ANT-2301 Lecture Notes - Parental Investment, Reciprocal Altruism, Kin Selection

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Ant notes 10-15: females- 9 month minimum investment to produce offspring. Energy- production of age: males: time minutes. Energy- teaspoons of fluid: trivers- any investment by the parent in an individual offspring that increases the offspring"s chance of surviving at the cost of the parent"s ability to invest in other offspring, trade-off"s. Time and energy invested in 1 offspring. More care required = greater parental investment = fewer offspring > lower rs. Less care required= less parental investment = more offspring. Many dependent on females: birds- external care means both sexes can invest, mammals> humans> internal care> only females. Interest and receptivity to sexual offers should differ b/tween males and females. Males should be more easily aroused after mating. Males should be more receptive to sexual offers. Coolidge effect: males are often re-aroused by the sight: contrast effects of a novel female. Kenrick examined the effects of exposure to attractive nude females on male sexual attraction judgments.

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