Mirna C. Vera-Chávez , Donald B. Miles , Diego M. Arenas-Moreno , Fausto R. Méndez-de la Cruz
{"title":"Is a warmer environment better for a high-mountain lizard?","authors":"Mirna C. Vera-Chávez , Donald B. Miles , Diego M. Arenas-Moreno , Fausto R. Méndez-de la Cruz","doi":"10.1016/j.jtherbio.2025.104265","DOIUrl":null,"url":null,"abstract":"<div><div>The global increase in temperatures threatens the survival of lizards in habitats with broad thermal oscillations. Viviparous populations in high mountains (sky islands) often exhibit a greater thermal tolerance, a trait that, according to Janzen's Hypothesis, is favored by these environments. This raises the question of whether such an adaptation can help them cope with global warming more effectively than populations at lower elevations. To investigate this, we translocated <em>Sceloporus bicanthalis</em> from its native habitat at 4100 m (the species occupy elevations between 2500 and 4250 m) to a lower elevation of 2060 m, simulating a temperature increase. During a 45-day acclimatisation experiment, we measured thermophysiological traits and locomotor performance in pre-acclimatisation (in their native habitat) and post-acclimatisation individuals (at the lower-elevation site). Although we found no changes in thermal limits, the effectiveness of thermoregulation (<em>E</em>) was greater in the pre-acclimatisation group. Translocated individuals showed an increase in maximum sprint speed (<em>Vmax</em>), while the optimal performance temperature (<em>Topt</em>) remained constant in both groups and coincided with their preferred temperature range. Our study demonstrated that, far from being a strict thermal specialist, the thermal physiology of <em>S. bicanthalis</em> allows it to persist in habitats with warmer thermal conditions, evidencing a greater thermal tolerance and suggesting sufficient physiological plasticity to cope with increasing ambient temperatures.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"133 ","pages":"Article 104265"},"PeriodicalIF":2.9000,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of thermal biology","FirstCategoryId":"99","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306456525002220","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The global increase in temperatures threatens the survival of lizards in habitats with broad thermal oscillations. Viviparous populations in high mountains (sky islands) often exhibit a greater thermal tolerance, a trait that, according to Janzen's Hypothesis, is favored by these environments. This raises the question of whether such an adaptation can help them cope with global warming more effectively than populations at lower elevations. To investigate this, we translocated Sceloporus bicanthalis from its native habitat at 4100 m (the species occupy elevations between 2500 and 4250 m) to a lower elevation of 2060 m, simulating a temperature increase. During a 45-day acclimatisation experiment, we measured thermophysiological traits and locomotor performance in pre-acclimatisation (in their native habitat) and post-acclimatisation individuals (at the lower-elevation site). Although we found no changes in thermal limits, the effectiveness of thermoregulation (E) was greater in the pre-acclimatisation group. Translocated individuals showed an increase in maximum sprint speed (Vmax), while the optimal performance temperature (Topt) remained constant in both groups and coincided with their preferred temperature range. Our study demonstrated that, far from being a strict thermal specialist, the thermal physiology of S. bicanthalis allows it to persist in habitats with warmer thermal conditions, evidencing a greater thermal tolerance and suggesting sufficient physiological plasticity to cope with increasing ambient temperatures.
期刊介绍:
The Journal of Thermal Biology publishes articles that advance our knowledge on the ways and mechanisms through which temperature affects man and animals. This includes studies of their responses to these effects and on the ecological consequences. Directly relevant to this theme are:
• The mechanisms of thermal limitation, heat and cold injury, and the resistance of organisms to extremes of temperature
• The mechanisms involved in acclimation, acclimatization and evolutionary adaptation to temperature
• Mechanisms underlying the patterns of hibernation, torpor, dormancy, aestivation and diapause
• Effects of temperature on reproduction and development, growth, ageing and life-span
• Studies on modelling heat transfer between organisms and their environment
• The contributions of temperature to effects of climate change on animal species and man
• Studies of conservation biology and physiology related to temperature
• Behavioural and physiological regulation of body temperature including its pathophysiology and fever
• Medical applications of hypo- and hyperthermia
Article types:
• Original articles
• Review articles