Wild turkey (<Emphasis Type="Italic">Meleagris gallopavo</Emphasis>) detectability from helicopters and ramifications for estimating abundance |
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Authors: | Matthew J Butler Warren B Ballard Mark C Wallace Stephen J DeMaso |
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Institution: | (1) Department of Natural Resources Management, Texas Tech University, P.O. Box 42125, Lubbock, TX 79409-2125, USA;(2) Texas Parks and Wildlife Department, 4200 Smith School Road, Austin, TX 78744, USA |
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Abstract: | Aerial surveys have been used to estimate abundance for several wild bird species but its application for wild turkey (Meleagris gallopavo) populations has been limited. We surveyed Rio Grande wild turkey (M. gallopavo intermedia) populations during March 2006 using an R44 helicopter. We used flocks with radio-tagged birds to estimate flock detectability.
We also used simulations to evaluate accuracy and precision and examine power to detect trends in population change. We observed
that wild turkey flock detectability was 94.7% (74.0–99.9%; 95% CI). Our simulations suggested helicopter surveys would underestimate
abundance by about 5.6% (4.6% CV). Surveying 980 to 1,960 km2 (requiring 27 to 55 h of flight time) can provide sufficient power (≥0.80) to detect a 10 to 25% change in abundance over
a 4- to 5-year period. |
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Keywords: | Abundance Aerial Detectability Population trend Simulation |
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