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Author |
Pierrat Benjamin, Saucède Thomas, Festeau Alain, David Bruno, |
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Title |
Antarctic, Sub-Antarctic and cold temperate echinoid database
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Journal Article |
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Year |
2012 |
Publication |
ZOOKEYS |
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Volume |
204 |
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Pages |
47-52 |
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1124 |
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Bachelor's thesis |
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1313-2970 |
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yes |
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Call Number |
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Serial |
4287 |
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Author |
Merieme Chadid, Chris Sneden and George Preston |
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Title |
Spectroscopic Comparison of Metal–Rich RRab Stars of theGalactic Field with Their Metal–Poor Counterparts |
Type |
Journal Article |
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Year |
2016 |
Publication |
Astrophysical journal |
Abbreviated Journal |
Astrophys. J. |
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Volume |
835 |
Issue |
2 |
Pages |
187 |
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Abstract |
We investigate atmospheric properties of 35 stable RRab stars that possess the full ranges of period, light amplitude, and metal abundance found in Galactic RR Lyrae stars. Our results are derived from several thousand echelle spectra obtained over several years with the du Pont telescope of Las Campanas Observatory. Radial velocities of metal lines and the Hα line were used to construct curves of radial velocity versus pulsation phase. From these we estimated radial velocity amplitudes for metal lines (formed near the photosphere) and Hα Doppler cores (formed at small optical depths). We also measured Hα emission fluxes when they appear during primary light rises. Spectra shifted to rest wavelengths, binned into small phase intervals, and co-added were used to perform model atmospheric and abundance analyses. The derived metallicities and those of some previous spectroscopic surveys were combined to produce a new calibration of the Layden abundance scale. We then divided our RRab sample into metal-rich (disk) and metal-poor (halo) groups at [Fe/H] = −1.0; the atmospheres of RRab families, so defined, differ with respect to (a) peak strength of Hα emission flux, (b) Hα radial velocity amplitude, (c) dynamical gravity, (d) stellar radius variation, (e) secondary acceleration during the photometric bump that precedes minimum light, and (f) duration of Hα line-doubling. We also detected Hα line-doubling during the |
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1096 |
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Bachelor's thesis |
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0004-637X |
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yes |
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6544 |
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Author |
L. G. Bouma, J. D. Hartman, R. Brahm, P. Evans, K. A. Collins, G. Zhou, P. Sarkis, S. N. Quinn, J. de Leon, J. Livingston, C. Bergmann, K. G. Stassun, W. Bhatti, J. N. Winn, G. Á Bakos, L. Abe, N. Crouzet, G. Dransfield, T. Guillot, W. Marie-Sainte, D. Mékarnia, A. H. M. J. Triaud, C. G. Tinney, T. Henning, N. Espinoza, A. Jordán, M. Barbieri, S. Nandakumar, T. Trifonov, J. I. Vines, M. Vuckovic, C. Ziegler, N. Law, A. W. Mann, G. R. Ricker, R. Vanderspek, S. Seager, J. M. Jenkins, C. J. Burke, D. Dragomir, A. M. Levine, E. V. Quintana, J. E. Rodriguez, J. C. Smith, B. Wohler |
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Title |
Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602 |
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Journal |
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Year |
2020 |
Publication |
The Astronomical Journal |
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Volume |
160 |
Issue |
5 |
Pages |
239 |
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Keywords |
Astrophysics – Earth and Planetary Astrophysics Astrophysics – Solar and Stellar Astrophysics |
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Abstract |
We report the discovery of TOI 837b and its validation as a transiting planet. We characterize the system using data from the NASA TESS mission, the ESA Gaia mission, ground-based photometry from El Sauce and ASTEP400, and spectroscopy from CHIRON, FEROS, and Veloce. We find that TOI 837 is a $T=9.9$ mag G0/F9 dwarf in the southern open cluster IC 2602. The star and planet are therefore $35^{+11}{-5}$ million years old. Combining the transit photometry with a prior on the stellar parameters derived from the cluster color-magnitude diagram, we find that the planet has an orbital period of $8.3\,{\rm d}$ and is slightly smaller than Jupiter ($R{\rm p} = 0.77^{+0.09}{-0.07} \,R{\rm Jup}$). From radial velocity monitoring, we limit $M{\rm p}\sin i$ to less than 1.20 $M{\rm Jup}$ (3-$\sigma$). The transits either graze or nearly graze the stellar limb. Grazing transits are a cause for concern, as they are often indicative of astrophysical false positive scenarios. Our follow-up data show that such scenarios are unlikely. Our combined multi-color photometry, high-resolution imaging, and radial velocities rule out hierarchical eclipsing binary scenarios. Background eclipsing binary scenarios, though limited by speckle imaging, remain a 0.2% possibility. TOI 837b is therefore a validated adolescent exoplanet. The planetary nature of the system can be confirmed or refuted through observations of the stellar obliquity and the planetary mass. Such observations may also improve our understanding of how the physical and orbital properties of exoplanets change in time. |
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Programme |
1066 |
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Bachelor's thesis |
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ISSN |
1538-3881 |
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yes |
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Call Number |
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Serial |
7804 |
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Author |
Ali Jaffal, Stéphane Betoulle, Sylvie Biagianti-Risbourg, Alexandre Terreau, Wilfried Sanchez, Séverine Paris-Palacios |
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Title |
Heavy metal contamination and hepatic toxicological responses in brown trout (Salmo trutta) from the Kerguelen Islands. |
Type |
Book Chapter |
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Year |
2015 |
Publication |
Polar Research |
Abbreviated Journal |
0800-0395 |
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Volume |
34 |
Issue |
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Pages |
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Keywords |
biomarkers Brown trout fish freshwater liver sub-Antarctic |
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Abstract |
The Kerguelen Islands include various species of freshwater fish such as brown trout (Salmo trutta). These trout are among the most isolated from direct anthropogenic impact worldwide. This study was designed to analyse cadmium (Cd) and copper (Cu) concentrations in the liver of Kerguelen brown trout, and to assess the possible impacts of these metals on hepatic histopathology and oxidative stress parameters (superoxide dismutase and catalase activity and glutathione levels). Trout were caught in the Château River, the Studer Lakes and the Ferme Pond, close to the scientific station of the Kerguelen Islands, corresponding to three morphotypes (river, lake and station). Kerguelen trouts’ hepatic concentrations of Cd and Cur were similar to those reported in previous studies in salmonids populations from areas under anthropological impacts. Clear hepatic disturbances (fibrosis, nuclear alteration, increased immune response, melanomacrophage centres [MMCs]) were observed in all tested trout. A similar histo-pathological trend was observed among the trout from the three morphotypes but anti-oxidative responses were higher in the trout from the “station” morphotype. Hepatic alterations and the presence of MMCs in the livers of Kerguelen brown trout may be related to the high levels of Cd and Cu measured in this fish at all sampling sites. |
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Programme |
409 |
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Bachelor's thesis |
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0800-0395,1751-8369 |
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yes |
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Serial |
6357 |
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Author |
Gutt Julian, Zurell Damaris, Bracegridle Thomas J, Cheung William, Clark Melody S, Convey Peter, Danis Bruno, David Bruno, De Broyer Claude, di Prisco Guido, Griffiths Huw, Laffont Rémi, Peck Lloyd S, Pierrat Benjamin, Riddle Martin J, Saucède Thomas, Turner John, Verde Cinzia, Wang Zhaomin, Grimm Volker, |
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Title |
Correlative and dynamic species distribution modelling for ecological predictions in the Antarctic: a cross-disciplinary concept
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Type |
Journal Article |
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Year |
2012 |
Publication |
POLAR RESEARCH |
Abbreviated Journal |
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Volume |
31 |
Issue |
110091 |
Pages |
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Abstract |
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Programme |
1044 |
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Bachelor's thesis |
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ISSN |
0800-0395 |
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yes |
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Call Number |
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Serial |
4240 |
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Author |
Gutt Julian, Zurell Damaris, Bracegridle Thomas J, Cheung William, Clark Melody S, Convey Peter, Danis Bruno, David Bruno, De Broyer Claude, di Prisco Guido, Griffiths Huw, Laffont Rémi, Peck Lloyd S, Pierrat Benjamin, Riddle Martin J, Saucède Thomas, Turner John, Verde Cinzia, Wang Zhaomin, Grimm Volker, |
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Title |
Correlative and dynamic species distribution modelling for ecological predictions in the Antarctic: a cross-disciplinary concept
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Type |
Journal Article |
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Year |
2012 |
Publication |
POLAR RESEARCH |
Abbreviated Journal |
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Volume |
31 |
Issue |
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Pages |
110091 |
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Abstract |
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Programme |
1124 |
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Thesis |
Bachelor's thesis |
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ISSN |
0800-0395 |
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yes |
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Call Number |
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Serial |
4290 |
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Author |
Alexander Kokhanovsky, Maxim Lamare, Olaf Danne, Carsten Brockmann, Marie Dumont, Ghislain Picard, Laurent Arnaud, Vincent Favier, Bruno Jourdain, Emmanuel Le Meur, Biagio Di Mauro, Teruo Aoki, Masashi Niwano, Vladimir Rozanov, Sergey Korkin, Sepp Kipfstuhl, Johannes Freitag, Maria Hoerhold, Alexandra Zuhr, Diana Vladimirova, Anne-Katrine Faber, Hans Christian Steen-Larsen, Sonja Wahl, Jonas K. Andersen, Baptiste Vandecrux, Dirk van As, Kenneth D. Mankoff, Michael Kern, Eleonora Zege, Jason E. Box |
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Title |
Retrieval of snow properties from the Sentinel-3 Ocean and Land Colour Instrument |
Type |
Journal |
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Year |
2019 |
Publication |
Remote Sensing |
Abbreviated Journal |
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Volume |
11 |
Issue |
19 |
Pages |
2280 |
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Keywords |
albedo OLCI optical remote sensing Sentinel 3 snow characteristics sow grain size specific surface area |
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Abstract |
The Sentinel Application Platform (SNAP) architecture facilitates Earth Observation data processing. In this work, we present results from a new Snow Processor for SNAP. We also describe physical principles behind the developed snow property retrieval technique based on the analysis of Ocean and Land Colour Instrument (OLCI) onboard Sentinel-3A/B measurements over clean and polluted snow fields. Using OLCI spectral reflectance measurements in the range 400–1020 nm, we derived important snow properties such as spectral and broadband albedo, snow specific surface area, snow extent and grain size on a spatial grid of 300 m. The algorithm also incorporated cloud screening and atmospheric correction procedures over snow surfaces. We present validation results using ground measurements from Antarctica, the Greenland ice sheet and the French Alps. We find the spectral albedo retrieved with accuracy of better than 3% on average, making our retrievals sufficient for a variety of applications. Broadband albedo is retrieved with the average accuracy of about 5% over snow. Therefore, the uncertainties of satellite retrievals are close to experimental errors of ground measurements. The retrieved surface grain size shows good agreement with ground observations. Snow specific surface area observations are also consistent with our OLCI retrievals. We present snow albedo and grain size mapping over the inland ice sheet of Greenland for areas including dry snow, melted/melting snow and impurity rich bare ice. The algorithm can be applied to OLCI Sentinel-3 measurements providing an opportunity for creation of long-term snow property records essential for climate monitoring and data assimilation studies—especially in the Arctic region, where we face rapid environmental changes including reduction of snow/ice extent and, therefore, planetary albedo. |
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Programme |
1110 |
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Thesis |
Bachelor's thesis |
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Approved |
yes |
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Call Number |
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Serial |
7487 |
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Author |
Bastien Labarrere, Andreas Prinzing, Thomas Dorey, Emeline Chesneau, Françoise Hennion |
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Title |
Variations of Secondary Metabolites among Natural Populations of Sub-Antarctic Ranunculus Species Suggest Functional Redundancy and Versatility |
Type |
Journal |
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Year |
2019 |
Publication |
Plants |
Abbreviated Journal |
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Volume |
8 |
Issue |
7 |
Pages |
234 |
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Keywords |
Ranunculus biternatus Ranunculus moseleyi Ranunculus pseudotrullifolius amines environment natural populations quercetins redundancy secondary metabolite variation sub-Antarctic plants |
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Abstract |
Plants produce a high diversity of metabolites which help them sustain environmental stresses and are involved in local adaptation. However, shaped by both the genome and the environment, the patterns of variation of the metabolome in nature are difficult to decipher. Few studies have explored the relative parts of geographical region versus environment or phenotype in metabolomic variability within species and none have discussed a possible effect of the region on the correlations between metabolites and environments or phenotypes. In three sub-Antarctic Ranunculus species, we examined the role of region in metabolite differences and in the relationship between individual compounds and environmental conditions or phenotypic traits. Populations of three Ranunculus species were sampled across similar environmental gradients in two distinct geographical regions in îles Kerguelen. Two metabolite classes were studied, amines (quantified by high-performance liquid chromatography and fluorescence spectrophotometry) and flavonols (quantified by ultra-high-performance liquid chromatography with triple quadrupole mass spectrometry). Depending on regions, the same environment or the same trait may be related to different metabolites, suggesting metabolite redundancy within species. In several cases, a given metabolite showed different or even opposite relations with the same environmental condition or the same trait across the two regions, suggesting metabolite versatility within species. Our results suggest that metabolites may be functionally redundant and versatile within species, both in their response to environments and in their relation with the phenotype. These findings open new perspectives for understanding evolutionary responses of plants to environmental changes. |
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Programme |
136,1116 |
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Bachelor's thesis |
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yes |
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Serial |
7724 |
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Author |
David Renault |
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Title |
A Review of the Phenotypic Traits Associated with Insect Dispersal Polymorphism, and Experimental Designs for Sorting out Resident and Disperser Phenotypes |
Type |
Journal |
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Year |
2020 |
Publication |
Insects |
Abbreviated Journal |
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Volume |
11 |
Issue |
4 |
Pages |
214 |
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Keywords |
fecundity hostile matrix life-history mating morphology movement range expansion reproduction wing-dimorphic wing-monomorphic |
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Abstract |
Dispersal represents a key life-history trait with several implications for the fitness of organisms, population dynamics and resilience, local adaptation, meta-population dynamics, range shifting, and biological invasions. Plastic and evolutionary changes of dispersal traits have been intensively studied over the past decades in entomology, in particular in wing-dimorphic insects for which literature reviews are available. Importantly, dispersal polymorphism also exists in wing-monomorphic and wingless insects, and except for butterflies, fewer syntheses are available. In this perspective, by integrating the very latest research in the fast moving field of insect dispersal ecology, this review article provides an overview of our current knowledge of dispersal polymorphism in insects. In a first part, some of the most often used experimental methodologies for the separation of dispersers and residents in wing-monomorphic and wingless insects are presented. Then, the existing knowledge on the morphological and life-history trait differences between resident and disperser phenotypes is synthetized. In a last part, the effects of range expansion on dispersal traits and performance is examined, in particular for insects from range edges and invasion fronts. Finally, some research perspectives are proposed in the last part of the review. |
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Programme |
136 |
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Bachelor's thesis |
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yes |
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Serial |
7656 |
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Author |
Larose Catherine, Dommergue Aurélien, Vogel Timothy M, |
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Title |
The Dynamic Arctic Snow Pack: An Unexplored Environment for Microbial Diversity and Activity
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Type |
Journal Article |
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Year |
2013 |
Publication |
biology |
Abbreviated Journal |
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Volume |
2 |
Issue |
1 |
Pages |
317-330 |
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Keywords |
biogeochemical cycling, microbial ecology, snow, Arctic, |
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Abstract |
The Arctic environment is undergoing changes due to climate shifts, receiving contaminants from distant sources and experiencing increased human activity. Climate change may alter microbial functioning by increasing growth rates and substrate use due to increased temperature. This may lead to changes of process rates and shifts in the structure of microbial communities. Biodiversity may increase as the Arctic warms and population shifts occur as psychrophilic/psychrotolerant species disappear in favor of more mesophylic ones. In order to predict how ecological processes will evolve as a function of global change, it is essential to identify which populations participate in each process, how they vary physiologically, and how the relative abundance, activity and community structure will change under altered environmental conditions. This review covers aspects of the importance and implication of snowpack in microbial ecology emphasizing the diversity and activity of these critical members of cold zone ecosystems. |
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Programme |
399 |
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Bachelor's thesis |
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ISSN |
2079-7737 |
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yes |
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Call Number |
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Serial |
4375 |
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