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Author |
Kenta Ohara, Yuji Yagi, Shinji Yamashita, Ryo Okuwaki, Shiro Hirano, Yukitoshi Fukahata |
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Title |
Complex evolution of the 2016 Kaikoura earthquake revealed by teleseismic body waves |
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Journal |
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Year  |
2023 |
Publication |
Progress in Earth and Planetary Science |
Abbreviated Journal |
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Volume |
10 |
Issue |
1 |
Pages |
35 |
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Keywords |
Body waves Earthquake dynamics Earthquake source observation Waveform inversion |
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133 |
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2197-4284 |
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yes |
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8531 |
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Title |
Cephalopod prey of light-mantled sooty albatross Phoebetria palpebrata, resource partitioning amongst Kerguelen albatrosses, and teuthofauna of the southern Indian Ocean |
Type |
Journal |
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Year |
2023 |
Publication |
Deep Sea Research Part I: Oceanographic Research Papers |
Abbreviated Journal |
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Volume |
198 |
Issue |
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Pages |
104082 |
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Keywords |
Antarctica Bio-indication Procellariiformes Seabirds Southern Ocean Squids Stable isotopes |
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Abstract |
The cephalopod diet of the light-mantled sooty albatross Phoebetria palpebrata was determined for the first time at the subantarctic Kerguelen Islands by sorting ?7000 accumulated beaks from 66 regurgitated boluses. Twenty-two taxa were identified, including four dominant squid species that are all endemic to the Southern Ocean: Galiteuthis glacialis (49.8% of the lower beaks) Psychroteuthis glacialis (18.5%), Martialia hyadesi (16.2%) and Moroteuthopsis longimana (6.9%). Beak ?13C values indicated that all adult P. glacialis, almost all juvenile M. longimana, and most adult G. glacialis were caught in Antarctic waters, while albatrosses preyed upon juvenile M. hyadesi in subantarctic waters. Comparative analysis of lower beaks accumulated in food samples of Kerguelen albatrosses showed that the four main sympatric albatross species segregate primarily by species-specific foraging grounds. Light-mantled sooty albatross feed on the Antarctic P. glacialis, wandering albatross Diomedea exulans on subantarctic and subtropical histioteuthids (41.4%), and grey-headed albatross Thalassarche chrysostoma and black-browed albatross T. melanophris on subantarctic ommastrephids (69.3% and 65.7%, respectively), with black-browed albatross also preying upon neritic endemic octopuses (17.6%). Cephalopod prey of Kerguelen albatrosses highlight the abundance and importance of some squids in the functioning of the pelagic ecosystem of the southern Indian Ocean, such as ommastrephids, M. longimana, P. glacialis, Histioteuthis atlantica, H. eltaninae, and G. glacialis. Based on the diet of the light-mantled sooty albatross, P. glacialis appears common in high-Antarctic waters of the southern Indian Ocean, whereas the poorly known Psychroteuthis sp. B (Imber) is evidently present in Antarctic waters south of the Kerguelen Islands. |
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Programme |
109 |
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ISSN |
0967-0637 |
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yes |
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Serial |
8532 |
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Title |
Demographic responses of Arctic seabirds to spring sea-ice variations |
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Journal |
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Year |
2023 |
Publication |
Frontiers in Ecology and Evolution |
Abbreviated Journal |
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Volume |
11 |
Issue |
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Programme |
330 |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2296-701X |
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yes |
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Serial |
8533 |
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Title |
Does contaminant exposure disrupt maternal hormones deposition? A study on per- and polyfluoroalkyl substances in an Arctic seabird |
Type |
Journal |
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Year |
2023 |
Publication |
Science of The Total Environment |
Abbreviated Journal |
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Volume |
868 |
Issue |
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Pages |
161413 |
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Keywords |
Black-legged kittiwake Corticosterone Maternal effect PFAS Testosterone Thyroid hormones |
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Abstract |
Maternal effects are thought to be essential tools for females to modulate offspring development. The selective deposition of avian maternal hormones could therefore allow females to strategically adjust the phenotype of their offspring to the environmental situation encountered. However, at the time of egg formation, several contaminants are also transferred to the egg, including per- and polyfluoroalkyl substances (PFAS) which are ubiquitous organic contaminants with endocrine disrupting properties. It is, however, unknown if they can disrupt maternal hormone deposition. In this study we explored relationships between female PFAS burden and maternal deposition in the eggs of steroids (dihydrotestosterone, androstenedione and testosterone), glucocorticoids (corticosterone) and thyroid hormones (triiodothyronine and thyroxine) in a population of the Arctic-breeding black-legged kittiwake (Rissa tridactyla). Egg yolk hormone levels were unrelated to female hormone plasma levels. Second-laid eggs had significantly lower concentrations of androstenedione than first-laid eggs. Triiodothyronine yolk levels were decreasing with increasing egg mass but increasing with increasing females' body condition. Testosterone was the only transferred yolk hormone correlated to maternal PFAS burden: specifically, we found a positive correlation between testosterone in yolks and circulating maternal perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDcA) and perfluoroundecanoic acid (PFUnA) in first-laid eggs. This correlative study provides a first insight into the potential of some long-chain perfluoroalkyl acids to disrupt maternal hormones deposition in eggs and raises the question about the consequences of increased testosterone deposition on the developing embryo. |
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330 |
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Edition |
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ISSN |
0048-9697 |
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yes |
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Call Number |
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Serial |
8534 |
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Author |
Joris Laborie, Matthieu Authier, Adrien Chaigne, Karine Delord, Henri Weimerskirch, Christophe Guinet |
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Title |
Estimation of total population size of southern elephant seals (Mirounga leonina) on Kerguelen and Crozet Archipelagos using very high-resolution satellite imagery |
Type |
Journal |
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Year |
2023 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
10 |
Issue |
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Pages |
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Keywords |
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Abstract |
Southern elephant seals (Mirounga leonina) play a pivotal role in the Southern Ocean as wide-ranging marine predators and major prey consumers within Southern Ocean marine ecosystems. Due to their circumpolar distribution and the remoteness of their habitat, large uncertainties remain about their total population sizes. This is especially true for elephant seal populations in the French Southern Territories in the southern Indian Ocean (i.e. Crozet and Kerguelen Archipelagos) as many breeding sites are inaccessible for ground censuses. Here, we present a simple and efficient approach for estimating the total elephant seal populations of the Kerguelen and Crozet Archipelagos by using very high-resolution satellite imagery (<1m resolution). Twenty-eight satellite images taken during the breeding season to count female elephant seals in inaccessible areas were used and complemented the traditional annual ground counts in accessible areas. For Kerguelen Island sectors likely to host colonies and where no satellite images were available for the breeding season, a statistical predictive model was built to estimate the most likely number of breeding females to be present on a given beach according to its physiographic characteristics. Our results show the reliability of using very high-resolution satellite images, a relatively low-cost platform, to count pinniped populations and provide the first estimation of the total southern elephant seal population for both the Kerguelen 347,995 (s e = 4,950) and Crozet 13,065 (s e = 169) Archipelagos. The combined total represents over 35% of the global elephant seal population with the Kerguelen stock being numerically equivalent to the South Georgia stock. In addition, we re-examined the population trends since the last mid-century for Kerguelen and over the last five decades for Crozet. The demographic trends of the southern Indian Ocean populations show marked growth over the last decade (5.1% and 1.6% annual growth rate for Crozet and Kerguelen respectively), particularly on Crozet where the elephant seal population has more than tripled. |
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Programme |
109,1201 |
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Thesis |
Bachelor's thesis |
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Series Issue |
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Edition |
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ISSN |
2296-7745 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8535 |
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Author |
Charlotte Bruland, Celine Hadziioannou |
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Title |
Gliding tremors associated with the 26 second microseism in the Gulf of Guinea |
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Journal |
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Year |
2023 |
Publication |
Communications Earth & Environment |
Abbreviated Journal |
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Volume |
4 |
Issue |
1 |
Pages |
1-9 |
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Keywords |
Geophysics Seismology Volcanology |
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Abstract |
A location in the Gulf of Guinea, which emits monochromatic seismic waves at 26-second period, seemingly continuously, was identified in the 1960s. However, the origin of these seismic waves remains enigmatic to date. Here we use three-component data from two seismic arrays in Africa, as well as additional seismic data compiled from around the world, to investigate the tremors. We identify frequency glides accompanying the previously known 26 s microseism which start at the same frequency and originate in the same, fixed location in the Gulf of Guinea. The stable characteristics of the tremors, their low frequency range, the implied large spatial scale, and the decades-long timescales where this phenomenon seems to have been active, all point towards a gap in our understanding of long period oceanic and volcanic signals. Since tremor is an important tool to monitor volcanoes, understanding this phenomenon may affect future forecasting of volcanic activity. |
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Programme |
133 |
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ISSN |
2662-4435 |
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Approved |
yes |
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Call Number |
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Serial |
8536 |
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Title |
Ground-Based Oblique-View Photogrammetry and Sentinel-1 Spaceborne RADAR Reflectivity Snow Melt Processes Assessment on an Arctic Glacier |
Type |
Journal |
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Year |
2023 |
Publication |
Remote Sensing |
Abbreviated Journal |
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Volume |
15 |
Issue |
7 |
Pages |
1858 |
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Keywords |
arctic cold region hydrology melting processes Sentinel-1 snowpack properties |
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Abstract |
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Programme |
1108 |
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ISSN |
2072-4292 |
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yes |
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Serial |
8537 |
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Author |
Juliet Lamb, Jeremy Tornos, Romain Dedet, Hubert Gantelet, Nicolas Keck, Juliette Baron, Marine Bely, Augustin Clessin, Aline Flechet, Amandine Gamble, Thierry Boulinier |
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Title |
Hanging out at the club: Breeding status and territoriality affect individual space use, multi-species overlap and pathogen transmission risk at a seabird colony |
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Journal |
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Year |
2023 |
Publication |
Functional Ecology |
Abbreviated Journal |
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Volume |
37 |
Issue |
3 |
Pages |
576-590 |
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Keywords |
Diomedea amsterdamensis dynamic space utilization floaters foraging infectious disease nonbreeding Stercorarius antarcticus |
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Abstract |
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Programme |
1151 |
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ISSN |
1365-2435 |
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yes |
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Serial |
8538 |
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Author |
Concepcion Sanchez-Cid, Christoph Keuschnig, Timothy M Vogel, Catherine Larose |
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Title |
Impact of in situ solar irradiation on snow bacterial communities and functional potential |
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Journal |
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Year |
2023 |
Publication |
FEMS Microbiology Ecology |
Abbreviated Journal |
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Volume |
99 |
Issue |
6 |
Pages |
fiad042 |
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Programme |
1192 |
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ISSN |
0168-6496 |
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yes |
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Serial |
8539 |
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Title |
Improved accuracy and spatial resolution for bio-logging-derived chlorophyll a fluorescence measurements in the Southern Ocean |
Type |
Journal |
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Year |
2023 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
10 |
Issue |
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Pages |
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Keywords |
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Abstract |
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Programme |
109 |
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ISSN |
2296-7745 |
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yes |
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Call Number |
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Serial |
8540 |
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