This species was not detected on surveys elsewhere in the park. Blackpoll warblers have concerned scientists because population declines have been documented elsewhere and because this species selects a narrow range of habitats. Monitoring of landbirds in the park will be continued in 1999. Surveys on off-road routes in shrub, alpine tundra, and mixed riparian habitats may be added. Askins, R.A., J.F. Lynch, and R. Greenberg.
Population declines in migratory birds in eastern North America.
Rappole, J.H., and M.V. McDonald. Cause and effect in population declines of migratory birds.