A Study of Fasting in Tree Sparrows (Spizella arborea) and Dark-Eyed Juncos (Junco hyemalis): Ecological Implications
A Study of Fasting in Tree Sparrows (Spizella arborea) and Dark-Eyed Juncos (Junco hyemalis): Ecological Implications
复制标题
树麻雀 (Spizella arborea) 和黑眼灯笼草 (Junco hyemalis) 禁食的研究：生态意义
DOI：
10.1093/auk/99.2.299
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
E. Ketterson
中科院分区：
文献类型：
--
作者：
M. Stuebe;E. Ketterson
ABSTm·CT.--尽管在冬季分布，栖息地选择和食物选择相似，黑眼容科斯（]unco hyemalis）和树麻雀（Spizella arborea）在冬季储存脂肪的程度不同，容科斯积累更大的商店。预计树麻雀可能有一些方法来保存能量在禁食，因此不会受到不利的天气时，阻止喂养，我们比较了物种的体重减轻，体温，和运动活动在禁食，并指出相对禁食耐力。由于这两个物种在冬季表现出性别比例的地理差异，我们也进行了性别比较，预计男性将能够比女性更长时间的快速。这些物种对禁食的反应相似，表现为（a）降低体温，尤其是在夜间，（B）变得过度活跃，随着禁食时间的增加，这种反应逐渐增强。树麻雀并没有表现出更大程度的这些反应（尽管它们更快地变得过度活跃），并且不能像容科斯那样长时间禁食。没有观察到禁食能力的性别差异。由于脂肪积累趋势的物种特异性差异不能归因于禁食时能量消耗的差异，至少在实验室中，其他解释被认为是。1981年6月22日接收，1981年9月21日接受。
ABSTm•CT.--Despite similarities in winter distribution, habitat selection, and food choice, Dark-eyed Juncos (]unco hyemalis) and Tree Sparrows (Spizella arborea) differ in the extent to which they store fat during winter, with juncos accumulating reater stores. Anticipating that Tree Sparrows might have some means of conserving energy during fasting and thus suffer no disadvantage when weather prevents feeding, we compared the species for weight loss, body temperature, and locomotor activity during fasting and noted relative fasting endurance. Because both species exhibit geographic variation in sex ratio during winter, we also made sexual comparisons, anticipating that males would be able to fast longer than females. The species responded similarly to fasting by (a) lowering body temperature, especially at night, and (b) becoming hyperactive, progressively more so as fasting time increased. Tree Sparrows did not exhibit these responses to a greater degree (although they became hyperactive sooner) and were not able to fast as long as juncos. No sexual differences in fasting ability were observed. Because the species-specific difference in tendency toward fat accumulation cannot be attributed to differences in energy expenditure while fasting, at least in the laboratory, other explanations are considered. Received 22 June 1981, accepted 21 September 1981.