Given a current hawk population of 4O adults, 1O sub-adults, and O juveniles and

Question

Given a current hawk population of 4O adults, 1O sub-adults, and O juvenilesand the following rules, calculate the total hawk population 1 year from now.

Rules

I. Only adults can reproduce

II. Hawks reproduce once per year [current population has already reproduced for this year]

III. Hawks are juveniles and sub-adults for 1 year only

IV. Use life cycle below as guide:

-Eggs/juveniles---->sub-adults----->adults

Juvenile survival Rate = .25

Sub-adult Survival Rate = .83

Adult SR = .92

Adult Fecundity= .5O

Explanation / Answer

In the above mentioned date, Adult fecundity rate = 0.5 of 40 adults.

Thus 20 new juveniles are born.

Juvenile survival rate is 0.25.

That means out of 20, 5 juveniles survive.

So, 5 juveniles are added to the population.

10 subadults were already existing. They have a survival rate of 0.83.

This means out of 10 only 8 sub- adults survive.

40 adults were existing. They have a survival rate of 0.92.

This means 37 adults will survive.

Thus the new population after a year will have a total of 37+8+5 = 50 hawks.

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