Lecture19 - 1 Lecture 19 Reciprocal Altruism Life History...

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Lecture 19: Reciprocal Altruism & Life History Evolution Monday, March 3rd Readings: 13.3 & 13.4 1
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Learning Objectives 1. Identify and explain the conditions under which altruistic behaviour between non- relatives is thought to evolve. 2. Explain why life histories represent evolutionary compromises. 3. Describe Lack’s hypothesis and suggest an explanation for why we often see conflicting results in tests of this hypothesis. 4. Identify the assumptions made and the method used by Smith & Fretwell to 2
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Example of Spite in Bacteria Spite = behaviour that involves a fitness cost for both the recipient and the actor Bacterial cells will sacrifice themselves to release toxins deadly to neighbouring strains Can be explained by kin selection…? Majeed et al. 2011 3
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Altruism The evolution of apparently costly behaviours within small and closely related groups can usually be explained by kin selection Costly behaviours within larger and less closely related groups can usually be explained by reciprocal altruism Trivers (1971) proposed that individuals will be altruistic if they will later be beneficiaries of altruistic acts 4
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Baboons do each other favours including grooming and providing support in aggressive encounters Reciprocal altruism Thanks bro! I’ve totally got your back.
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  • Spring '11
  • DAVIDSON
  • reciprocal altruism, clutch size, Altruism & Life History

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