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Title |
Apparent changes in body insulation of juvenile king penguins suggest an energetic challenge during their early life at sea |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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Year |
2017 |
Publication |
Journal of experimental biology |
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Volume |
220 |
Issue |
14 |
Pages |
2666-2678 |
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Abstract |
Skip to Next Section Little is known about the early life at sea of marine top predators, like deep-diving king penguins (Aptenodytes patagonicus), although this dispersal phase is probably a critical phase in their life. Apart from finding favourable foraging sites, they have to develop effective prey search patterns as well as physiological capacities that enable them to capture sufficient prey to meet their energetic needs. To investigate the ontogeny of their thermoregulatory responses at sea, we implanted 30 juvenile king penguins and 8 adult breeders with a small data logger that recorded pressure and subcutaneous temperature continuously for up to 2.5 years. We found important changes in the development of peripheral temperature patterns of foraging juvenile king penguins throughout their first year at sea. Peripheral temperature during foraging bouts fell to increasingly lower levels during the first 6 months at sea, after which it stabilized. Most importantly, these changes re-occurred during their second year at sea, after birds had fasted for ?4 weeks on land during their second moult. Furthermore, similar peripheral temperature patterns were also present in adult birds during foraging trips throughout their breeding cycle. We suggest that rather than being a simple consequence of concurrent changes in dive effort or an indication of a physiological maturation process, these seasonal temperature changes mainly reflect differences in thermal insulation. Heat loss estimates for juveniles at sea were initially high but declined to approximately half after ?6 months at sea, suggesting that juvenile king penguins face a strong energetic challenge during their early oceanic existence. |
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109,137,394 |
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Bachelor's thesis |
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0022-0949, 1477-9145 |
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0022-0949, 1477-9145 |
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yes |
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6587 |
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Lebouvier M., Barbraud C., Chapuis J.-L., Delord K., Fourcy D., Guinet C., Ropert-Coudert Y. |
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136 |
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yes |
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6615 |
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Title |
Sectorial land snail damage to the lichen Argopsis friesiana could be explained by metabolite profiles |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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2016 |
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Joint natural products conference, copenhague, danemark, 24-27/07/2016 |
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136 |
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yes |
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6619 |
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Title |
Flights of drones over sub-Antarctic seabirds show species- and status-specific behavioural and physiological responses |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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2017 |
Publication |
Polar Biology |
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41 |
Issue |
2 |
Pages |
259-266 |
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109,119 |
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Bachelor's thesis |
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0722-4060, 1432-2056 |
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0722-4060, 1432-2056 |
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yes |
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6666 |
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Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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2017 |
Publication |
The Cryosphere |
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Volume |
11 |
Issue |
1 |
Pages |
343-362 |
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411,414,1154 |
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Bachelor's thesis |
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1994-0424 |
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1994-0424 |
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yes |
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6672 |
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Author |
Duran-alarcon C., A. Berne A, B. Boudevillan, C. Genthon, Et J. Grazioli |
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Title |
Multi-instrumental observations of solid precipitation at Dumont D'Urville, Antarctica |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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2017 |
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1143 |
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Bachelor's thesis |
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yes |
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6675 |
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Title |
Antarctica-Regional Climate and Surface Mass Budget |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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2017 |
Publication |
Current Climate Change Reports |
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Volume |
3 |
Issue |
4 |
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303-315 |
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Abstract |
We review recent literature on atmospheric, surface ocean and sea-ice observations and modeling results in the Antarctic sector and relate the observed climatic trends with the potential changes in the surface mass balance (SMB) of the ice sheet since 1900. Estimates of regional scale SMB distribution and trends remain subject to large uncertainties. Approaches combining and comparing multiple satellite and model-based assessments of ice sheet mass balance aim at reducing these knowledge gaps. During the last decades, significant changes in atmospheric circulation occurred around Antarctica, due to the exceptional positive trend in the Southern Annular Mode and to the climate variability observed in the tropical Pacific at the end of the twentieth century. Even though climate over the East Antarctic Ice-Sheet remained quite stable, a warming and precipitation increase was observed over the West Antarctic Ice-Sheet and over the West Antarctic Peninsula (AP) during the twentieth century. However, the high regional climate variability overwhelms climate changes associated to human drivers of global temperature changes, as reflected by a slight recent decadal cooling trend over the AP. Climate models still fail to accurately reproduce the multi-decadal SMB trends at a regional scale, and progress has to be achieved in reproducing atmospheric circulation changes related to complex ocean/ice/atmosphere interactions. Complex processes are also still insufficiently considered, such as (1) specific polar atmospheric processes (clouds, drifting snow, and stable boundary layer physics), (2) surface firn physics involved in the surface drag variations, or in firn air depletion and albedo feedbacks. Finally, progress in reducing the uncertainties relative to projections of the future SMB of Antarctica will largely depend on climate model capability to correctly consider teleconnections with low and mid-latitudes, and on the ability to correct them for biases, taking into account the coupling between ocean, ice, and atmosphere in high southern latitudes. |
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411,1154 |
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Bachelor's thesis |
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2198-6061 |
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2198-6061 |
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yes |
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6735 |
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Title |
Interpreting ELISA analyses from wild animal samples: Some recurrent issues and solutions |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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Year |
2017 |
Publication |
Functional Ecology |
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31 |
Issue |
12 |
Pages |
2255-2262 |
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Programme |
333,1151 |
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Bachelor's thesis |
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0269-8463 |
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0269-8463 |
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yes |
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6740 |
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Author |
Sarah Kada, Karen D. McCoy, Thierry Boulinier |
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Title |
Impact of life stage-dependent dispersal on the colonization dynamics of host patches by ticks and tick-borne infectious agents |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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Year |
2017 |
Publication |
Parasites & Vectors |
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Volume |
10 |
Issue |
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Pages |
375 |
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Keywords |
Allee effect Borrelia burgdorferi Climate change Ixodes uriae Lyme disease Ornithodoros maritimus Parasite spread Range expansion Vertical transmission |
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Abstract |
When colonization and gene flow depend on host-mediated dispersal, a key factor affecting vector dispersal potential is the time spent on the host for the blood meal, a characteristic that can vary strongly among life history stages. Using a 2-patch vector-pathogen population model and seabird ticks as biological examples, we explore how vector colonization rates and the spread of infectious agents may be shaped by life stage-dependent dispersal. We contrast hard (Ixodidae) and soft (Argasidae) tick systems, which differ strongly in blood- feeding traits. |
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333,1151 |
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Bachelor's thesis |
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ISSN |
1756-3305 |
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1756-3305 |
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yes |
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Call Number |
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Serial |
6742 |
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Title |
Recent evolutions of the GEOSCOPE broadband seismic observatory |
Type ![sorted by Type field, ascending order (up)](img/sort_asc.gif) |
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Year |
2017 |
Publication |
19th EGU General Assembly, EGU2017, proceedings from the conference, 23-28 April, 2017 Vienna, Austria, p.15087 |
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133 |
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Bachelor's thesis |
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yes |
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6782 |
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