Geography 2152F/G Study Guide - Final Guide: Silt, Jemez Mountains, Jack Pine
25 Apr 2017
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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. 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: 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: describe how female beetles have evolved to survive the natural defenses that the trees produce.
