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.
2021
1.
J. -F. Le Galliard; Chloé Chabaud; Denis Otávio Vieira de Andrade; Franc cois Brischoux; Miguel A. Carretero; Andréaz Dupoué; Rodrigo S. B. Gavira; Olivier Lourdais; Marco Sannolo; Tom J. M. Van Dooren
A worldwide and annotated database of evaporative water loss rates in squamate reptiles Journal Article
In: Global Ecology and Biogeography, vol. 30, no. 10, pp. 1938–1950, 2021, ISSN: 1466-8238, (_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/geb.13355).
Abstract | Links | BibTeX | Tags: ectotherms, evaporative water loss, functional traits, homeostasis, hydroregulation, lizards, macrophysiology, snakes, water loss
@article{le_galliard_worldwide_2021,
title = {A worldwide and annotated database of evaporative water loss rates in squamate reptiles},
author = {J. -F. Le Galliard and Chloé Chabaud and Denis Otávio Vieira de Andrade and Franc cois Brischoux and Miguel A. Carretero and Andréaz Dupoué and Rodrigo S. B. Gavira and Olivier Lourdais and Marco Sannolo and Tom J. M. Van Dooren},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/geb.13355},
doi = {10.1111/geb.13355},
issn = {1466-8238},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Global Ecology and Biogeography},
volume = {30},
number = {10},
pages = {1938--1950},
abstract = {Motivation The understanding of physiological adaptations, of evolutionary radiations and of ecological responses to global change urges for global, comprehensive databases of the functional traits of extant organisms. The ability to maintain an adequate water balance is a critical functional property influencing the resilience of animal species to climate variation. In terrestrial or semi-terrestrial organisms, total water loss includes a significant contribution from evaporative water loss (EWL). The analysis of geographic and phylogenetic variation in EWL rates must however account for differences in methods and potential confounding factors, which influence standard measures of whole-organism water loss. We compiled the global and standardized SquamEWL database of total, respiratory and cutaneous EWL for 325 species and subspecies of squamate reptiles (793 samples and 2,536 estimates) from across the globe. An extensive set of companion data and annotations associated with the EWL measurements of potential value for future investigation, including metabolic rate data, is provided. We present preliminary descriptive statistics for the compiled data, discuss gaps and biases, and identify promising avenues to update, expand and explore this database. Main types of variables contained Standard water loss rates, geographic data, metabolic rates. Spatial location Global. Time period Data were obtained from extant species and were collected between 1945 and 2020. Major taxa Reptilia, Squamata including lizards, snakes and amphisbaenians. Level of measurements Individual samples of animals from the same species, locality, age class and sex category. Software format csv.},
note = {_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/geb.13355},
keywords = {ectotherms, evaporative water loss, functional traits, homeostasis, hydroregulation, lizards, macrophysiology, snakes, water loss},
pubstate = {published},
tppubtype = {article}
}
Motivation The understanding of physiological adaptations, of evolutionary radiations and of ecological responses to global change urges for global, comprehensive databases of the functional traits of extant organisms. The ability to maintain an adequate water balance is a critical functional property influencing the resilience of animal species to climate variation. In terrestrial or semi-terrestrial organisms, total water loss includes a significant contribution from evaporative water loss (EWL). The analysis of geographic and phylogenetic variation in EWL rates must however account for differences in methods and potential confounding factors, which influence standard measures of whole-organism water loss. We compiled the global and standardized SquamEWL database of total, respiratory and cutaneous EWL for 325 species and subspecies of squamate reptiles (793 samples and 2,536 estimates) from across the globe. An extensive set of companion data and annotations associated with the EWL measurements of potential value for future investigation, including metabolic rate data, is provided. We present preliminary descriptive statistics for the compiled data, discuss gaps and biases, and identify promising avenues to update, expand and explore this database. Main types of variables contained Standard water loss rates, geographic data, metabolic rates. Spatial location Global. Time period Data were obtained from extant species and were collected between 1945 and 2020. Major taxa Reptilia, Squamata including lizards, snakes and amphisbaenians. Level of measurements Individual samples of animals from the same species, locality, age class and sex category. Software format csv.