Geography 2152F/G Chapter Notes - Chapter 5: Creatures 2, Silt
4 Dec 2018
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Reading #5 review questions: how has the elimination of some forest fires contributed to the mountain pine beetle problem in british columbia, elimination of forest fires turns the woods into beetle buffets. Warmer weather also has boosted the beetles population greatly expanded their range. They are flourishing farther north and at higher elevations: in the past, the relationship between beetles and the forest was considered mutually beneficial. Explain how that has changed in recent years: mutually beneficial pine beetles culled older, weaker trees producing new beetles but also a healthier forest. Over the years, climate change, with its warmer, drier conditions has upset that balance leaving even healthy trees vulnerable to attack. She will chew through the barkand sever the ducts that contain resin trees first line of defense. The beetle has evolved to ingest the resin. She can then convert it in to a pheromone, a chemical that sends message to other beetles.
