Seasonal changes in body weight of female Asiatic black bears under captivity
Seasonal changes in body weight of female Asiatic black bears under captivity
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DOI：
10.3106/mammalstudy.24.1
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发表时间：
1999-06-01
期刊：
影响因子：
1
通讯作者：
Yasutake, Aiko
中科院分区：
文献类型：
--
作者：
Hashimoto, Yukihiko;Yasutake, Aiko
尽管众所周知，熊的体重会随着营养条件的变化而发生季节性变化，但有关亚洲黑熊（Ursus thibetanus）的体重和营养状况的信息却很少。 1995年5月至12月，我们对圈养条件下的7只雌性日本黑熊U. thibetanus japonicus进行了称重。尽管体重在年份之间没有显着差异，但根据增长率（rw）可区分三个季节阶段。在第一阶段，平均体重从 5 月（46.2+-4.4 kg，平均值+-SD，n = 6）到 8 月（57.3+-3.5 kg，n = 6：5% < rw < 10%）逐渐增加。从 8 月到 11 月，平均体重稳定（59.4+-4.3 kg，n = 4：rw < 5%）。相反，11 月和 12 月期间体重迅速增加（68.4+-4.7 kg，n = 5：10% < rw）。第一阶段体重的逐渐增加可能是因为食物充足和能量消耗较低，而第三阶段的快速增加似乎是对冬眠的适应。
Though body weights of bears are known to change seasonally responding to nutritional conditions, there is little information on the body weight and nutritional condition of Asiatic black bears, Ursus thibetanus. We weighed seven female Japanese black bears, U. thibetanus japonicus, under captive condition from May to December, 1995. Although the body weights did not differ significantly between years, three seasonal phases were distinguishable according to the increase rate (rw). During Phase I, mean body weight increased gradually from May (46.2+-4.4 kg, mean+-SD, n = 6) to August (57.3+-3.5 kg, n = 6: 5% < rw < 10%). From August to November, the mean body weights were stable (59.4+-4.3 kg, n = 4: rw < 5%). Contrary, body weights increased rapidly during November and December (68.4+-4.7 kg, n = 5: 10% < rw). The gradual body weight increase in the Phase I was probably because of sufficient food and lower energy expenditure, while the rapid increase in Phase III seems tobe an adaptation for hibernation.