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Author |
Morten Frederiksen, Olivier Gilg, Glenn Yannic |
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Title |
Cross-icecap spring migration confirmed in a high-Arctic seabird, the Ivory Gull Pagophila eburnea |
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Journal |
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Year  |
2021 |
Publication |
Ibis |
Abbreviated Journal |
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Volume |
163 |
Issue |
2 |
Pages |
706-714 |
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Keywords |
ecological barrier Greenland icecap high-altitude migration |
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Abstract |
Seabirds rarely cross major terrestrial barriers during seasonal migration, possibly because they have a limited ability to build up fat stores. For the first time, we tracked two Ivory Gulls with GPS loggers during spring migration from the wintering area in Davis Strait to the breeding colony in north-east Greenland. While one bird migrated in March around the southern tip of Greenland, the other delayed migration until May and crossed the Greenland icecap north of 70°N, covering 1345 km in 29 h. Several aspects of the crossing were noteworthy: the track was remarkably direct, the bird made several stops (totalling 6 h) on the icecap, and the bird increased its flying altitude to nearly 3000 m over West Greenland and > 4000 m over East Greenland. |
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1210 |
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0019-1019 |
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yes |
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6348 |
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Author |
Juan Pedro Rodríguez-López, Brigitte Van Vliet-Lanoë, Jerónimo López-Martínez, Rebeca Martín-García |
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Title |
Scouring by rafted ice and cryogenic patterned ground preserved in a Palaeoproterozoic equatorial proglacial lagoon succession, eastern India, Nuna supercontinent |
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Journal |
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Year |
2021 |
Publication |
Marine and Petroleum Geology |
Abbreviated Journal |
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Volume |
123 |
Issue |
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Pages |
104766 |
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Keywords |
Ice-rafted debris Iceberg scouring India Palaeoproterozoic Permafrost Proglacial Reticulate ice |
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Abstract |
The Chaibasa Formation contains the oldest known record of ploughmarks formed by rafted ice preserved on Earth. The Palaeoproterozoic (Orosirian-Rhyacian, 1.86–2.1 Ga) Chaibasa Formation in the Dhalbhumgarh area, eastern India, represents sedimentation in an ice-contact proglacial lagoon affected by iceberg (bits and growlers) calving and lake-ice rafting. Ice scouring, both on muddy and sandy substrates, as well as ice “rosettes” developed as consequence of the ploughing action of floating icebergs that were moved by wind, meltwater floods and tidal currents on soft sediments. Muddy flats surrounding the proglacial lagoon underwent seasonal deep freezing conditions developing cryogenic patterned ground containing reticulate ice, ice veins and sand wedges, suggesting the occurrence of proglacial permafrost areas coeval with Proterozoic glaciers. The central part of the proglacial lagoon was characterized by deposition of glacial varves punctuated by pebble and cobble size angular dropstones accumulated in the basin as ice-rafted debris from floating ice. Evidences provided in this paper reinforced the idea that 1.86–2.1 Ga ago glacial conditions prevailed after the supposed ending of the Huronian glaciation. This paper provides detailed examples that can be used to recognize possible floating/drifted ice scours in other Precambrian successions, as these elements have largely passed undetected, being probably widely reported in the literature as generic soft-sediment deformation structures. Similar soft-sediment deformations from Precambrian clastic depositional systems should be re-evaluated as there is a significant possibility that most of the Precambrian iceberg-related structures had escape notice, as originally suggested Eyles et al. in 1997. |
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316 |
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0264-8172 |
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yes |
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Serial |
6471 |
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Author |
Karine Delord, Cédric Cotté, Pascal Terray, Charles-André Bost, Henri Weimerskirch, Christophe Barbraud |
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Title |
Factors affecting adult body condition in the endangered northern rockhopper penguin |
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Journal |
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Year |
2021 |
Publication |
Marine Biology |
Abbreviated Journal |
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Volume |
168 |
Issue |
3 |
Pages |
27 |
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Abstract |
Understanding the factors that drive the dynamics of populations of long‐lived species presents a unique challenge for conservation management. Here, we investigated long-term change in the body condition of adult northern rockhopper penguins Eudyptes moseleyi at Amsterdam Island, southern Indian Ocean, which hosts 5–10% of the global population of this endangered species. Analysis of a long‐term dataset (1994–2016), concurrent to the population's rapid decline, revealed no trend in adult northern rockhopper penguin body condition over time at the stages considered in this study, i.e. breeding and moulting. However, body condition varied between years and sexes and part of this variation was explained by environmental factors. Males were on average in better condition than females whatever the stage and individuals on average were in better condition during the moulting compared to the breeding period. The environmental conditions [sea surface temperature anomaly (SSTa), Subtropical Indian Ocean Dipole (SIOD) and Southern Annular Mode (SAM)] appeared to impact non-linearly the body condition. Overall, females were in better condition for negative values of SAM, SIOD and SSTa. The body condition of males exhibited similar but less complex and more significant patterns, with decreasing body condition for increasing SAM, SIOD and SSTa. The absence of long-term trends in male and female body condition suggests that the very low reproductive output and declining population since 1997 is probably not the result of environmental conditions during pre-breeding and pre-moult and necessitates further research into possible drivers during the breeding season. |
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109,394 |
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Thesis |
Bachelor's thesis |
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ISSN |
1432-1793 |
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yes |
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Serial |
7792 |
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Author |
Christophe Barbraud, Baudouin des Monstiers, Adrien Chaigne, Cédric Marteau, Henri Weimerskirch, Karine Delord |
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Title |
Predation by feral cats threatens great albatrosses |
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Journal |
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Year |
2021 |
Publication |
Biological Invasions |
Abbreviated Journal |
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Volume |
23 |
Issue |
8 |
Pages |
2389-2405 |
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Keywords |
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Abstract |
Feral cats (Felis catus) are a potential threat for several seabird species including medium sized albatrosses, but studies documenting predation behavior, demographic impacts and effects of predator control are scarce. Here, we present data on feral cat predation behavior on one of the world’s largest seabirds, the wandering albatross (Diomedea exulans) at Kerguelen Island, and show how it affects breeding success and rate of population growth. We assess the effect of a feral cat control experiment on breeding success and population viability. Using 32 camera traps we monitored 25 nests of albatross and detected 295 events showing a potential predator. Of these, 75.2% and 24.8% involved feral cats and giant petrels, respectively. Giant petrels were never implicated in direct predation. We recorded 17 attacks of feral cats on 13 albatross chicks. Attacks lasted in average 52.1 ± 72.9 min, and resulted in the death of 10 of the 13 (76.9%) monitored chicks. Breeding success where attacks were recorded was low (12%) compared to areas with no attack (86%). Mean breeding success during 3 years before cat control was 26% and increased to 80% during the 3 years following the experiment. According to predation scenarios, population modelling showed that the albatross population would decline by 2.7–4.5% per year without cat control. Following cat control the population would increase at 1.8% per year. Our results demonstrate that feral cats predate and have negative impacts on breeding success and population growth rate of wandering albatrosses at Kerguelen Island. We provide recommendations on feral cat control and eradication to mitigate the risk of population decline or local extinction of large albatrosses. |
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109 |
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ISSN |
1573-1464 |
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yes |
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Serial |
7938 |
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Author |
Ryo Okuwaki, Stephen P. Hicks, Timothy J. Craig, Wenyuan Fan, Saskia Goes, Tim J. Wright, Yuji Yagi |
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Title |
Illuminating a Contorted Slab With a Complex Intraslab Rupture Evolution During the 2021 Mw 7.3 East Cape, New Zealand Earthquake |
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Journal |
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Year |
2021 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
48 |
Issue |
24 |
Pages |
e2021GL095117 |
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Keywords |
earthquake rupture finite-fault inversion Hikurangi intraslab earthquakes slab geometry source imaging |
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Abstract |
The state-of-stress within subducting oceanic plates controls rupture processes of deep intraslab earthquakes. However, little is known about how the large-scale plate geometry and the stress regime relate to the physical nature of the deep intraslab earthquakes. Here we find, by using globally and locally observed seismic records, that the moment magnitude 7.3 2021 East Cape, New Zealand earthquake was driven by a combination of shallow trench-normal extension and unexpectedly, deep trench-parallel compression. We find multiple rupture episodes comprising a mixture of reverse, strike-slip, and normal faulting. Reverse faulting due to the trench-parallel compression is unexpected given the apparent subduction direction, so we require a differential buoyancy-driven stress rotation, which contorts the slab near the edge of the Hikurangi plateau. Our finding highlights that buoyant features in subducting plates may cause diverse rupture behavior of intraslab earthquakes due to the resulting heterogeneous stress state within slabs. |
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Programme |
133 |
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1944-8007 |
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yes |
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8313 |
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Author |
Crouzet N. |
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Title |
Monitoring warm transiting exoplanets for Ariel with ASTEP+ |
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Communication |
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Year |
2021 |
Publication |
Journée Ariel France, 28 janvier 2021 |
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1066 |
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yes |
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7826 |
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Author |
Guillot T. |
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Title |
Science of temperate exoplanets: The lessons from Juno |
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Book Chapter |
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Year |
2021 |
Publication |
Journée Ariel France, 28 janvier 2021 |
Abbreviated Journal |
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1066 |
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Bachelor's thesis |
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yes |
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7827 |
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Author |
Akers P., Savarino, J., Caillon, N. |
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Title |
Reconstructing Antarctic snow accumulation using nitrogen isotopes of nitrate |
Type |
Communication |
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Year |
2021 |
Publication |
EGU General Assembly, 19-30 April 2021 |
Abbreviated Journal |
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1177 |
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yes |
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7866 |
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Author |
Barbero A., Grilli R., Blouzon C., Ahmed S., Thomas J.L., Frey M., Huang Y., Caillon N., Savarino J. |
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Title |
Innovative approach for new estimation of NOx snow-source on the Antarctic Plateau |
Type |
Communication |
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Year |
2021 |
Publication |
EGU General Assembly, 19-30 April 2021 |
Abbreviated Journal |
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1177 |
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yes |
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7867 |
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Author |
Ishino S., Hattori S., Savarino J., Jourdain B., Legrand M., Preunkert S., Alexander B., Yoshida N., Huang J. |
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Title |
Regional characteristics of atmospheric sulfate formation in East Antarctica imprinted on 17O-excess signature |
Type |
Book Chapter |
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Year |
2021 |
Publication |
EGU General Assembly, 19-30 April 2021 |
Abbreviated Journal |
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Programme |
1177 |
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Bachelor's thesis |
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yes |
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Call Number |
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Serial |
7869 |
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