Geography 2152F/G Lecture Notes - Lecture 14: Silt
11 Apr 2019
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Reading #5 review questions: how has the elimination of some forest fires contributed to the mountain pine beetle problem in. The elimination of some forest fires in bc turned the woods into beetle buffets. Rising temperatures and drought have stressed trees leaving them unable to fight an invasion. Warmer weather also boosted the beetles" population and expanded their range. The risk of invasion of jack pines in the boreal forest across canada was significant because the beetle is already in the jack pines: in the past, the relationship between beetles and the forest was considered mutually beneficial. Explain how that has changed in recent years. The relationship was mutually beneficial pine beetles culled older, weaker trees, producing new beetles but also a healthier forest. Climate change, with its warmer, drier conditions, has upset that balance, leaving even health trees vulnerable to attack: describe how female beetles have evolved to survive the natural defenses that the trees produce.
