Yellow-cedar decline was first observed in the late 1800’s, and it accelerated in the latter part of the 20th century. Lauren E. Oakes, a Ph.D. candidate in the Emmett Interdisciplinary Program in Environment and Resources at Stanford University, is studying the ecological repercussions of the dieback of yellow-cedar forests in the Alexander Archipelago in southeastern Alaska. According to Lauren Oakes: "Forest diebacks related to climate change are occurring on all six plant-covered continents. What we see in southeastern Alaska is not an anomaly, but part of a global pattern that has been unfolding for several decades."
http://green.blogs.nytimes.com/2012/06/13/in-the-wild-seeking-an-answer-what-replaces-dying-trees/?hp
Above left: a canopy view of live yellow-cedar forest in Glacier Bay National Park
Above right: yellow-cedar decline in Slocum Arm in the West Chichagof-Yakobi Wilderness
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