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Hominin life history: reconstruction and evolution
Shannen L Robson1, Bernard Wood
1Department of Anthropology, University of Utah, Salt Lake City, UT 84112, USA. robson@umnh.utah.edu
Journal of Anatomy
|April 3, 2008
Summary
Hominin life history evolved slowly, with modern humans exhibiting uniquely extended post-reproductive lifespans and earlier maturity due to cooperative breeding. Fossil evidence reveals distinct life history patterns in extinct hominins, differing from modern humans and apes.
Area of Science:
- Paleoanthropology and Evolutionary Biology
- Demographic Life History Theory
- Primate Evolution
Background:
- Reconstructing hominin evolutionary history relies on integrating extant and fossil evidence.
- Life history theory distinguishes core life history variables from related proxies like body mass and brain growth.
Purpose of the Study:
- To reconstruct the evolutionary trajectory of hominin life history.
- To infer life history parameters in fossil taxa using demographic theory and fossil evidence.
- To compare great ape and modern human life history traits and identify derived hominin characteristics.
Main Methods:
- Utilized demographic life history theory to analyze traits such as weaning age, sexual maturity, and lifespan.
- Examined life history-related variables (body mass, brain growth, dental development) as proxies for inferring fossil hominin life history.
- Compared life history variables of modern great apes (Pan-Homo clade) with fossil hominin data.
Main Results:
- All great apes, including the last common ancestor of Pan-Homo and stem hominins, exhibit slow life histories.
- Modern humans display even slower life histories, characterized by extended post-menopausal lifespans and later maturity, suggesting reduced adult mortality.
- Body mass is the most reliable predictor of life history events in great apes; brain growth and dental development are weaker proxies.
- Fossil hominins prior to the transitional grade show no significant deviation from the primitive Pan-Homo life history pattern.
- Transitional hominins (e.g., Homo erectus, Homo antecessor) exhibit life history patterns inconsistent with modern humans.
- Homo heidelbergensis and Homo neanderthalensis show life history traits consistent with modern humans, but sample sizes are limited.
- Extinct hominin subclades, such as Paranthropus, possess unique dental life history patterns distinct from modern humans and chimpanzees.
Conclusions:
- Modern human life history, marked by reduced adult mortality, short interbirth intervals, and early weaning, is likely derived from cooperative breeding.
- Inferences about fossil hominin life history from proxies like brain size and dental development should be made cautiously.
- Accumulating fossil data reveals diverse hominin life histories, some not conforming to any living model, highlighting evolutionary divergence.
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