The allometry of daily energy expenditure in hummingbirds: An energy budget approach
The allometry of daily energy expenditure in hummingbirds: An energy budget approach
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蜂鸟每日能量消耗的异速生长：一种能量预算方法
DOI：
10.1111/1365-2656.13185
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发表时间：
2020
影响因子：
4.8
通讯作者：
Wang, Dehua
中科院分区：
文献类型：
--
作者：
Shankar, Anusha;Powers, Donald R.;Dávalos, Liliana M.;Graham, Catherine H.;Wang, Dehua
分支内异速生长关系代表了能量和大小之间的标准比例定律，其离群值为生理和生态研究提供了新的途径。根据代谢水平边界假设，当由表面相关过程驱动时，代谢率作为质量的函数预计将接近0.67（例如热通量或水通量），而体积相关过程在鸟类中，每日能量消耗（DEE）与体重（M）的关系，与驱动关系的表层过程相一致。然而，分类群特异性模式与所有鸟类的比例斜率不同。蜂鸟在所有脊椎动物中具有最高的质量特异性代谢率。以前对一些蜂鸟物种的研究，没有考虑到蜂鸟的繁殖，估计蜂鸟的DEE-体重关系是。与理论预期相反，该斜率>1表明较大的蜂鸟比较小的蜂鸟代谢效率低。我们收集了12种蜂鸟的DEE和质量数据，结合已发表的数据，代表了9个蜂鸟分支中的8个分支的17种蜂鸟，其体型大小范围为6倍（2.7-17.5 g）。在考虑系统发育相关性后，我们发现DEE量表的体重为。这个0.95的斜率低于之前对蜂鸟的估计，但远高于所有鸟类的斜率（0.68）。高斜率的休眠，盘旋和飞行可能解释高种间DEE斜率蜂鸟相比，其他恒温动物。
Within‐clade allometric relationships represent standard laws of scaling between energy and size, and their outliers provide new avenues for physiological and ecological research. According to the metabolic‐level boundaries hypothesis, metabolic rates as a function of mass are expected to scale closer to 0.67 when driven by surface‐related processes (e.g. heat or water flux), while volume‐related processes (e.g. activity) generate slopes closer to one.In birds, daily energy expenditure (DEE) scales with body mass (M) in the relationship , consistent with surface‐level processes driving the relationship. However, taxon‐specific patterns differ from the scaling slope of all birds.Hummingbirds have the highest mass‐specific metabolic rates among all vertebrates. Previous studies on a few hummingbird species, without accounting for the phylogeny, estimated that the DEE–body mass relationship for hummingbirds was . In Contrast to the theoretical expectations, this slope >1 indicates that larger hummingbirds are less metabolically efficient than smaller hummingbirds.We collected DEE and mass data for 12 hummingbird species, which, combined with published data, represented 17 hummingbird species in eight of nine hummingbird clades over a sixfold size range of body size (2.7–17.5 g).After accounting for phylogenetic relatedness, we found DEE scales with body mass as . This slope of 0.95 is lower than previously estimated for hummingbirds, but much higher than the slope for all birds (0.68). The high slopes of torpor, hovering and flight potentially explain the high interspecific DEE slope for hummingbirds compared to other endotherms.