Opportunistic hibernation by a free-ranging marsupial
Opportunistic hibernation by a free-ranging marsupial
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自由放养的有袋动物的机会性冬眠
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
F. Geiser
中科院分区：
文献类型：
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作者：
James M. Turner;L. Warnecke;G. Körtner;F. Geiser
关于异温有袋动物在其原生栖息地的热生物学知识是稀缺的。我们的目的是研究在自由放养的西部侏儒负鼠（Cercartetus concinnus），一个小有袋类动物在澳大利亚南部的冷温带和半干旱的栖息地发现，并在人工饲养表达季节性冬眠的麻痹模式。温度遥测显示，在连续两个冬季，在地中海气候的栖息地中，7只动物中有4只同时使用短暂（24小时）的麻痹发作（持续时间分别为6.4 ± 5.4小时和89.7 ± 45.9小时）。休眠模式是高度灵活的个人之间，但低环境温度促进休眠。最大麻痹持续时间为186.0 h，最低体温为4.1 ℃。使用短回合的个人进入休眠前日出在活动期结束，而那些使用长时间的休眠进入傍晚后日落。从麻木复温通常发生在中午后不久，当每天的环境温度上升。我们提出了第一个定量数据的有袋动物物种表达机会冬眠在冬季在野外，并表明，在C. concinnus的休眠使用的强烈影响，小规模的小气候条件。
Knowledge about the thermal biology of heterothermic marsupials in their native habitats is scarce. We aimed to examine torpor patterns in the free-ranging western pygmy-possum (Cercartetus concinnus), a small marsupial found in cool temperate and semi-arid habitat in southern Australia and known to express aseasonal hibernation in captivity. Temperature telemetry revealed that during two consecutive winters four out of seven animals in a habitat with Mediterranean climate used both short ( 24 h) torpor bouts (duration 6.4 ± 5.4 h and 89.7 ± 45.9 h, respectively). Torpor patterns were highly flexible among individuals, but low ambient temperatures facilitated torpor. Maximum torpor bout duration was 186.0 h and the minimum body temperature measured was 4.1°C. Individuals using short bouts entered torpor before sunrise at the end of the active phase, whereas those using prolonged torpor entered in the early evening after sunset. Rewarming from torpor usually occurred shortly after midday, when daily ambient temperature increased. We present the first quantitative data on a marsupial species expressing opportunistic hibernation during winter in the wild, and show that torpor use in C. concinnus is strongly influenced by small-scale microclimatic conditions.