Life tables and survivorship curves provide useful informati

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.

Solution

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