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Title |
Transcriptome and Peptidome Characterisation of the Main Neuropeptides and Peptidic Hormones of a Euphausiid: The Ice Krill, Euphausia crystallorophias |
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Book Chapter |
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Year |
2013 |
Publication |
PLOS ONE |
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Volume |
8 |
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8 |
Pages |
e71609 |
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Background: The Ice krill, Euphausia crystallorophias is one of the species at the base of the Southern Ocean food chain. Given their significant contribution to the biomass of the Southern Ocean, it is vitally important to gain a better understanding of their physiology and, in particular, anticipate their responses to climate change effects in the warming seas around Antarctica. Methodology/Principal Findings: Illumina sequencing was used to produce a transcriptome of the ice krill. Analysis of the assembled contigs via two different methods, produced 36 new pre-pro-peptides, coding for 61 neuropeptides or peptide hormones belonging to the following families: Allatostatins (A, B et C), Bursicon (α and β), Crustacean Hyperglycemic Hormones (CHH and MIH/VIHs), Crustacean Cardioactive Peptide (CCAP), Corazonin, Diuretic Hormones (DH), the Eclosion Hormone (EH), Neuroparsin, Neuropeptide F (NPF), small Neuropeptide F (sNPF), Pigment Dispersing Hormone (PDH), Red Pigment Concentrating Hormone (RPCH) and finally Tachykinin. LC/MS/MS proteomics was also carried out on eyestalk extracts, which are the major site of neuropeptide synthesis in decapod crustaceans. Results confirmed the presence of six neuropeptides and six precursor-related peptides previously identified in the transcriptome analyses.Conclusions: This study represents the first comprehensive analysis of neuropeptide hormones in a Eucarida non-decapod Malacostraca, several of which are described for the first time in a non-decapod crustacean. Additionally, there is a potential expansion of PDH and Neuropeptide F family members, which may reflect certain life history traits such as circadian rhythms associated with diurnal migrations and also the confirmation via mass spectrometry of several novel pre-pro-peptides, of unknown function. Knowledge of these essential hormones provides a vital framework for understanding the physiological response of this key Southern Ocean species to climate change and provides a valuable resource for studies into the molecular phylogeny of these organisms and the evolution of neuropeptide hormones. |
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1039 |
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Bachelor's thesis |
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1932-6203 |
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yes |
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4503 |
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Title |
Sympatric Breeding Auks Shift between Dietary and Spatial Resource Partitioning across the Annual Cycle
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Type |
Journal Article |
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Year |
2013 |
Publication |
PLOS ONE |
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8 |
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8 |
Pages |
e72987 |
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388 |
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1932-6203 |
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yes |
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4540 |
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Jaouen Klervia, Gibert Morgane, Lamboux Aline, Telouk Philippe, Fourel Francois, Albarede Francis, Alekseev Anatoly N, Crubezy Eric, Balter Vincent, |
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Title |
Is aging recorded in blood Cu and Zn isotope compositions?
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Journal Article |
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Year |
2013 |
Publication |
Metallomics |
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5 |
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8 |
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1016-1024 |
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Recent isotopic observations of animal samples indicate body accumulation of heavy zinc and light copper throughout life. This hypothesis has never been tested for humans, but the existence of a relationship between blood isotopic composition and age could be promising for age assessment methodologies. Dietary habits can also influence the blood zinc isotope composition, being an additional source of isotopic variation. In order to reduce this putative source of variation, we selected a population living in an isolated area (Sakha Republic, Russia) where diverse foods are of limited availability. We sampled blood from 8 male and 31 female Yakut volunteers between the ages of 18 and 74. Zinc, iron and copper were purified by liquid chromatography on ion exchange resin and their stable isotope ratios were measured using multiple-collector inductively coupled plasma mass spectrometry. According to observations of animal samples, the 66Zn/64Zn ratio increases with age. We also observe that the 65Cu/63Cu ratio decreases with age, whereas iron isotopic compositions are unrelated to age. The copper and zinc isotope compositions of the Yakut's blood are significantly lighter and heavier, respectively, than in samples of European and Japanese populations. The Yakut is a circumpolar population in which individuals have an elevated basal metabolic rate in response to cold stress. This elevated basal metabolic rate could enhance copper and zinc isotopic fractionation by accelerating the turnover of the copper and zinc stores.
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1038 |
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The Royal Society of Chemistry |
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1756-5901 |
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yes |
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4693 |
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Title |
A Space Oddity: Geographic and Specific Modulation of Migration in Eudyptes Penguins
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Type |
Journal Article |
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Year |
2013 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
8 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
8 |
Pages |
e71429- |
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109 |
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Public Library of Science |
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1932-6203 |
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yes |
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Serial |
4764 |
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Title |
Invasion Dynamics of a Fish-Free Landscape by Brown Trout (Salmo trutta) |
Type |
Journal |
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Year |
2013 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
8 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
8 |
Pages |
e71052- |
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Metapopulation dynamics over the course of an invasion are usually difficult to grasp because they require large and reliable data collection, often unavailable. The invasion of the fish-free freshwater ecosystems of the remote sub-Antarctic Kerguelen Islands following man-made introductions of brown trout (Salmo trutta) in the 1950's is an exception to this rule. Benefiting from a full long term environmental research monitoring of the invasion, we built a Bayesian dynamic metapopulation model to analyze the invasion dynamics of 85 river systems over 51 years. The model accounted for patch size (river length and connections to lakes), alternative dispersal pathways between rivers, temporal trends in dynamics, and uncertainty in colonization date. The results show that the model correctly represents the observed pattern of invasion, especially if we assume a coastal dispersal pathway between patches. Landscape attributes such as patch size influenced the colonization function, but had no effect on propagule pressure. Independently from patch size and distance between patches, propagule pressure and colonization function were not constant through time. Propagule pressure increased over the course of colonization, whereas the colonization function decreased, conditional on propagule pressure. The resulting pattern of this antagonistic interplay is an initial rapid invasion phase followed by a strong decrease in the invasion rate. These temporal trends may be due to either adaptive processes or environmental gradients encountered along the colonization front. It was not possible to distinguish these two hypotheses. Because invasibility of Kerguelen Is. freshwater ecosystems is very high due to the lack of a pre-existing fish fauna and minimal human interference, our estimates of invasion dynamics represent a blueprint for the potential of brown trout invasiveness in pristine environments. Our conclusions shed light on the future of polar regions where, because of climate change, fish-free ecosystems become increasingly accessible to invasion by fish species. |
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Programme |
1041 |
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Thesis |
Bachelor's thesis |
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Publisher |
Public Library of Science |
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1932-6203 |
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yes |
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Call Number |
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Serial |
4781 |
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Title |
Is the Species Flock Concept Operational? The Antarctic Shelf Case
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Type |
Journal Article |
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Year |
2013 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
8 |
Issue ![sorted by Issue field, descending order (down)](img/sort_desc.gif) |
8 |
Pages |
e68787- |
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1124 |
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Public Library of Science |
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1932-6203 |
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yes |
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Call Number |
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Serial |
4828 |
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Title |
Age, sex, and breeding status shape a complex foraging pattern in an extremely long-lived seabird
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Journal Article |
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2014 |
Publication |
Ecology |
Abbreviated Journal |
Ecology |
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95 |
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8 |
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2324-2333 |
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109 |
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Ecological Society of America |
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0012-9658 |
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yes |
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5067 |
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Author |
Jenouvrier Stephanie, Holland Marika, Stroeve Julienne, Serreze Mark, Barbraud Christophe, Weimerskirch Henri, Caswell Hal, |
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Title |
Projected continent-wide declines of the emperor penguin under climate change
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Journal Article |
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Year |
2014 |
Publication |
Nature Climate Change |
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4 |
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715-718 |
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Climate change has been projected to affect species distribution1 and future trends of local populations2, 3, but projections of global population trends are rare. We analyse global population trends of the emperor penguin (Aptenodytes forsteri), an iconic Antarctic top predator, under the influence of sea ice conditions projected by coupled climate models assessed in the Intergovernmental Panel on Climate Change (IPCC) effort4. We project the dynamics of all 45 known emperor penguin colonies5 by forcing a sea-ice-dependent demographic model6, 7 with local, colony-specific, sea ice conditions projected through to the end of the twenty-first century. Dynamics differ among colonies, but by 2100 all populations are projected to be declining. At least two-thirds are projected to have declined by >50% from their current size. The global population is projected to have declined by at least 19%. Because criteria to classify species by their extinction risk are based on the global population dynamics8, global analyses are critical for conservation9. We discuss uncertainties arising in such global projections and the problems of defining conservation criteria for species endangered by future climate change. |
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109 |
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Nature Publishing Group |
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1758-678X |
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5153 |
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Author |
Legrand M, Preunkert S, Frey M, Bartels-Rausch T, Kukui A, King M D, Savarino J, Kerbrat M, Jourdain B, |
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Title |
Large mixing ratios of atmospheric nitrous acid (HONO) at Concordia (East Antarctic plateau) in summer: a strong source from surface snow?
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Journal Article |
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Year |
2014 |
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Atmos. Chem. Phys. Discuss. |
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Volume |
14 |
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8 |
Pages |
11749-11785 |
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903 |
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Copernicus Publications |
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1680-7375 |
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yes |
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5195 |
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Title |
Separation of the Geodetic Consequences of Past and Present Ice-Mass Change: Influence of Topography with Application to Svalbard (Norway) |
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2012 |
Publication |
Pure and applied geophysics |
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169 |
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8 |
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1357-1372 |
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337 |
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1420-9136 |
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yes |
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Call Number |
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4366 |
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