APES 3.3 Survivorship Curves

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7 Terms

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What influences species’ survival and success?

  1. Generalist or Specialist

  2. K-Selected or r-Selected

  3. Survivorship Curves

2
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Survivorship Curve

Probability of survival at different stages of life

  • Type I

  • Type II

  • Type III

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Type I Survivorship Curve

Consistent high survival → Elderly die-off

  • ~K-Selected

  • ~Specialists

  • ~Developed countries

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Type II Survivorship Curve

Constant decline in survivorship throughout lifespan 

  • Both r-Selected and K-Selected

  • Both Specialists and Generalists

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Type III Survivorship Curve

High early death rate → Long adulthood

  • ~r-Selected

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Growth of K-Selected Species

  • Low intrinsic growth rate
    → Slow population increase

  • Size determined by Carrying Capacity (K)

  • Fluctuating populations

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Growth of r-Selected Species

  • High intrinsic growth rate
    → Rapid population increase

    • → Overshoot

      • -→ Dieback