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Politics : Evolution
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To: Solon who wrote (51389)4/22/2014 3:05:22 AM
From: 2MAR$  Read Replies (1) of 69300
 
The threat of the mountain pine beetle, Canada’s boreal forest
nrcan.gc.ca

Spreading up farther north than seen, this insect kills more trees than all the forest fires every year
combined, now migrating east and attacking other pines.

What could influence the beetle’s continued spread?Scientists expect the beetle to continue expanding its geographic range, moving into the boreal forest and Canada’s northern and eastern pine forests. Several factors will determine the extent to which this spread occurs:


Annual displacement vectors
Larger image [247 kb GIF]

  • Dispersal ability – As a normal feature of their life history, adult beetles fly to new trees and colonize. The possibility of long-distance dispersal (greater than 100 km) under favourable weather conditions is well documented.
  • Climatic suitability for infestation – Milder winters and warmer summers contribute to both higher recruitment and survival rates of the MPB.
  • Susceptibility of boreal pine stands to infestation – Pine stands in the boreal forest are typically less dense and have smaller trees than British Columbia’s lodgepole pine forests. Such stand characteristics may not necessarily be optimal for beetle spread, but new evidence suggests they may be less of an impediment to the spread and establishment of the beetle in boreal stands than previously believed.
  • Effectiveness of forest pest management efforts – Control efforts now underway are reducing MPB populations and helping to slow their spread, but the area of forest being attacked by the beetle continues to increase.


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