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Lecture 16

Biology 1001A Lecture 16: Lecture 16 - Cooperation and Conflict, Bio 1001A

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Western University
Biology 1001A
Scott Mac Dougall- Shackleton

Lecture 16- Cooperation and Conflict Nov.10/2016 Outcomes Whether a particular social behaviour represents cooperation, competition, spite or altruism Social interaction is classified based on recipient fitness and actor fitness. The recipient is the one receiving the behaviour, the actor is the one behaving. Selection acts depending on if the fitness of the actor increases or decreases. Actor fitness increases Actor fitness decreases Recipient fitness increases Cooperation Altruism Recipient fitness decreases Selfishness Spite Why "altruistic" and "spiteful" behaviours are both difficult to reconcile with natural selection Cooperation and selfishness are easy to reconcile w natural selection because the individual benefits. On the other hand, altruism and spite are difficult to reconcile. Spite almost is non-existent in the animal species because it reduces the fitness of everyone involved and selection is not favoured. Altruism (not considering parental care); individuals may provide warning calls/ protection for non-offspring (eg. meerkats, ground squirrels); benefits fitness of recipient, but puts the individual actor at risk. How can traits spread if they reduce the actor’s lifetime reproductive success? This means sacrificing individual fitness for the good of the group. But selection will not favour this behaviour because it just looks at the individual. How kin selection theory explains the
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