| Records |
Author  |
Alexander L. Bond, Christopher Taylor, David Kinchin-Smith, Derren Fox, Emma Witcutt, Peter G. Ryan, Simon P. Loader, Henri Weimerskirch |
| Title |
A juvenile Tristan albatross (Diomedea dabbenena) on land at the Crozet Islands |
Type |
Journal |
| Year |
2021 |
Publication |
Polar Biology |
Abbreviated Journal |
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| Volume |
44 |
Issue |
1 |
Pages |
229-233 |
| Keywords |
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| Abstract |
Albatrosses and other seabirds are generally highly philopatric, returning to natal colonies when they achieve breeding age. This is not universal, however, and cases of extraordinary vagrancy are rare. The Tristan Albatross (Diomedea dabbenena) breeds on Gough Island in the South Atlantic Ocean, with a small population on Inaccessible Island, Tristan da Cunha, ca 380 km away. In 2015, we observed an adult male albatross in Gonydale, Gough Island, which had been ringed on Ile de la Possession, Crozet Islands in 2009 when it was assumed to be an immature Wandering Albatross (D. exulans). We sequenced 1109 bp of the cytochrome b mitochondrial gene from this bird, and confirmed it to be a Tristan Albatross, meaning its presence on Crozet 6 years previous, and nearly 5000 km away, was a case of prospecting behaviour in a heterospecific colony. Given the challenges in identifying immature Diomedea albatrosses, such dispersal events may be more common than thought previously. |
| Programme |
109 |
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| Series Editor |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1432-2056 |
ISBN |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8083 |
| Permanent link to this record |
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| Author |
Alexander Kokhanovsky, Simon Gascoin, Laurent Arnaud, Ghislain Picard |
| Title |
Retrieval of Snow Albedo and Total Ozone Column from Single-View MSI/S-2 Spectral Reflectance Measurements over Antarctica |
Type |
Journal |
| Year |
2021 |
Publication |
Remote Sensing |
Abbreviated Journal |
|
| Volume |
13 |
Issue |
21 |
Pages |
4404 |
| Keywords |
albedo inverse problems light scattering radiative transfer snow snow grain size |
| Abstract |
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| Programme |
1110 |
| Campaign |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2072-4292 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8305 |
| Permanent link to this record |
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| Author |
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| Title |
Fine-scale structures as spots of increased fish concentration in the open ocean |
Type |
Journal |
| Year |
2021 |
Publication |
Scientific Reports |
Abbreviated Journal |
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| Volume |
11 |
Issue |
1 |
Pages |
15805 |
| Keywords |
Fisheries Marine biology Physical oceanography |
| Abstract |
Oceanic frontal zones have been shown to deeply influence the distribution of primary producers and, at the other extreme of the trophic web, top predators. However, the relationship between these structures and intermediate trophic levels is much more obscure. In this paper we address this knowledge gap by comparing acoustic measurements of mesopelagic fish concentrations to satellite-derived fine-scale Lagrangian Coherent Structures in the Indian sector of the Southern Ocean. First, we demonstrate that higher fish concentrations occur more frequently in correspondence with strong Lagrangian Coherent Structures. Secondly, we illustrate that, while increased fish densities are more likely to be observed over these structures, the presence of a fine-scale feature does not imply a concomitant fish accumulation, as other factors affect fish distribution. Thirdly, we show that, when only chlorophyll-rich waters are considered, front intensity modulates significantly more the local fish concentration. Finally, we discuss a model representing fish movement along Lagrangian features, specifically built for mid-trophic levels. Its results, obtained with realistic parameters, are qualitatively consistent with the observations and the spatio-temporal scales analysed. Overall, these findings may help to integrate intermediate trophic levels in trophic models, which can ultimately support management and conservation policies. |
| Programme |
109 |
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Edition |
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| ISSN |
2045-2322 |
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Expedition |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8384 |
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| Author |
Albertin, S., Savarino, J., Bekki, S., T. Roberts, T., Barret, B., Mao, J., Simpson, W., Law, K. |
| Title |
Isotopic constraints on the sources and fate of atmospheric nitrate in Fairbanks, Alaska: preliminary results of the pre-ALPACA campaign |
Type |
Communication |
| Year |
2021 |
Publication |
Paces meeting, may 2021 |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
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| Abstract |
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| Programme |
1215 |
| Campaign |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8513 |
| Permanent link to this record |
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| Author |
Alain Royer, Florent Domine, Alexandre Roy, Alexandre Langlois, Nicolas Marchand, Gautier Davesne |
| Title |
New northern snowpack classification linked to vegetation cover on a latitudinal mega-transect across northeastern Canada |
Type |
Journal |
| Year |
2021 |
Publication |
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Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
1-18 |
| Keywords |
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| Abstract |
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| Programme |
1042 |
| Campaign |
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| Series Editor |
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Series Title |
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Series Issue |
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Edition |
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| ISSN |
1195-6860 |
ISBN |
1195-6860 |
Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7971 |
| Permanent link to this record |
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| Author |
Alain Manceau, Romain Brossier, Sarah E. Janssen, Tylor J. Rosera, David P. Krabbenhoft, Yves Cherel, Paco Bustamante, Brett A. Poulin |
| Title |
Mercury Isotope Fractionation by Internal Demethylation and Biomineralization Reactions in Seabirds: Implications for Environmental Mercury Science |
Type |
Journal |
| Year |
2021 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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| Volume |
55 |
Issue |
20 |
Pages |
13942-13952 |
| Keywords |
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| Abstract |
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| Programme |
109 |
| Campaign |
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| Address |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0013-936X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8427 |
| Permanent link to this record |
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| Author |
Alain Manceau, Anne-Claire Gaillot, Pieter Glatzel, Yves Cherel, Paco Bustamante |
| Title |
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Type |
Journal |
| Year |
2021 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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| Volume |
55 |
Issue |
3 |
Pages |
1515-1526 |
| Keywords |
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| Abstract |
In vivo and in vitro evidence for detoxification of methylmercury (MeHg) as insoluble mercury selenide (HgSe) underlies the central paradigm that mercury exposure is not or little hazardous when tissue Se is in molar excess (Se:Hg > 1). However, this hypothesis overlooks the binding of Hg to selenoproteins, which lowers the amount of bioavailable Se that acts as a detoxification reservoir for MeHg, thereby underestimating the toxicity of mercury. This question was addressed by determining the chemical forms of Hg in various tissues of giant petrels Macronectes spp. using a combination of high energy-resolution X-ray absorption near edge structure and extended X-ray absorption fine structure spectroscopy, and transmission electron microscopy coupled to elemental mapping. Three main Hg species were identified, a MeHg-cysteinate complex, a four-coordinate selenocysteinate complex (Hg(Sec)4), and a HgSe precipitate, together with a minor dicysteinate complex Hg(Cys)2. The amount of HgSe decreases in the order liver > kidneys > brain = muscle, and the amount of Hg(Sec)4 in the order muscle > kidneys > brain > liver. On the basis of biochemical considerations and structural modeling, we hypothesize that Hg(Sec)4 is bound to the carboxy-terminus domain of selenoprotein P (SelP) which contains 12 Sec residues. Structural flexibility allows SelP to form multinuclear Hgx(Se,Sec)y complexes, which can be biomineralized to HgSe by protein self-assembly. Because Hg(Sec)4 has a Se:Hg molar ratio of 4:1, this species severely depletes the stock of bioavailable Se for selenoprotein synthesis and activity to one ?g Se/g dry wet in the muscle of several birds. This concentration is still relatively high because selenium is naturally abundant in seawater, therefore it probably does not fall below the metabolic need for essential selenium. However, this study shows that this may not be the case for terrestrial animals, and that muscle may be the first tissue potentially injured by Hg toxicity. |
| Programme |
109 |
| Campaign |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0013-936X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7942 |
| Permanent link to this record |
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| Author |
Akers P., Savarino, J., Caillon, N. |
| Title |
Reconstructing Antarctic snow accumulation using nitrogen isotopes of nitrate |
Type |
Communication |
| Year |
2021 |
Publication |
EGU General Assembly, 19-30 April 2021 |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
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| Abstract |
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| Programme |
1177 |
| Campaign |
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| Address |
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Thesis |
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Editor |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7866 |
| Permanent link to this record |
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| Author |
Afsaneh Mohammadzaheri, Karin Sigloch, Kasra Hosseini, Mitchell G. Mihalynuk |
| Title |
Subducted Lithosphere Under South America From Multifrequency P Wave Tomography |
Type |
Journal |
| Year |
2021 |
Publication |
Journal of Geophysical Research: Solid Earth |
Abbreviated Journal |
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| Volume |
126 |
Issue |
6 |
Pages |
e2020JB020704 |
| Keywords |
Andes intra-arc intra-oceanic subduction seismic tomography South America structure of the mantel |
| Abstract |
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| Programme |
133 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2169-9356 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7991 |
| Permanent link to this record |
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| Author |
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| Title |
Diel at-sea activity of two species of great albatrosses: the ontogeny of foraging and movement behaviour |
Type |
Journal |
| Year |
2021 |
Publication |
Journal of Avian Biology |
Abbreviated Journal |
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| Volume |
52 |
Issue |
2 |
Pages |
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| Keywords |
albatross diel activity pattern Diomedea flight behavior foraging activity moon illumination night activity seabirds |
| Abstract |
The first year of life is a period of high mortality in animals. Reduced foraging capacities of naive individuals might be the primary cause of their mortality. These capacities are supposed to be progressively acquired during the first months of life. In this study, we investigate the ontogeny of flight capacities, by day and night, of first-year individuals, and compare it with adults from two closely related species of great albatrosses: Amsterdam Diomedea amsterdamensis and wandering Diomedea exulans albatrosses which forage in different environmental conditions. We used 71 tracks of 71 juvenile birds and 141 of 116 incubating adults to compare both age categories. In order to explore the effect of moon light on night activity, we elaborated a new formula which improves the precision of the proxy of moon illumination. By day, we found that juveniles of both species reach some adult foraging capacities in less than two months. By night, albatrosses have reduced activity increasing during the first weeks at sea for juveniles and changing in accordance with moon illumination for both juveniles and adults. A peak of flight activity at dawn and dusk was apparent for both species. Interspecific comparison underlined that Amsterdam albatrosses were more active than wandering albatrosses, suggesting a difference in food and foraging strategy. Overall, we highlighted how life history traits, environmental conditions and time of the day affect the foraging activity of two related species of seabirds. |
| Programme |
109 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1600-048X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7943 |
| Permanent link to this record |
