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13_SocialEvol - Evolution of Social Behavior 51.4 51.5 and...

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1 Evolution of Social Behavior 51.4, 51.5 and R3
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2 Evolution of Social Behavior Sexual Selection Kin Selection & Social Interactions Human Sociobiology
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3 Sexual Selection Selection for mating success May opposenatural selection May lead to sexual dimorphism Long-tailed widow birds
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4 Asymmetries in sexual reproduction Females typically havelarger parental investment or PI (“spermis cheap”) Femalereproductivesuccess low and stable- limited by number of pregnancies shecan carry Malereproductivesuccess highly variable- limited by number of successful matings
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5 Asymmetric sexual reproduction in newts
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6 In newts, having moremates is moreimportant for males than females
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7 In somespecies, sex roles reverse In seahorses and pipefish, males carry young in pouch and provide all parental care QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture.
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8 When PI reverses, asymmetries in mating and reproduction also change
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9 In pipefish, having more mates is more important for females than males
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10 Consequences of reproductive asymmetry Sex with low PI should be competitive Sex with high PI should be choosy
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11 Male-male competition QuickTimeª and a Sorenson Video 3 decompressor are needed to see this picture.
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12 Even sperm is competitive!
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13 Male-male competition can extend beyond conception resulting in infanticide QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture.
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