Výsledky vyhledávání - "Agnès Lewden"

Akademický článek

Intra-seasonal flexibility in avian metabolic performance highlights the uncoupling of basal metabolic rate and thermogenic capacity.

Autor: Magali Petit, Agnès Lewden, François Vézina

Publikováno v: PLoS ONE, Vol 8, Iss 6, p e68292 (2013)

Stochastic winter weather events are predicted to increase in occurrence and amplitude at northern latitudes and organisms are expected to cope through phenotypic flexibility. Small avian species wintering in these environments show acclimatization w

Externí odkaz: https://doaj.org/article/a027614c1c97460b895971f4af87642b

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Body surface rewarming in fully and partially hypothermic king penguins

Autor: André Ancel, Batshéva Bonnet, Andreas Nord, Dominic J. McCafferty, Florent Chauvet, Agnès Lewden

Publikováno v: Journal of Comparative Physiology B
Journal of Comparative Physiology B, Springer Verlag, 2020, 190, pp.597-609. ⟨10.1007/s00360-020-01294-1⟩
Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology; (2020)

Penguins face a major thermal transition when returning to land in a hypothermic state after a foraging trip. Uninsulated appendages (flippers and feet) could provide flexible heat exchange during subsequent rewarming. Here, we tested the hypothesis

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1640a6ba3f308715ed1690434637f497
https://doi.org/10.1007/s00360-020-01294-1

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The metabolic cost of subcutaneous and abdominal rewarming in king penguins after long-term immersion in cold water

Autor: Batshéva Bonnet, Andreas Nord, Agnès Lewden

Publikováno v: Journal of Thermal Biology
Journal of Thermal Biology, Elsevier, 2020, 91, pp.102638-. ⟨10.1016/j.jtherbio.2020.102638⟩

Marine endotherms in the polar regions face a formidable thermal challenge when swimming in cold water. Hence, they use morphological (fat, blubber) adjustment and peripheral vasoconstriction to reduce demands for heat production in water. The animal

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f8a8a84025007262fd371d29c9bfe9e
https://hal.archives-ouvertes.fr/hal-03491429

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Individual inconsistencies in basal and summit metabolic rate highlight flexibility of metabolic performance in a wintering passerine

Autor: Agnès Lewden, Myriam Milbergue, Pablo Cortés, François Vézina, Magali Petit

Publikováno v: Journal of Experimental Zoology Part A: Ecological Genetics and Physiology. 323:179-190

Resident passerines inhabiting high latitude environments are faced with strong seasonal changes in thermal conditions and energy availability. Summit metabolic rate (maximal metabolic rate elicited by shivering during cold exposure: M(sum)) and basa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ff9c08ca5b80ceeb33bbf4582cf368ac
https://doi.org/10.1002/jez.1908

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Thermal strategies of king penguins during prolonged fasting in water

Autor: Manfred R. Enstipp, Jean-Yves Georges, Agnès Lewden, C. A. Bost, Yves Handrich, Batshéva Bonnet

Publikováno v: Journal of Experimental Biology
Journal of Experimental Biology, Cambridge University Press, 2017, 220 (24), pp.4600-4611. ⟨10.1242/jeb.168807⟩
Journal of Experimental Biology, The Company of Biologists, 2017, 220 (24), pp.4600-4611. ⟨10.1242/jeb.168807⟩

International audience; Most animals experience periods of unfavourable conditions, challenging their daily energy balance. During breeding, king penguins fast voluntarily for up to 1.5 months in the colony, after which they replenish their energy st

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac32d79f0d79a58a49009546de0ab7a8
https://hal.archives-ouvertes.fr/hal-01684107

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High peripheral temperatures in king penguins while resting at sea: thermoregulation versus fat deposition

Autor: Manfred R. Enstipp, Tessa A. van Walsum, Agnès Lewden, Baptiste Picard, Yves Handrich

Publikováno v: Journal of Experimental Biology
Journal of Experimental Biology, The Company of Biologists, 2017, 220 (17), pp.3084-3094. ⟨10.1242/jeb.158980⟩
Journal of Experimental Biology, Cambridge University Press, 2017, 220 (17), pp.3084-3094. ⟨10.1242/jeb.158980⟩

International audience; Marine endotherms living in cold water face an energetically challenging situation. Unless properly insulated, these animals will lose heat rapidly. The field metabolic rate of king penguins at sea is about twice that on land.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f2abeacc634f282e85d869d965512508
https://hal.archives-ouvertes.fr/hal-01684117

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Evidence of facultative daytime hypothermia in a small passerine wintering at northern latitudes

Autor: Stéphane Orio, François Vézina, Agnès Lewden, Magali Petit, Myriam Milbergue

Publikováno v: Ibis. 156:321-329

The use of hypothermia as a means to save energy is well documented in birds. This energy-saving strategy is widely considered to occur exclusively at night in diurnally active species. However, recent studies suggest that facultative hypothermia may

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b154806f1160b9527ae2d6efc09879d0
https://doi.org/10.1111/ibi.12142

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Body temperature responses to handling stress in wintering Black-capped Chickadees (Poecile atricapillus L.)

Autor: Agnès Lewden, Andreas Nord, François Vézina, Magali Petit

Publikováno v: Physiologybehavior. 179

Body temperature variation in response to acute stress is typically characterized by peripheral vasoconstriction and a concomitant increase in core body temperature (stress-induced hyperthermia). It is poorly understood how this response differs betw

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62e31c39d245d7aefb7cef9c1fc82a12
https://pubmed.ncbi.nlm.nih.gov/28528893

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Species-specific foraging strategies and segregation mechanisms of sympatric Antarctic fulmarine petrels throughout the annual cycle

Autor: Sophie de Grissac, Henri Weimerskirch, David Pinaud, Patrick Pinet, Yves Cherel, Karine Delord, Agnès Lewden, Christophe Barbraud

Publikováno v: Ibis
Ibis, Wiley, 2016, 158, pp.569-586. ⟨10.1111/ibi.12365⟩

International audience; Determining the year-round distribution and behaviour of birds is necessary for a betterunderstanding of their ecology and foraging strategies. Petrels form an important componentof the high-latitude seabird assemblages in ter

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::274dfbc91e48b2e6a89ae18f7fef3070
https://hal.archives-ouvertes.fr/hal-01302388

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Dominant black-capped chickadees pay no maintenance energy costs for their wintering status and are not better at enduring cold than subordinate individuals

Autor: François Vézina, Magali Petit, Agnès Lewden

Publikováno v: Journal of Comparative Physiology B. 182:381-392

Winter requires physiological adjustments in northern resident passerines. Cold acclimatization is generally associated with an increase in physiological maintenance costs, measured as basal metabolic rate (BMR), and cold endurance, reflected by summ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d116184f0f79c0f662e67bac360ea31
https://doi.org/10.1007/s00360-011-0625-8

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