BIOLOGY 1M03 Lecture Notes - Lecture 13: Savanna, Menopause, Shared Parenting
11 Aug 2018
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If the fitness benefit to the recipient > the fitness cost to the donor, both participants will gain if the help is reciprocated at a later date: cooperation with a time delay. Feed on blood, cannot survive > 3 days without feeding: associate with kin and non-kin roost mates, regurgitate blood to kin (give blood to family, also regurgitate to non-kin who regurgitate to them (forming alliances with friends) Why warn others: reciprocal altruism or other forms of reciprocity, benefit for some individuals to be in large groups or to protect some group members. Natural selection for larger brain size: complex foraging, cooperative breeding and complex social interactions (associated social competition, cooking with fire. Constraints on brain size increase: temperature sensitivity of the brain, high metabolic cost of the brain (20% of resting metabolic cost, 2. 5% of body weight, 1st brain size increase corresponds to increased meat consumption- high quantity of food.
