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Final

Geography 2152F/G Final: Reading Questions
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Department
Geography
Course
Geography 2152F/G
Professor
Mark Moscicki
Semester
Winter

Description
GEOG 2152: Geography of Hazards Reading #5 Review Questions 1. How has the elimination of some forest fires contributed to the mountain pine beetle problem in British Columbia? British Columbia’s forests were packed with three times as many mature pines as there would have been had they been allowed to burn naturally. It turned the woods into beetle buffets. 2. What is the reason that some scientists believe that the beetle could potentially spread all the way to the Atlantic provinces of Canada? Because the beetle is already in jack pines, and jack pines live as far east as Nova Scotia and down into the upper Midwest and New England. 3. In the past, the relationship between beetles and the forest was considered mutually beneficial. Explain how that has changed in recent years. The human activities warmed the whole planet with our carbon dioxide emissions. Rising temperatures and drought have stressed tress, leaving them unable to fight an invasion. The trees like jack pine and whitebark are not as good at defending themselves, a small band of beetles can overwhelm them. Warmer weather also had boosted the beetle’s population and greatly expanded their range to farther north and at higher elevations. 4. Describe how female beetles have evolved to survive the natural defenses that the trees produce. When a female mountain pine beetle lands on a tree, she first decides whether it is a decent place to raise a family. To do this, she will chew into the bark and taste the chemicals. If the tree meets her standards, she will continue burrowing, cutting 切断 ducts 输送管 that contain re
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