Clark's nutcracker is the primary seed disperser for whitebark pine (Pinus albicaulis). Whitebark pine is in decline throughout its range, due to infection by white pine blister rust (Cronartium ribicola), widespread outbreaks of mountain pine beetle, and the long-term effects of fire suppression. The Clark's nutcracker is an integral part of the whitebark pine restoration process: the Clark's nutcracker must remain in whitebark pine forests and cache the seeds in excess, so that healthy trees will continue to grow. If whitebark pine declines into extinction, the Clark's nutcracker will lose an important source of food and may no longer be seen in areas where the tree is the primary source of seed, such as Glacier National Park.