Differential migration of Blue Grouse in Colorado
The Auk
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Abstract
We examined migration of adult Blue Grouse (Dendragapus obscurus) in north-central Colorado by radio tracking 13 males and 19 females. Elevational changes associated with movements to winter areas were greater for males (median = 488 m, range = 183-671 m) than females (median = 122 m, range = -61-760 m). Males (median = 10.5 km, range = 1.0-29.4 km) also moved farther than females (median = 1.0 km, range = 0.1-28.0 km), resulting in partial segregation of sexes during winter. Directional orientation of movements to wintering areas was nonrandom for long-distance (>3 km) migrants. Median elevational change (122 m) and distance (0.6 km) between the first-winter and first-breeding areas for seven juvenile females were similar to movements of adult females. Males (median = 7 July) departed breeding areas earlier than females (median = 11 August), but arrived (median = 14 October) on winter areas about the same time as females (median = 23 October). Both sexes exhibited fidelity to winter areas. The average distance between winter locations ranged from 94 to 312 m (median = 135 m) for 11 radio-marked adults, suggesting Blue Grouse were sedentary on their winter ranges.
Suggested Citation
Cade, B.S., Hoffman, R.W., 1993, Differential migration of Blue Grouse in Colorado: The Auk, v. 110, no. 1, p. 70-77.
ISSN: 1938-4254 (online)
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Differential migration of Blue Grouse in Colorado |
| Series title | The Auk |
| Volume | 110 |
| Issue | 1 |
| Year Published | 1993 |
| Language | English |
| Publisher | American Ornithological Society |
| Description | 8 p. |
| First page | 70 |
| Last page | 77 |