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Neandertal cold adaptation: physiological and energetic factors
A Theodore Steegmann1, Frank J Cerny, Trenton W Holliday
1Department of Anthropology, 380 MFAC, SUNY Buffalo, Buffalo, New York 14261, USA. atsjr@acsu.buffalo.edu
Summary
Neandertals possessed advanced physiological cold defenses, including metabolic adaptations and genetic factors, to survive Ice Age Europe. Their survival depended on these complex adaptations rather than just physical traits.
Area of Science:
- Paleoanthropology
- Human Physiology
- Evolutionary Biology
Background:
- Neandertals inhabited cold Ice Age environments.
- Morphological traits like shorter limbs may have offered some cold resistance.
- Physiological adaptations were likely crucial for Neandertal survival in cold climates.
Purpose of the Study:
- To investigate the physiological cold defense mechanisms of European Neandertals.
- To propose a model for Neandertal cold adaptation based on morphology, metabolism, and genetics.
- To estimate the energetic costs of cold resistance for Neandertals.
Main Methods:
- Comparative analysis of Neandertal morphology with contemporary humans and primates.
- Ethnographic modeling using data from Tierra del Fuego populations.
- Estimation of daily caloric requirements based on circumpolar data.
- Proposal of specific genetic adaptations.
Main Results:
- Neandertals likely relied on a combination of physiological defenses, including metabolic adaptations like brown adipose tissue (BAT).
- Energetically expensive defenses such as vasoconstriction and vasodilation were probably employed.
- Estimated daily caloric needs ranged from 3,360 to 4,480 kcal.
- Potential genetic adaptations include stress shock proteins and specialized calcium metabolism.
Conclusions:
- Neandertal cold resistance was a complex adaptive package heavily reliant on physiological and metabolic strategies.
- While morphology played a role, physiological defenses were paramount for survival in cold environments.
- Specific genetic adaptations may have further enhanced Neandertal resilience to cold conditions.