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LIFE HISTORY STRATEGY

LIFE HISTORY STRATEGY. Life History Strategy A suite of traits that improve an individual's chances of surviving and reproducing in a particular environment. COST/BENEFIT ANALYSIS. Energy commited to one function is not available for others.

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LIFE HISTORY STRATEGY

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  1. LIFE HISTORY STRATEGY

  2. Life History Strategy A suite of traits that improve an individual's chances of surviving and reproducing in a particular environment

  3. COST/BENEFIT ANALYSIS Energy commited to one function is not available for others. 2. Every evolutionary ‘choice’ has costs and benefits 3. Every organism represents a compromise of a number of evolutionary ‘choices’

  4. Macarthur and Wilson (‘70’s) - Theory of Island Biogeography r strategists K strategists Opportunistic -rapidly colonizing, fast growth Equilibrium -slower colonizing, slow growth

  5. Attributes of r and K - selected organisms

  6. Attributes of r and K - selected organisms

  7. Attributes of r and K - selected organisms

  8. Attributes of r and K - selected organisms

  9. Attributes of r and K - selected organisms

  10. Attributes of r and K - selected organisms

  11. Attributes of r and K - selected organisms

  12. Attributes of r and K - selected organisms

  13. Attributes of r and K - selected organisms Productivity

  14. Attributes of r and K - selected organisms Productivity Efficiency

  15. r - K continuum r-strategist K-strategist

  16. r - K continuum r-strategist K-strategist Frequent disturbance Less frequent disturbance

  17. Aclonal Life History recruitment Sexual reproduction Death

  18. Clonal Life History Sexual reproduction recruitment Fission Fission Fission Death

  19. Fertilization Patterns 1. External (no copulation)

  20. Fertilization Patterns 1. External (no copulation) Problems Gamete output Synchrony Gamete dispersal Gamete dilution

  21. Fertilization Patterns 1. External (no copulation) Problems 100 Gamete output % success Synchrony Gamete dispersal Gamete dilution 0.5 m Distance between individuals

  22. Fertilization Patterns 1. External (no copulation) Allee Effect Reproductive rate Number or Density

  23. Fertilization Patterns 2. Internal (no copulation) For oyster spawning video:www.umces.edu/ 2002Session/oyster.html

  24. Fertilization Patterns 2. Internal (copulation)

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