Evolution of Social Behavior

Evolution of Social Behavior - Evolution of Social Behavior...

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Lecture Topic: Natural selection normally favors behaviors that increase relative fitness of individuals but not the group What is the problem with cooperation? Alarm calls Cooperative hunting Territorial defense Food sharing Communal care of young Cooperation occurs in nature Consider the scenario Altruist’s fitness decreases Recipients’ fitness increases But both hear the call, but altruism is selected against Altruist gives alarm call Benefits to recipient/cost to altruist = 1/ cost to actor® If alarm call is sounded, family members will hear it and their fitness increases, it is likely that they would also have the trait too based on inheritance thus it would pass on No altruism toward nonkin (r = 0) Altruism biased toward close kin This is called Hamilton’s rule Consider the scenario of family being part of the group Why would altruism evolve then?
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Evolution of Social Behavior - Evolution of Social Behavior...

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