期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 12, 页码 4646-4650出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1301552110
关键词
protist microcosms; allometry; finite size scaling; body mass; cell counter
资金
- Swiss Federal Institute of Aquatic Science and Technology (Eawag) discretionary funds
- European Research Council advanced grant program through project River networks as ecological corridors for biodiversity, populations and waterborne disease [RINEC-227612]
- Swiss National Science Foundation [200021_124930/1, 31003A_135622]
- Swiss National Science Foundation (SNF) [200021_124930] Funding Source: Swiss National Science Foundation (SNF)
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.
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