Response Statement - Pitcher's Thistle
This globally vulnerable endemic thistle of the Great Lakes occupies a small area including a series of sandy shoreline habitats from southeastern Lake Huron to Pukaskwa National Park on the north shore of Lake Superior. The species’ core range in Canada occurs along the southern margin of Manitoulin Island and nearby islands. Increases in population size and number have occurred over the past decade due to increased surveys. This species is at continued but reduced risk because of its specialized life history of flowering and reproducing only once at age 3-11 years before dying, its mainly small populations that undergo fluctuation, and ongoing habitat impacts from a variety of causes. Such threats as recreational ATV use in the species’ habitat, presence of an exotic grass (Common Reed) and spread of woody plants into its habitat affect various populations.
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- "Response Statement - Pitcher's Thistle" (2011-12-08) (PDF format, 3.58 KB)
Canadian Wildlife Service
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