We think of vegetation as stationary and remaining pretty constant. Usually that is true, but  when you look closer, especially over long periods, you see how vegetation changes. This article summarizes some of the major changes  we are seeing in Alaska's vegetation communities. 
"A survey of the recent #ecological literature reveals that #Alaska’s vegetation is already responding in myriad ways to our changing #climate  with profound consequences for resident biota. There is copious evidence for both process-related and structural changes being manifested with important and lasting implications for both humans and Alaska’s #ecosystems."  https://www.nps.gov/articles/000/aps-22-1-3.htm 

 "Warming has been shown to be a driver of shrinking surface area of wetlands Alaska is becoming a much woodier place as lakes and ponds are encroached upon or replaced by shrubs and trees.
One thing is certain, however, the vegetation changes instigated by a warming and changing climate will exert consequential and far-reaching influences on most of Alaska’s biota including invertebrates, birds, mammals, and humans, among others. This is because plants form the energetic foundations of terrestrial ecosystems (they are the primary base of all food webs) and define the primary structural elements of habitat for most animal species."

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