| Autor: |
Kubisiak, John F., Paisley, R. Neal, Wright, Robert G. |
| Zdroj: |
Canadian Field-Naturalist; Jul/Sep1997, Vol. 111 Issue 3, p417, 0p |
| Abstrakt: |
Forty-three flocks of Eastern Wild Turkeys (Meleagris gallopavo silvestris), 26 of which contained >/= 1 bird with a functional radio, were used to compare the number of flocks and number of birds counted in winter by aerial observation with known numbers on the ground. Research was conducted in an experimental turkey hunting zone (THZ) whereTurkeys were intensively monitored as part of a population dynamics study. Helicopter-based counts (H) of total flock, and total birds averaged 86% and 80%, respectively, of ground-based (G) counts in the THZ where H/G comparisons were made in 1989, 1991, and 1993. Turkey densities adjusted by the 0.80 H/G ratio based on the total number of birds counted by helicopter- and ground-based observers in the experimental THZ, varied from 0.9 to 11.0/km2 during 12 helicopter counts in 5 THZs during 1989--1994. Turkey densities were correlated (P = 0.025) with the spring harvest density derived from the numberof gobblers killed/km2 of forest from mandatory registration. Helicopter surveys of Wild Turkeys are most applicable in areas dominated by deciduous woodlands and agricultural crop fields where snow depths >/= 15 cm occur. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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