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Both Diet and Sociality Affect Primate Brain-Size Evolution.

Mark Grabowski1,2, Bjørn T Kopperud3,4, Masahito Tsuboi2,5

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This summary is machine-generated.

Primate brain size evolved due to sociality and diet. More complex social structures correlate with larger brains, while a folivorous diet is linked to smaller brains, challenging previous hypotheses.

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Area of Science:

  • Evolutionary biology
  • Primatology
  • Neuroscience

Background:

  • Increased primate brain size is linked to cognitive benefits but incurs high energetic costs.
  • Previous research on factors influencing primate brain evolution (diet, sociality) yielded equivocal results.

Purpose of the Study:

  • To investigate the influence of diet and sociality on primate brain size evolution.
  • To jointly account for adaptation and phylogeny in analyzing brain size shifts.

Main Methods:

  • Phylogenetic comparative methods were employed using a large dataset of primate brain and body sizes.
  • Newly compiled data on primate diet and sociality levels were integrated into the analysis.

Main Results:

  • Both sociality and diet significantly influenced primate brain size evolution.
  • Increased social complexity correlated with relatively larger brains.
  • A shift towards a folivorous diet was associated with relatively smaller brains.

Conclusions:

  • Sociality plays a key role in primate brain size evolution, supporting the social-brain hypothesis.
  • Digestive costs associated with folivory may explain smaller brain sizes in these primates, modifying ecological hypotheses.
  • The study highlights the interplay of ecological and social factors in shaping primate brain evolution.