Question

Your supervisor makes you remove all of the artificial nesting sites because they are preventing people from rafting on the river. So you decide to save the population of pike minnows by destroying trout nesting sites instead. Assume that 500 natural nesting sites exist for pike minnow and 500 exist for trout. At what number of trout sites will the pike minnow population start to grow? Assume that competition coefficients and per capita growth rates are the same as in question 2.
450
400
350
300
250

The picture/problem below is question #2..as it refers to in the end of the above question

As part of your Fish &Wildlife job, you measure some populations and find the following: the competitive effect of trout on pike minnows equals 1.25, the competitive effect of pike minnows on trout equals 0, the per capita growth rate of pike minnows equals 0.25, and the per capita growth rate of trout equals 0.5. The carrying capacity of a species equals the number of available nesting sites. Currently, the environment contains 500 nesting sites. You devise a way to introduce artificial nesting, which only pike minnows can use. If you introduce these artificial nesting sites (leaving the trout nesting sites at 500), how many would you need for the pike minnow's population to grow? 600 700 800 900 1000

Answer 1

From the information, observe that as part of the person's Fish & Wildlife job, person measure some populations and following tasks. The competitive effect of trout on pike minnows equals 1.25 The competitive effect of pike minnows on trout equals 0 The per capita growth rate of pike minnows equals 0.25 The per capita growth rate of trout equals 0.5 The carrying capacity of a species equals the number of available nesting sites. The number of nesting sites is 500. Calculate the number of needed sites for the pike minnow's population to grow is, Expected number = (1.25 x 500)+(0x500) +(0.25 x 500)+(0.5x500) = 625 +0+125+ 250 = 1000 Hence, the correct option is (E).

Answer 2

3. Your supervisor makes you remove all of the artificial nesting sites because they are preventing people from rafting on the river. So you decide to save the population of pike minnows by destroying trout nesting sites instead. Assume that 500 natural nesting sites exist for pike minnow and 500 exist for trout. At what number of trout sites will the pike minnow population start to grow? Assume that competition coefficients and per capita growth rates are the same as in question 2.

a) 450

b) 400

c) 350

d) 300

e) 250