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首页> 外文期刊>Herpetologica >Do seasonal and behavioral differences in the use of refuges by the leopard tortoise (Geochelone pardalis) favor passive thermoregulation?
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Do seasonal and behavioral differences in the use of refuges by the leopard tortoise (Geochelone pardalis) favor passive thermoregulation?

机译：豹龟（Geochelone pardalis）使用避难所的季节和行为差异是否有利于被动体温调节？

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摘要

Behavioral thermoregulation is used by tortoises (Family Testunidae) to moderate the effects of daily and seasonal fluctuations in ambient temperature on their body temperature. Extensive use is made of refuges to facilitate this behavioral thermoregulation. The Nama-Karoo in South Africa experiences wide temperature fluctuations both daily and seasonally. We investigated the seasonal use of refuges by the leopard tortoise (Geochelone pardalis) and the orientation of the tortoises with the refuges. Turtles used a wide variety of refuges, with Lycium spp. Eberlanzia ferox, Opuntica Ficus, and grass clumps being preferred. Seasonal variation in the use of refuges depeneded on whether the refuges were used as forms or shelters. Tortoises in spring and winter often remained in the same refuge for the entire season or returned to the same refuge on consecutive nights. We found seasonal and behavioral variation in (a) the orientation of the tortoises withing a refuge, and (b) the portion of the shell of each leopard tortoise within a refuge that was exposed to solar radiation. Tortoises in winter and spring maximised the amount of solar radiation received on their shells, while tortoises in summer and autumn minimized the solar radiation received. Consequently, using a combination of refuge type, and body orientation, leopard tortoises appear to passively thermoregulate and thus control for temperature fluctuations experienced in an extreme environment.
机译：陆龟（Test科）使用行为体温调节来缓解环境温度的每日和季节性波动对其体温的影响。避难所被广泛使用以促进这种行为温度调节。南非的Nama-Karoo每天和每个季节都会经历较大的温度波动。我们调查了豹龟（Geochelone pardalis）对避难所的季节性使用情况以及对带有避难所的乌龟的方向。乌龟使用了枸杞属的多种避难所。最好选择大叶草，仙人掌榕和草丛。避难所使用的季节性变化取决于避难所是用作形式还是避难所。春季和冬季，乌龟通常在整个季节都留在同一避难所中，或者在连续的夜晚返回同一避难所。我们发现了以下季节和行为方面的变化：（a）避难所的乌龟方向，以及（b）暴露于太阳辐射的避难所内每只豹龟的外壳部分。冬季和春季的乌龟将其壳上接收到的太阳辐射最大化，而夏季和秋季的乌龟则将其接收到的太阳辐射最小化。因此，结合使用避难所类型和身体朝向，豹龟似乎可以被动地进行温度调节，因此可以控制极端环境下出现的温度波动。

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