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Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the...
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Behavior drives morphological change during human evolution.

Luke D Fannin1,2, Chalachew M Seyoum3, Vivek V Venkataraman4

  • 1Department of Anthropology, Dartmouth College, Hanover, NH, USA.

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Behavioral drive, where diet changes precede physical evolution, is key to understanding human origins. Fossil primate data reveals dietary shifts in grass-eating occurred 700,000 years before dental changes, offering insights into evolutionary pathways.

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Area of Science:

  • Paleoanthropology and Evolutionary Biology
  • Isotopic Analysis in Paleontology

Background:

  • Evolutionary processes can involve sequential changes in behavior and morphology, termed behavioral drive.
  • Detecting behavioral drive in the fossil record is challenging due to the difficulty of independently measuring past behaviors from physical traits.
  • Understanding primate dietary evolution, particularly the consumption of graminoid plants, offers a unique window into these processes.

Purpose of the Study:

  • To investigate the evolutionary timing of dietary shifts versus morphological changes in fossil primates.
  • To test the hypothesis of behavioral drive in the context of early hominin dietary evolution.
  • To determine if changes in graminivorous (grass-eating) behavior preceded dental adaptations in cercopithecid monkeys.

Main Methods:

  • Analysis of carbon and oxygen isotope ratios in fossil cercopithecid monkey remains.
  • Integration of isotopic data with existing knowledge of hominin dietary evolution.
  • Temporal decoupling of dietary behavior (inferred from isotopes) and dental morphology.

Main Results:

  • Evidence of graminivorous behavior in fossil cercopithecid monkeys was identified.
  • Changes in graminivorous behavior were found to precede corresponding changes in dental morphology by approximately 700,000 years.
  • This temporal separation supports the concept of behavioral drive in primate evolution.

Conclusions:

  • Dietary changes, specifically the adoption of graminoid plants, likely acted as a significant driver in primate and early human evolution.
  • The findings demonstrate that behavioral shifts can precede and influence subsequent morphological evolution.
  • This study provides a framework for identifying and understanding behavioral drive in the fossil record, contributing to our knowledge of human evolution.