| |
Records |
Links |
|
Author |
|
|
| |
Title |
Intrathalline Metabolite Profiles in the Lichen Argopsis friesiana Shape Gastropod Grazing Patterns |
Type |
Journal |
| |
Year |
2018 |
Publication |
Journal of Chemical Ecology |
Abbreviated Journal |
|
|
| |
Volume |
44 |
Issue  |
5 |
Pages |
471-482 |
|
| |
Keywords |
Chemical ecology Herbivory Lichen-gastropod interactions Notodiscus hookeri Snail Stereocaulaceae Subantarctic islands |
|
| |
Abstract |
Lichen-gastropod interactions generally focus on the potential deterrent or toxic role of secondary metabolites. To better understand lichen-gastropod interactions, a controlled feeding experiment was designed to identify the parts of the lichen Argopsis friesiana consumed by the Subantarctic land snail Notodiscus hookeri. Besides profiling secondary metabolites in various lichen parts (apothecia, cephalodia, phyllocladia and fungal axis of the pseudopodetium), we investigated potentially beneficial resources that snails can utilize from the lichen (carbohydrates, amino acids, fatty acids, polysaccharides and total nitrogen). Notodiscus hookeri preferred cephalodia and algal layers, which had high contents of carbohydrates, nitrogen, or both. Apothecia were avoided, perhaps due to their low contents of sugars and polyols. Although pseudopodetia were characterized by high content of arabitol, they were also rich in medullary secondary compounds, which may explain why they were not consumed. Thus, the balance between nutrients (particularly nitrogen and polyols) and secondary metabolites appears to play a key role in the feeding preferences of this snail. |
|
| |
Programme |
136 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1573-1561 |
ISBN |
1573-1561 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7022 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Mass spectrometry as a versatile ancillary technique for the rapid in situ identification of lichen metabolites directly from TLC plates |
Type |
Journal |
| |
Year |
2017 |
Publication |
The Lichenologist |
Abbreviated Journal |
|
|
| |
Volume |
49 |
Issue |
5 |
Pages |
507-520 |
|
| |
Keywords |
acetone extracts analytical techniques chemical profiling Usnea trachycarpa |
|
| |
Abstract |
Thin-layer chromatography (TLC) still enjoys widespread popularity among lichenologists as one of the fastest and simplest analytical strategies, today remaining the primary method of assessing the secondary product content of lichens. The pitfalls associated with this approach are well known as TLC leads to characterizing compounds by comparison with standards rather than properly identifying them, which might lead to erroneous assignments, accounting for the long-held interest in hyphenating TLC with dedicated identification tools. As such, commercially available TLC/Mass Spectrometry (MS) interfaces can be easily connected to any brand of mass spectrometer without adjustments. The spots of interest are extracted from the TLC plate to retrieve mass spectrometric signals within one minute, thereby ensuring accurate identification of the chromatographed substances. The results of this hyphenated strategy for lichens are presented here by 1) describing the TLC migration and direct MS analysis of single lichen metabolites of various structural classes, 2) highlighting it through the chemical profiling of crude acetone extracts of a set of lichens of known chemical composition, and finally 3) applying it to a lichen of unknown profile, Usnea trachycarpa. |
|
| |
Programme |
136 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0024-2829, 1096-1135 |
ISBN |
0024-2829, 1096-1135 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7025 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Evidence for a differential sea level rise between hemispheres over the twentieth century |
Type |
Journal |
| |
Year |
2014 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
41 |
Issue |
5 |
Pages |
1639-1643 |
|
| |
Keywords |
climate change geodesy GPS land motion sea level tide gauge |
|
| |
Abstract |
AbstractTide gauge records are the primary source of sea level information over multidecadal to century timescales. A critical issue in using this type of data to determine global climate-related contributions to sea level change concerns the vertical motion of the land upon which the gauges are grounded. Here we use observations from the Global Positioning System for the correction of this vertical land motion. As a result, the spatial coherence in the rates of sea level change during the twentieth century is highlighted at the local and the regional scales, ultimately revealing a clearly distinct behavior between the Northern and the Southern Hemispheres with values of 2.0 mm/yr and 1.1 mm/yr, respectively. Our findings challenge the widely accepted value of global sea level rise for the twentieth century. |
|
| |
Programme |
688 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
1944-8007 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7080 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Stable isotopes document the winter foraging ecology of king penguins and highlight connectivity between subantarctic and Antarctic ecosystems |
Type |
Journal |
| |
Year |
2018 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
|
|
| |
Volume |
8 |
Issue |
5 |
Pages |
2752-2765 |
|
| |
Keywords |
diet myctophid prolactin seabird Southern Ocean |
|
| |
Abstract |
|
|
| |
Programme |
109,394 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Bachelor's thesis |
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
2045-7758 |
ISBN |
2045-7758 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7114 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Avian cholera outbreaks threaten seabird species on Amsterdam Island |
Type |
Journal |
| |
Year |
2018 |
Publication |
PLOS ONE |
Abbreviated Journal |
|
|
| |
Volume |
13 |
Issue |
5 |
Pages |
e0197291 |
|
| |
Keywords |
Birds Bone marrow Cholera Islands Pasteurella multocida Penguins Seabirds Sequence databases |
|
| |
Abstract |
Infectious diseases may be particularly critical for the conservation of endangered species. A striking example is the recurrent outbreaks that have been occurring in seabirds on Amsterdam Island for the past 30 years, threatening populations of three Endangered seabird species and of the endemic, Critically Endangered Amsterdam albatross Diomedea amsterdamensis. The bacteria Pasteurella multocida (avian cholera causative agent), and to a lesser extent Erysipelothrix rhusiopathiae (erysipelas causative agent), were both suspected to be responsible for these epidemics. Despite this critical situation, demographic trends were not available for these threatened populations, and the occurrence and characterization of potential causative agents of epizootics remain poorly known. The aims of the current study were to (i) provide an update of population trends for four threatened seabird species monitored on Amsterdam Island, (ii) assess the occurrence of P. multocida, and E. rhusiopathiae in live birds from five species, (iii) search for other infectious agents in these samples and, (iv) isolate and genotype the causative agent(s) of epizooties from dead birds. Our study shows that the demographic situation has worsened substantially in three seabird species during the past decade, with extremely low reproductive success and declining populations for Indian yellow-nosed albatrosses Thalassarche carteri, sooty albatrosses Phoebetria fusca, and northern rockhopper penguins Eudyptes moseleyi. Pasteurella multocida or E. rhusiopathiae were detected by PCR in live birds of all five investigated species, while results were negative for eight additional infectious agents. A single strain of P. multocida was repeatedly cultured from dead birds, while no E. rhusiopathiae could be isolated. These results highlight the significance of P. multocida in this particular eco-epidemiological system as the main agent responsible for epizootics. The study stresses the urgent need to implement mitigation measures to alter the course of avian cholera outbreaks threatening the persistence of seabird populations on Amsterdam Island. |
|
| |
Programme |
109,1151 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Bachelor's thesis |
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1932-6203 |
ISBN |
1932-6203 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7120 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Julien Collet, Samantha C. Patrick, Henri Weimerskirch |
|
| |
Title |
A comparative analysis of the behavioral response to fishing boats in two albatross species |
Type |
Journal |
| |
Year |
2017 |
Publication |
Behavioral Ecology |
Abbreviated Journal |
|
|
| |
Volume |
28 |
Issue |
5 |
Pages |
1337-1347 |
|
| |
Keywords |
|
|
| |
Abstract |
Lay Summary. Smaller and less generalist Black-Browed albatrosses were more strongly attracted to encountered fishing boats than dominant Wandering albatrosses |
|
| |
Programme |
109 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1045-2249 |
ISBN |
1045-2249 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7155 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Marine Bioluminescence: Measurement by a Classical Light Sensor and Related Foraging Behavior of a Deep Diving Predator |
Type |
Journal |
| |
Year |
2017 |
Publication |
Photochemistry and Photobiology |
Abbreviated Journal |
|
|
| |
Volume |
93 |
Issue |
5 |
Pages |
1312-1319 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
109 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1751-1097 |
ISBN |
1751-1097 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7183 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Krystyna M. Saunders, Dominic A. Hodgson, Shelley Mcmurtrie, Martin Grosjean |
|
| |
Title |
|
Type |
Journal |
| |
Year |
2015 |
Publication |
Journal of Quaternary Science |
Abbreviated Journal |
|
|
| |
Volume |
30 |
Issue |
5 |
Pages |
464-477 |
|
| |
Keywords |
Campbell Island diatom transfer function Southern Hemisphere sub-Antarctic westerly winds |
|
| |
Abstract |
|
|
| |
Programme |
1133 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1099-1417 |
ISBN |
1099-1417 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7214 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Lipid-induced thermogenesis is up-regulated by the first cold-water immersions in juvenile penguins |
Type |
Journal |
| |
Year |
2016 |
Publication |
Journal of Comparative Physiology B |
Abbreviated Journal |
|
|
| |
Volume |
186 |
Issue |
5 |
Pages |
639-650 |
|
| |
Keywords |
Energy substrates Metabolism Mitochondria Oxidative phosphorylation efficiency Skeletal muscle |
|
| |
Abstract |
|
|
| |
Programme |
131 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1432-136X |
ISBN |
1432-136X |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7220 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Uncovering population structure in the Humboldt penguin (Spheniscus humboldti) along the Pacific coast at South America |
Type |
Journal |
| |
Year |
2019 |
Publication |
PLOS ONE |
Abbreviated Journal |
|
|
| |
Volume |
14 |
Issue |
5 |
Pages |
e0215293 |
|
| |
Keywords |
Animal sociality Chile (country) Gene flow Haplotypes Islands Penguins Population genetics Seabirds |
|
| |
Abstract |
The upwelling hypothesis has been proposed to explain reduced or lack of population structure in seabird species specialized in food resources available at cold-water upwellings. However, population genetic structure may be challenging to detect in species with large population sizes, since variation in allele frequencies are more robust under genetic drift. High gene flow among populations, that can be constant or pulses of migration in a short period, may also decrease power of algorithms to detect genetic structure. Penguin species usually have large population sizes, high migratory ability but philopatric behavior, and recent investigations debate the existence of subtle population structure for some species not detected before. Previous study on Humboldt penguins found lack of population genetic structure for colonies of Punta San Juan and from South Chile. Here, we used mtDNA and nuclear markers (10 microsatellites and RAG1 intron) to evaluate population structure for 11 main breeding colonies of Humboldt penguins, covering the whole spatial distribution of this species. Although mtDNA failed to detect population structure, microsatellite loci and nuclear intron detected population structure along its latitudinal distribution. Microsatellite showed significant Rst values between most of pairwise locations (44 of 56 locations, Rst = 0.003 to 0.081) and 86% of individuals were assigned to their sampled colony, suggesting philopatry. STRUCTURE detected three main genetic clusters according to geographical locations: i) Peru; ii) North of Chile; and iii) Central-South of Chile. The Humboldt penguin shows signal population expansion after the Last Glacial Maximum (LGM), suggesting that the genetic structure of the species is a result of population dynamics and foraging colder water upwelling that favor gene flow and phylopatric rate. Our findings thus highlight that variable markers and wide sampling along the species distribution are crucial to better understand genetic population structure in animals with high dispersal ability. |
|
| |
Programme |
137 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Bachelor's thesis |
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1932-6203 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
6962 |
|
| Permanent link to this record |
