A park has a stable population of birds. Prior to this situation, the birds’ population
increased from an initial low level. When the population of birds was 1000, the
proportionate birth rate was 40% per year and the proportionate death rate was 5% per
year. When the population was 3,000, the proportionate birth rate was 30% and the
proportionate death rate was 10%. Consider the population model under the following
assumptions:
(i) There is no migration and no exploitation.
(ii) The proportionate birth rate is a decreasing linear function of the population.
(iii) The proportionate death rate is an increasing linear function of the population.
Show that
The population grows according to the logistic model.
Find the stable population size.
If the shooting of birds is allowed at the rate of 15% of the population per year, find the
new equilibrium population.
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