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Human Life Tables and Survivorship Curves

Human Life Tables and Survivorship Curves. Three questions we are addressing in this lab. Do females live longer than males on average? Do the child bearing years lead to greater mortality among females than males?

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Human Life Tables and Survivorship Curves

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  1. Human Life Tables and Survivorship Curves

  2. Three questions we are addressing in this lab • Do females live longer than males on average? • Do the child bearing years lead to greater mortality among females than males? • Is the life span of people who were buried in newer cemeteries greater than those who were buried in older cemeteries?

  3. Survivorship curves will help us answer these questions What are survivorship curves? • Graphs made from life tables that show the survivorship (log # of survivors) in each age group. • There are 3 basic types…

  4. Type I (convex) • Many mammals show this type of survivorship. • Most individuals will live a long time and die in the largest age groups.

  5. Type II (straight/linear) • Many song birds and seeds in a soil seed bank show this type of survivorship. • There is a constant rate of survival, for example, 10% survive each age group.

  6. Type III (concave) • Many invertebrates and marine fish show this type of survivorship. • Most individuals die as juveniles.

  7. Which do we predict to find?

  8. Why might men live longer than women?

  9. Risks associated with childbirth

  10. Why might women live longer than men?

  11. Risky behavior

  12. Smoking

  13. Homicide and suicide

  14. Alcohol

  15. War

  16. Toxic effects of testosterone

  17. Why has human life expectancy increased over the last several decades?

  18. Improvements in medicine, nutrition, and sanitation

  19. Methods • Work in pairs • Choose a row of headstones, respectfully walk down the row, and record the data listed on the data sheet (sex, YEAR of death, YEAR of birth). • Choose headstones by recording the next one you come to. Include infants. • Record data for 50 males and 50 females. • Be careful of incorrect data. There have been records of people living 150+ years or less than 0 years. • Do not overlap with another group.

  20. To get full credit for this lab, each group must enter their data into an Excel spreadsheet and email it to me by tomorrow night. • It must be entered in the exact format as on page 46 of your manual. This includes calculating age at death with a formula. This helps you proof for mistakes.

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