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Evolution of Cooperation

This exploration delves into the mechanisms of cooperation versus cheating within organisms, particularly focusing on mutualistic relationships. The discussion includes anaerobic methane oxidation (AOM) by sulfate-reducing bacteria and methanotrophic archaea, crucial players in reducing greenhouse gas emissions. These archaea remain difficult to culture in laboratory settings, raising questions about their metabolic interactions and the intermediates exchanged. The presentation also connects to evolutionary concepts like the Prisoner's Dilemma, Simpson's Paradox, and structured population models, providing an integrative understanding of cooperation in biological systems.

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Evolution of Cooperation

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Presentation Transcript

  1. Evolution of Cooperation • How do you direct more benefit to cooperators vs. cheaters? • How would you ever get a mutualism if both are costly?

  2. Anaerobic methane oxidation (AOM) Sulfate Reducing Bacteria methane is oxidized with sulfate as the terminal electron acceptor: CH4 + SO42- → HCO3- + HS- + H2O MethanotrophicArchaea • Important reducer of greenhouse gas emissions • (90% of marine methane from marine sediments oxidized by AMO) • Unable to culture in lab – could be obligate syntrophy • Unclear which intermediates are exchanged

  3. Structured populations and Haystack model (John Maynard Smith)

  4. Simpson’s Paradox Chuang et al, Science 2009

  5. Prisoner’s Dilemma W(defector) (Turner & Chao, 1999. Nature)

  6. “Snowdrift Game”

  7. Cooperation in Myxococcus (Kuner & Kaiser, 1982)

  8. (Fiegna & Velicer, 2003; Velicer & Yu, 2003)

  9. (Fiegna et al., 2006. Nature)

  10. Monday (11/21):Class Presentations! Monday (11/28):Evolution of Pathogens

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