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
2020
2.
David Rozen-Rechels; Arnaud Badiane; Simon Agostini; Sandrine Meylan; Jean-François Le Galliard
Water restriction induces behavioral fight but impairs thermoregulation in a dry-skinned ectotherm Journal Article
In: Oikos, vol. 129, no. 4, pp. 572–584, 2020, ISSN: 1600-0706.
Abstract | Links | BibTeX | Tags: activity, body temperature, dehydration, space use, squamate reptiles, water availability
@article{rozen-rechels_water_2020,
title = {Water restriction induces behavioral fight but impairs thermoregulation in a dry-skinned ectotherm},
author = {David Rozen-Rechels and Arnaud Badiane and Simon Agostini and Sandrine Meylan and Jean-François Le Galliard},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/oik.06910},
doi = {10.1111/oik.06910},
issn = {1600-0706},
year = {2020},
date = {2020-01-01},
urldate = {2020-02-11},
journal = {Oikos},
volume = {129},
number = {4},
pages = {572--584},
abstract = {Behavioral fight responses to desiccation risk are important to predict the vulnerability of terrestrial animals to climate change and yet, they have received little attention so far. In terrestrial ectotherms, behavioral regulation of the water balance (i.e. hydroregulation) is likely to be plastic and may tradeoff with thermoregulation behavior because water loss rates are generally higher in warmer environments and body temperatures. When low water availability and heat stress cause physiological dehydration, we expect to highlight a shift to behavioral water-conservation strategies including changes in activity patterns, micro-habitat selection and thermoregulation strategies. Here, we compared the behavior of adult common lizards Zootoca vivipara in indoor arenas that either had a permanent access to water or underwent a one-week long experimental water restriction. Water-restricted lizards reduced their behavioral activity, selected more often cooler and wetter refuges during daytime, and performed less accurate thermoregulation than control lizards. The activity of water-restricted gravid females shifted towards the cooler and wetter early hours of the day. In addition, they had lower body temperatures and preferred lower body temperatures at the end of the experiment (i.e. thermal depression). Water-restricted lizards suffered from a mild physiological dehydration and had a lower mass change. Heat stress was simulated every second day, which led to a range of heat avoidance and water conservation strategies independent from water restriction. Altogether, these results confirm that chronic water restriction and dehydration induce responses towards water conservation that conflict with thermoregulation accuracy.},
keywords = {activity, body temperature, dehydration, space use, squamate reptiles, water availability},
pubstate = {published},
tppubtype = {article}
}
Behavioral fight responses to desiccation risk are important to predict the vulnerability of terrestrial animals to climate change and yet, they have received little attention so far. In terrestrial ectotherms, behavioral regulation of the water balance (i.e. hydroregulation) is likely to be plastic and may tradeoff with thermoregulation behavior because water loss rates are generally higher in warmer environments and body temperatures. When low water availability and heat stress cause physiological dehydration, we expect to highlight a shift to behavioral water-conservation strategies including changes in activity patterns, micro-habitat selection and thermoregulation strategies. Here, we compared the behavior of adult common lizards Zootoca vivipara in indoor arenas that either had a permanent access to water or underwent a one-week long experimental water restriction. Water-restricted lizards reduced their behavioral activity, selected more often cooler and wetter refuges during daytime, and performed less accurate thermoregulation than control lizards. The activity of water-restricted gravid females shifted towards the cooler and wetter early hours of the day. In addition, they had lower body temperatures and preferred lower body temperatures at the end of the experiment (i.e. thermal depression). Water-restricted lizards suffered from a mild physiological dehydration and had a lower mass change. Heat stress was simulated every second day, which led to a range of heat avoidance and water conservation strategies independent from water restriction. Altogether, these results confirm that chronic water restriction and dehydration induce responses towards water conservation that conflict with thermoregulation accuracy.
1.
David Rozen‐Rechels; Pauline Farigoule; Simon Agostini; Arnaud Badiane; Sandrine Meylan; Jean-François Le Galliard
Short-term change in water availability influences thermoregulation behaviours in a dry-skinned ectotherm Journal Article
In: Journal of Animal Ecology, vol. 89, no. 9, pp. 2099-2110, 2020, ISSN: 1365-2656.
Abstract | Links | BibTeX | Tags: activity, body temperature, dehydration, squamate reptiles, thermoregulation, water availability
@article{rozenrechels_short-term_2020,
title = {Short-term change in water availability influences thermoregulation behaviours in a dry-skinned ectotherm},
author = {David Rozen‐Rechels and Pauline Farigoule and Simon Agostini and Arnaud Badiane and Sandrine Meylan and Jean-François Le Galliard},
url = {https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/1365-2656.13279},
doi = {10.1111/1365-2656.13279},
issn = {1365-2656},
year = {2020},
date = {2020-01-01},
urldate = {2020-08-03},
journal = {Journal of Animal Ecology},
volume = {89},
number = {9},
pages = {2099-2110},
abstract = {Mechanistic models of terrestrial ectotherms predict that climate warming will induce activity restriction due to heat stress and loss of shade, leading to the extinction of numerous populations. Such models rely on the assumption that activity patterns are dictated by simple temperature thresholds independent of changes in water availability. However, changes in water availability may further influence thermoregulation behaviour of ectotherms through dehydration risk perception, changes in water balance or changes in microclimatic conditions. Here, we experimentally assess the interactive effects of thermal conditions and water availability on activity patterns, shade selection and thermoregulation efficiency in a model ectothermic species. Thermoregulation behaviour of adult common lizards Zootoca vivipara was monitored in outdoor mesocosms as we manipulated water availability, providing water as mist in the morning and free-standing water during the daytime. We recorded operative temperatures and micro-meteorological conditions to infer thermal constraints and dehydration risk. Activity and shade selection were better predicted by continuous changes in thermal conditions and dehydration risk, respectively, than by threshold functions. In addition, water supplementation increased activity in males and reduced shade selection in both sexes, most probably as a behavioural response to the perception of a stronger dehydration risk. Water supplementation also influenced the thermal quality of the environment, which in turn altered daily activity patterns and thermoregulation statistics. This demonstrates that dual effects of heat and water stress on activity patterns may lead to stronger activity restriction as a result of climate change than currently predicted.},
keywords = {activity, body temperature, dehydration, squamate reptiles, thermoregulation, water availability},
pubstate = {published},
tppubtype = {article}
}
Mechanistic models of terrestrial ectotherms predict that climate warming will induce activity restriction due to heat stress and loss of shade, leading to the extinction of numerous populations. Such models rely on the assumption that activity patterns are dictated by simple temperature thresholds independent of changes in water availability. However, changes in water availability may further influence thermoregulation behaviour of ectotherms through dehydration risk perception, changes in water balance or changes in microclimatic conditions. Here, we experimentally assess the interactive effects of thermal conditions and water availability on activity patterns, shade selection and thermoregulation efficiency in a model ectothermic species. Thermoregulation behaviour of adult common lizards Zootoca vivipara was monitored in outdoor mesocosms as we manipulated water availability, providing water as mist in the morning and free-standing water during the daytime. We recorded operative temperatures and micro-meteorological conditions to infer thermal constraints and dehydration risk. Activity and shade selection were better predicted by continuous changes in thermal conditions and dehydration risk, respectively, than by threshold functions. In addition, water supplementation increased activity in males and reduced shade selection in both sexes, most probably as a behavioural response to the perception of a stronger dehydration risk. Water supplementation also influenced the thermal quality of the environment, which in turn altered daily activity patterns and thermoregulation statistics. This demonstrates that dual effects of heat and water stress on activity patterns may lead to stronger activity restriction as a result of climate change than currently predicted.