Articles, books and book chapters

@article{rozenrechels_interaction_2021,

title = {Interaction of hydric and thermal conditions drive geographic variation in thermoregulation in a widespread lizard},

author = {David Rozen‐Rechels and Alexis Rutschmann and Andréaz Dupoué and Pauline Blaimont and Victor Chauveau and Donald B. Miles and Michael Guillon and Murielle Richard and Arnaud Badiane and Sandrine Meylan and Jean Clobert and Jean-François Le Galliard},

url = {https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1002/ecm.1440},

doi = {10.1002/ecm.1440},

issn = {1557-7015},

year  = {2021},

date = {2021-01-01},

urldate = {2020-11-05},

journal = {Ecological Monographs},

volume = {91},

number = {2},

pages = {e01440},

abstract = {Behavioral thermoregulation is an efficient mechanism to buffer the physiological effects of climate change. Thermal ecology studies have traditionally tested how thermal constraints shape thermoregulatory behaviors without accounting for the potential major effects of landscape structure and water availability. Thus, we lack a general understanding of the multifactorial determinants of thermoregulatory behaviors in natural populations. In this study, we quantified the relative contribution of elevation, thermal gradient, moisture gradient and landscape structure in explaining geographic variation in thermoregulation strategies of a terrestrial ectotherm species. We measured field active body temperature, thermal preferences and operative environmental temperatures to calculate thermoregulation indices, including thermal quality of the habitat and thermoregulation efficiency for a very large sample of common lizards (Zootoca vivipara) from 21 populations over 3 years across the Massif Central mountain range in France. We used an information-theoretic approach to compare eight a priori thermo-hydroregulation hypotheses predicting how behavioral thermoregulation should respond to environmental conditions. Environmental characteristics exerted little influence on thermal preference with the exception that females from habitats with permanent access to water had lower thermal preferences. Field body temperatures and accuracy of thermoregulation were best predicted by the interaction between air temperature and a moisture index. In mesic environments, field body temperature and thermoregulation inaccuracy increased with air temperature, but they decreased in drier habitats. Thermoregulation efficiency (difference between thermoregulation inaccuracy and the thermal quality of the habitat) was maximized in cooler and more humid environments and was mostly influenced by the thermal quality of the habitat. Our study highlights complex patterns of variation in thermoregulation strategies, which are mostly explained by the interaction between temperature and water availability, independent of the elevation gradient or thermal heterogeneity. Although changes in landscape structure were expected to be the main driver of extinction rate of temperate zone ectotherms with ongoing global change, we conclude that changes in water availability coupled with rising temperatures might have a drastic impact on the population dynamics of some ectotherm species.},

keywords = {body temperature, elevational gradient},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@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}

}

@article{rozen-rechels_acclimation_2020,

title = {Acclimation to water restriction implies different paces for behavioral and physiological responses in a lizard species},

author = {David Rozen-Rechels and Andréaz Dupoué and Sandrine Meylan and Kenza Qitout and Beatriz Decencière and Simon Agostini and Jean-François Le Galliard},

url = {https://www.journals.uchicago.edu/doi/abs/10.1086/707409},

doi = {10.1086/707409},

issn = {1522-2152},

year  = {2020},

date = {2020-01-01},

urldate = {2019-12-11},

journal = {Physiological and Biochemical Zoology},

volume = {93},

number = {2},

pages = {160--174},

keywords = {activity, body temperature, exploration, metabolism, squamate reptiles, water availability, water loss},

pubstate = {published},

tppubtype = {article}

}

@article{rozen-rechels_when_2019,

title = {When water interacts with temperature: Ecological and evolutionary implications of thermo-hydroregulation in terrestrial ectotherms},

author = {David Rozen-Rechels and Andréaz Dupoué and Olivier Lourdais and Simon Chamaillé-Jammes and Sandrine Meylan and Jean Clobert and Jean-François Le Galliard},

url = {https://onlinelibrary.wiley.com/doi/full/10.1002/ece3.5440},

doi = {https://doi.org/10.1002/ece3.5440},

year  = {2019},

date = {2019-01-01},

journal = {Ecology and evolution},

volume = {9},

number = {17},

pages = {10029--10043},

keywords = {behaviour, body temperature, performance, water balance},

pubstate = {published},

tppubtype = {article}

}

@article{https://doi.org/10.1002/ecm.1440,

title = {Interaction of hydric and thermal conditions drive geographic variation in thermoregulation in a widespread lizard},

author = {David Rozen-Rechels and Alexis Rutschmann and Andréaz Dupoué and Pauline Blaimont and Victor Chauveau and Donald B Miles and Michael Guillon and Murielle Richard and Arnaud Badiane and Sandrine Meylan and Jean Clobert and Jean-François Le Galliard},

url = {https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1002/ecm.1440},

doi = {https://doi.org/10.1002/ecm.1440},

journal = {Ecological Monographs},

volume = {n/a},

number = {n/a},

abstract = {Abstract Behavioral thermoregulation is an efficient mechanism to buffer the physiological effects of climate change. Thermal ecology studies have traditionally tested how thermal constraints shape thermoregulatory behaviors without accounting for the potential major effects of landscape structure and water availability. Thus, we lack a general understanding of the multifactorial determinants of thermoregulatory behaviors in natural populations. In this study, we quantified the relative contribution of elevation, thermal gradient, moisture gradient and landscape structure in explaining geographic variation in thermoregulation strategies of a terrestrial ectotherm species. We measured field active body temperature, thermal preferences and operative environmental temperatures to calculate thermoregulation indices, including thermal quality of the habitat and thermoregulation efficiency for a very large sample of common lizards (Zootoca vivipara) from 21 populations over 3 years across the Massif Central mountain range in France. We used an information-theoretic approach to compare eight a priori thermo-hydroregulation hypotheses predicting how behavioral thermoregulation should respond to environmental conditions. Environmental characteristics exerted little influence on thermal preference with the exception that females from habitats with permanent access to water had lower thermal preferences. Field body temperatures and accuracy of thermoregulation were best predicted by the interaction between air temperature and a moisture index. In mesic environments, field body temperature and thermoregulation inaccuracy increased with air temperature, but they decreased in drier habitats. Thermoregulation efficiency (difference between thermoregulation inaccuracy and the thermal quality of the habitat) was maximized in cooler and more humid environments and was mostly influenced by the thermal quality of the habitat. Our study highlights complex patterns of variation in thermoregulation strategies, which are mostly explained by the interaction between temperature and water availability, independent of the elevation gradient or thermal heterogeneity. Although changes in landscape structure were expected to be the main driver of extinction rate of temperate zone ectotherms with ongoing global change, we conclude that changes in water availability coupled with rising temperatures might have a drastic impact on the population dynamics of some ectotherm species.},

keywords = {body temperature, elevational gradient},

pubstate = {published},

tppubtype = {article}

}