| Records |
| Author |
R. Olmi, M. Bittelli, G. Picard, L. Arnaud, A. Mialon, S. Priori |
| Title |
Investigating the influence of the grain size and distribution on the macroscopic dielectric properties of Antarctic firn |
Type |
Journal |
| Year |
2021 |
Publication  |
Cold Regions Science and Technology |
Abbreviated Journal |
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| Volume |
185 |
Issue |
|
Pages |
103254 |
| Keywords |
Antarctica Close?off Dielectric measurements Dielectric model Firn Full wave EM simulations Ice cores |
| Abstract |
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| Programme |
1110 |
| Campaign |
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| Series Editor |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0165-232X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7995 |
| Permanent link to this record |
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| Author |
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| Title |
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Type |
Journal |
| Year |
2021 |
Publication |
Communications Earth & Environment |
Abbreviated Journal |
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| Volume |
2 |
Issue |
1 |
Pages |
1-8 |
| Keywords |
Physical oceanography |
| Abstract |
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| Programme |
688 |
| Campaign |
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| Address |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
2662-4435 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8387 |
| Permanent link to this record |
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| Author |
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| Title |
Toward a global strategy for seabird tracking |
Type |
Journal |
| Year |
2021 |
Publication |
Conservation Letters |
Abbreviated Journal |
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| Volume |
14 |
Issue |
3 |
Pages |
e12804 |
| Keywords |
biogeography biologging biotelemetry ecological monitoring marine conservation oceanography spatial planning threatened species |
| Abstract |
Electronic tracking technologies revolutionized wildlife ecology, notably for studying the movements of elusive species such as seabirds. Those advances are key to seabird conservation, for example in guiding the design of marine protected areas for this highly threatened group. Tracking data are also boosting scientific understanding of marine ecosystem dynamics in the context of global change. To optimize future tracking efforts, we performed a global assessment of seabird tracking data. We identified and mined 689 seabird tracking studies, reporting on > 28,000 individuals of 216 species from 17 families over the last four decades. We found substantial knowledge gaps, reflecting a historical neglect of tropical seabird ecology, with biases toward species that are heavier, oceanic, and from high-latitude regions. Conservation status had little influence on seabird tracking propensity. We identified 54 threatened species for which we did not find published tracking records, and 19 with very little data. Additionally, much of the existing tracking data are not yet available to other researchers and decision-makers in online databases. We highlight priority species and regions for future tracking efforts. More broadly, we provide guidance toward an ethical, rational, and efficient global tracking program for seabirds, as a contribution to their conservation. |
| Programme |
388 |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1755-263X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7981 |
| Permanent link to this record |
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| Author |
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| Title |
Multispecies tracking reveals a major seabird hotspot in the North Atlantic |
Type |
Journal |
| Year |
2021 |
Publication |
Conservation Letters |
Abbreviated Journal |
|
| Volume |
14 |
Issue |
5 |
Pages |
e12824 |
| Keywords |
area beyond national jurisdiction Atlantic biologging conservation high seas marine protected area regional seas convention |
| Abstract |
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| Programme |
330,333,388,1036 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
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Place of Publication |
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Editor |
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Original Title |
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| Series Editor |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1755-263X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8293 |
| Permanent link to this record |
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| Author |
Anzhou Cao, Zheng Guo, Xiaoyu Qi, Peiliang Li, Hailun He |
| Title |
Seasonal and nodal variations of predominant tidal constituents in the global ocean |
Type |
Journal |
| Year |
2021 |
Publication |
Continental Shelf Research |
Abbreviated Journal |
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| Volume |
217 |
Issue |
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Pages |
104372 |
| Keywords |
Fitting Modified two-step harmonic analysis Nodal modulation Seasonal variation Tide gauge Tides |
| Abstract |
Tides are one of the basic types of ocean water motions. Previous studies have reported that the M2 constituent exhibits seasonal variations (annual cycles) in some regions. However, based on the newly proposed method of modified two-step harmonic analysis (HA) and its application at 240 global tide gauges, we find that the M2 constituent as well as the S2 and K1 do not have significant seasonal variations at these tide gauges. The seasonal variations of the M2 constituent reported in previous studies are caused by its satellites, the H1 and H2 constituents, which are not resolved in these studies due to the short time window (one month or three months) used in HA. Because the frequency of the H1 (H2) constituent is equal to that of the M2 minus (plus) the frequency of annual cycles, the superposition of the M2, H1 and H2 constituents with constant amplitudes is equivalent to the M2 constituent with seasonally varying amplitudes. Compared with the new method, some adaptations to traditional HA aiming to capture variations in amplitudes and phase lags of constituents have some limitations, because they either neglect some satellites of the major constitutes or introduce spurious fluctuations resulting from an unreasonably large number of independent points. The nodal modulations of predominant constituents are also explored in this study. On the global scale, the nodal modulations of the M2, K1 and O1 constituents agree with the theoretical predictions, except a cold spot region with reduced nodal modulation in the Gulf of Maine and a hot spot region with enhanced nodal modulation in the South China Sea for the M2. Nodal modulation is also found for the S2 constituent (in theory, the S2 has no nodal modulation), which is 0.8% averaged at 164 tide gauges where the S2 is not too weak. |
| Programme |
688 |
| Campaign |
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Series Title |
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Series Issue |
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Edition |
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| ISSN |
0278-4343 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8032 |
| Permanent link to this record |
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| Author |
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| Title |
The Marine Vegetation of the Kerguelen Islands: History of Scientific Campaigns, Inventory of the Flora and First Analysis of Its Biogeographical Affinities |
Type |
Journal |
| Year |
2021 |
Publication |
Cryptogamie, Algologie |
Abbreviated Journal |
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| Volume |
42 |
Issue |
12 |
Pages |
173-216 |
| Keywords |
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| Abstract |
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| Programme |
1044 |
| Campaign |
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| Series Editor |
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Series Title |
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Series Issue |
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Edition |
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| ISSN |
0181-1568, 1776-0984 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8440 |
| Permanent link to this record |
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| Author |
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| Title |
North Atlantic winter cyclones starve seabirds |
Type |
Journal |
| Year |
2021 |
Publication |
Current Biology |
Abbreviated Journal |
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| Volume |
31 |
Issue |
17 |
Pages |
3964-3971.e3 |
| Keywords |
at-sea distribution cyclones energy expenditure GLS tracking seabird migration seascape ecology |
| Abstract |
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| Programme |
330,388 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
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Place of Publication |
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Editor |
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Summary Language |
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| Series Editor |
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Series Title |
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Series Issue |
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Edition |
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| ISSN |
0960-9822 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8294 |
| Permanent link to this record |
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| Author |
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| Title |
Evolutionary Genetics of Borrelia |
Type |
Journal |
| Year |
2021 |
Publication |
Current issues in molecular biology |
Abbreviated Journal |
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| Volume |
42 |
Issue |
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Pages |
97-112 |
| 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. |
| Programme |
333 |
| Campaign |
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| Address |
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Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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| Series Editor |
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Series Title |
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Series Issue |
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Edition |
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| ISSN |
1467-3037 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8521 |
| Permanent link to this record |
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| Author |
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| Title |
Taxonomy based on limited genomic markers may underestimate species diversity of rockhopper penguins and threaten their conservation |
Type |
Journal |
| Year |
2021 |
Publication |
Diversity and Distributions |
Abbreviated Journal |
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| Volume |
27 |
Issue |
11 |
Pages |
2277-2296 |
| Keywords |
Eudyptes genomics rockhopper penguins species delimitation |
| Abstract |
Aim Delimiting recently diverged species is challenging. During speciation, genetic differentiation may be distributed unevenly across the genome, as different genomic regions can be subject to different selective pressures and evolutionary histories. Reliance on limited numbers of genetic markers that may be underpowered can make species delimitation even more challenging, potentially resulting in taxonomic inconsistencies. Rockhopper penguins of the genus Eudyptes comprise three broadly recognized taxa: northern (E. moseleyi), southern (E. chrysocome) and eastern rockhopper (E. filholi). Their taxonomic status has been controversial for decades, with researchers disagreeing about whether E. chrysocome and E. filholi are distinct species or conspecific. Our goal is to evaluate genome-wide patterns of divergence to evaluate genetic differentiation and species delimitation in rockhopper penguins, and to assess which mechanisms may underlie previous discordance among nuclear versus mitochondrial analyses. Location Sub-Antarctic and temperate coastal regions of the Southern Hemisphere. Methods We generated reduced-representation genomic libraries using double digest restriction-site associated DNA (ddRAD) sequencing to evaluate genetic differentiation, contemporary migration rates and admixture among colonies of rockhopper penguins. Results The extent of genetic differentiation among the three taxa was consistently higher than population-level genetic differentiation found within these and other penguin species. There was no evidence of admixture among the three taxa, suggesting the absence of ongoing gene flow among them. Species delimitation analyses based on molecular data, along with other lines of evidence, provide strong support for the taxonomic distinction of three species of rockhopper penguins. Main conclusions Our results provide strong support for the existence of three distinct species of rockhopper penguins. The recognition of this taxonomic diversity is crucial for the management and conservation of this widely distributed species group. This study illustrates that widespread dispersive seabird lineages lacking obvious morphological differences may nevertheless have complex evolutionary histories and comprise cryptic species diversity. |
| Programme |
354 |
| Campaign |
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| Address |
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Thesis |
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Series Title |
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Series Issue |
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Edition |
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| ISSN |
1472-4642 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8421 |
| Permanent link to this record |
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| Author |
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| Title |
The micrometeorite flux at Dome C (Antarctica), monitoring the accretion of extraterrestrial dust on Earth |
Type |
Journal |
| Year |
2021 |
Publication |
Earth and Planetary Science Letters |
Abbreviated Journal |
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| Volume |
560 |
Issue |
|
Pages |
116794 |
| Keywords |
Antarctic micrometeorites atmospheric entry cosmic spherules extraterrestrial flux interplanetary dust particles zodiacal cloud |
| Abstract |
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| Programme |
1120 |
| Campaign |
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Editor |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0012-821X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8244 |
| Permanent link to this record |
