Articles, books and book chapters

@article{voituron_mitochondrial_2022,

title = {Mitochondrial oxidative phosphorylation response overrides glucocorticoid-induced stress in a reptile},

author = {Yann Voituron and Damien Roussel and Jean-François Le Galliard and Andréaz Dupoué and Caroline Romestaing and Sandrine Meylan},

url = {https://doi.org/10.1007/s00360-022-01454-5},

doi = {10.1007/s00360-022-01454-5},

issn = {1432-136X},

year  = {2022},

date = {2022-08-01},

urldate = {2022-08-16},

journal = {Journal of Comparative Physiology B},

abstract = {Stress hormones and their impacts on whole organism metabolic rates are usually considered as appropriate proxies for animal energy budget that is the foundation of numerous concepts and models aiming at predicting individual and population responses to environmental stress. However, the dynamics of energy re-allocation under stress make the link between metabolism and corticosterone complex and still unclear. Using ectopic application of corticosterone for 3, 11 and 21 days, we estimated a time effect of stress in a lizard (Zootoca vivipara). We then investigated whole organism metabolism, muscle cellular O2 consumption and liver mitochondrial oxidative phosphorylation processes (O2 consumption and ATP production) and ROS production. The data showed that while skeletal muscle is not impacted, stress regulates the liver mitochondrial functionality in a time-dependent manner with opposing pictures between the different time expositions to corticosterone. While 3 days exposition is characterized by lower ATP synthesis rate and high H2O2 release with no change in the rate of oxygen consumption, the 11 days exposition reduced all three fluxes of about 50%. Oxidative phosphorylation capacities in liver mitochondria of lizard treated with corticosterone for 21 days was similar to the hepatic mitochondrial capacities in lizards that received no corticosterone treatment but with 40% decrease in H2O2 production. This new mitochondrial functioning allows a better capacity to respond to the energetic demands imposed by the environment but do not influence whole organism metabolism. In conclusion, global mitochondrial functioning has to be considered to better understand the proximal causes of the energy budget under stressful periods.},

keywords = {corticosterone, metabolism},

pubstate = {published},

tppubtype = {article}

}

@article{dezetter_additive_2021,

title = {Additive effects of developmental acclimation and physiological syndromes on lifetime metabolic and water loss rates of a dry-skinned ectotherm},

author = {Mathias Dezetter and Andréaz Dupoué and Jean François Le Galliard and Olivier Lourdais},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/1365-2435.13951},

doi = {10.1111/1365-2435.13951},

issn = {1365-2435},

year  = {2022},

date = {2022-02-01},

journal = {Functional Ecology},

volume = {36},

issue = {2},

pages = {432-445},

abstract = {Developmental plasticity and thermal acclimation can contribute to adaptive responses to climate change by altering functional traits related to energy and water balance regulation. How plasticity interacts with physiological syndromes through lifetime in long-lived species is currently unknown. Here, we examined the impacts of long term thermal acclimation in a long-lived temperate ectotherm (Vipera aspis) and its potential flexibility at adulthood for two related functional traits: standard metabolic rate (SMR) and total evaporative water loss (TEWL). We used climatic chambers to simulate three contrasted daily thermal cycles (warm, medium and cold) differing in mean temperatures (28, 24, and 20°C respectively) and amplitudes (5, 10 and 13°C respectively) during immature life (0 to 4 years of age). Individuals were then maintained under common garden conditions (medium cycle) for an additional 3-years period (4 to 7 years of age). SMR and TEWL were repeatedly measured in the same individuals throughout life during and after the climate manipulation. Individuals reduced their SMR (negative compensation) when experiencing the warm cycle but flexibly adjusted their SMR to common garden conditions at adulthood. In addition, thermal conditions during the juvenile life stage led to changes in TEWL persisting until adulthood. We further found consistent intra-individual variation for SMR and TEWL and a positive intra-individual and inter-individual covariation between them throughout life. Thus, plastic responses were combined with a physiological syndrome linking SMR and TEWL. Our study demonstrates the capacity of long-lived organisms to flexibly shift their SMR to reduce daily maintenance costs in warmer and less variable thermal environments, which might be beneficial for low energy specialist organisms such as vipers. It further suggests that thermal conditions provide cues for developmental changes in TEWL. Beside plasticity, contrasted individual physiological syndromes could be selected for and contribute to the response to climate change.},

note = {_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2435.13951},

keywords = {metabolism, physiology, plasticity, temperature, water loss},

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{artacho_quantification_2015,

title = {Quantification of correlational selection on thermal physiology, thermoregulatory behavior, and energy metabolism in lizards},

author = {Paulina Artacho and Julia Saravia and Beatriz Decencière Ferrandière and Samuel Perret and Jean-François Le Galliard},

url = {https://onlinelibrary.wiley.com/doi/full/10.1002/ece3.1548},

doi = {https://doi.org/10.1002/ece3.1548},

issn = {2045-7758},

year  = {2015},

date = {2015-01-01},

journal = {Ecology and Evolution},

volume = {5},

number = {17},

pages = {3600--3609},

abstract = {Phenotypic selection is widely accepted as the primary cause of adaptive evolution in natural populations, but selection on complex functional properties linking physiology, behavior, and morphology has been rarely quantified. In ectotherms, correlational selection on thermal physiology, thermoregulatory behavior, and energy metabolism is of special interest because of their potential coadaptation. We quantified phenotypic selection on thermal sensitivity of locomotor performance (sprint speed), thermal preferences, and resting metabolic rate in captive populations of an ectothermic vertebrate, the common lizard, Zootoca vivipara. No correlational selection between thermal sensitivity of performance, thermoregulatory behavior, and energy metabolism was found. A combination of high body mass and resting metabolic rate was positively correlated with survival and negatively correlated with fecundity. Thus, different mechanisms underlie selection on metabolism in lizards with small body mass than in lizards with high body mass. In addition, lizards that selected the near average preferred body temperature grew faster that their congeners. This is one of the few studies that quantifies significant correlational selection on a proxy of energy expenditure and stabilizing selection on thermoregulatory behavior.},

keywords = {metabolism, natural selection, squamate reptiles, thermal coadaptation},

pubstate = {published},

tppubtype = {article}

}

@article{artacho_interindividual_2013,

title = {Interindividual variation in thermal sensitivity of maximal sprint speed, thermal behavior, and resting metabolic rate in a lizard},

author = {Paulina Artacho and Isabelle Jouanneau and Jean-François Le Galliard},

url = {https://www.journals.uchicago.edu/doi/abs/10.1086/671376},

doi = {https://doi.org/10.1086/671376},

issn = {1522-2152},

year  = {2013},

date = {2013-01-01},

journal = {Physiological and Biochemical Zoology},

volume = {86},

number = {4},

pages = {458--469},

abstract = {Studies of the relationship of performance and behavioral traits with environmental factors have tended to neglect interindividual variation even though quantification of this variation is fundamental to understanding how phenotypic traits can evolve. In ectotherms, functional integration of locomotor performance, thermal behavior, and energy metabolism is of special interest because of the potential for coadaptation among these traits. For this reason, we analyzed interindividual variation, covariation, and repeatability of the thermal sensitivity of maximal sprint speed, preferred body temperature, thermal precision, and resting metabolic rate measured in ca. 200 common lizards (Zootoca vivipara) that varied by sex, age, and body size. We found significant interindividual variation in selected body temperatures and in the thermal performance curve of maximal sprint speed for both the intercept (expected trait value at the average temperature) and the slope (measure of thermal sensitivity). Interindividual differences in maximal sprint speed across temperatures, preferred body temperature, and thermal precision were significantly repeatable. A positive relationship existed between preferred body temperature and thermal precision, implying that individuals selecting higher temperatures were more precise. The resting metabolic rate was highly variable but was not related to thermal sensitivity of maximal sprint speed or thermal behavior. Thus, locomotor performance, thermal behavior, and energy metabolism were not directly functionally linked in the common lizard.},

keywords = {metabolism, thermal sensitivity, Zootoca vivipara},

pubstate = {published},

tppubtype = {article}

}