lecture19-slides - 10/10/09 Hormones and Behavior 1:...

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10/10/09 1 Hormones and Behavior 1: Reproduction Mike Webster msw244@cornell.edu S.G. Mudd Hall W361 Tuesdays, 2-4 Slides & Handout to be posted… Whiptail Lizards Genus Cnemidophorus 2 females copulating Photo: ABC Family • Hormones are proximate mechanisms (“hows”) • Help understand some “whys” • Hormonal mechanisms themselves evolve Why Hormones? Magnificent Riflebird, Film from Macualay Library!
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10/10/09 2 Why Hormones? Hormones are “internal messages” that coordinate behavior with: • Intrinsic factors (other traits, condition, age, gender, etc.) • The external environment (time of year, weather, food) • Social environment/context Honey Bee Behavior Young Nurse Old Forager Honey Bee Behavior Juvenile Hormone (JH) low or high • Removal of corpa allata (JH glands) delays transition • JH treatment speeds trans’n Young Nurse Old Forager JH level Age
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3 Honey Bee Behavior JH levels also affected Honey Bee Behavior YN = Young Nurse OF = Old Forager
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This note was uploaded on 12/25/2009 for the course BIO 2210 taught by Professor Seeley during the Fall '08 term at Cornell University (Engineering School).

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lecture19-slides - 10/10/09 Hormones and Behavior 1:...

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