) but the record of explosive volcanism is poorly known through the Holocene. The compilation of ages suggests that there is no single mechanism driving glacier fluctuations on a global scale. Multidecadal variations of solar and volcanic activity supported by positive feedbacks in the climate system may have played a critical role in Holocene glaciation, but further research on such linkages is needed. The rate and the global character of glacier retreat in the 20th through early 21st centuries appears unusual in the context of Holocene glaciation, though the retreating glaciers in most parts of the Northern Hemisphere are still larger today than they were in the early and/or mid-Holocene. The current retreat, however, is occurring during an interval of orbital forcing that is favorable for glacier growth and is therefore caused by a combination of factors other than orbital forcing, primarily strong anthropogenic effects. Glacier retreat will continue into future decades due to the delayed response of glaciers to climate change. |
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1048 |
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0277-3791 |
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yes |
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Serial |
6290 |
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Author |
Denis Mercier, Armelle Decaulne, Emilie Portier, Etienne Cossart |
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Title |
La datation des glissements de terrain paraglaciaires en Islande |
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Poster |
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Year |
2022 |
Publication |
7th conference Climat & impacts, 23-25 novembre 2022, Gif-sur-Yvette, France (hal-03867107) |
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Keywords |
Holocene Climatic Changes Landslides Paraglacial adjustment Rock slope failures |
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Abstract |
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Programme |
1266 |
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yes |
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Call Number |
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8468 |
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Journal Article |
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Year |
2007 |
Publication |
Reviews of geophysics |
Abbreviated Journal |
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45 |
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Keywords |
history; geomagnetism; paleomagnetism; 1599 Geomagnetism and Paleomagnetism: General or miscellaneous; 1714 History of Geophysics: Geomagnetism and paleomagnetism; 5440 Planetary Sciences: Solid Surface Planets: Magnetic fields and magnetism; 7999 Space Weather: General or miscellaneous; 9820 General or Miscellaneous: Techniques applicable in three or more fields |
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Programme |
139 |
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American Geophysical Union |
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ISSN |
8755-1209 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
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5486 |
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Title |
Methods for improving species distribution models in data-poor areas: example of sub-Antarctic benthic species on the Kerguelen Plateau |
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Year |
2018 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
594 |
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149-164 |
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Keywords |
Historical datasets Kerguelen Plateau Model performance Presence-only data Species distribution modeling |
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Abstract |
Species distribution models (SDMs) are essential tools to aid conservation biologists in evaluating the combined effects of environmental change and human activities on natural habitats and for the development of relevant conservation plans. However, modeling species distributions over vast and remote regions is often challenging due to poor and heterogeneous data sets, and this raises questions regarding the relevance of the modeling procedures. In recent years, there have been many methodological developments in SDM procedures using virtual species and broad data sets, but few solutions have been proposed to deal with poor or heterogeneous data. In the present work, we address this methodological challenge by studying the performance of different modeling procedures based on 4 real species, using presence-only data compiled from various oceanographic surveys on the Kerguelen Plateau (Southern Ocean). We followed a practical protocol to test for the reliability and performance of the models and to correct for limited and aggregated data, as well as accounting for spatial and temporal sampling biases. Our results show that producing reliable SDMs is feasible as long as the amount and quality of available data allow testing and correcting for these biases. However, we found that SDMs could be corrected for spatial and temporal heterogeneities in only 1 of the 4 species we examined, highlighting the need to consider all potential biases when modeling species distributions. Finally, we show that model reliability and performance also depend on the interaction between the incompleteness of the data and species niches, with the distribution of narrow-niche species being less sensitive to data gaps than species occupying wider niches. |
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1044 |
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ISSN |
0171-8630, 1616-1599 |
ISBN |
0171-8630, 1616-1599 |
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yes |
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Serial |
7106 |
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Title |
Areas of importance for seabirds tracked from French southern territories, and recommendations for conservation
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Journal Article |
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Year |
2014 |
Publication |
Marine Policy |
Abbreviated Journal |
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Volume |
48 |
Issue |
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Pages |
1-13 |
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Keywords |
High Sea, Key areas, Marine Important Bird Area, Seabirds, Southern Ocean, Tracking, |
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Programme |
109;394 |
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Thesis |
Bachelor's thesis |
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ISSN |
0308-597X |
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yes |
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Serial |
5013 |
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Title |
Modulation of Boundary-Layer Stability and the Surface Energy Budget by a Local Flow in Central Alaska |
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Journal |
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Year |
2022 |
Publication |
Boundary-Layer Meteorology |
Abbreviated Journal |
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Volume |
185 |
Issue |
3 |
Pages |
395-414 |
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Keywords |
High latitude Local flow Surface energy budget Surface temperature inversion Winter |
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Abstract |
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Programme |
1215 |
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ISSN |
1573-1472 |
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yes |
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Call Number |
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Serial |
8501 |
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Journal |
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Year |
2016 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
39 |
Issue |
10 |
Pages |
1689-1698 |
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Keywords |
High Arctic Paraglacial Sedimentary flux Submarine and aerial coastal evolution Svalbard |
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Abstract |
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Programme |
1223 |
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Edition |
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ISSN |
1432-2056 |
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yes |
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Serial |
8768 |
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Title |
New insights into the biomineralization of mercury selenide nanoparticles through stable isotope analysis in giant petrel tissues |
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Journal |
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Year |
2022 |
Publication |
Journal of Hazardous Materials |
Abbreviated Journal |
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Volume |
425 |
Issue |
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Pages |
127922 |
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Keywords |
HgSe nanoparticles Isotopic fractionation MeHg demethylation Mercury Seabirds |
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Abstract |
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Programme |
109 |
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ISSN |
0304-3894 |
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yes |
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Call Number |
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Serial |
8394 |
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