A population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02. Using these birth and death rates, calculate an estimate of the total number of individuals added to (or lost from) a population of 1,000 individuals in one year.

40 squirrels are being added to the population per annum

Explanation:

The death rate is 0.02 per capita per annum, and the birth rate is 0.06. If the population size is 1000, the number of deaths per annum = 1000 * 0.02 = 20. The number of births per annum = 1000 * 0.06 = 60. Thus, total 40 numbers of squirrels are being added to the population per annum.