Life tables and survivorship curves provide useful information about the growth

Question

Life tables and survivorship curves provide useful information about the growth or decline of a population. A life table is a set of data that reflects the number of the organism in each age-class in a population. By knowing the number of organisms born in year zero that are still alive at each age, other useful information can be derived which leads ultimately to a way to predict whether a population is growing or declining. This is important information for conservation or control efforts. Complete the empty cells in the following table.

Explanation / Answer

Answer:

The missing value for number dying each year can be calculated by subtracting Number of alive at start of year (1-2year) from Number of alive at start of year (0-1year) = 3698 - 3402 = 296

The missing value for Proportion alive at start of year can be obtained by dividing Number of alive at start of year (2-3year) with Number of alive at start of year (0-1year) = 2921/3698 = 0.789

The missing value for number of offspring per female can be calculated by Multiplying Population alive at start of year (8-9 year) with age specific fertility for same age group (8-9year) = 0.190 * 0.43 = 0.082

Age Class Number of alive at start of year Number dying during year Proportion alive at start of year Age specific fertility Average number of offspring per female 0-1 yr 3698 296 1.000 0.00 0.000 1-2 yr 3402 481 0.920 0.04 0.037 2-3 yr 2921 258 0.789 0.07 0.055 3-4 yr 2663 370 0.720 0.41 0.295 4-5 yr 2293 481 0.620 0.98 0.608 5-6 yr 1812 407 0.490 1.34 0.657 6-7 yr 1405 259 0.380 1.42 0.540 7-8 yr 1146 443 0.310 0.93 0.288 8-9 yr 703 333 0.190 0.43 0.082 9+ yr 370 370 0.100 0.11 0.011

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