Expansion of canopy-forming willows over the twentieth century on Herschel Island, Yukon Territory, Canada.

Isla Myers-Smith, David Hik, Catherine Kennedy, Dorothy Cooley, Jill Johnstone, Alice Kenney, Charles KREBS

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Canopy-forming shrubs are reported to be increasing at sites around the circumpolar Arctic. Our results indicate expansion in canopy cover and height of willows on Herschel Island located at 70 degrees north on the western Arctic coast of the Yukon Territory. We examined historic photographs, repeated vegetation surveys, and conducted monitoring of long-term plots and found evidence of increases of each of the dominant canopy-forming willow species (Salix richardsonii, Salix glauca and Salix pulchra), during the twentieth century. A simple model of patch initiation indicates that the majority of willow patches for each of these species became established between 1910 and 1960, with stem ages and maximum growth rates indicating that some patches could have established as late as the 1980s. Collectively, these results suggest that willow species are increasing in canopy cover and height on Herschel Island. We did not find evidence that expansion of willow patches is currently limited by herbivory, disease, or growing conditions.
Original languageEnglish
Pages (from-to)610-623
Number of pages14
JournalAmbio
Volume40
Issue number6
DOIs
Publication statusPublished - 2011
Externally publishedYes

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