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Extreme variation in body temperature in a nocturnal thigmothermic lizard

机译:夜间体温热蜥蜴的体温极端变化

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Nocturnal lizards inhabiting cool temperate environments potentially experience a wide range of body temperatures (Tb).We used radio telemetry to characterize field Tb in a nocturnal diplodactyl id gecko (Hoplodactylus maculatus) from ahigh-latitude (45°S), sub-alpine site in southern New Zealand. Variation in Tb within days (diel), among days and amongdifferent reproductive groups of this viviparous species (pregnant females, non-pregnant females and males) wasmeasured with temperature-sensitive transmitters. We found that surgical implantation of transmitters did not have asignificant effect on selected temperature on a laboratory gradient (T_(sel)).FieldTbvalues were examined in concert withT_(sel)and microhabitat temperature in late summer, revealing marked fluctuations of up to 30 °C inTbboth within andbetween days. When weather conditions allowed, all reproductive groups exhibited some degree of thermoregulation,with Tb generally elevated at least 4 °C above microhabitat temperature and within the bounds (central 50%) of T_(sel)atthe warmest times of day on most days. Considerable thermoregulation occurred early in the day, particularly forpregnant females, and is likely to have involved some degree of direct solar basking. Temperature telemetry revealedboth extreme variability in Tb and complexity of thermoregulatory behaviour in a primarily nocturnal, thigmothermiclizard.
机译:居住在凉爽的温带环境中的夜蜥蜴可能会经历广泛的体温(Tb)。我们使用无线电遥测技术来表征来自高纬度(45°S)高寒地区的夜生双壁真壁虎(Hoplodactylus maculatus)中的Tb场。在新西兰南部。使用温度敏感型变送器测量了该胎生物种的天数(天),天数以及不同生殖组之间的Tb变化(雌性,非雌性和雄性)。我们发现,在实验室梯度(T_(sel))上,通过外科手术植入变送器对选择的温度没有显着影响。在夏末,FieldTb值与T_(sel)和微生境温度共同检查,揭示了高达30°的明显波动在几天之内和之间。在天气条件允许的情况下,所有生殖群体都表现出一定程度的体温调节,在大多数日子中,一天中最暖和的时间,Tb通常比微生境温度至少升高4°C,且在T_(sel)的范围内(中心50%)。一天中的早些时候发生了相当多的体温调节,特别是对于怀孕的女性,并且可能涉及到某种程度的直接日晒。温度遥测表明,在主要是夜行性的,体温过大的蜥蜴中,Tb的极端可变性和温度调节行为的复杂性。

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