| |
Records |
Links |
|
Author |
Patrick Samantha C., Pinaud David, Weimerskirch Henri, Morand?Ferron Julie |
|
| |
Title |
|
Type |
Journal |
| |
Year |
2017 |
Publication |
Journal of Animal Ecology |
Abbreviated Journal |
|
|
| |
Volume |
86 |
Issue |
5 |
Pages |
1257-1268 |
|
| |
Keywords |
albatrosses area?restricted search first passage time marginal value theorem personality seabirds |
|
| |
Abstract |
Abstract Individuals do not have complete information about the environment and therefore they face a trade?off between gathering information (exploration) and gathering resources (exploitation). Studies have shown individual differences in components of this trade?off but how stable these strategies are in a population and the intrinsic drivers of these differences is not well understood. Top marine predators are expected to experience a particularly strong trade?off as many species have large foraging ranges and their prey often have a patchy distribution. This environment leads these species to exhibit pronounced exploration and exploitation phases but differences between individuals are poorly resolved. Personality differences are known to be important in foraging behaviour but also in the trade?off between exploration and exploitation. Here we test whether personality predicts an individual exploration?exploitation strategy using wide ranging wandering albatrosses (Diomedea exulans) as a model system. Using GPS tracking data from 276 wandering albatrosses, we extract foraging parameters indicative of exploration (searching) and exploitation (foraging) and show that foraging effort, time in patch and size of patch are strongly correlated, demonstrating these are indicative of an exploration?exploitation (EE) strategy. Furthermore, we show these are consistent within individuals and appear stable in the population, with no reproductive advantage. The searching and foraging behaviour of bolder birds placed them towards the exploration end of the trade?off, whereas shy birds showed greater exploitation. This result provides a mechanism through which individual foraging strategies may emerge. Age and sex affected components of the trade?off, but not the trade?off itself, suggesting these factors may drive behavioural compensation to maintain resource acquisition and this was supported by the evidence that there were no fitness consequence of any EE trait nor the trade?off itself. These results demonstrate a clear trade?off between information gathering and exploitation of prey patches, and reveals for the first time that boldness may drive these differences. This provides a mechanism through which widely reported links between personality and foraging may emerge. |
|
| |
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 |
0021-8790 |
ISBN  |
0021-8790 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
6663 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Climate change and functional traits affect population dynamics of a long-lived seabird |
Type |
Journal |
| |
Year |
2018 |
Publication |
Journal of Animal Ecology |
Abbreviated Journal |
|
|
| |
Volume |
87 |
Issue |
4 |
Pages |
906-920 |
|
| |
Keywords |
birds climate change foraging behaviours non-breeding season phenotypic traits pre-breeding season timing of breeding wing length |
|
| |
Abstract |
Abstract Recent studies unravelled the effect of climate changes on populations through their impact on functional traits and demographic rates in terrestrial and freshwater ecosystems, but such understanding in marine ecosystems remains incomplete. Here, we evaluate the impact of the combined effects of climate and functional traits on population dynamics of a long-lived migratory seabird breeding in the southern ocean: the black-browed albatross (Thalassarche melanophris, BBA). We address the following prospective question: ?Of all the changes in the climate and functional traits, which would produce the biggest impact on the BBA population growth rate?? We develop a structured matrix population model that includes the effect of climate and functional traits on the complete BBA life cycle. A detailed sensitivity analysis is conducted to understand the main pathway by which climate and functional trait changes affect the population growth rate. The population growth rate of BBA is driven by the combined effects of climate over various seasons and multiple functional traits with carry-over effects across seasons on demographic processes. Changes in sea surface temperature (SST) during late winter cause the biggest changes in the population growth rate, through their effect on juvenile survival. Adults appeared to respond to changes in winter climate conditions by adapting their migratory schedule rather than by modifying their at-sea foraging activity. However, the sensitivity of the population growth rate to SST affecting BBA migratory schedule is small. BBA foraging activity during the pre-breeding period has the biggest impact on population growth rate among functional traits. Finally, changes in SST during the breeding season have little effect on the population growth rate. These results highlight the importance of early life histories and carry-over effects of climate and functional traits on demographic rates across multiple seasons in population response to climate change. Robust conclusions about the roles of various phases of the life cycle and functional traits in population response to climate change rely on an understanding of the relationships of traits to demographic rates across the complete life cycle. |
|
| |
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 |
0021-8790 |
ISBN |
0021-8790 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7122 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
G. Hubert |
|
| |
Title |
Ground Albedo Neutron Impacts to Seasonal Variations of Cosmic-Ray-Induced Neutron in Medium Geomagnetic Latitude and Antarctica: Impacts on Soft Error Rate |
Type |
Journal |
| |
Year |
2017 |
Publication |
IEEE Transactions on Nuclear Science |
Abbreviated Journal |
|
|
| |
Volume |
64 |
Issue |
1 |
Pages |
622-629 |
|
| |
Keywords |
albedo Antarctica ATMORAD Atmospheric modeling atmospheric shower modeling chemical rock composition Concordia cosmic ray apparatus cosmic ray neutrons cosmic ray showers Cosmic-ray induced neutrons cosmic-ray-induced neutron density epithermal domain evaporation domain evaporation neutron contribution GEANT4 GEANT4 simulations geochemistry ground albedo neutron ground albedo neutron impacts high-altitude stations high-sensitive technologies hydrogen content medium geomagnetic latitude modeling methodology neutron measurements neutron spectrum Neutrons nuclear electronics Pic-du-Midi Protons radiation hardening (electronics) rocks seasonal variations Single Event Rate Snow snow pack soft error rate soil Soil soil characteristics terrestrial radiation field water content |
|
| |
Abstract |
This paper investigates the impact of ground albedo neutrons in the terrestrial radiation field and their seasonal variations. A modeling methodology is proposed, it is based on ATMORAD (atmospheric shower modeling) and GEANT4 simulations taking into account the soil characteristics and hydrogen content. This method was validated thanks to neutron measurements performed in two high altitude stations located in medium geomagnetic latitude and Antarctica (Pic-du-Midi and Concordia, respectively). Thus, the chemical rock composition, the density, the water content and the snow pack impacts to neutron spectrum were investigated. Simulated and measured spectra were compared. Analyses show that variations are dominant in the thermal domain (i.e. En <;0.5 eV) and lesser degree in epithermal and evaporation domains (i.e. 0.5 eV <; En <;0.1 MeV and 0.1 MeV <; En <;20 MeV, respectively). The last part investigates the impact induced by the evaporation neutron contribution to Single Event Rate (more impacted by the ground albedo neutron). Results show that evaporation neutrons contribution to the total SER should be assessed for high-sensitive technologies. |
|
| |
Programme |
1112 |
|
| |
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 |
0018-9499 |
ISBN |
0018-9499 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
6721 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
|
Type |
Journal |
| |
Year |
2011 |
Publication |
La Houille Blanche |
Abbreviated Journal |
|
|
| |
Volume |
|
Issue |
5 |
Pages |
20-28 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
1108 |
|
| |
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 |
0018-6368, 1958-5551 |
ISBN |
0018-6368, 1958-5551 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
6969 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Socially-induced variation in physiological mediators of parental care in a colonial bird |
Type |
Journal |
| |
Year |
2017 |
Publication |
Hormones and Behavior |
Abbreviated Journal |
|
|
| |
Volume |
93 |
Issue |
|
Pages |
39-46 |
|
| |
Keywords |
Antioxidants Ecophysiology Hormones Parental care Social environment Sociophysiology |
|
| |
Abstract |
|
|
| |
Programme |
1091 |
|
| |
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 |
0018-506X |
ISBN |
0018-506X |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
6895 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
An integrative appraisal of the hormonal and metabolic changes induced by acute stress using king penguins as a model |
Type |
Journal |
| |
Year |
2017 |
Publication |
General and Comparative Endocrinology |
Abbreviated Journal |
|
|
| |
Volume |
|
Issue |
|
Pages |
|
|
| |
Keywords |
Allostasis Cortisol Homeostasis Metabolism Reactive scope Seabird |
|
| |
Abstract |
|
|
| |
Programme |
119 |
|
| |
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 |
0016-6480 |
ISBN |
0016-6480 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
6796 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Do glucocorticoids mediate the link between environmental conditions and telomere dynamics in wild vertebrates? A review |
Type |
Journal |
| |
Year |
2018 |
Publication |
General and Comparative Endocrinology |
Abbreviated Journal |
|
|
| |
Volume |
256 |
Issue |
|
Pages |
99-111 |
|
| |
Keywords |
Corticosterone Cortisol HPA axis Oxidative stress Stress Telomerase Telomere |
|
| |
Abstract |
Following the discoveries of telomeres and of their implications in terms of health and ageing, there has been a growing interest into the study of telomere dynamics in wild vertebrates. Telomeres are repeated sequences of non-coding DNA located at the terminal ends of chromosomes and they play a major role in maintaining chromosome stability. Importantly, telomeres shorten over time and shorter telomeres seem to be related with lower survival in vertebrates. Because of this potential link with longevity, it is crucial to understand not only the ecological determinants of telomere dynamics but also the regulatory endocrine mechanisms that may mediate the effect of the environment on telomeres. In this paper, we review the relationships that link environmental conditions, glucocorticoids (GC, the main hormonal mediator of allostasis) and telomere length in vertebrates. First, we review current knowledge about the determinants of inter-individual variations in telomere length. We emphasize the potential strong impact of environmental stressors and predictable life-history events on telomere dynamics. Despite recent progress, we still lack crucial basic data to fully understand the costs of several life-history stages and biotic and abiotic factors on telomere length. Second, we review the link that exists between GCs, oxidative stress and telomere dynamics in vertebrates. Although circulating GC levels may be closely and functionally linked with telomere dynamics, data are still scarce and somewhat contradictory. Further laboratory and field studies are therefore needed not only to better assess the proximate link between GC levels and telomere dynamics, but also to ultimately understand to what extent GCs and telomere length could be informative to measure the fitness costs of specific life-history stages and environmental conditions. Finally, we highlight the importance of exploring the functional links that may exist between coping styles, the GC stress response, and telomere dynamics in a life-history framework. To conclude, we raise new hypotheses regarding the potential of the GC stress response to drive the trade-off between immediate survival and telomere protection. |
|
| |
Programme |
109,330 |
|
| |
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 |
0016-6480 |
ISBN |
0016-6480 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7110 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
An integrative appraisal of the hormonal and metabolic changes induced by acute stress using king penguins as a model |
Type |
Journal |
| |
Year |
2018 |
Publication |
General and Comparative Endocrinology |
Abbreviated Journal |
|
|
| |
Volume |
269 |
Issue |
|
Pages |
1-10 |
|
| |
Keywords |
Allostasis Cortisol Homeostasis Metabolism Reactive scope Seabird |
|
| |
Abstract |
|
|
| |
Programme |
119 |
|
| |
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 |
0016-6480 |
ISBN |
0016-6480 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7375 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Contaminants, prolactin and parental care in an Arctic seabird: Contrasted associations of perfluoroalkyl substances and organochlorine compounds with egg-turning behavior |
Type |
Journal |
| |
Year |
2020 |
Publication |
General and comparative endocrinology |
Abbreviated Journal |
|
|
| |
Volume |
291 |
Issue |
|
Pages |
113420 |
|
| |
Keywords |
Black-legged kittiwake Corticosterone Egg-loggers Incubation behaviors Mercury Organochlorine compounds Perfluoroalkyl substances Prolactin |
|
| |
Abstract |
Incubating eggs represents a trade-off for parent birds between spending enough time fasting to take care of the clutch and to get enough nutrients for self-maintenance. It is believed that the pituitary hormone prolactin plays an important role in such allocation processes. Incubation does not solely imply the active warming of the eggs but also the active egg-turning to facilitate absorption of albumen by the embryo, reduce malposition and prevent the embryo from adhering to the inner shell membrane. However, how prolactin secretion is related to egg-turning behaviors is presently poorly addressed. In addition, several environmental contaminants can affect parental care behaviors through their endocrine disrupting properties but the effects of such contaminants on egg-turning behaviors remain so far unexplored. Using artificial eggs equipped with miniaturized data loggers, we investigated the relationships between egg-turning behaviors, prolactin secretion and contaminants burden in Arctic black-legged kittiwakes (Rissa tridactyla). Specifically, we examined the relationships between blood concentrations of poly- and perfluoroalkyl substances (PFASs), organochlorines (OCs), mercury (Hg), plasma prolactin levels and both egg-turning frequency and angular change. We also incorporated baseline corticosterone levels since this glucocorticoid is known to affect parental care. Plasma prolactin levels were positively related to angular change in female kittiwakes while corticosterone was not related to egg-turning behaviors in either sex. Hg was not related to egg-turning behaviors in either sex. We found contrasting associations between OCs and PFASs, since polychlorinated biphenyls (PCBs) were negatively associated with angular change in females, contrary to linear perfluorooctanesulfonate (PFOSlin) and perfluoroalkyl carboxylic acids (PFCAs) which were positively related to egg-turning frequency and angular change in both sexes. Additionally, PFASs concentrations were positively related to prolactin levels in female kittiwake. The possible stimulation of prolactin secretion by PFASs could therefore make adult kittiwakes to allocate more time taking care of their eggs, and thus possibly modify the trade-off between spending enough time caring for the clutch and obtaining enough nutrients at sea. |
|
| |
Programme |
330 |
|
| |
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 |
0016-6480 |
ISBN |
0016-6480 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
7628 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Evidence of reduced individual heterogeneity in adult survival of long?lived species |
Type |
Journal |
| |
Year |
2016 |
Publication |
Evolution |
Abbreviated Journal |
|
|
| |
Volume |
70 |
Issue |
12 |
Pages |
2909-2914 |
|
| |
Keywords |
Capture?recapture comparative analyses individual differences life?history evolution mixture models random?effect models vertebrates |
|
| |
Abstract |
The canalization hypothesis postulates that the rate at which trait variation generates variation in the average individual fitness in a population determines how buffered traits are against environmental and genetic factors. The ranking of a species on the slow?fast continuum ? the covariation among life?history traits describing species?specific life cycles along a gradient going from a long life, slow maturity, and low annual reproductive output, to a short life, fast maturity, and high annual reproductive output ? strongly correlates with the relative fitness impact of a given amount of variation in adult survival. Under the canalization hypothesis, long?lived species are thus expected to display less individual heterogeneity in survival at the onset of adulthood, when reproductive values peak, than short?lived species. We tested this life?history prediction by analysing long?term time series of individual?based data in nine species of birds and mammals using capture?recapture models. We found that individual heterogeneity in survival was higher in species with short?generation time (< 3 years) than in species with long generation time (> 4 years). Our findings provide the first piece of empirical evidence for the canalization hypothesis at the individual level from the wild. |
|
| |
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 |
0014-3820 |
ISBN |
0014-3820 |
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
6625 |
|
| Permanent link to this record |
