lecture17-slides - 10/6/09 Lecture 17 (10/5/09) Sexual...

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10/6/09 1 Lecture 17 (10/5/09) Sexual Selection II: Male-Male Competition Paul Sherman (Note: Copyrighted photos shown in the lecture have been removed due to legal restrictions on their use) Sexual Selection - Selection for traits that increase the mating success of some individuals over others of the same sex
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10/6/09 2 Why do males compete? - To gain sexual access to multiple females (polygyny) What do males compete for? - Females or resources critical to females
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10/6/09 3 Males gain access to females indirectly, by monopolizing access to resources that are valuable to females Resource Defense Polygyny In Bullfrogs, bigger males get better territories where there is less predation by leeches (Howard 1978)
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10/6/09 4 Bigger male bullfrogs lose fewer eggs and have higher RS Males gain access to females directly by keeping rivals away from areas where groups of females occur Female Defense Polygyny (aka “Harem Polygyny”)
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10/6/09 5 Female Defense Polygyny (Carrick et al. 1962 ) Males defend locations where mobile females are likely to be encountered Lek Polygyny
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6 (Floody & Arnold 1975)
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lecture17-slides - 10/6/09 Lecture 17 (10/5/09) Sexual...

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