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A shrew-sized origin for primates.

Daniel L Gebo1

  • 1Department of Anthropology, Northern Illinois University, DeKalb, Illinois 60115, USA. dgebo@niu.edu

American Journal of Physical Anthropology
|December 18, 2004
PubMed
Summary
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The study suggests early primates were shrew-sized (10-15g), impacting their evolution. This small body size influenced metabolic rates, reproduction, and social behaviors, preceding the Eocene primate radiations.

Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Primate Evolution

Background:

  • The origin of primates is debated, with little focus on ancestral body weight's role in adaptive radiations.
  • Current models often consider larger body weights for early primates.

Purpose of the Study:

  • To reconstruct early primate evolution by considering a small ancestral body weight (10-15g).
  • To analyze the biological and ecological implications of a shrew-sized primate ancestor.
  • To sequence functional-adaptive events preceding early Eocene primate radiations.

Main Methods:

  • Comparative behavioral ecology of mouse lemurs (Microcebus) and shrews (Soricidae).
  • Assessment of arboreal models like Ptilocercus and Caluromys.
  • Reconstruction of ancestral primate traits based on small mammal analogues.

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Main Results:

  • Shrew-sized primates likely exhibited high metabolic, reproductive, and predation rates.
  • Ancestral primates probably had low population densities, solitary habits, and promiscuous mating.
  • Key adaptive events occurred at a body size below 50g, predating Eocene radiations.

Conclusions:

  • A shrew-sized ancestor provides a more plausible model for early primate evolution.
  • Small body size is critical for understanding the functional-adaptive sequence leading to primate radiations.
  • Early primate adaptations occurred below a 50g body weight threshold.