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Brain/body relations among myomorph rodents.

M D Mann1, S E Glickman, A L Towe

  • 1Department of Physiology and Biophysics, University of Nebraska Medical Center, Omaha.

Brain, Behavior and Evolution
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Brain size in rodents increases with body size, but this relationship varies significantly across different taxonomic levels. Diet also influences brain size, with folivores having smaller brains than other groups.

Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Neuroscience

Background:

  • Brain size (E) generally scales with body size (P) via a power relation (E = kPb).
  • Previous studies suggested a slope (b) near 2/3 or 3/4, implying a strong brain-body evolution link.
  • However, species-level data show variation in brain size for similar body masses and lower slopes (b ≈ 1/3).

Purpose of the Study:

  • To investigate the scaling relationship between brain and body size in rodents.
  • To determine how this relationship varies across different taxonomic levels (subspecies, genus, species).
  • To explore the influence of diet on brain size relative to body size.

Main Methods:

  • Measured cranial volumes from 1,480 skulls across 62 subspecies of cricetid and murid rodents.

Related Experiment Videos

  • Calculated scaling exponents (b) using reduced major axis regression for the entire dataset and by taxonomic partitioning.
  • Compared brain volumes among subspecies with different dietary specializations (folivorous, granivorous, insectivorous, generalist).

    • Main Results:

    • The overall scaling exponent across all specimens was b = 0.693 (near 7/10).
    • At the genus level, the exponent was b = 0.456 (near 4/9), and at the subspecies level, b = 0.338 (near 1/3).
    • Folivorous rodents had approximately 2/3 the brain size of granivorous, insectivorous, or generalist rodents of the same body weight.

    Conclusions:

    • The overall brain-body size scaling exponent does not directly reflect developmental rules at lower taxonomic levels.
    • The observed scaling may represent evolutionary pathways shaped by selective pressures on correlated traits.
    • Dietary niche is a significant factor influencing brain size relative to body size in rodents, and larger brains do not always confer a competitive advantage.