Body temperature stability achieved by the large body mass of sea turtles
Body temperature stability achieved by the large body mass of sea turtles
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海龟的大体重实现了体温稳定性
DOI：
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发表时间：
2014
影响因子：
2.8
通讯作者：
Katsufumi Sato
中科院分区：
文献类型：
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作者：
Katsufumi Sato
为了研究生活在水中的大型爬行动物的热特性，使用数据记录器连续记录了 16 只自由放养的红海龟 (Caretta caretta) 在筑巢期间的温度数据。核心体温比环境水温高 0.7–1.7°C，并保持相对恒定。使用球形热力学模型的非稳态数值模拟为这些现象提供了机械解释，体温对水温波动的响应可以简单地用具有恒定热扩散率和产热率的大体重来解释，而不是用生理温度调节来解释。相比之下，它们在陆地上筑巢期间，体温在 107-152 分钟内升高了 2.6-5.1°C。陆地上的估计产热量是海洋中计算值的 7.4-10.5 倍。身体和水温之间的温差会根据体型大小而增加的理论预测得到了几种海龟记录的经验数据的证实。与之前报道的数据相比，当体温较高时，棱皮龟、绿龟和红海龟的筑巢间隔时间较短。海龟似乎受益于被动的体温调节策略，该策略主要取决于它们庞大的身体质量的物理属性。
To investigate the thermal characteristics of large reptiles living in water, temperature data were continuously recorded from 16 free-ranging loggerhead turtles, Caretta caretta, during internesting periods using data loggers. Core body temperatures were 0.7–1.7°C higher than ambient water temperatures and were kept relatively constant. Unsteady numerical simulations using a spherical thermodynamic model provided mechanistic explanations for these phenomena, and the body temperature responses to fluctuating water temperature can be simply explained by a large body mass with a constant thermal diffusivity and a heat production rate rather than physiological thermoregulation. By contrast, body temperatures increased 2.6–5.1°C in 107–152 min during their emergences to nest on land. The estimated heat production rates on land were 7.4–10.5 times the calculated values in the sea. The theoretical prediction that temperature difference between body and water temperatures would increase according to the body size was confirmed by empirical data recorded from several species of sea turtles. Comparing previously reported data, the internesting intervals of leatherback, green and loggerhead turtles were shorter when the body temperatures were higher. Sea turtles seem to benefit from a passive thermoregulatory strategy, which depends primarily on the physical attributes of their large body masses.