National Geographic : 2015 Apr
YELLOWSTONE NATIONAL PARK MT. RUSHMORE NATIONAL MEMORIAL B lack Hi lls Vancouver Missoula San Francisco Custer Custer Seattle Washington, D.C . Ottawa Edmonton Los Alamos BANDELIER NATIONAL MONUMENT Seeley Lake Yankee Fork Salmon River Wolf Creek Pass ALBERTA B.C. NORTHWEST TERRITORIES SASK. MANITOBA ONTARIO YUKON ALASKA (U.S.) ARIZ. CALIF. COLO. IDAHO MONT. NEBR. N. MEX. NEV. OREG. S. DAK. UTAH WASH. WYO. BajaCalifornia CANADA M EXICO UNITED STATE S BorealFores t MARTIN GAMACHE, NGM STAFF; SHELLEY SPERRY SOURCES: CANADIAN FOREST SERVICE; BARBARA BENTZ AND JEANINE PASCHKE, U.S. FOREST SERVICE; AARON MCGILL, ALBERTA ENVIRONMENT AND SUSTAINABLE RESOURCE DEVELOPMENT; TIM EBATA, BRITISH COLUMBIA MFLNRO; ALLAN CARROLL, UNIVERSITY OF BRITISH COLUMBIA; BRIAN AUKEMA, UNIVERSITY OF MINNESOTA Into the Jack Pine The beetles advanced into formerly inhospitable zones, where winter temperatures are no longer reliably cold enough to kill them. They also colonized jack pines, a species found across Canada’s boreal forest. If the beetles can sustain a population there, they could eventually spread east across the country and down into the Midwest and New England. 2007-2013 Few species of pine are immune to the mountain pine beetle. Some scientists fear that winds or infested wood might even spread it to the white, loblolly, and longleaf pines of the Southeast. Southernmost occurrence of lodgepole pine Northern Alberta, where jack and lodgepole pines both thrive, is now the front line in the beetle battle. Alberta’s aggressive cutting and burning of trees may slow the beetle’s eastward spread.