Is a warmer environment better for a high-mountain lizard?

IF 2.9 2区 生物学 Q2 BIOLOGY
Mirna C. Vera-Chávez , Donald B. Miles , Diego M. Arenas-Moreno , Fausto R. Méndez-de la Cruz
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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.
温暖的环境对高山蜥蜴来说更好吗?
全球气温的上升威胁着蜥蜴在广泛的热振荡栖息地的生存。高山(天空之岛)的胎生种群通常表现出更强的耐热性,根据简森的假说,这种特性受到这些环境的青睐。这就提出了这样一个问题:这种适应是否能帮助它们比低海拔地区的人口更有效地应对全球变暖?为了研究这一点,我们将双anthalis从4100 m(海拔2500 - 4250 m)的原始栖息地迁移到海拔较低的2060 m,模拟温度升高。在为期45天的适应实验中,我们测量了适应前(在其原生栖息地)和适应后(在低海拔地点)个体的热生理特征和运动表现。虽然我们没有发现热极限的变化,但在预适应组中,温度调节(E)的有效性更大。易位个体的最大冲刺速度(Vmax)增加,而最佳运动温度(Topt)保持不变,且与易位个体的偏好温度范围一致。我们的研究表明,远不是严格的热专家,S. bicanthalis的热生理使它能够在温暖的热条件下生存,证明了更大的热耐受性,并表明有足够的生理可塑性来应对不断升高的环境温度。
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来源期刊
Journal of thermal biology
Journal of thermal biology 生物-动物学
CiteScore
5.30
自引率
7.40%
发文量
196
审稿时长
14.5 weeks
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
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