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Author  |
Zaroli C, Sambridge M, Lévêque J-J, Debayle E, Nolet G, |
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Title |
An objective rationale for the choice of regularisation parameter with application to global multiple-frequency S-wave tomography
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Journal Article |
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Year |
2013 |
Publication |
Solid Earth |
Abbreviated Journal |
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Volume |
4 |
Issue |
2 |
Pages |
357-371 |
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133, 906 |
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Bachelor's thesis |
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1869-9529 |
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yes |
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4359 |
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Author |
Zambra López-Farrán, Charlène Guillaumot, Luis Vargas-Chacoff, Kurt Paschke, Valérie Dulière, Bruno Danis, Elie Poulin, Thomas Saucède, Jonathan Waters, Karin Gérard |
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Title |
Is the southern crab Halicarcinus planatus (Fabricius, 1775) the next invader of Antarctica? |
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Journal |
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Year |
2021 |
Publication |
Global Change Biology |
Abbreviated Journal |
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Volume |
27 |
Issue |
15 |
Pages |
3487-3504 |
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Keywords |
climate change establishment niche modelling non-native species reptant crab Southern Ocean survival thermotolerance |
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Abstract |
The potential for biological colonization of Antarctic shores is an increasingly important topic in the context of anthropogenic warming. Successful Antarctic invasions to date have been recorded exclusively from terrestrial habitats. While non-native marine species such as crabs, mussels and tunicates have already been reported from Antarctic coasts, none have as yet established there. Among the potential marine invaders of Antarctic shallow waters is Halicarcinus planatus (Fabricius, 1775), a crab with a circum-Subantarctic distribution and substantial larval dispersal capacity. An ovigerous female of this species was found in shallow waters of Deception Island, South Shetland Islands in 2010. A combination of physiological experiments and ecological modelling was used to assess the potential niche of H. planatus and estimate its future southward boundaries under climate change scenarios. We show that H. planatus has a minimum thermal limit of 1°C, and that its current distribution (assessed by sampling and niche modelling) is physiologically restricted to the Subantarctic region. While this species is presently unable to survive in Antarctica, future warming under both ‘strong mitigation’ and ‘no mitigation’ greenhouse gas emission scenarios will favour its niche expansion to the Western Antarctic Peninsula (WAP) by 2100. Future human activity also has potential to increase the probability of anthropogenic translocation of this species into Antarctic ecosystems. |
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1044 |
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1365-2486 |
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yes |
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8005 |
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Author |
ZalianCyrus, ChadidMerieme, |
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Title |
Antarctica photometric survey using PDM13
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Type |
Conference - International - Article with Reading Comitee |
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Year |
2013 |
Publication |
Proceedings of the International Astronomical Union |
Abbreviated Journal |
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Volume |
9 |
Issue |
Symposium S301 |
Pages |
511-512 |
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Keywords |
Frequency analysis, phase dispersion minimization, graphical interface, Antarctica photometric survey, |
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Abstract |
PDM13 is a new graphic interface program dedicated to frequency domain analysis based on the Phase Dispersion Minimization technique (PDM, Stellingwerf 2012). In this paper, we will present the different algorithms running in PDM13, including the Auto-Segmentation, the Gauss-Newton and the PDM algorithms. More details on this triptych are available in our recent paper (Zalian et al., submitted). Their aim is to offer a simple and powerful way to extract frequency. Amongst the numerous improvements offered by the program, we will particularly focus on the reduction of aliases and the ability to look directly for multiple-period phenomena and the Blazhko effect. After that, we will show the first results from PDM13 using the Antarctica photometric survey. |
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1096 |
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yes |
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4908 |
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Author |
Zalian C, Chadid M, Vernin J, Abe L, Agabi A, |
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Title |
Antarctica photometry of the Blazhko RR Lyrae star S Arae
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Type |
Journal Article |
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Year |
2015 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
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Volume |
456 |
Issue |
1 |
Pages |
192-206 |
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Abstract |
We pursue the study of S Arae, an RRab Lyrae Blazho star, using unique, uninterrupted and accurate optical photometric data acquired from Antarctica at Dome C by PAIX – Photometer AntarctIca eXtraction – during 150 d. The PAIX data were analysed using both Period04 and PDM13. Besides a main pulsation period of 0.452 d and a modulation period of 47.264 d, three other significant frequencies were found. Multiplet patterns, up to the ninth order, were also extracted, showing a clear asymmetric structure. Following these results, a new approximation of the main-frequency harmonics amplitude decrease is suggested, replacing the usual exponential fit by a hyperbolic one. The physical properties of the Blazhko star, namely metallicity, temperature, mass, were obtained using a new approach based on the study of these parameters for each Blazhko phase. Finally, the PAIX data reveal a residual scatter that occurs during a small phase interval, 10 per cent of the pulsation period, corresponding to the phase of the main shock passage across the atmosphere. The position of the so-called main bump, corresponding to the shock resulting from the infalling atmosphere and the expanding photosphere, varies from one cycle to another and, moreover, around this main bump, two other bumps appear and vanish at different phases during a Blazhko cycle. Following these observations, we discuss the relation between the bump topology and the Blazhko period and give new insights for future Blazhko theoretical investigations.
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1096 |
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ISSN |
0035-8711 |
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yes |
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Call Number |
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Serial |
6247 |
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Author |
Zalian C, Chadid M, Stellingwerf R F, |
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Title |
pdm13: a new graphical interfaced program for frequency analysis
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Type |
Journal Article |
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Year |
2014 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
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Volume |
440 |
Issue |
1 |
Pages |
68 -74 |
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Keywords |
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Abstract |
Frequency analysis of pulsating stars can be performed via several algorithms. Still, each of these methods has its own specific flaws which advocates for the use of as many tools as possible. However, the lack of simple programs with straightforward interface impedes such a goal. PDM13 is a new software dedicated to spectral analysis based on the phase dispersion minimization technique. Its graphical environment, combined with complementary tools, such as auto-segmentation, makes it a simple and powerful mean for frequency extraction. In this paper, a detailed description of the mathematical algorithms is presented. Then, we introduce the options and interface of PDM13. Finally, we compare the results from different case study using PDM13 and other programs. |
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1096 |
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0035-8711 |
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yes |
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Serial |
4907 |
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Author |
Zachary J. Oppler, Kayleigh R. O’Keeffe, Karen D. McCoy, Dustin Brisson |
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Title |
Evolutionary Genetics of Borrelia |
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Journal |
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Year |
2021 |
Publication |
Current issues in molecular biology |
Abbreviated Journal |
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Volume |
42 |
Issue |
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Pages |
97-112 |
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Keywords |
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Abstract |
The genus Borrelia consists of evolutionarily and genetically diverse bacterial species that cause a variety of diseases in humans and domestic animals. These vector-borne spirochetes can be classified into two major evolutionary groups, the Lyme borreliosis clade and the relapsing fever clade, both of which have complex transmission cycles during which they interact with multiple host species and arthropod vectors. Molecular, ecological, and evolutionary studies have each provided significant contributions towards our understanding of the natural history, biology and evolutionary genetics of Borrelia species; however, integration of these studies is required to identify the evolutionary causes and consequences of the genetic variation within and among Borrelia species. For example, molecular and genetic studies have identified the adaptations that maximize fitness components throughout the Borrelia lifecycle and enhance transmission efficacy but provide limited insights into the evolutionary pressures that have produced them. Ecological studies can identify interactions between Borrelia species and the vertebrate hosts and arthropod vectors they encounter and the resulting impact on the geographic distribution and abundance of spirochetes but not the genetic or molecular basis underlying these interactions. In this review we discuss recent findings on the evolutionary genetics from both of the evolutionarily distinct clades of Borrelia species. We focus on connecting molecular interactions to the ecological processes that have driven the evolution and diversification of Borrelia species in order to understand the current distribution of genetic and molecular variation within and between Borrelia species. |
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333 |
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ISSN |
1467-3037 |
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yes |
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Call Number |
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Serial |
8521 |
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Author |
Z. Duputel, L. Rivera |
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Title |
Long-period analysis of the 2016 Kaikoura earthquake |
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Journal |
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Year |
2017 |
Publication |
Physics of the Earth and Planetary Interiors |
Abbreviated Journal |
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Volume |
265 |
Issue |
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Pages |
62-66 |
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Keywords |
Earthquake Megathrust New Zealand Strike-slip Surface waves |
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Abstract |
The recent Mw=7.8 Kaikoura (New Zealand) earthquake involved a remarkably complex rupture propagating in an intricate network of faults at the transition between the Alpine fault in the South Island and the Kermadec-Tonga subduction zone. We investigate the main features of this complicated rupture process using long-period seismological observations. Apparent Rayleigh-wave moment-rate functions reveal a clear northeastward directivity with an unusually weak rupture initiation during 60s followed by a major 20s burst of moment rate. To further explore the rupture process, we perform a Bayesian exploration of multiple point-source parameters in a 3-D Earth model. The results show that the rupture initiated as a small strike-slip rupture and propagated to the northeast, triggering large slip on both strike-slip and thrust faults. The Kaikoura earthquake is thus a rare instance in which slip on intraplate faults trigger extensive interplate thrust faulting. This clearly outlines the importance of accounting for secondary faults when assessing seismic and tsunami hazard in subduction zones. |
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133 |
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0031-9201 |
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0031-9201 |
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yes |
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6769 |
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Author |
Yvon Le Maho, Jason D. Whittington, Nicolas Hanuise, Louise Pereira, Matthieu Boureau, Mathieu Brucker, Nicolas Chatelain, Julien Courtecuisse, Francis Crenner, Benjamin Friess, Edith Grosbellet, Laëtitia Kernaléguen, Frédérique Olivier, Claire Saraux, Nathanaël Vetter, Vincent A. Viblanc, Bernard Thierry, Pascale Tremblay, René Groscolas, Céline Le Bohec |
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Title |
Rovers minimize human disturbance in research on wild animals |
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Journal |
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Year |
2014 |
Publication |
Nature Methods |
Abbreviated Journal |
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Volume |
11 |
Issue |
12 |
Pages |
1242-1244 |
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Abstract |
Investigating wild animals while minimizing human disturbance remains an important methodological challenge. When approached by a remote-operated vehicle (rover) which can be equipped to make radio-frequency identifications, wild penguins had significantly lower and shorter stress responses (determined by heart rate and behavior) than when approached by humans. Upon immobilization, the rover—unlike humans—did not disorganize colony structure, and stress rapidly ceased. Thus, rovers can reduce human disturbance of wild animals and the resulting scientific bias. |
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137 |
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1548-7105 |
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1548-7105 |
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yes |
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6692 |
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Author |
Yves Le Bras, Joffrey Jouma’a, Christophe Guinet |
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Title |
Three-dimensional space use during the bottom phase of southern elephant seal dives |
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Journal |
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Year |
2017 |
Publication |
Movement Ecology |
Abbreviated Journal |
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Volume |
5 |
Issue |
1 |
Pages |
18 |
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Abstract |
In marine pelagic ecosystems, the spatial distribution of biomass is heterogeneous and dynamic. At large scales, physical processes are the main driving forces of biomass distribution. At fine scales, both biotic and abiotic parameters are likely to be key determinants in the horizontal and vertical distribution of biomass, with direct consequences on the foraging behaviour of diving predators. However, fine scale three-dimensional (3D) spatial interactions between diving predators and their prey are still poorly known. |
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109 |
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2051-3933 |
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2051-3933 |
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yes |
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7169 |
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Author |
Yves Le Bras, Joffrey Jouma’a, Baptiste Picard, Christophe Guinet |
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Title |
How Elephant Seals (Mirounga leonina) Adjust Their Fine Scale Horizontal Movement and Diving Behaviour in Relation to Prey Encounter Rate |
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Journal |
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Year |
2016 |
Publication |
Plos one |
Abbreviated Journal |
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Volume |
11 |
Issue |
12 |
Pages |
e0167226 |
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Keywords |
Foraging Predation Acceleration Animal behavior Predator-prey dynamics Seals Swimming Water columns |
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Abstract |
Understanding the diving behaviour of diving predators in relation to concomitant prey distribution could have major practical applications in conservation biology by allowing the assessment of how changes in fine scale prey distribution impact foraging efficiency and ultimately population dynamics. The southern elephant seal (Mirounga leonina, hereafter SES), the largest phocid, is a major predator of the southern ocean feeding on myctophids and cephalopods. Because of its large size it can carry bio-loggers with minimal disturbance. Moreover, it has great diving abilities and a wide foraging habitat. Thus, the SES is a well suited model species to study predator diving behaviour and the distribution of ecologically important prey species in the Southern Ocean. In this study, we examined how SESs adjust their diving behaviour and horizontal movements in response to fine scale prey encounter densities using high resolution accelerometers, magnetometers, pressure sensors and GPS loggers. When high prey encounter rates were encountered, animals responded by (1) diving and returning to the surface with steeper angles, reducing the duration of transit dive phases (thus improving dive efficiency), and (2) exhibiting more horizontally and vertically sinuous bottom phases. In these cases, the distance travelled horizontally at the surface was reduced. This behaviour is likely to counteract horizontal displacement from water currents, as they try to remain within favourable prey patches. The prey encounter rate at the bottom of dives decreased with increasing diving depth, suggesting a combined effect of decreased accessibility and prey density with increasing depth. Prey encounter rate also decreased when the bottom phases of dives were spread across larger vertical extents of the water column. This result suggests that the vertical aggregation of prey can regulate prey density, and as a consequence impact the foraging success of SESs. To our knowledge, this is one of only a handful of studies showing how the vertical distributions and structure of prey fields influence the prey encounter rates of a diving predator. |
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109 |
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1932-6203 |
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1932-6203 |
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yes |
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6607 |
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