Question

1. A population of native beetles with 3,000 individuals has a carrying capacity of 7,500, and a per capita rate of increase of 0.03 per week. Suppose 2,000 individuals of an invasive species are added to the community and that this species has a competitive coefficient of 1.3 on the native species. What is the population growth rate of the native beetle under these conditions?  

a. 90.6 per week

b. 71.3 per week

c. 22.8 per week

1.3 per week

2. Suppose the competition coefficient describing the competitive effect of elephants on giraffes is 3. This means that adding 7 elephants to the community would decreases the giraffe population growth rate by the same amount as the adding __________________ giraffes.

a. 10

b. 4

c. 2.3

d. 21

Answer 1

Here given population of natine beetles = 3000; having carrying capacity = 7500, per capitata rate of increase = 0.03 per per weer Invasive Species population - 2000. have competitive coefficient = 1.3 Population growth rate of beetles (native) = 0.03 x 3000 x(1-73)x1000 x 3, GR = 022:08 per week 1000 .: € 22.8 per wee e elephant to giraffe competitive - coeff of 3. - For 7 elephant Ewe have growth rates + 2 = 2.3. 2.3