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Anthro Lecture 1-29

Anthro Lecture 1-29 - Anthro Lecture I Sexual selection a...

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Anthro Lecture 1/29/07 I. Sexual selection a. Explaining sexual dimorphism b. Sexual selection: selection for traits that enable individuals to acquire more and/or better mates c. Intrasexual selection d. Intersexual selection e. Sex differences in parental investment other differences f. Parental investment: any investment, in time energy or risk, by a parent in an offspring that reduces the investment available for other offspring g. The sex investing more (usually females) becomes the limiting resource on the reproduction of the sex investing less h. Sex differences that are explicable by differences in parental investment: i. Size and fighting apparatus ii. Mortality rate iii. “choosiness” iv. Mate guarding i. Test cases: ‘sex-role reversed’ species (e.g. phalaropes) II. Primate Behavior a. Testing hypotheses deduced from evolutionary theory b. Three terms to distinguish i. Social interaction ii. Social relationship iii. Social organization c. Types of primate groupings i. Solitary (but still having differentiated social relationships)
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1. Orangutan, Loris ii. Monogamous, territorial pairs 1. Gibbons, Titi monkeys iii. One-male, multi-female groups (polygamy) 1. Black and white colobus, mountain gorillas iv. One-female, two-male groups (polyandry) 1. Callitrichids v. Multi-male, multi-female groups 1. Ring-tailed lemurs, savanna baboons vi. Communities (fission-fusion social organization)
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