Competitive Exclusion
Instructions: Use the competition model (contained in “competition model.xls”) to evaluate the scenarios of competition between the Colorado pike minnow and rainbow. For each scenario, use
the Excel sheet to enter the values for K, r , and the competition coefficient ( α or β) for each population..
As per usual, you will need to work through this assignment in order to successfully answer the day’s clicker questions.
Abbreviations:
Species/population 1 = pike minnow
Species/population 2 = rainbow trout
α = effect of species 2 on species 1
β = effect of species 1 on species 2
1. You work for the US Fish and Wildlife Service, which wants to maintain populations of endangered fish in the Colorado River. As a wildlife manager, you know that the population of pike minnow is threatened by non-native trout. How might you increase pike minnow populations? Brainstorm two potential ideas, and explain how each plan targets r, K, α, or β.
One idea would to find something that reduces the nests of only the trout, reducing their numbers
without affecting the amount of trout minnow or creating a way to increase the nests of the trout minnow. Another idea would be to find some way of trapping them, or creating some sort of barrier between the fish populations to help each of them thrive separately.
2. 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 will you need for the pike minnow’s population to grow?
a) 600
b) 700
c) 800
d) 900This study source was downloaded by 100000827506713 from CourseHero.com on 09-01-2021 03:21:50 GMT -05:00
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