Lecture 16 (3-8)

Lecture 16 (3-8) - Human Bipedal Adaptations Need to...

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Human Bipedal Adaptations Need to maintain balance: 0. Keep head in midline of body 1. Keep upper body weight over pelvis 2. Keep legs stable to support the weight of the body Why Did Humans Become Bipedal? 0. ECOLOGICAL THEORIES: 1. developed out of environmental changes 2. Climate was becoming cooler and drier, more savannahs 3. So early hominids needed to go out and forage in the grasslands…. Evolution of Bipedalism 4. BUT: new bipedal fossils from wooded forests not savannahs ie. A. ana- mensis, and Ardipithecus ramidus 5. Maybe no ecological crisis - Non-ecological theories: 6. Heat exposure and bipedalism 7. Male Provisioning Theory: 3. bipedalism was advantageous trait for reproductive success 4. Provisioning for females to increase female fertility and ensure mating suc- cess with monogamy Male Provisioning Theory: Problems: 0. early hominids look one male-multifemale, not pair-bonded 1. Later hominins ( A. afarensis ) look sexually dimorphic, probably in social groups) 2. Modern ethnographic data (!Kung San)
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Lecture 16 (3-8) - Human Bipedal Adaptations Need to...

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