Evolutionary Theory Part 2. Goals for today. Kin selection and reciprocal altruism How do you assess adaptive value of a behavior? Look at some behavioral examples Introduce some models to explain primate behavior. Kin selection. A form of Natural selection
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Graph Strier pg 123
Altruism-an act that benefits the helper at some cost but helps the receiver.
Selfish-acting on your own self interest to improve your fitness at cost to other’s fitnessBehavioral choices...
Degree of relatedness between actor and receiver
Act’s benefit to receiver’s fitness
Act’s cost to actor’s fitness
R = .5
Benefits to helper’s fitness should be at least twice the cost.
Half brothers helping rear offspring
R = .25
Benefits to helper’s fitness should be at least four times the cost.
Yereon- dom. male
Nikkie- dom. male
No female support
Yereon and Nikkie
Luit and Nikkie form
Coalition, Nikkie gains
Luit- dom. Male
Luit, Nikkie then