12_SocialEvol

12_SocialEvol - 1 Evolution of Social Behavior 51.5 51.6...

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Unformatted text preview: 1 Evolution of Social Behavior 51.5, 51.6 and R3 2 Evolution of Social Behavior • Sexual Selection • Kin Selection & Social Interactions • Human Sociobiology 3 Sexual Selection • Selection for mating success • May oppose natural selection 4 Sexual dimorphism Long-tailed widow birds 5 Asymmetries in sexual reproduction • Females typically have larger parental investment (“sperm is cheap”) • Female reproductive success low and stable- limited by number of pregnancies she can carry • Male reproductive success highly variable - limited by number of successful matings 6 Asymmetric sexual reproduction in newts 7 In newts, having more mates is more important for males than females 8 Sex role reversal in seahorses and pipefish • Males carry young in pouch and provide all parental care QuickTime r and a TIFF (Uncompressed) decompressor are needed to see this picture. 9 Asymmetric sexual reproduction in pipefish 10 In pipefish, having more mates is more important for females than males 11 Consequences of reproductive asymmetry • Sex with low PI should be competitive • Sex with high PI should be choosy 12 Male-male competition QuickTime ÷ and a Sorenson Video 3 decompressor are needed to see this picture. 13 Even sperm is competitive! 14 Male-male competition can extend beyond conception resulting in infanticide QuickTime ~ and a TIFF (Uncompressed) decompressor are needed to see this picture. 15 Consequences of reproductive asymmetry • Sex with low PI should be competitive • Sex with high PI should be choosy 16 • Choosy females may get better genes for their offspring QuickTime Þ and a TIFF (Uncompressed) decompressor are needed to see this picture. 17...
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12_SocialEvol - 1 Evolution of Social Behavior 51.5 51.6...

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