Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite
Abstract We 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....
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| Format: | Article |
| Language: | English |
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Wiley
2012-03-01
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| Series: | Wildlife Society Bulletin |
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| Online Access: | https://doi.org/10.1002/wsb.82 |
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| author | Kenneth R. Duren Jeffrey J. Buler William L. Jones Christopher K. Williams |
| author_facet | Kenneth R. Duren Jeffrey J. Buler William L. Jones Christopher K. Williams |
| author_sort | Kenneth R. Duren |
| collection | DOAJ |
| description | Abstract We 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. |
| format | Article |
| id | doaj-art-37783fd4e593426aaa91d896ba9bbebf |
| institution | OA Journals |
| issn | 2328-5540 |
| language | English |
| publishDate | 2012-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Wildlife Society Bulletin |
| spelling | doaj-art-37783fd4e593426aaa91d896ba9bbebf2025-08-20T01:56:32ZengWileyWildlife Society Bulletin2328-55402012-03-01361162010.1002/wsb.82Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhiteKenneth R. Duren0Jeffrey J. Buler1William L. Jones2Christopher K. Williams3Department of Entomology and Wildlife Ecology, University of Delaware, 250 Townsend Hall, Newark, DE 19716, USADepartment of Entomology and Wildlife Ecology, University of Delaware, 250 Townsend Hall, Newark, DE 19716, USADelaware Division of Fish and Wildlife, 89 Kings Highway, Dover, DE 19977, USADepartment of Entomology and Wildlife Ecology, University of Delaware, 250 Townsend Hall, Newark, DE 19716, USAAbstract We 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.https://doi.org/10.1002/wsb.82call playbackColinus virginianusdistance samplingnorthern bobwhiteoccupancy |
| spellingShingle | Kenneth R. Duren Jeffrey J. Buler William L. Jones Christopher K. Williams Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite Wildlife Society Bulletin call playback Colinus virginianus distance sampling northern bobwhite occupancy |
| title | Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite |
| title_full | Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite |
| title_fullStr | Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite |
| title_full_unstemmed | Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite |
| title_short | Effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite |
| title_sort | effects of broadcasting calls during surveys to estimate density and occupancy of northern bobwhite |
| topic | call playback Colinus virginianus distance sampling northern bobwhite occupancy |
| url | https://doi.org/10.1002/wsb.82 |
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