Boundaries (orange shading) of a spruce beetle outbreak that began in 1990 in the Kennicott Valley. Note that spruce forest adjacent to the Kennicott Glacier was not affected by the outbreak. This forest, which colonized lateral moraines deposited by Kennicott Glacier during the Little Ice Age, is young and vigorous and resisted beetle attack. The only other significant forest to resist attack was located on areas in the southern portion of the study area that were affected in recent centuries by either anthropogenic fire or stream migration.
Image 12527 is a 2737 by 1475 pixel WebP
Uploaded:
Jul24 08
