Social_Behavior[1]

Social_Behavior[1] - Behavioral Ecology II Social Behavior...

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Behavioral Ecology II Social Behavior
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Characteristics of Social Animals • Cooperation among individuals, especially in rearing young • Altruistic Behaviors
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Examples of Altrusitic Behavior • Warning Calls • Defending others in a group others
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How can behaviors that are detrimental to the individual actor evolve?
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I would gladly lay down my life for two brothers or eight cousins. J.B.S. Haldane
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Kin Selection • Selection for genetic traits that favor survival and reproduction of close relatives • Increases inclusive fitness - sum of an individuals fitness plus that of close relatives Bill Hamilton published the “The genetical theory of social behavior” in 1964 when he was 27.
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Coefficient of Genetic Relatedness ( r ) • Proportion of genes that are identical in two individuals because of common ancestry • In humans, for siblings r=0.5, cousins r= 0.125, etc • If the genetic costs of an altruistic behavior to an individual is less than the benefits to kin, the behavior will be favored by kin selection Outcome Actor Recipient Selfish + - Mutualistic + + Altruistic - + Spiteful - -
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If a warning call saves a number of close kin, the behavior will be favored even if the caller dies.
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This note was uploaded on 09/23/2011 for the course BIOL 240 taught by Professor Staff during the Spring '11 term at S.F. State.

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Social_Behavior[1] - Behavioral Ecology II Social Behavior...

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