Sitting atop the highest slopes in western North America, the whitebark pine has adapted to the continent’s harshest growing conditions. Temperatures in the sub-alpine zone where it thrives are often well below zero, snow is measured in feet, and winds often exceed 100 miles an hour. These stout, twisted trees are survivors: The oldest have grown for nearly 13 centuries.
But change has come to this high-elevation redoubt, threatening not only the whitebark pine’s survival but that of a host of creatures — from birds to bears — that rely on this keystone species. Warmer temperatures, a fungal disease called white pine blister rust, and swarms of mountain pine beetles have killed hundreds of millions of whitebark pines across the West. Wildfires are taking an increasing toll, and other conifer species are moving upslope in the…
Read the full article originally published at e360.yale.edu.