Dual Threshold Control of Peripheral Temperature in the Lizard Dipsosaurus dorsalis
Dual Threshold Control of Peripheral Temperature in the Lizard Dipsosaurus dorsalis
复制标题
蜥蜴 Dipsosaurus dorsalis 周围温度的双阈值控制
DOI：
--
复制
发表时间：
1979
期刊：
影响因子：
--
通讯作者：
E. C. Crawford
中科院分区：
文献类型：
--
作者：
B. J. Barber;E. C. Crawford
连续比例和中性区（双阈值）温度调节的数学分析导致这些不同的控制之间的实验区分的标准。当蜥蜴在冷热环境之间穿梭时，测量了它的结肠、皮肤和头部温度。热环境温度为65 ℃时的体温分析表明，蜥蜴具有体温调节功能（P <0.05）。对47 ℃热环境下行为的进一步分析表明，从热环境和冷环境中出来时的体温有显著差异（P <0.05）。此外，当冷环境温度升高至36 ℃或热环境温度降低至43 ℃时，穿梭停止。因此，得出结论（P <0.05），体温调节不是单一设定点连续成比例的。我们的研究结果，结合那些领域和梯度观测，支持双随机阈值（DST）控制假设。出口皮肤温度不受不同热环境温度的影响;然而，随着热环境温度的增加，出口结肠和脑温度线性下降，表明外周温度受到调节。我们得出结论（P <0.001），深部体温不是主要的直接调节变量。
A mathematical analysis of continuously proportional and neutral zone (dual threshold) temperature regulation leads to criteria for experimentally distinguishing between these differing controls. Colonic, skin, and head temperatures were measured in a lizard as it shuttled between hot and cold environments. An analysis of body temperature when hot-environment temperature was 65 C shows that the lizard was thermoregulating (P < .05). A further analysis of behavior at a hotenvironment temperature of 47 C shows that the body temperatures initiating exit from the hot and cool environments were significantly (P < .05) different. Furthermore, shuttling ceased when cool-environment temperature was increased to 36 C or hot-environment temperature was lowered to 43 C. Therefore, it was concluded (P < .05) that thermoregulation was not single set-point continuously proportional. Our results, when combined with those of field and gradient observations, support a dual stochastic threshold (DST) control hypothesis. Exit skin temperature was unaffected by different hot-environment temperatures; however, as hot-environment temperature was increased exit colonic and brain temperatures decreased linearly, suggesting that peripheral temperature was regulated. We conclude (P < .001) that deep body temperature is not the major directly regulated variable.