23 Socioendo part 2

23 Socioendo part 2 - Stress & Reproduction in Baboons...

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Win   T  Lo s s    T  Opponents with equally high levels  of T  
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Hunt      T  Gather     T  Kung! Hunter-gatherers with high  levels of T  
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 Psychological stress  Social instability  Social defeat  Loss of status  Exuberance  Social confidence  Winning experience  Rise in status T T
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Social Conflict & Dominance: Baboons
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Stress Levels in Wild Baboons Time after immobilization (hours) Testosterone Luteinizing Hormone High-ranking Low-ranking High-ranking Low-ranking immobilization on free-ranging M  baboons Sapolsky (1987)
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Stress Response CRH from hypothalamus CRH to anterior pituitary Causes release of ACTH ACTH activates adrenal gland Adrenal releases cortisol Cortisol acts on target tissues -ve feedback loop
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Unformatted text preview: Stress & Reproduction in Baboons Superior coping mechanism of dominant M may increase RS If subordinate: always stressed => increased glucocorticoid levels => LH lower => T lower => less ‘desirable’ => lower RS Stress Effects on Follicular Phase Rowell (1970) Normal cycle of 7 captive F baboons Cycle in which F was moved into or out of group or had been attacked Rank Relation with Follicular Phase r s = 0.829, P < 0.05 Mandrill Rank Relation with F Reproduction relaxed tense Compared to low-ranking FF, high-ranking FF: * begin breeding at younger ages * are more likely to support pregnancy & lactation concurrently * experience shorter inter-birth intervals * are less vulnerable to fluctuations in food supply...
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This note was uploaded on 05/31/2009 for the course BAA 171 taught by Professor Drea during the Fall '07 term at Duke.

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23 Socioendo part 2 - Stress & Reproduction in Baboons...

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