Visibility bias of waterfowl brood surveys using helicopters in the Great Clay Belt of northern Ontario / T. Shane Gabor, Ted R. Gadawski, R. Kenyon Ross, Robert S. Rempel, and Darryl W. Kroeker.
Material type:
TextSeries: Journal of Field Ornithology. 66(1) 81-87 Publication details: 1995.Description: 28 cmLOC classification: - GAB
| Item type | Current library | Collection | Call number | Status | Date due | Barcode |
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Electronic Journal
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IWWR Supported Research | Non-fiction | GAB (Browse shelf(Opens below)) | Available | 16827 |
Includes bibliographic references (page 87).
Replicate helicopter surveys were employed to examine the efficiency of helicopter-
based waterfowl brood surveys in the Great Clay Belt region of northern Ontario during
1990. Waterfowl broods were resighted more often on lake-estuary and lake-shore marshes
than on other boreal forest wetland types. Low brood resighting (<40%) on most boreal
forest wetland types indicate that a considerable number of broods are missed during helicopter
surveys. Differences in resightability were not detected between divers and dabblers.
The visibility correcton factor for broods on all wetlands combined was 2.09. Helicopter
surveys in the boreal forest should be accompanied by a replicate survey to improve the
precision of the waterfowl brood density estimate and establish a visibility correction factor.