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Maxime Allioux, Stéven Yvenou, Alexander Merkel, Marc Cozannet, Johanne Aubé, Jolann Pommellec, Marc Le Romancer, Véronique Lavastre, Damien Guillaume, Karine Alain |
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Title  |
A metagenomic insight into the microbiomes of geothermal springs in the Subantarctic Kerguelen Islands |
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Journal |
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Year |
2022 |
Publication |
Scientific Reports |
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Volume |
12 |
Issue |
1 |
Pages |
22243 |
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Keywords |
Computational biology and bioinformatics Ecology Genetics Microbiology |
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Abstract |
The Kerguelen Islands, located in the southern part of the Indian Ocean, are very isolated geographically. The microbial diversity and communities present on the island, especially associated to geothermal springs, have never been analyzed with high-throughput sequencing methods. In this article, we performed the first metagenomics analysis of microorganisms present in Kerguelen hot springs. From four hot springs, we assembled metagenomes and recovered 42 metagenome-assembled genomes, mostly associated with new putative taxa based on phylogenomic analyses and overall genome relatedness indices. The 42 MAGs were studied in detail and showed putative affiliations to 13 new genomic species and 6 new genera of Bacteria or Archaea according to GTDB. Functional potential of MAGs suggests the presence of thermophiles and hyperthermophiles, as well as heterotrophs and primary producers possibly involved in the sulfur cycle, notably in the oxidation of sulfur compounds. This paper focused on only four of the dozens of hot springs in the Kerguelen Islands and should be considered as a preliminary study of the microorganisms inhabiting the hot springs of these isolated islands. These results show that more efforts should be made towards characterization of Kerguelen Islands ecosystems, as they represent a reservoir of unknown microbial lineages. |
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1077 |
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2045-2322 |
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yes |
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8558 |
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Lengagne T., Lauga J. & Jouventin P. |
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Title |
A method of independent time and frequency decomposition of bioacoustic signals:inter-individual recognition in four species of penguins. |
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1997 |
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C.R. Acad. Sci. Paris |
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320 |
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885-891 |
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109 |
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yes |
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2028 |
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Chamaille Jammes S., Guinet C., Nicoleau F. & Argentier M. |
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Title |
A method to assess population changes in king penguins: the use of geographical information system to estimate area-population relationships. |
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Journal Article |
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Year |
2000 |
Publication |
Polar biology |
Abbreviated Journal |
Polar Biol. |
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23 |
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545-549 |
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109 |
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0722-4060 |
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yes |
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1582 |
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McNamara D E, Hutt C R, Gee L S, Benz H M, Buland R P, |
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Title |
A Method to Establish Seismic Noise Baselines for Automated Station Assessment
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Journal Article |
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Year |
2009 |
Publication |
Seismological Research Letters |
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80 |
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4 |
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628 -637 |
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133 |
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0895-0695 |
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yes |
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2927 |
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Rivolier J., Bachelard C., Cazes G., Gaud R., Le Scanff C., Rosnet E., Novikov M., Gushin V., Efimov V. et al. |
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Title |
A methodological Study in a Space Flight Simulation Context. |
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Journal Article |
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Year |
1998 |
Publication |
European review of applied psychology |
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Volume |
48(3) |
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211-212 |
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252 |
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yes |
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1972 |
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Author |
Kévin Fourteau, Fabien Gillet-Chaulet, Patricia Martinerie, Xavier Faïn |
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Title |
A Micro-Mechanical Model for the Transformation of Dry Polar Firn Into Ice Using the Level-Set Method |
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Journal |
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Year |
2020 |
Publication |
Frontiers in Earth Science |
Abbreviated Journal |
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Volume |
8 |
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Pages |
101 |
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Abstract |
Interpretation of greenhouse gas records in polar ice cores requires a good understanding of the mechanisms controlling gas trapping in polar ice, and therefore of the processes of densification and pore closure in firn (compacted snow). Current firn densification models are based on a macroscopic description of the firn and rely on empirical laws and/or idealized geometries to obtain the equations governing the densification and pore closure. Here, we propose a physically-based methodology explicitly representing the porous structure and its evolution over time. In order to handle the complex geometry and topological changes that occur during firn densification, we rely on a Level-Set representation of the interface between the ice and the pores. Two mechanisms are considered for the displacement of the interface: (i) mass surface diffusion driven by local pore curvature and (ii) ice dislocation creep. For the latter, ice is modeled as a viscous material and the flow velocities are solutions of the Stokes equations. First applications show that the model is able to densify firn and split pores. Using the model in cold and arid conditions of the Antarctic plateau, we show that gas trapping models do not have to consider the reduced compressibility of closed pores compared to open pores in the deepest part of firns. Our results also suggest that the mechanism of curvature-driven surface diffusion does not result in pore splitting, and that ice creep has to be taken into account for pores to close. Future applications of this type of model could help quantify the evolution and closure of firn porous networks for various accumulation and temperature conditions. |
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1153 |
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2296-6463 |
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yes |
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8268 |
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Rob S. A. van Bemmelen, Yann Kolbeinsson, Raül Ramos, Olivier Gilg, José A. Alves, Malcolm Smith, Hans Schekkerman, Aleksi Lehikoinen, Ib Krag Petersen, Böðvar Þórisson, Aleksandr A. Sokolov, Kaisa Välimäki, Tim van der Meer, J. David Okill, Mark Bolton, Børge Moe, Sveinn Are Hanssen, Loïc Bollache, Aevar Petersen, Sverrir Thorstensen, Jacob González-Solís, Raymond H. G. Klaassen, Ingrid Tulp |
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Title |
A Migratory Divide Among Red-Necked Phalaropes in the Western Palearctic Reveals Contrasting Migration and Wintering Movement Strategies |
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Journal |
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2019 |
Publication |
Frontiers in Ecology and Evolution |
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Volume |
7 |
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Pages |
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Keywords |
Flexibility Itineracy Migration strategy Phalaropus lobatus plasticity Red-necked Phalarope |
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Abstract |
Non-breeding movement strategies of migratory birds may be expected to be flexibly adjusted to the distribution and quality of habitat, but only few studies compare movement strategies between populations using distinct migration routes and wintering areas. In thisour study, individual movement strategies of Rred-necked pPhalaropes Phalaropus lobatus, a long-distance migratory wader using saline waters in the non-breeding period, were studied using light-level geolocators. Results revealed the existence of two populations with distinct migration routes and wintering areas: one breeding in the north-eastern North Atlantic and migrating ca. 10,000 km oversea to the tropical eastern Pacific Ocean and the other breeding in Fennoscandia and Russia migrating ca. 6,000 km – largely over land – to the Arabian Sea (Indian Ocean). In line with our expectations, the transoceanic migration between the North Atlantic and the Pacific was associated with proportionately longer wings, a more even spread of stopovers in autumn and a higher migration speed in spring compared to the migration between Fennoscandian-Russian breeding grounds and the Arabian Sea. In the wintering period, birds wintering in the Pacific were stationaryresided in roughly a singlethe same area, whereas individuals wintering in the Arabian Sea showed individually consistent movementsd extensively between different areas, reflecting differences in spatio-temporal variation in primary productivity between the two wintering areas. Our study is unique in showing how habitat distribution shapes movement strategies over the entire non-breeding period within a species. |
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1036 |
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2296-701X |
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2296-701X |
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yes |
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6953 |
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Author |
Pauline Goulet, Christophe Guinet, René Swift, Peter T. Madsen, Mark Johnson |
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Title |
A miniature biomimetic sonar and movement tag to study the biotic environment and predator-prey interactions in aquatic animals |
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2019 |
Publication |
Deep Sea Research Part I: Oceanographic Research Papers |
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148 |
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1-11 |
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Biologging Elephant seal Fisheries sonar Foraging ecology Predator-prey interactions Prey field mapping |
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Abstract |
How predators find, select and capture prey is central to understanding trophic cascades and ecosystem structure. But despite advances in biologging technology, obtaining in situ observations of organisms and their interactions remains challenging in the marine environment. For some species of toothed whales, echoes from organisms insonified by echolocation clicks and recorded by sound logging tags have provided a fine-scale view of prey density, and predator and prey behaviour during capture attempts, but such information is not available for marine predators that do not echolocate. Here the development and performance of a miniature biomimetic sonar and movement tag capable of acquiring similar data from non-echolocating marine predators is reported. The tag, weighing 200 g in air, records wide bandwidth sonar data at up to 50 pings a second synchronously with fast-sampling sensors for depth, acceleration, magnetic field and GPS. This sensor suite enables biotic conditions and predator behaviour to be related to geographic location over long-duration foraging trips by apex marine predators. The sonar operates at 1.5 MHz with a 3.4° beamwidth and a source level of 190 dB re 1 μPa at 1 m. Sonar recordings from a trial deployment of the tag on a southern elephant seal contained frequent targets corresponding to small organisms up to 6 m ahead of the tagged animal. Synchronously sampled movement data allowed interpretation of whether the seal attempted to capture organisms that it approached closely while the high sonar ping rate revealed attempts by prey to escape. Results from this trial demonstrate the ability of the tag to quantify the biotic environment and to track individual prey captures, providing fine-scale information on predator-prey interactions which has been difficult to obtain from non-echolocating marine animals. |
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1201 |
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0967-0637 |
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8773 |
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Author |
Francq C. & Menvielle M. |
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A model for the am (Km) planetary geomagnetic activity index and application to prediction. |
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1996 |
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Geophysical journal international |
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125 |
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729-746 |
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139 |
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0956-540X |
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yes |
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1332 |
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Duchêne J.C. |
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A model of spawn periodicity and population dynamics of Thelepus extensus (Hutchings) (Annelida: Polychaeta) in Kerguelen. |
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Conference - International - Article with Reading Comitee |
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Year |
1992 |
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Marine Eutrophication and Population Dynamics |
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231-238 |
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Marine Eutrophication and Population Dynamics, Proceedings of the 25th EMBS |
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195 |
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yes |
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1074 |
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