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3.9-Reproduction - Reproduction Thursday March 12th 2009 1...

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Reproduction Thursday March 12 th 2009 1. Overview Reproductive Strategies Social organizations: exclusion, emigration (who has to leave the group, how to avoid incest), dominance, inhibition Mate selection: Sexual dimorphism, female choice Sexual behavior Mating Seasonality Puberty Endocrinology (hormones and behavior) Social composition of grop greatly affects reproduction (ie if there is only 1 male in a group, they will be the one to reproduce In experiment, alpha watched from other cage, beta wouldn’t mate with female, when alpha was taken out, beta did then Males will mate with older more dominant females Females passed on dominance to her kids 2. Seasonal Breeding Annual reproductive cycle – season could be 2-5 months- varies by species Monkeys and prosimians stop sex when pregnant, chimps go for another 2 months Births oriented to the wet season Monkeys have a 6 month pregnancy, followed by a 6 month period of nursing. Rate of 1 baby per year Don’t have much sex, only when the female is cycling a few times a year. Only OWM have menstrual bleeding Seasonal polyestrus- cycle only during mating season
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