Lecture 26-Kin Selection

Lecture 26-Kin Selection -...

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Orchids and wasps - pseudocopulation http://www.youtube.com/watch?v=-h8I3cqpgnA Hoverflies and irises - coevolution of plant and pollinator http://www.youtube.com/watch?v=MQlq5QtRI9o Also, various bird stuff: The chainsaw-imitating lyrebird - not sure how relevant this is to anything in class but it is SO cool! http://www.youtube.com/watch?v=VjE0Kdfos4Y Pheasants and widowbird - mating displays in birds http://www.youtube.com/watch?v=gqsMTZQ-pmE Cuttlefish are so adorable! http://www.pbs.org/wgbh/nova/camo/change.html
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Kin Selection and Social Behavior Living together can lead to: Fights over territories Working together to fight predators Caring for offspring
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Kin Selection and Social Behavior Sociality can lead to conflict
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Kin Selection and Social Behavior Sociality can lead to cooperation
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Types of Social Interactions Actor Benefits Actor is Harmed Recipient benefits Cooperative Altruistic Recipient is harmed Selfish Spiteful
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Altruism When one animal helps another Share food Form friendships Warn about enemies Fight enemies May not benefit the helper
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Altruism Cooperative raising of young Scrub jays Tamarin monkeys
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Reciprocal Altruism Altruism between unrelated individuals Can evolve if: Recipient benefits are high Costs to actor are low Costs to actor are low and future benefits are later returned
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Allogrooming in chimpanzees
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Food sharing in vampire bats http://www.conservationcentre.org/images/vamclose.jpg
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Altruism Decreases personal fitness So why do it?
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Lecture 26-Kin Selection -...

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