Whitebark pine (Pinus albicaulis) is an obligate mutualist of Clark's nutcrackers (Nucifraga columbiana) because its seedlings sprout almost exclusively from Clark's nutcracker seed caches. Currently, whitebark pine is rapidly disappearing range-wide, and as of 2015, 51% and 64% of the remaining live whitebark pines were infected by blister rust in North Cascades and Mt. Rainier National Parks, respectively. This high mortality may seriously reduce biodiversity and disrupt many species interactions.
Recent surveys suggest Clark’s nutcrackers are also declining in Washington’s national parks. Due to continuing decline of these species, it is essential to ascertain whether standard whitebark pine management techniques, such as planting and thinning, are adequate, or if there needs to be an increased focus on management of Clark’s nutcrackers, and/or of a mosaic of ecosystems surrounding whitebark pine habitat. A downward trend in Clark’s nutcracker populations would have reciprocal effects for whitebark pine population regeneration, and consequently for the viability of subalpine ecosystems in the western U.S. To sustain whitebark pine communities and subalpine ecosystems, Clark’s nutcracker populations must be maintained. This requires information on landscape scale space use in Clark’s nutcrackers.