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Cooperation. Hear it. Web cam. Paul Sherman. Benefits of cooperation:. 1) Direct benefits. Benefits of cooperation:. 2) Reciprocity. Bonobos : steep dominance hierarchy; Food sharing only under pressure Dominant individuals gain, others lose, no reciprocity

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Presentation Transcript
slide4

Web cam

Paul Sherman

benefits of cooperation
Benefits of cooperation:
  • 1) Direct benefits
slide7

Bonobos: steep dominance hierarchy;

    • Food sharing only under pressure
    • Dominant individuals gain, others lose, no reciprocity
  • Chimps: shallow dominance hierarchy;
    • Food sharing is more common
    • Past food received was best predictor of food giving
slide9

Regurgitators are more likely to be related and more likely to be roostmates than the general population

slide10

Vampire bats display all the requirements for reciprocal altruism

    • Stable group
    • Many chances for altruism through lifetime (20 yr)
    • Individuals remember
    • Donor and recipient have a symmetrical relationship
    • However, feedings between non-kin are very rare!
slide11

9 bats held in captivity

  • Food withheld from a different individual each night
  • Regurgitation events recorded
  • Hunger did not dictate if individuals received help from cagemates
  • Hungry individuals were more likely to receive help from an individual they had fed before
benefits of cooperation2
Benefits of cooperation:
  • 3) Benefits to relatives (Kin selection)
would you lay down your life for your brother
Would you lay down your life for your brother?
  • No, but I would lay down my life for two brothers or eight cousins…
      • JBS Haldane