It grows on soils derived from glacial till, sometimes in mats of " Selaginella ", such as whitebark pine ( " Pinus albicaulis " ).
42.
Between 1930 and 1970, efforts to control the spread of blister rust were unsuccessful, and continued destruction of whitebark pines appears likely, with attendant negative impacts on dependent species.
43.
Upper montane and subalpine forests are made up of red fir, mountain hemlock, western white pine, lodgepole pine; and at the highest elevations, foxtail and whitebark pines.
44.
In the sub-alpine zone of the mountains spruce and fir predominate, and they are succeeded near the timber line by larch, whitebark pine, limber pine and bristlecone pine.
45.
This fungal disease was accidentally introduced from Europe into North America, where it has caused severe mortality in the American native white pines in many areas, notably the closely related whitebark pine.
46.
Engelmann spruce, mountain hemlock, subalpine fir and whitebark pine can be found in the higher elevations, with Douglas-fir, white fir, western larch, and lodgepole pine elsewhere.
47.
Whitebark pine forest may be replaced with Douglas fir, and on the lower slopes, forest would give way to treeless landscapes dominated by big sagebrush, Idaho fescue, and bluebunch wheatgrass.
48.
Due to various changes in the ecosystem, some of them human-induced, efforts have been made to provide enhanced protection to some species of native fish and the increasingly threatened whitebark pine.
49.
The Sierra Nevada are home to half of the vascular plant species of California, with 400 species that are subalpine forest dominated by whitebark pine, up to alpine tundra which cannot support trees.
50.
Common species of the white pine forests include whitebark pine in the northern Rocky Mountains, limber pine in the central and north-central Rocky Mountains, and bristlecone pine in the southern Rocky Mountains.
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