. (2022). A metagenomic insight into the microbiomes of geothermal springs in the Subantarctic Kerguelen Islands (Vol. 12).
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.
Keywords: Computational biology and bioinformatics Ecology Genetics Microbiology
Programme: 1077
|
|
Lengagne T., Lauga J. & Jouventin P. (1997). A method of independent time and frequency decomposition of bioacoustic signals:inter-individual recognition in four species of penguins. C.R. Acad. Sci. Paris, 320, 885–891.
|
|
Chamaille Jammes S., Guinet C., Nicoleau F. & Argentier M. (2000). A method to assess population changes in king penguins: the use of geographical information system to estimate area-population relationships. Polar Biol., 23, 545–549.
|
|
McNamara D E, Hutt C R, Gee L S, Benz H M, Buland R P, . (2009). A Method to Establish Seismic Noise Baselines for Automated Station Assessment
. Seismological Research Letters, 80(4), 628–637.
|
|
Rivolier J., Bachelard C., Cazes G., Gaud R., Le Scanff C., Rosnet E., Novikov M., Gushin V., Efimov V. et al. (1998). A methodological Study in a Space Flight Simulation Context. European review of applied psychology, 48(3), 211–212.
|
. (2020). A Micro-Mechanical Model for the Transformation of Dry Polar Firn Into Ice Using the Level-Set Method (Vol. 8).
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.
Programme: 1153
|
. (2019). A Migratory Divide Among Red-Necked Phalaropes in the Western Palearctic Reveals Contrasting Migration and Wintering Movement Strategies (Vol. 7).
Keywords: Flexibility Itineracy Migration strategy Phalaropus lobatus plasticity Red-necked Phalarope
Programme: 1036
|
. (2019). A miniature biomimetic sonar and movement tag to study the biotic environment and predator-prey interactions in aquatic animals (Vol. 148).
Keywords: Biologging Elephant seal Fisheries sonar Foraging ecology Predator-prey interactions Prey field mapping
Programme: 1201
|
|
Francq C. & Menvielle M. (1996). A model for the am (Km) planetary geomagnetic activity index and application to prediction. Geophysical journal international, 125, 729–746.
|
. (1992). A model of spawn periodicity and population dynamics of Thelepus extensus (Hutchings) (Annelida: Polychaeta) in Kerguelen..
Abstract: Marine Eutrophication and Population Dynamics, Proceedings of the 25th EMBS
Programme: 195
|
