X x iguanas beer able to turn o a stress response had

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Unformatted text preview: ages? Xx . .X X Nathan Gregory What predicts survival during food shortages? CorJcosterone Dexamethasone Xx . .X X Time Baseline Post- dexamethasone Stress- induced Nathan Gregory Romero & Wikelski 2010 CorJcosterone Dexamethasone Xx . .X X Iguanas be`er able to turn off a stress response had higher survival during food shortages Time Cort (ng/mL) Baseline Post- dexamethasone Stress- induced Xx . .X X 3 2 1 0 Alive" Nathan Gregory Dead" Romero & Wikelski 2010 Tom Wheeton Personality, stress responsiveness, and disease risk Meyer Friedman Personality predicts risk of early- onset heart disease ‘HosJle’ personality type: sympatheJc acJvaJon (and cort levels) blood pressure Stable behavioral traits Low stress reacJvity/cort: High stress reacJvity/cort: -   -   -   -   -   -   -   -   Bold and aggressive High social grooming/affiliaJon Discriminate threats Lower mortality Passive/reacJve More solitary Over- react to threats Higher mortality Sapolsky 2004 Fecal cort (residual) Social dominance and hormones Dominance Rank BidirecJonal relaJonships: social rank influences hormones in male baboons Gesquiere et al. 2011 The cort response is highly variable within populaJons S Sç√ Stressed cort (ng/mL) Adélie penguins S Galápagos marine iguanas Sç√ 10 8 6 4 2 0 22 23 24 25 26 27 28 29 30 Snout-vent length (cm) Cockrem et al. 2013 Vitousek & Romero 2013 Why do individuals differ in hormones? I.  Context II.  Genes III.  Experience Why do individuals differ in hormones? I.  Conte...
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This note was uploaded on 01/13/2014 for the course BIONB 2210 taught by Professor Seeley during the Fall '10 term at Cornell University (Engineering School).

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