13Altruism06x

13Altruism06x - Altruism = a behaviour that benefits...

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  Altruism = a behaviour that benefits recipient but  costs donor  fitness
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  Questions - can true altruism persist (evolutionarily stable)? - non-group selection mechanisms? - why is this squirrel sounding the alert?
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  3 non-group selection hypotheses H1. Alarm calls benefit INDIVIDUAL - predator leaves - but, why not let another call so you aren’t detected? H2. Reciprocal altruism - vampire bats need blood at least every 2 d - donor 6 hrs closer to starving - recipient can last another d - cheaters punished, strangers ignored
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  H3. Inclusive fitness and kin selection - r : coefficient of relatedness - probability DNA identical by descent - r between you & parent? 0.5 L - full sib? Σ 0.5 L = 0.5 - half sib? Σ 0.5 L = 0.25
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  Application - more altruism to full vs. half sibs? full sibs vs. parents? - altruism vs. selfishness? - “altruistic” when: r 2 *benefits – r 1 *costs > 0 i. altruism if costs you life, but gives half-
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This note was uploaded on 02/08/2010 for the course BIOL 3143 taught by Professor Daveshutler during the Winter '10 term at Acadia.

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13Altruism06x - Altruism = a behaviour that benefits...

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