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Author |
Bart Van de Vijver, Luc Ector |
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Title |
Microcostatus elisabethianus, a new limnoterrestrial diatom species (Bacillariophyta) from the sub-Antarctic region |
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Journal |
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Year |
2019 |
Publication |
Plant Ecology and Evolution |
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Volume |
152 |
Issue |
3 |
Pages |
539-545 |
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Background and aims – During a survey of the soil diatom flora of the sub-Antarctic islands in the southern Indian Ocean, an unknown small-celled naviculoid taxon was discovered living in small cracks in cliffs bordering the ocean. The taxon showed a set of morphological features only found in the genus Microcostatus. However, the unknown taxon could not be identified using the currently available literature. Methods – Using both light microscopical and scanning electron microscopical techniques, the morphology of the unknown Microcostatus taxon was documented. The new taxon is described, illustrated and compared with all other similar Microcostatus taxa worldwide. Key results – Microcostatus elisabethianus possesses a unique combination of morphological features that excludes conspecificity with all other members of the genus. It is characterized by a lanceolate valve outline with protracted, elongate apices, a very large, porous conopeum reaching the valve margins and uniseriate striae composed of only one macroareola and mantle areolae restricted to the valve apices. The morphological features of the genus Microcostatus are evaluated and discussed. Notes on the occurrence and ecology of the new taxon are added. |
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2032-3921 |
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yes |
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7713 |
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Author |
Van de Vijver Bart, |
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Title |
Revision of the genus Halamphora (Bacillariophyta) in the Antarctic Region
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Type |
Journal Article |
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Year |
2014 |
Publication |
Plant Ecology and Evolution |
Abbreviated Journal |
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Volume |
147 |
Issue |
3 |
Pages |
374-391 |
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Background and aims – The limnoterrestrial and aquatic diatom flora of the entire Antarctic Region (sub-Antarctic islands, Maritime Antarctic Region, Antarctic Continent) is currently under revision. One of the genera that still needed a thorough analysis is the genus Halamphora, recently split off from Amphora. Halamphora species are a typical constituent of the lake diatom flora in the Antarctic region.
Methods – Using both Light Microscopical (LM) and Scanning Electron Microscopical (SEM) techniques, the morphology of a large number of Halamphora taxa, present in the samples from the Antarctic Region, has been analysed. Each taxon is properly described, illustrated and compared with other morphologically similar Halamphora taxa, known worldwide.
Key results – A total of seven Halamphora taxa has been found. Two taxa could be identified using the currently available literature: Halamphora veneta (Kütz.) Levkov and H. oligotraphenta (Lange-Bert.) Levkov. Five new Halamphora species are described: Halamphora ausloosiana Van de Vijver & Kopalová sp. nov., H. compereana Van de Vijver & Levkov sp. nov., H. dagmarobbelsiana Van de Vijver & Levkov sp. nov., H. lateantarctica Van de Vijver, Kopalová, Zidarova & Levkov sp. nov. and H. vyvermaniana Van de Vijver, Kopalová, Zidarova & Levkov sp. nov.
Conclusions – The obtained results confirm the presence of a typical and highly specific limnoterrestrial diatom flora in the Antarctic Region and contradict the generally accepted idea about the worldwide distribution of diatoms. |
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136 |
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Botanic Garden Meise and Royal Botanical Society of Belgium |
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2032-3913 |
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yes |
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5755 |
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Author |
Van de Vijver Bart, de Haan Myriam, Lange-Bertalot Horst, |
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Title |
Revision of the genus Eunotia (Bacillariophyta) in the Antarctic Region
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Journal Article |
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Year |
2014 |
Publication |
Plant Ecology and Evolution |
Abbreviated Journal |
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Volume |
147 |
Issue |
2 |
Pages |
256-284 |
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Keywords |
ANTARCTIC REGION, BACILLARIOPHYTA, BIOGEOGRAPHY, EUNOTIA, MORPHOLOGY, NEW SPECIES, TAXONOMY, |
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Background and aims – The past few years, the limnoterrestrial and aquatic diatom flora of the entire Antarctic Region (sub-Antarctic islands, Maritime Antarctic Region, Antarctic Continent) is currently under revision. One of the genera that still needed a revision is the genus Eunotia, quite common in wet to semi-wet moss vegetations in the sub-Antarctic and Maritime Antarctic Region.
Methods – Using both Light Microscopical and Scanning Electron Microscopical techniques, the morphology of all Eunotia taxa, present in the samples from the Antarctic Region, has been analysed. Each taxon is properly described, illustrated and compared with all other possible similar Eunotia taxa, known worldwide.
Key results – A total of nineteen Eunotia taxa has been found of which one remains unidentified and is discussed as Eunotia sp. 1. Six taxa could be identified using the currently available literature: Eunotia meisterioides Lange-Bert., E. muscicola Krasske var. muscicola, E. paludosa Grunow var. paludosa, E. pyramidatoides, E. seminulum Nörpel-Schempp & Lange-Bert. and E. tecta Krasske. Ten new Eunotia species and two new subspecies are described: Eunotia amayae sp. nov., E. amayae subsp. heardensis subsp. nov., E. australomaior sp. nov., E. clotii sp. nov., E. frigida sp. nov., E. mcbridei sp. nov., E. mourotii sp. nov., E. muscicola subsp. polyglyphis subsp. nov., E. parallelogramma sp. nov., E. pseudopaludosa sp. nov., E. ralitsae sp. nov. and E. subantarctica sp. nov.
Conclusions – The obtained results confirm the presence of a typical and highly specific limnoterrestrial diatom flora in the Antarctic Region and contradict the generally accepted idea about the worldwide distribution of diatoms. |
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136 |
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2032-3913 |
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yes |
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5166 |
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Author |
E. Thebault, A. Chulliat, S. Maus, G. Hulot, B. Langlais, A. Chambodut and M. Menvielle |
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Title |
IGRF candidate models at times of rapid changes in core field acceleration
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Journal Article |
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Year |
2010 |
Publication |
EARTH PLANETS AND SPACE |
Abbreviated Journal |
1343-8832 |
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Volume |
62 |
Issue |
10 |
Pages |
753-763 |
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Abstract |
We submit three candidate models following the call for IGRF-11. We apply a simple modeling approach in spherical harmonics based on a quadratic Taylor expansion for the internal field time variations. We use the Dst magnetic index as a proxy for the external field variations. In order to compensate for the limitations incurred by such a conventional approach, we focus on the optimal selection of satellite data in space and time. We also show that some a priori knowledge about the core field state helps us to avoid the pitfall encountered in the case of rapid changes of core field accelerations. Indeed, various acceleration events of relevance for the IGRF 11th occurred between 2003 and 2010, one of them being a geomagnetic jerk. They could entail disagreements between IGRF candidate models for the secular variation (SV) if data prior to 2008 are used. Our SV and main field (MF) candidate models have a root mean square uncertainty less than 6 nT/yr and 8nT, respectively, with respect to the modeled magnetic field contributions. These values correspond to the intrinsic error associated with truncating SV and MF models to spherical harmonic degree 8 and 13, respectively, as requested for IGRF models. |
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905 |
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1343-8832 |
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3133 |
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Author |
Aline Peltier, Arnaud Chulliat |
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Title |
On the feasibility of promptly producing quasi-definitive magnetic observatory data |
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2010 |
Publication |
Earth, planets and space |
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62 |
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2 |
Pages |
e5-e8 |
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Keywords |
baseline data processing geomagnetic modeling Magnetic observatory quasi-definitive data |
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Abstract |
Magnetic observatories currently distribute two types of data: preliminary data, available in less than 72 hrs in the case of INTERMAGNET observatories, and definitive baseline-corrected data, produced only once a year. Several users and groups of users have expressed the need for baseline-corrected observatory data produced in a continuous manner. The main applications for such quasi-definitive data include geomagnetic field modeling and the calculation of geomagnetic activity indices. We present an original method for producing quasi-definitive data at the end of each calendar month using temporary baselines. Preliminary and definitive data at nine INTERMAGNET observatories are used to test this method, simulating the production of quasi-definitive data throughout the year 2008. The temporary baselines obtained are very close to the definitive ones, except during the last few days of each time interval. The means and standard deviations of the differences between quasi-definitive and definitive data do not exceed 0.3 nT, well below the current INTERMAGNET standard of accuracy. This result demonstrates the feasibility of promptly producing quasi-definitive data at most magnetic observatories of INTERMAGNET type. |
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1880-5981 |
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1880-5981 |
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yes |
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7435 |
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Author |
Frédéric Barraquand, John-André Henden, Olivier Gilg, Rolf A. Ims, Nigel G. Yoccoz |
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Title |
The Traill island model for lemming dynamics, how it compares to Fennoscandian vole dynamics models, and a proposed simplification |
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2022 |
Publication |
Arxiv |
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2205.09441 |
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Keywords |
Quantitative Biology – Populations and Evolution |
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The Traill island model of Gilg et al. (2003) is a landmark attempt at mechanistic modelling of the cyclic population dynamics of rodents, focusing on a high Arctic community. It models the dynamics of one prey, the collared lemming, and four predators : the stoat, the Arctic fox, the long-tailed skua and the snowy owl. In the present short note, we first summarize how the model works in light of theory on seasonally forced predator-prey systems, with a focus on the temporal dynamics of predation rates. We show notably how the impact of generalist predation, which is able here to initiate population declines, differs slightly from that of generalist predation in other mechanistic models of rodent-mustelid interactions such as Turchin & Hanski (1997). We then provide a low-dimensional approximation with a single generalist predator compartment that mimics the essential features of the Traill island model: cycle periodicity, amplitude, shape, as well as generalist-induced declines. This simpler model should be broadly applicable to model other lemming populations that predominantly grow under the snow during the winter period. Matlab computer codes for Gilg et al. (2003), its two-dimensional approximation, as well as alternative lemming population dynamics models are provided. |
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8596 |
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Florian Haslinger, Roberto Basili, Rémy Bossu, Carlo Cauzzi, Fabrice Cotton, Helen Crowley, Susana Custodio, Laurentiu Danciu, Mario Locati, Alberto Michelini, Irene Molinari, Lars Ottemöller, Stefano Parolai |
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Title |
Coordinated and Interoperable Seismological Data and Product Services in Europe: the EPOS Thematic Core Service for Seismology |
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Journal |
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Year |
2022 |
Publication |
Annals of Geophysics |
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Volume |
65 |
Issue |
2 |
Pages |
DM213-DM213 |
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In this article we describe EPOS Seismology, the Thematic Core Service consortium for the seismology domain within the European Plate Observing System infrastructure. EPOS Seismology was developed alongside the build-up of EPOS during the last decade, in close collaboration between the existing pan-European seismological initiatives ORFEUS (Observatories and Research Facilities for European Seismology), EMSC (Euro-Mediterranean Seismological Center) and EFEHR (European Facilities for Earthquake Hazard and Risk) and their respective communities. It provides on one hand a governance framework that allows a well-coordinated interaction of the seismological community services with EPOS and its bodies, and on the other hand it strengthens the coordination among the already existing seismological initiatives with regard to data, products and service provisioning and further development. Within the EPOS Delivery Framework, ORFEUS, EMSC and EFEHR provide a wide range of services that allow open access to a vast amount of seismological data and products, following and implementing the FAIR principles and supporting open science. Services include access to raw seismic waveforms of thousands of stations together with relevant station and data quality information, parametric earthquake information of recent and historical earthquakes together with advanced event-specific products like moment tensors or source models and further ancillary services, and comprehensive seismic hazard and risk information, covering latest European scale models and their underlying data. The services continue to be available on the well-established domain-specific platforms and websites, and are also consecutively integrated with the interoperable central EPOS data infrastructure. EPOS Seismology and its participating organizations provide a consistent framework for the future development of these services and their operation as EPOS services, closely coordinated also with other international seismological initiatives, and is well set to represent the European seismological research infrastructures and their stakeholders within EPOS. |
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2037-416X |
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yes |
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8336 |
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Mauro Domenico Di, Cafarella Lili, Lepidi Stefania, Pietrolungo Manuela, Alfonsi Laura, Chambodut Aude, |
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Geomagnetic polar observatories: the role of Concordia station at Dome C, Antarctica
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2015 |
Publication |
Annals of Geophysics |
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57 |
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6 |
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Antarctica, Azimuth Mark Determination, Concordia, Dome C, GNSS, Geomagnetic observatory, |
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A geomagnetic observatory is a permanent facility where magnetic declination and inclination are recorded in conjunction with the temporal evolution of the magnetic field components. Polar regions are scarcely covered by observational points then the contributions from observatories located there are particularly relevant. The geomagnetic observatory at Concordia station, Dome C – Antarctica is located in the inner part of the continent, its position is favorable for two key reasons, i) data are unaltered by the "coastal effect” and ii) crustal effect is negligible due to the thickness, almost 3 km, of ice coverage. Nevertheless, these latter conditions imply an unconsidered aspect which characterizes the entire station and every structure laying on the ice surface: the dome on which Concordia station resides is sliding horizontally and moving vertically with a velocity of few millimeter to centimeters per year as indicated by independent geodetic observations. This slow and continuous movement has a puzzling effect on the trend of horizontal components of the magnetic field, sampled in a time window of a decade since the establishing of the observatory in 2005. During the International Polar Year (2007-2009) the observatory was upgraded with new equipment fulfilling the requirements of the Intermagnet consortium, and becoming an observatory member in 2011. In this paper are illustrated the strategy adopted to track any possible displacement of the observatory reference points (i.e. the azimuth mark, the pillar position) and all the ordinary and extraordinary actions required for collecting high quality data. |
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ISSN |
1593-5213 |
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yes |
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6057 |
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Alessia Maggi, Maxime Bes de Berc, Jean-Yves Thoré, Jean-Jacques Lévêque |
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Title |
Concordia, Antarctica, seismic experiment for the International Polar Year (CASE-IPY) |
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Journal Article |
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2014 |
Publication |
Annals of Geophysics |
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57 |
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3 |
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The CASE-IPY project, part of the larger POLENET initiative of geophysical observations for the International Polar Year, was built on our extensive experience of running seismological stations in Antarctica, both on rock sites (Dumont d’Urville station), and directly on the ice plateau (Concordia station). For CASE-IPY, we deployed 8 temporary seismic stations on the Antarctic plateau: 3 situated near Concordia itself (starting 2008), and the other 5 regularly spaced between Concordia and Vostok (2010-2012), following the maximum in ice topography. The technical problems we have encountered in our field deployments were essentially due to a combination of extreme environmental conditions and isolation of deployment sites. The 3 stations near Concordia were used as test sites to experiment different solutions, and to converge on a design for the 5 main stations. Results from the nearest stations, which transmit data regularly to Concordia, are very promising. The data recorded by our stations will be distributed widely in the scientific community. We expect them to be exploited essentially for structural studies involving Antarctica itself (its ice-cap, crust and lithosphere) via receiver functions, noise correlation, and surface-wave tomography, but also for studies of the Earth’s core. |
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1593-5213 |
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yes |
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5016 |
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Xing Xiaogang, Claustre Hervé, Blain Stéphane, D'Ortenzio Fabrizio, Antoine David, Ras Josephine, Guinet Christophe, |
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Title |
Quenching correction for in vivo chlorophyll fluorescence acquired by autonomous platforms: a case study with instrumented elephant seals in the Kerguelen region (Southern Ocean)
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2012 |
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Limnology and Oceanography: Methods |
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10 |
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483-495 |
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As the proxy for Chlorophyll a (Chl a) concentration, thousands of fluorescence profiles were measured by instrumented elephant seals in the Kerguelen region (Southern Ocean). For accurate retrieval of Chl a concentrations acquired by in vivo fluorometer, a two-step procedure is applied: 1) A predeployment intercalibration with accurate determination by high performance liquid chromatography (HPLC) analysis, which not only calibrates fluorescence in appropriate Chl a concentration units, but also strongly reduces variability between fluorometers, and 2) a profile-by-profile quenching correction analysis, which effectively eliminates the fluorescence quenching issue at surface around noon, and results in consistent profiles between day and night. The quenching correction is conducted through an extrapolation of the deep fluorescence value toward surface. As proved by a validation procedure in the Western Mediterranean Sea, the correction method is practical and relatively reliable when there is no credible reference, especially for deep mixed waters, as in the Southern Ocean. Even in the shallow mixed waters, the method is also effective in reducing the influence of quenching.
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1541-5856 |
ISBN |
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Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
3905 |
|
| Permanent link to this record |
