lecture31-slides - 11/19/09 Lecture 31 (11/9/09):...

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11/19/09 1 Lecture 31 (11/9/09): Eusociality Paul Sherman (Note: Copyrighted photos shown in the lecture have been removed due to legal restrictions on their use) The social insects puzzled Charles Darwin for two reasons: 1. How could reproductive self-sacrifice evolve? How could natural selection favor suicide (e.g., by worker honey bees)? 2. How could extremely specialized morphologies and behaviors (e.g., “castes” of social insects) evolve among individuals that never directly reproduced?
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11/19/09 2 1. Group Living 2. Reproductive Division of Labor (Skew) 3. Overlap of > 2 Generations (parents and offspring live together) 4. Cooperation in Caring for Young Defining Characteristics of Eusociality (“true” sociality) Two main groups of eusocial insects: 1.Order Hymenoptera: ants, bees, and wasps 2.Order Isoptera (termites)
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11/19/09 3 Hymenoptera (ants, bees, wasps) Most Eukaryotes (e.g., birds, mammals, fishes, frogs, humans) Hymenoptera (ants, bees, wasps) Most Eukaryotes (e.g., birds, mammals, fishes, frogs, humans) W. D. Hamilton’s Insight
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11/19/09 4 (also Honeycutt, EAB p. 300)
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lecture31-slides - 11/19/09 Lecture 31 (11/9/09):...

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