Bird Decline Data for California Mixed Conifer Forest Old Growth Dependent Species

Courtesy of :

Sauer, J. R., J. E. Hines, G. Gough, I. Thomas, and B. G. Peterjohn. 1997.

The North American Breeding Bird Survey Results and Analysis. Version 96.3.

Patuxent Wildlife Research Center, Laurel, MD

The following eleven species of birds are documented breeders in the Black Mountain Scenic Area of the San Jacinto Mountains, and depend upon old growth forests and associated habitats. The National Breeding Bird Atlas Database was consulted to plot the thirty year trend of decline in the populations of these species. Logging of snags and old growth trees disrupts their breeding and eliminates critical nesting and feeding habitat, a contributing factor behind these documented declines.

The data has been compiled through the National Breeding Bird Atlas projects, and represents documented nests observed by species within an established spatial grid of observations per year.