Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite

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Author(s)Duren, Kenneth R.
Author(s)Buler, Jeffrey J.
Author(s)Jones, William L.
Author(s)Williams, Christopher K.
Date Accessioned2023-12-08T16:38:05Z
Date Available2023-12-08T16:38:05Z
Publication Date2012-03-23
DescriptionThis article was originally published in Wildlife Society Bulletin. The version of record is available at: https://doi.org/10.1002/wsb.82
AbstractWe assessed the effects of using a broadcast caller during surveys and increasing survey duration to estimate northern bobwhite (Colinus virginianus) density and occupancy. From 15 May 2009 to 15 August 2009, we conducted repeat-visit breeding bobwhite surveys at 180 sites in Delaware, USA. Increasing survey duration from 3 min to 7 min, or using a broadcast caller, improved detection probability for a single visit by 52% and 42%, respectively. However, density estimates when using a broadcast caller were biased high—≥3 times greater compared to passive-listening surveys. Density estimates for 3-min and 7-min passive surveys were not different. Additionally, bobwhite occupancy was similar among all 3 survey treatments. Use of a broadcast caller to survey for bobwhites appears to violate the assumption of distance sampling that an individual is detected prior to movement. Use of a broadcast caller is inappropriate for determining density estimates through distance sampling, but may be appropriate for determining site occupancy. © 2011 The Wildlife Society.
SponsorThis project was funded, in full or part, through a grant from the Delaware Division of Fish and Wildlife with funding from the Division of Federal Aid, United States Fish and Wildlife Service under the State Wildlife Grants Program, as well as additional funding from W. D’Alonzo. We thank E. Irvin and C. Lohr for field support and W. G. Shriver for reviews and advice.
CitationDuren, K.R., Buler, J.J., Jones, W.L. and Williams, C.K. (2012), Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite. Wildlife Society Bulletin, 36: 16-20. https://doi.org/10.1002/wsb.82
ISSN2328-5540
URLhttps://udspace.udel.edu/handle/19716/33676
Languageen_US
PublisherWildlife Society Bulletin
Keywordscall playback
KeywordsColinus virginianus
Keywordsdistance sampling
Keywordsnorthern bobwhite
Keywordsoccupancy
Keywordslife on land
TitleEffects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite
TypeArticle
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