lecture12

lecture12 - BioNB 221: Lecture 12 Sept. 24, 2008 Lecture...

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Sept. 24, 2008 Page 1 Lecture 12: Sexual Selection II: Male-Male Competition Professor Paul Sherman A. Males compete with each other to gain sexual access to multiple females (polygyny). 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: Scramble competition polygyny. Males search for scattered, non-mobile females. 1. Resource Defense Polygyny: The Bullfrog
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This note was uploaded on 08/28/2008 for the course BIO 2210 taught by Professor Seeley during the Fall '08 term at Cornell.

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lecture12 - BioNB 221: Lecture 12 Sept. 24, 2008 Lecture...

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