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Thermal biology and locomotor performance in Phymaturus calcogaster: are Patagonian lizards vulnerable to climate change?
Integrative Zoology ( IF 3.5 ) Pub Date : 2020-08-21 , DOI: 10.1111/1749-4877.12481
Rosa L ObregÓn 1, 2 , Jose A Scolaro 1, 2 , Nora R IbargÜengoytÍa 3 , Marlin Medina 4
Affiliation  

Behavioral and physiological traits of ectotherms are especially sensitive to fluctuations of environmental temperature. In particular, niche‐specialist lizards are dependent on their physiological plasticity to adjust to changing environmental conditions. Lizards of the genus Phymaturus are viviparous, mainly herbivorous, and inhabit only rock promontories in the steppe environments of Patagonia and the Andes. Herein, we examine the vulnerability of the southernmost Phymaturus species to global warming: the endemic Phymaturus calcogaster, which lives in a mesic environment in eastern Patagonia. We studied body temperatures in the field (Tb), preferred body temperatures in a thermogradient (Tpref), the operative (Te) and environmental temperatures, and the dependence of running performance on body temperature. P. calcogaster had a mean Tb (27.04°C) and a mean Te (31.15°C) both lower than their preferred temperature (Tpref = 36.61°C) and the optimal temperature for running performance (To = 37.13°C). Lizard activity seems to be restraint during the early afternoon due high environmental temperatures. However, both, the high safety margin and warming tolerance suggest that the expected increase in environmental temperatures due to global warming (IPCC report in 2018) would not threaten, but indeed enhance locomotor performance in this population.

中文翻译:

邻花柏(Phymaturus calcogaster)的热生物学和运动性能:巴塔哥尼亚蜥蜴是否容易受到气候变化的影响?

放热的行为和生理特征对环境温度的波动特别敏感。特别是,利基专家蜥蜴依赖于它们的生理可塑性来适应不断变化的环境条件。Phymaturus属的蜥蜴是胎生的,主要是草食性的,仅栖息于巴塔哥尼亚和安第斯山脉的草原海角。在这里,我们研究了最南端的Phymaturus物种对全球变暖的脆弱性:一种地方性Phymaturus calcogaster,它生活在巴塔哥尼亚东部的一个中等环境中。我们研究了野外的体温(T b),热梯度中的优选体温(Tpref),操作温度(T e)和环境温度,以及跑步性能对体温的依赖性。Calcogaster的平均T b(27.04°C)和平均T e(31.15°C)均低于其优选温度(T pref = 36.61°C)和运行性能的最佳温度(T o= 37.13°C)。由于环境温度高,蜥蜴的活动在午后似乎受到限制。但是,高的安全裕度和变暖耐受性都表明,由于全球变暖(2018年IPCC报告)而导致的预期环境温度升高不会威胁到该人群的运动能力,但确实可以增强其运动能力。
更新日期:2020-08-21
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