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spruce expansion photo pair
Photo Credits: Leslie A. Viereck (1958), Leslie A. Viereck (2001)
Ecoregion: Alaska Range Mountains
Change Type: Changing treelines
Changing treelinesAnimation is available
Description:
An increase in spruce is apparent on this portion of the Denali landscape near the Teklanika River. If one was so inclined, he or she could actually count the number of spruce visible in this photo pair and create an estimate of spruce density at this site. Although a valid method, the National Park Service has chosen to do a different and more thorough type of vegetation monitoring that is capable of tracking many types of vegetation changes. See science.nature.nps.gov for more information.