Life Table




BIO326 : Population : Population Characteristics : Life Table

Exercise: Life Table

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DUE: 11-Feb-2000. Work sent after this date will receive a grade of zero.

A life table is a model of changes in population density. It focuses on essential aspects of the birth and death processes while eliminating the minor and confusing details.

Suppose a population exhibits the following life table at time, 0:
   Age
(x)   Survival
(s_x)   Fecundity
(b_x) Number of
  Individuals
(n_x)

0 0.6 0 10

1 0.5 1 10

2 0.3 2 10

3 0.0 3 10

Age (x)	Survival (s_x)	Fecundity (b_x)	Number of Individuals (n_x)
0	0.6	0	10
1	0.5	1	10
2	0.3	2	10
3	0.0	3	10

1. Project this population into the future (time intervals 0-8) as in Table 15.2, pg 331, showing the age structure at each time interval, total population density, and lambda. Note: If you use a calculator to do your calculations, keep at least 2 places after the decimal until all calculations are complete. Give your answers for individuals with one place after the decimal. Give two places after the decimal for lambda.

2. What is the stable age distribution of this population? Give one place after the decimal.

3. How many time intervals (i.e., generations) did it take for lambda to become constant? Why wasn't lambda constant in the first several time intervals?

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