Differences in the distribution of adult and immature bald eagles at an autumn concentration in Montana
Bennetts RE and Mcclelland BR. 1991. Differences in the distribution of adult and immature bald eagles at an autumn concentration in Montana. Northwest Science. 65(5):223-230
A comparison of the abundance of adult and immature bald eagles was performed in the autumns of 1983 and 1984, at two foraging sites along Lower McDonald Creek in Glacier National Park, Montana. During the autumns of 1983 and 1984 we compared the relative abundance of adult and immature Bald Eagles (Haliaeetus leucocephalus) at two foraging sites along Lower McDonald Creek in Glacier National Park, Montana. The ratio of adults to immatures differed between the locations. We examined four hypotheses related to migration that could account for these differences: timing, human disturbance, behavioral exclusion, and food availability. Our results suggest that food availability was the primary factor influencing the distribution of adult and immature eagles during this study.
- Type
- Journal Article
- Authors
- Bennetts, Robert; Mcclelland, B
- Units
- GLAC
- Keywords
- Age Distribution, Animal Studies, Bald Eagle (Haliaeetus leucocephalus), Fall (Season), Food Availability, Impacts, Lower McDonald Creek Glacier National Park MT