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Discuss two non-human examples of altruistic behavior and discuss in terms of evolution. Ryuya & Samata. Altruism. behavior by an animal that is not beneficial or may be harmful to itself but that benefits others of its species e xamples: birds, bats, bees. Evolution.

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discuss two non human examples of altruistic behavior and discuss in terms of evolution

Discuss two non-human examples of altruistic behavior and discuss in terms of evolution

Ryuya & Samata

altruism
Altruism
  • behavior by an animal that is not beneficial or may be harmful to itself but that benefits others of its species
  • examples: birds, bats, bees

Evolution

  • the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth
warning call of birds
Warning call of birds
  • A form of altruism called reciprocal altruism, where a organism temporary reduces its fitness, while temporary raising the fitness of another
advantage in terms of evolution and survival
Advantage in terms of evolution and survival
  • Decreases the chances that the bird giving the call, and the bird being targeted will be eaten
vampire bats desmondus rotundus
Vampire Bats (Desmondusrotundus)
  • Reciprocal altruism
    • Benefitting non-relatives at a cost to themselves
  • Vampire bats show familial altruism for kin selection
  • Genetic basis for familial altruism
    • Extended to non-relatives under conditions where there is no exploitation (starvation, etc)
    • Can occur for bats who experience repeated encounters resulting in recognition of individuality
  • Altruism is equal to what has been given before
    • Recognition and punishment of cheaters
slide8

Bats roost together for many years

  • Successfully obtain blood meal an average of only 1/3 of the nights
    • Risk of starvation if body weight falls below 80% of normal weight
  • After feeding, sharing blood with nonrelatives may increase
    • Number of repeated encounters increases
    • Previous encounters have been altruistic by both individuals
    • Recipient is close to starvation weight
  • Benefits to the recipient exceed the costs to the donor
    • Donor regurgitation costs 6 hours of time
    • Recipient of regurgitation gains 18 hours of time
works cited
Works Cited
  • http://www.merriam-webster.com/dictionary/altruism
  • http://www.merriam-webster.com/dictionary/evolution
  • http://www.newscientist.com/data/images/ns/cms/dn15083/dn15083-1_680.jpg
  • http://intranet.canacad.ac.jp:3445/BiologyIBHL2/admin/versions.html?pageid=5058