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Relate what you know about the effects of fire on ecosystems and the debate about putting out fires in Yellowstone National Park.

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Bunny Greenfelder
Bunny GreenfelderLv2
28 Sep 2019

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Related questions

This part of the activity focuses on the practice of setting aside natural areas for ecological, cultural, and recreational purposes. In some wilderness areas, human use of the area is kept to an absolute minimum. But, it can be expensive and difficult to maintain wild areas with little human influence. The areas are so beautiful that they attract many visitors, who in turn can harm the natural attraction itself. Vehicles can be a particularly difficult problem in natural areas such as this. Yellowstone Park was established in 1872 and has more than 2.2 million acres. It remains one of the most popular units of the U.S. National Park system and has more than 3 million visitors each year. Instructions Review the Case Study at the beginning of Chapter 12, entitled “Protecting Forests to Prevent Climate Change,” and Section 12.3, entitled “Parks and Preserves.” Consider reasons it is important to maintain forest ecosystems. Open Google Earth, and in the search box enter Old Faithful, Yellowstone National Park, WY. Click Search. According to the textbook, how and why did Stephen Mather, the first U.S. National Park Service director, encourage tourist use of the parks? What were some positive and negative results?

What pressures led to the exclusion of grey wolves from the ecosystem? Can you think of other keystone species (excluding those in question 2 above) in Canada or North America that have undergone a similar fate? What are the ecosystem responses with the exclusion of these keystone species? (15 marks)

Using the examples of Yellowstone National Park, describe how Society can develop successful strategies to promote the inclusion of top predators while minimizing conflict with humans. (10 marks)

Question 3 (8 points)

Brown fur stripes (autosomal recessive) is found in 13% of thesquirrels in Yellowstone National Park. Black is the dominantstripe color. Answer the following questions about this population,assuming this population of squirrels is in Hardy-Weinbergequilibrium with respect to fur stripes.

What are the frequencies of the brown stripe (b) and blackstripe (B) alleles?


b) What is thefrequency of heterozygotes?


c) In the nextgeneration, what is the proportion of heterozygote matings?(Hint: You will need to use the product rule.)

d) In the next generation, what proportion ofsquirrels will be brown stripe progeny resulting from heterozygotematings? (Hint: You will need to use the productrule.)

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