lecture11 - strong sexual selection on males. Strong sexual...

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BioNB 221: Lecture 11 Sept. 22, 2008 Page 1 Lecture 11: Lek Mating Dr. Edwin Scholes 1. Introduction A lek is a male display aggregation that females attend for the purpose of mating. Lek mating systems occur when males can’t establish territories to defend resources, when females do not live in defensible groups, and when there is no need for paternal care of young. 2. Why do males aggregate in leks? Hotspots: males cluster in areas frequented by females Hotshots: subordinate males cluster around successful/attractive males Female preferences: a group of males facilitates female choice 3. Consequences of Lekking: Females are “emancipated” from male control Opportunities for females to compare phenotypic traits of many males creates
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Unformatted text preview: strong sexual selection on males. Strong sexual selection leads to exaggerated traits in males that facilitate female ability to assess genetic quality. As a result, most lek species are highly sexually dimorphic in size and ornamentation. 4. Examples of lekking species: Birds of Paradise Neotropical Manakins Hammer-headed Bat Sage Grouse 5. Leks and theories of intersexual selection 1. Are females unanimous about preferred males? 2. Which traits do females use and are these exaggerated ones? 3. Are favored traits indicators of genetic quality? 4. Why doesnt genetic variation get used up? BioNB 221: Lecture 11 Sept. 22, 2008 Page 2...
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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 University (Engineering School).

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lecture11 - strong sexual selection on males. Strong sexual...

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