Russo Sabrina E, Robinson Scott K, Terborgh John
Department of Animal Biology, University of Illinois, Urbana, Illinois 61801, USA.
Am Nat. 2003 Feb;161(2):267-83. doi: 10.1086/345938.
We studied size-abundance relationships in a species-rich Amazonian bird community and found that the slope of the logarithmic relationship between population density and bodymass (b = -0.22) is significantly shallower than expected under Damuth's energetic equivalence rule (EER), which states that population energy use (PEU) is independent of species body mass. We used estimates of avian field metabolic rates to examine the logarithmic relationship between PEU and body mass and its variation among ecological guilds. The relationship for all species had a significantly positive slope (b = 0.46), indicating that PEU of larger species was greater than that of smaller species. Analyses of guilds revealed significant variation. The slopes of the frugivore-omnivore, insectivore, and granivore guilds were all significantly positive, with that of the frugivore-omnivore guild being the steepest. In contrast, PEU did not vary significantly with species body mass among raptors. These results were confirmed, in analyses using both species values and phylogenetically independent contrasts, and the results do not support the EER in this community. The spatial distribution of resources and mechanisms of interference competition within guilds may explain why most patterns differed from the predictions of the EER. Other sources of variation, including the effects of scale, are also discussed.
我们研究了物种丰富的亚马逊鸟类群落中的大小-丰度关系，发现种群密度与体重之间的对数关系斜率（b = -0.22）明显比达穆斯能量等效规则（EER）预期的要浅，该规则指出种群能量利用（PEU）与物种体重无关。我们利用鸟类野外代谢率的估计值来研究PEU与体重之间的对数关系及其在生态类群中的变化。所有物种的关系具有显著的正斜率（b = 0.46），表明较大物种的PEU大于较小物种。类群分析显示出显著差异。食果杂食动物、食虫动物和食谷动物类群的斜率均显著为正，其中食果杂食动物类群的斜率最陡。相比之下，猛禽的PEU随物种体重没有显著变化。在使用物种值和系统发育独立对比的分析中，这些结果得到了证实，并且这些结果不支持该群落中的EER。资源的空间分布和类群内干扰竞争的机制可能解释了为什么大多数模式与EER的预测不同。还讨论了其他变异来源，包括尺度效应。
