Check out my profile on Research Gate and on Google Scholar or explore my full publication list below. Most papers are available online through the public repository at HAL CNRS
2023
2.
Mathias Dezetter; Jean-François Le Galliard; Olivier Lourdais
Behavioural hydroregulation protects against acute effects of drought in a dry-skinned ectotherm Journal Article
In: Oecologia, 2023, ISSN: 1432-1939.
Abstract | Links | BibTeX | Tags: behaviour, hydroregulation
@article{dezetter_behavioural_2022,
title = {Behavioural hydroregulation protects against acute effects of drought in a dry-skinned ectotherm},
author = {Mathias Dezetter and Jean-François Le Galliard and Olivier Lourdais},
url = {https://doi.org/10.1007/s00442-022-05299-1},
doi = {10.1007/s00442-022-05299-1},
issn = {1432-1939},
year = {2023},
date = {2023-01-02},
urldate = {2022-12-01},
journal = {Oecologia},
abstract = {During extreme climate events, behavioural thermoregulation may buffer ectotherms from thermal stress and overheating. However, heatwaves are also combined with dry spells and limited water availability, and how much individuals can behaviourally mitigate dehydration risks through microclimate selection remains largely unknown. Herein, we investigated the behavioural and physiological responses to changes in air and microhabitat humidity in a terrestrial ectotherm, the asp viper (Vipera aspis). We exposed individuals to a simulated heatwave together with water deprivation for 3 weeks, and manipulated air water vapour density (wet air vs. dry air) and microclimate (wet shelter vs. dry shelter) in a two-by-two factorial design. Dry air conditions led to substantial physiological dehydration and muscle wasting. Vipers exposed to dry air used more often a shelter that offered a moist microclimate, which reduced dehydration and muscle wasting at the individual level. These results provide the first experimental evidence that active behavioural hydroregulation can mitigate specific physiological stress responses caused by a dry spell in an ectotherm. Future studies investigating organismal responses to climate change should consider moisture gradient in the habitat and integrate both hydroregulation and thermoregulation behaviours.},
keywords = {behaviour, hydroregulation},
pubstate = {published},
tppubtype = {article}
}
During extreme climate events, behavioural thermoregulation may buffer ectotherms from thermal stress and overheating. However, heatwaves are also combined with dry spells and limited water availability, and how much individuals can behaviourally mitigate dehydration risks through microclimate selection remains largely unknown. Herein, we investigated the behavioural and physiological responses to changes in air and microhabitat humidity in a terrestrial ectotherm, the asp viper (Vipera aspis). We exposed individuals to a simulated heatwave together with water deprivation for 3 weeks, and manipulated air water vapour density (wet air vs. dry air) and microclimate (wet shelter vs. dry shelter) in a two-by-two factorial design. Dry air conditions led to substantial physiological dehydration and muscle wasting. Vipers exposed to dry air used more often a shelter that offered a moist microclimate, which reduced dehydration and muscle wasting at the individual level. These results provide the first experimental evidence that active behavioural hydroregulation can mitigate specific physiological stress responses caused by a dry spell in an ectotherm. Future studies investigating organismal responses to climate change should consider moisture gradient in the habitat and integrate both hydroregulation and thermoregulation behaviours.
2009
1.
Katrine Hoset; Jean-François Le Galliard; Gry Gundersen
Demographic responses to a mild winter in enclosed vole populations Journal Article
In: Population Ecology, vol. 51, no. 2, pp. 279–288, 2009, ISSN: 1438-3896.
Abstract | Links | BibTeX | Tags: behaviour, climate change, food, Microtus oeconomus, small mammals, small mammals, small mammals, small mammals, space use, survival
@article{hoset_demographic_2009,
title = {Demographic responses to a mild winter in enclosed vole populations},
author = {Katrine Hoset and Jean-François Le Galliard and Gry Gundersen},
url = {http:ws.isiknowledge.comcpsøpenurlservice?url_ver=Z39.88-2004&rft_id=info:ut000264328900007},
doi = {DOI: 10.1007/s10144-008-0130-4},
issn = {1438-3896},
year = {2009},
date = {2009-01-01},
journal = {Population Ecology},
volume = {51},
number = {2},
pages = {279--288},
abstract = {Mild winter weather causing snow to melt and ice to accumulate on the ground has been proposed to cause the decreased survival of individuals, and less pronounced cyclicity, of small rodent populations in Fennoscandia. However, detailed data linking ice accumulation to decreased winter survival is lacking. We live-trapped and monitored with passive integrated transponders enclosed populations of root voles (Microtus oeconomus) exposed to different amounts of ice accumulation through a mild winter. We studied how social behaviour and survival responded to snow melt and ice accumulation. Voles avoided ground ice by moving their home ranges, thus increasing home range overlap in enclosed populations experiencing more extensive ice cover. Winter survival was not affected by the amount of ice accumulation, and was only slightly reduced during ice formation in early winter. The lowest survival rates were found at the onset of snow melt in early spring. These results suggest that ice accumulation does not cause lower survival during mild winters, probably because plastic social behaviour enables root voles to reduce the negative effects of varying winter weather on survival. The mechanisms for lower survival during mild winters may operate during spring and be related to spring floods or increased susceptibility to predators.},
keywords = {behaviour, climate change, food, Microtus oeconomus, small mammals, small mammals, small mammals, small mammals, space use, survival},
pubstate = {published},
tppubtype = {article}
}
Mild winter weather causing snow to melt and ice to accumulate on the ground has been proposed to cause the decreased survival of individuals, and less pronounced cyclicity, of small rodent populations in Fennoscandia. However, detailed data linking ice accumulation to decreased winter survival is lacking. We live-trapped and monitored with passive integrated transponders enclosed populations of root voles (Microtus oeconomus) exposed to different amounts of ice accumulation through a mild winter. We studied how social behaviour and survival responded to snow melt and ice accumulation. Voles avoided ground ice by moving their home ranges, thus increasing home range overlap in enclosed populations experiencing more extensive ice cover. Winter survival was not affected by the amount of ice accumulation, and was only slightly reduced during ice formation in early winter. The lowest survival rates were found at the onset of snow melt in early spring. These results suggest that ice accumulation does not cause lower survival during mild winters, probably because plastic social behaviour enables root voles to reduce the negative effects of varying winter weather on survival. The mechanisms for lower survival during mild winters may operate during spring and be related to spring floods or increased susceptibility to predators.