Lecture17 - BioNB 2210: Lecture 17 Oct. 3, 2011 Lecture 17:...

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BioNB 2210: Lecture 17 Oct. 3, 2011 Lecture 17: Sexual Selection II - Male-Male Competition Professor Paul Sherman Learning Objectives 1. To understand the ecological and social forces that determine animal mating systems 2. To understand the effects of male-male competition on males’ morphological traits, life history characteristics, and behavioral tactics A. Four main types of mating systems occur, each depending on the distribution of females or resources critical to females. 1. Resources Clumped and Defendable: Resource Defense Polygyny. Males gain access to females indirectly, by monopolizing access to resources that are valuable to females. 2. Females Clumped and Defendable: Female Defense Polygyny. Males gain access to females directly by keeping rivals away from areas where groups of females occur. Neither Resources nor Females Clumped or Defendable 3. Females Mobile: Lek polygyny. Males defend locations where mobile females are likely to be encountered. 4. Females not Mobile:
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Lecture17 - BioNB 2210: Lecture 17 Oct. 3, 2011 Lecture 17:...

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