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The trees spanning many of the mountainsides of western Montana glow an earthy red, like a broadleaf forest at the beginning of autumn.
But these trees are not supposed to turn red. They are evergreens, falling victim to beetles that used to be controlled in part by bitterly cold winters. As the climate warms, scientists say, that control is no longer happening.
Across millions of acres, the pines of the northern and central Rockies are dying, just one among many types of forests that are showing signs of distress these days.
The devastation extends worldwide. The great euphorbia trees of southern Africa are succumbing to heat and water stress. So are the Atlas cedars of northern Algeria. Fires fed by hot, dry weather are killing enormous stretches of Siberian forest. Eucalyptus trees are succumbing on a large scale to a heat blast in Australia, and the Amazon recently suffered two “once a century” droughts just five years apart, killing many large trees.
Experts are scrambling to understand the situation, and to predict how serious it may become.
Scientists say the future habitability of the Earth might well depend on the answer.
See, Interactive Map
Originally posted by Doublemint
time for evolution to take place. alsothe trees in the northen rocky were only dieing because of warmer weather as one of mutiple reasons. A few questions has this ever happend before? How much has the temp. changed ever since this has been noticed? How far north do these beatles need to migrate north before it becomes to cold for them?
Bark beetles (Coleoptera: Scolytidae) attack trees by boring through the bark and tunneling in the phloem and cambium layers surrounding the sapwood. Conifers such as pines and spruce usually produce copius amounts of resin to defend against the penetration by bark beetles (Raffa and Berryman, 1987). These resins have long been known to contain monoterpenes with toxic properties as well as being viscous and sticky. causing entrapment and suffocation of beetles (Webb,1906; Smith, 1961, 1965; Hodges et al., 1979; Raffa and Berryman, 1982, 1987; Byers, 1989; Werner, 1995; Klepzig et al., 1996). Therefore, it could be expected that bark beetles have evolved olfactory mechanisms and behaviors for the avoidance of specific volatile monoterpenes in tree resins. Pitman et al. (1966) reported that gas chromatographic effluents of frass from male, pine bark beetles, Ips paraconfusus Lanier, containing the monoterpenes alpha-pinene, myrcene, (B-pinene, 3-carene, and limonene, elicited "strong negative klinotactic movements" by walking beetles. However, most other earlier studies found that certain monoterpenes enhance the attraction to pheromone components in some of the most "aggressive" bark beetles that kill living trees (Bedard et al., 1969; Werner, 1972; Rudinsky et al.. 1972).
Originally posted by Afterthought
Edit to Add: I just saw your comment saying that this thread isn't supposed to be about causes, but I don't see how this can be avoided if we are going to increase our awareness.
Originally posted by mnmcandiez
LOL so humans are to blame for beetles killing trees? Get real......
LETS ALL PANIC AND NEVER BE ALLOWED TO USE ELECTRICITY OR HOT WATER
Eco- Nazis are scary