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- Title
Relation of Topography and Vegetation to the Occurrence of Douglas-Fir Dwarf Mistletoe at Its Northern Limits in British Columbia.
- Authors
Smith, R. B.
- Abstract
The northernmost occurrence of Douglas-fir dwarf mistletoe (Arceuthobium douglasii Engelm.) is near Sicamous, British Columbia. Its presence in the Interior Western Hemlock Zone, characterized by a higher summer precipitation than the parasite's usual habitat is partially explained by an ecological survey of infected and neighboring uninfected stands. The parasite is concentrated on a steep, southwest-facing slope which possesses many of the same floristic features as the drier Interior Douglas-fir Zone, including the tendency for perpetuation of almost pure Douglas-fir stands. In contrast, the adjacent northwest-facing slope, which supports vegetation characteristic of the Western Hemlock Zone, is free of A. douglassi. Because of the restriction of A. douglassi to a single host in this area, and its relatively slow rate of spread, the extension of the parasite into areas within the Western Hemlock Zone would undoubtedly be checked except in edaphically dry situations or where continuous disturbances such as logging favor the host tree, Douglas-fir.
- Publication
Ecology, 1972, Vol 53, Issue 4, p729
- ISSN
0012-9658
- Publication type
Article
- DOI
10.2307/1934792