Breeding Range Expansion of Bell's Vireo in Grand Canyon, Arizona
Brown BT, Carothers SW, Johnson RR. 1983. Breeding Range Expansion of Bell's Vireo in Grand Canyon, Arizona. The Condor. 85(4):499-500
Since the late 1960's, Bell's Vireo (_Vireo bellii_) has expanded its Arizona breeding range along the Colorado River from the area of upper Lake Mead and the Hualapai Indian Reservation eastward into Grand Canyon National Park. The associated increase in numbers is of special interest because populations of Bell's Vireo have diminished or disappeared in other areas of the southwestern United States. The expansion of breeding range coincides with the construction of Glen Canyon Dam on the Colorado River, which subsequently created an estimated 200-500 ha of riparian woodland and suitable vireo habitat. Observations indicate a breeding range expansion of at least 219 km in the 30 years between 1953 and 1982, in addition to a significant increase in numbers of singing males..
- Type
- Journal Article
- Authors
- Brown, Bryan; Carothers, Steven; Johnson, R.
- Units
- GRCA , SODN
- Keywords
- Bell's Vireo, Ornithology (Migration Dispersal Behavior)