Question

1.If a population has a birth rate of 0.07 and a death rate of 0.01, calculate the number of individuals added/subtracted from a population of 1,000 individuals in one year. 2.In a mark-recapture experiment, scientists tagged 300 birds in one month. Several months later, they returned and captured 500 birds. 75 of those birds had a tag on them. What is the size of the entire population

Answer 1

1. The number of individuals added/subtracted from a population of 1,000 individuals in one year = 70/10 respectively (60 net).

2. The size of the entire population of birds = 2,000.

Step-by-step explanation:

1. Population = 1,000

Birth rate = 0.07

Death rate = 0.01

Population Growth Rate = Birth rate + Net migration - Death Rate

= 0.07 = 0.01

= 0.06

The number of individuals added to the population = 70 (1,000 * 0.07)

The number of individuals subtracted from the population = 10 (1,000 * 0.01)

Therefore, the overall number added = 60 (70 - 10) or (1,000 * 0.06)

2. Number of birds tagged in one month = 300

Number of birds captured after several months later = 500 birds

Number of birds captured with a tag on them = 75

The proportion of tagged birds out of the captured = 75/500 = 0.15

The size of the entire population of birds = Number of birds tagged/Proportion of captured birds with a tag

= 300/0.15

= 2,000