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Human ecological niche expansion over 3 million years shows a preference for rough, biodiverse terrains. This pattern contracted around 1.1 million years ago before a subsequent expansion into harsher climates.

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Area of Science:

  • Paleoanthropology
  • Human Ecology
  • Evolutionary Biology

Background:

  • Humanity's ecological niche has expanded over 3 million years, adapting to diverse environments.
  • The temporal dynamics and drivers of this niche expansion are not well understood.

Purpose of the Study:

  • To investigate the evolution of human habitat preferences over the past 3 million years.
  • To identify environmental and climatic factors influencing human niche expansion and contraction.

Main Methods:

  • Combined archaeological data with landscape topography, climate, and biome simulations.
  • Analyzed spatial clustering of human sites in relation to terrain roughness and biodiversity.
  • Utilized statistical analysis to track changes in habitat preferences over time.

Main Results:

  • Human sites initially clustered in rough, biodiverse areas, peaking around 1.1 million years ago (Ma).
  • A niche contraction occurred from 1.1 Ma to 0.8 Ma, coinciding with the Mid-Pleistocene Transition and population bottlenecks.
  • Post-0.8 Ma, human species (e.g., Homo heidelbergensis, Homo neanderthalensis, Homo sapiens) adapted to rougher terrains, colder/drier conditions, and increased ecological diversity.

Conclusions:

  • Human niche expansion is characterized by dynamic shifts in habitat preference, influenced by environmental changes.
  • The Mid-Pleistocene Transition marked a significant period of ecological niche contraction and subsequent adaptation.
  • Later human species demonstrated remarkable adaptability to challenging environments, expanding into diverse ecological zones.