Effect of hibernation and reproductive status on body mass and condition of coastal brown bears
Effect of hibernation and reproductive status on body mass and condition of coastal brown bears
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DOI：
10.2307/3802988
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发表时间：
2000-01-01
影响因子：
2.3
通讯作者：
Hanley, TA
中科院分区：
文献类型：
--
作者：
Hilderbrand, GV;Schwartz, CC;Hanley, TA
研究了阿拉斯加基奈半岛成年母棕熊（Ursus arctos）的冬眠和繁殖状态对其体重和组成的影响。这些信息是了解野生棕熊种群营养生态学的基础。在秋季和随后的春季处理的6只成年雌性（成对样本）在bar +/- SD上损失了73 +/- 22 kg ((x)；32 +/- 10%)在208 +/- 19天内摔倒。在这些体重损失中，56 +/- 22% （55 +/- 22 kg）是脂质，44 +/- 22% （43 +/- 21 kg）是瘦体重。脂质储存的分解代谢占。88.4 +/- 8.1%的身体能量用于满足维持需求。仅在秋季（n = 21）或春季（n = 32）评估一次的成年雌性越冬体成分差异与配对样本相似。熊的相对脂肪度与冬眠期间脂肪占体重的百分比（P < 0.01）和体能损失（P < 0.01）呈正相关。因此，禁食开始时的相对脂肪会影响脂肪储存和瘦体重分解代谢的相对比例，以满足冬眠期间的蛋白质和能量需求。在春天，孤独的母熊比有幼崽或一岁幼崽的母熊有更大的恶霸和更瘦的体重。脂质含量在秋季独居雌鱼中最高。以体质和组成作为人群健康指标的研究应考虑季节或生殖阶层。
We investigated the effect of hibernation and reproductive status on changes in body mass and composition of adult female brown bears (Ursus arctos) on the Kenai Peninsula, Alaska. This information is fundamental to understanding nutritional ecology of wild brown bear populations. Six adult females handled in the fall and following spring (paired samples) lost 73 +/- 22 kg ((x) over bar +/- SD; 32 +/- 10%) of fall body mess over 208 +/- 19 days. Of this mass loss, 56 +/- 22% (55 +/- 22 kg) was lipid and 44 +/- 22% (43 +/- 21 kg) was lean body mass. Catabolism of lipid stores accounted for. 88.4 +/- 8.1% of the body energy used to meet maintenance demands. Overwinter differences in body composition of adult females assessed only once in either the fall (n = 21) or spring (n = 32) were similar to those of paired samples. Relative fatness of bears entering the den was positively related to the contribution of fat (%) to body mass (P < 0.01) and body energy (P < 0.01) losses during hibernation. Thus, relative fatness at the onset of fasting influences the relative proportion of lipid stores and lean body mass catabolized to meet protein and energy demands during hibernation. In the spring, lone females had greater bully and lean masses than Females with cubs of the lear or yearlings. Lipid content was greatest in lone females in the fall. Studies using body mass and composition as indices of population health should consider season or reproductive class.