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2021
1.
Alexis Rutschmann; Andréaz Dupoué; Donald B. Miles; Megía R. Palma; C Lauden; Murielle Richard; Arnaud Badiane; David Rozen‐Rechels; Mathieu Brevet; Pauline Blaimont; Sandrine Meylan; Jean Clobert; Jean-François Le Galliard
Intense nocturnal warming alters growth strategies, coloration, and parasite load in a diurnal lizard Journal Article
In: Journal of Animal Ecology, vol. 90, no. 8, pp. 1864-1877, 2021, ISSN: 1365-2656.
Abstract | Links | BibTeX | Tags: ectotherms, energetic balance, nocturnal temperatures, oxidative stress
@article{rutschmann_intense_2021,
title = {Intense nocturnal warming alters growth strategies, coloration, and parasite load in a diurnal lizard},
author = {Alexis Rutschmann and Andréaz Dupoué and Donald B. Miles and Megía R. Palma and C Lauden and Murielle Richard and Arnaud Badiane and David Rozen‐Rechels and Mathieu Brevet and Pauline Blaimont and Sandrine Meylan and Jean Clobert and Jean-François Le Galliard},
url = {https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/1365-2656.13502},
doi = {https://doi.org/10.1111/1365-2656.13502},
issn = {1365-2656},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {Journal of Animal Ecology},
volume = {90},
number = {8},
pages = {1864-1877},
abstract = {1. In the past decades, nocturnal temperatures have been playing a disproportionate role in the global warming of the planet. Yet, they remain a neglected factor in studies assessing the impact of global warming on natural populations. 2. Here, we question whether an intense augmentation of nocturnal temperatures is beneficial or deleterious to ectotherms. Physiological performance is influenced by thermal conditions in ectotherms and an increase in temperature by only 2°C is sufficient to induce a disproportionate increase in metabolic expenditure. Warmer nights may expand ectotherms’ species thermal niche and open new opportunities for prolonged activities and improve foraging efficiency. However, increased activity may also have deleterious effects on energy balance if exposure to warmer nights reduces resting periods and elevates resting metabolic rate. 3. We assessed whether warmer nights affected an individual’s growth, dorsal skin colouration, thermoregulation behaviour, oxidative stress status and parasite load by exposing yearling common lizards (Zootoca vivipara) from four populations to either ambient or high nocturnal temperatures for approximately five weeks. 4. Warmer nocturnal temperatures increased the prevalence of ectoparasitic infestation and altered allocation of resources toward structural growth rather than storage. We found no change in markers for oxidative stress. The thermal treatment did not influence thermal preferences, but influenced dorsal skin brightness and luminance, in line with a predicted acclimation response in colder environments to enhance heat gain from solar radiation. 5. Altogether, our results highlight the importance of considering nocturnal warming as an independent factor affecting ectotherms life-history in the context of global climate change.},
keywords = {ectotherms, energetic balance, nocturnal temperatures, oxidative stress},
pubstate = {published},
tppubtype = {article}
}
1. In the past decades, nocturnal temperatures have been playing a disproportionate role in the global warming of the planet. Yet, they remain a neglected factor in studies assessing the impact of global warming on natural populations. 2. Here, we question whether an intense augmentation of nocturnal temperatures is beneficial or deleterious to ectotherms. Physiological performance is influenced by thermal conditions in ectotherms and an increase in temperature by only 2°C is sufficient to induce a disproportionate increase in metabolic expenditure. Warmer nights may expand ectotherms’ species thermal niche and open new opportunities for prolonged activities and improve foraging efficiency. However, increased activity may also have deleterious effects on energy balance if exposure to warmer nights reduces resting periods and elevates resting metabolic rate. 3. We assessed whether warmer nights affected an individual’s growth, dorsal skin colouration, thermoregulation behaviour, oxidative stress status and parasite load by exposing yearling common lizards (Zootoca vivipara) from four populations to either ambient or high nocturnal temperatures for approximately five weeks. 4. Warmer nocturnal temperatures increased the prevalence of ectoparasitic infestation and altered allocation of resources toward structural growth rather than storage. We found no change in markers for oxidative stress. The thermal treatment did not influence thermal preferences, but influenced dorsal skin brightness and luminance, in line with a predicted acclimation response in colder environments to enhance heat gain from solar radiation. 5. Altogether, our results highlight the importance of considering nocturnal warming as an independent factor affecting ectotherms life-history in the context of global climate change.