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
2024
3.
Théo Bodineau; Chloé Chabaud; Beatriz Decencière; Simon Agostini; Olivier Lourdais; Sandrine Meylan; Jean-François Le Galliard
Microhabitat humidity rather than food availability drives thermo-hydroregulation responses to drought in a lizard Journal Article
In: Oikos, vol. 2024, no. 6, pp. e10535, 2024, ISSN: 1600-0706, (_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/oik.10535).
Abstract | Links | BibTeX | Tags: behaviour, food, microhabitat, shelter, thermo-hydroregulation, tradeoff, water
@article{bodineau_microhabitat_2024c,
title = {Microhabitat humidity rather than food availability drives thermo-hydroregulation responses to drought in a lizard},
author = {Théo Bodineau and Chloé Chabaud and Beatriz Decencière and Simon Agostini and Olivier Lourdais and Sandrine Meylan and Jean-François Le Galliard},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/oik.10535},
doi = {10.1111/oik.10535},
issn = {1600-0706},
year = {2024},
date = {2024-01-01},
urldate = {2024-05-13},
journal = {Oikos},
volume = {2024},
number = {6},
pages = {e10535},
abstract = {The regulation of energy, water and thermal balance involves integrated processes that should drive ecological responses of ectotherms to climate change. Functional tradeoffs between thermoregulation and hydroregulation are exacerbated during hot or dry spells, but how microhabitat hydric properties and trophic resource availability influence these tradeoffs remains unknown. Here, we investigated the effects of microhabitat humidity and food availability on thermo-hydroregulation strategies in the ground-dwelling common lizard Zootoca vivipara during a simulated hot and dry spell event. We exposed lizards to a five-day long acute water restriction in hot conditions in the laboratory and manipulated hydric quality of the retreat site (wet or dry shelter) as well as food availability (ad libitum food or food deprivation). Water restriction and food deprivation caused physiological responses such as muscle catabolism and mobilization of caudal energy reserves. Lizards also developed behavioural strategies to conserve water or energy via decreased thermoregulation effort, higher shelter use and increased eye closure behaviours through time. These physiological and behavioural changes were importantly buffered by the presence of a wet shelter but not by food availability. A wet retreat site reduced the behavioural conflicts between thermoregulation and hydroregulation, allowed lizards to maintain a better condition and reduced physiological dehydration. Instead, food intake did not play a major role in the regulation of hydration state and increased behavioural conflicts between thermoregulation and hydroregulation. A better consideration of thermo-hydroregulation behaviours and microhabitat hydric quality is required to address ectotherm responses to future climate change.},
note = {_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/oik.10535},
keywords = {behaviour, food, microhabitat, shelter, thermo-hydroregulation, tradeoff, water},
pubstate = {published},
tppubtype = {article}
}
The regulation of energy, water and thermal balance involves integrated processes that should drive ecological responses of ectotherms to climate change. Functional tradeoffs between thermoregulation and hydroregulation are exacerbated during hot or dry spells, but how microhabitat hydric properties and trophic resource availability influence these tradeoffs remains unknown. Here, we investigated the effects of microhabitat humidity and food availability on thermo-hydroregulation strategies in the ground-dwelling common lizard Zootoca vivipara during a simulated hot and dry spell event. We exposed lizards to a five-day long acute water restriction in hot conditions in the laboratory and manipulated hydric quality of the retreat site (wet or dry shelter) as well as food availability (ad libitum food or food deprivation). Water restriction and food deprivation caused physiological responses such as muscle catabolism and mobilization of caudal energy reserves. Lizards also developed behavioural strategies to conserve water or energy via decreased thermoregulation effort, higher shelter use and increased eye closure behaviours through time. These physiological and behavioural changes were importantly buffered by the presence of a wet shelter but not by food availability. A wet retreat site reduced the behavioural conflicts between thermoregulation and hydroregulation, allowed lizards to maintain a better condition and reduced physiological dehydration. Instead, food intake did not play a major role in the regulation of hydration state and increased behavioural conflicts between thermoregulation and hydroregulation. A better consideration of thermo-hydroregulation behaviours and microhabitat hydric quality is required to address ectotherm responses to future climate change.
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.