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Keywords:

  • Body size;
  • metabolic rate;
  • scaling

Summary

  • 1
    A long-standing theoretical problem in biology is the relation between organism size M and metabolic rate Q.
  • 2
    This long history of research into such a basic pattern is due to the particular shape of the relationship: it is generally observed that the relation is well described as Q ∝ Mb where b is most often between 0·5 and 1.
  • 3
    Numerous analyses have focused on determining b using interspecific data, in particular to test whether b = 2/3 or b = 3/4.
  • 4
    Here a large amount of intraspecific data on fish are analysed, which show that b ≠2/3, b ≠ 3/4, and especially that there is no single, universal value of b.