Scaling body size fluctuations
Scaling body size fluctuations
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DOI：
10.1073/pnas.1301552110
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发表时间：
2013-03-19
影响因子：
11.1
通讯作者：
Rinaldo, Andrea
中科院分区：
文献类型：
--
作者：
Giometto, Andrea;Altermatt, Florian;Rinaldo, Andrea
生物体的大小对其代谢、生长、死亡率和其他生命率很重要。无标度群落大小谱（即，在自然生态系统中经常可以观察到不同大小的生物体（无论其大小分布如何），它们是不同大小生物体相对丰度的种内和种间调节的产物。因此，物种内和物种间体型的分布是生态系统结构和功能的主要决定因素。我们的实验表明，单细胞真核生物的单物种质量分布，涵盖不同的门表现出超过四个数量级的质量特征的大小和普遍的功能。值得注意的是，我们发现，一个物种的平均大小是足以充分表征其大小分布，后者有一个普遍的形式在所有物种。我们表明，分析生理模型占观察到的普遍性，这可以合成在一个对数正态形式的种内大小分布。我们还提出了生态和生理过程应如何相互作用，以产生规模不变的社区规模谱，并讨论了我们的研究结果的影响，涉及身体质量的异速生长标度律。
The size of an organism matters for its metabolic, growth, mortality, and other vital rates. Scale-free community size spectra (i.e., size distributions regardless of species) are routinely observed in natural ecosystems and are the product of intra-and interspecies regulation of the relative abundance of organisms of different sizes. Intra-and interspecies distributions of body sizes are thus major determinants of ecosystems' structure and function. We show experimentally that single-species mass distributions of unicellular eukaryotes covering different phyla exhibit both characteristic sizes and universal features over more than four orders of magnitude in mass. Remarkably, we find that the mean size of a species is sufficient to characterize its size distribution fully and that the latter has a universal form across all species. We show that an analytical physiological model accounts for the observed universality, which can be synthesized in a log-normal form for the intraspecies size distributions. We also propose how ecological and physiological processes should interact to produce scale-invariant community size spectra and discuss the implications of our results on allometric scaling laws involving body mass.