Abstract
Temperature is one of the most important factors in the life histories of ectotherms, as body temperature has an undeniable effect on growth, activity, and reproduction. Lizards have a wide variety of strategies to acquire and maintain body temperature in an optimal range. The “Thermal Melanism Hypothesis” proposes that individuals with lower skin reflectance can heat up faster as a result of absorbing more solar radiation compared to lighter conspecifics. Therefore, having a darker coloration might be advantageous in cold habitats. Dorsal skin reflectance has been found to change rapidly with body temperature in several lizard species, and it can also vary over longer, seasonal time scales. These variations may be important in thermoregulation, especially in lizards that inhabit areas with a large temperature variation during the year. Here, we study how dorsal reflectance fluctuates with body temperature and varies among seasons. We compared dorsal skin reflectance at three body temperature treatments, and measured thermal rates (i.e., heat and cool rate, thermic lapse, and net heat gain) by elevation (2500–4100 m) and seasons (spring, summer, and autumn) in the mesquite lizard, Sceloporus grammicus. Our results show that lizards were darker at high elevations and during the months with the lowest environmental temperatures. The rate of obtaining and retaining heat also varied during the year and was highest during the reproductive season. Our results indicate that the variation of dorsal skin reflectance and thermal rates follows a complex pattern in lizard populations and is affected by both elevation and season.
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We are grateful to the Consejo Nacional de Ciencia y Tecnologí (Ph.D. degree scholarship JRR and JCGM).
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JRR and JCGM conceived and designed the experiments. JRR, EQ and, JCGM performed the experiments. JCGM, GMR, EB analyzed the data. JRR, JCGM, MP, and, GMR wrote the manuscript; other authors provided editorial advice.
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González-Morales, J.C., Rivera-Rea, J., Moreno-Rueda, G. et al. Seasonal and altitudinal variation in dorsal skin reflectance and thermic rates in a high-altitude montane lizard. Int J Biometeorol (2024). https://doi.org/10.1007/s00484-024-02677-7
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DOI: https://doi.org/10.1007/s00484-024-02677-7