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Related Experiment Videos

Scaling metabolic rate fluctuations.

Fabio A Labra1, Pablo A Marquet, Francisco Bozinovic

  • 1Center for Advanced Studies in Ecology and Biodiversity and Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago CP 6513677, Chile.

Proceedings of the National Academy of Sciences of the United States of America
|June 21, 2007
PubMed
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Metabolic rate fluctuations in vertebrates exhibit a universal tent-shaped distribution with power-law decay, regardless of body size or species. This suggests common underlying principles govern individual organism function.

Area of Science:

  • Complex Systems Biology
  • Physiology
  • Ecology

Background:

  • Complex systems, including ecological and economic ones, often display macroscopic quantity fluctuations following non-Gaussian, tent-shaped probability distributions with power-law decay.
  • These patterns suggest universal mechanisms govern fluctuations, independent of specific system details.

Purpose of the Study:

  • To investigate if metabolic rate fluctuations in individual organisms represent an emergent property of a complex system.
  • To test the hypothesis that metabolic rate fluctuation distributions are universal across different body sizes and taxonomic groups.

Main Methods:

  • Analysis of metabolic rate fluctuation data from 71 individuals across 25 vertebrate species (birds, mammals, lizards).
  • Statistical examination of probability distribution shapes and scaling relationships.

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Main Results:

  • Metabolic rate fluctuations consistently followed a tent-shaped distribution with power-law decay across all studied individuals and species.
  • The standard deviation of these fluctuations showed power-law decay with average metabolic rate (exponent -0.352) and body mass (exponent -1/4).
  • Rescaling of fluctuation distributions from different organisms yielded a single parent distribution.

Conclusions:

  • Metabolic rate fluctuations in vertebrates exhibit universal characteristics, supporting the hypothesis of common underlying principles.
  • These findings suggest that metabolic rate can be viewed as an emergent property governed by general laws of complex systems.
  • The universality observed implies shared regulatory mechanisms across diverse vertebrate organisms.