The pyrophilic primate hypothesis.

Area of Science:

• Paleoanthropology
• Environmental History
• Evolutionary Biology

Background:

• The evolution of fire control in genus Homo is a key event in human evolution, yet the precise mechanisms remain unclear.
• Existing hypotheses often propose accidental discovery of fire by early hominins.
• Understanding the environmental context is crucial for reconstructing the origins of pyrotechnology.

Observation:

• Tropical Africa experienced rapid environmental shifts between forests, woodlands, and grasslands 2-3 million years ago.
• Decreasing atmospheric carbon dioxide levels contributed to changes in regional fire regimes.
• These environmental changes led to an increased frequency of natural fires.

Findings:

• An alternative scenario suggests hominin fire dependence arose from adapting to these progressively fire-prone landscapes.
• Optimal foraging theory models indicate benefits for ancestral hominins in a fire-altered environment.
• This adaptation likely played a role in the transformation of hominins into active pyrophiles.

Implications:

• Hominin dependence on fire for survival may have driven rapid expansion out of Africa.
• This research reframes fire evolution from accidental discovery to adaptive environmental response.
• The study highlights the interconnectedness of environmental change and human evolutionary trajectories.