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? Is the life span of people who were buried in newer cemeteries greater than those who were buried in older
cemeteries? 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
Type I (convex) Type I Survivorship 5.00 4.00 log # survivors Many mammals show this type of survivorship. Most individuals
will live a long time and die in the largest age groups. 3.00 2.00 1.00 0.00 Time
Type II (straight/linear) Type II Survivorship log # survivors 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. Age intervals Type III (concave) Type III Survivorship 4.80
4.60 log # survivors Many invertebrates and marine fish show this type of survivorship. Most individuals die as juveniles.
4.40 4.20 4.00 3.80 3.60 Time Which do we predict to find? Type III Survivorship 4.80
4.00 4.60 log # survivors 5.00 3.00 2.00
1.00 0.00 4.40 4.20 4.00 3.80 3.60 Time
Time Type II Survivorship log # survivors log # survivors Type I Survivorship
t 25 t 20 t 15 0
o3 5 o2 0 o2 0
5 o1 o1 o5 t 10
5t 0t Age intervals Why might men live longer than women? Risks associated with childbirth
Why might women live longer than men? Risky behavior Smoking Homicide and suicide
Alcohol War Toxic effects of testosterone Why has human life expectancy increased over the last several decades?
Improvements in medicine, nutrition, and sanitation 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. 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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