Arid
DOI10.2307/3803111
Field trials of line transect methods applied to estimation of desert tortoise abundance
Anderson, DR; Burnham, KP; Lubow, BC; Thomas, L; Corn, PS; Medica, PA; Marlow, RW
通讯作者Anderson, DR
来源期刊JOURNAL OF WILDLIFE MANAGEMENT
ISSN0022-541X
出版年2001
卷号65期号:3页码:583-597
英文摘要

We examine the degree to which field observers can meet the assumptions underlying line transect sampling to monitor populations of desert tortoises (Gopherus agassizii). We present the results of 2 field trials using artificial tortoise models in 3 size classes. The trials were conducted on 2 occasions on an area south of Las Vegas, Nevada, where the density of the test population was known. In the first trials, conducted largely by experienced biologists who had been involved in tortoise surveys for many years, the density of adult tortoise models was well estimated (-3.9% bias),while the bias was higher (-20%) for subadult tortoise models. The bias for combined data was -12.0%. The bias was largely attributed to the failure to detect all tortoise models on or near the that first centerline. The second trials were conducted with a group of largely inexperienced student volunteers and used somewhat different searching methods, and the results were similar to the first trials. Estimated combined density of subadult and adult tortoise models had a negative bias (-7.3%), again attributable to failure to detect some models on or near the centerline. Experience in desert tortoise biology, either comparing the first and second trials or in the second trial with 2 experienced biologists versus 16 novices, did not have an apparent effect on the quality of the data or the accuracy of the estimates. Observer training, specific to line transect sampling, and field testing are important components of a reliable survey. Line transect sampling represents a viable method for large-scale monitoring of populations of desert tortoise; however, field protocol must be improved to assure the key assumptions are met.


英文关键词density estimation desert tortoise distance sampling field trials line transect sampling monitoring observer performance
类型Article
语种英语
国家USA ; Scotland
收录类别SCI-E
WOS记录号WOS:000169650900024
WOS关键词MACROPOD DENSITY ; COUNTS ; ISSUES ; DESIGN
WOS类目Ecology ; Zoology
WOS研究方向Environmental Sciences & Ecology ; Zoology
来源机构United States Geological Survey ; Colorado State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/141417
作者单位(1)Colorado State Univ, Colorado Cooperat Fish & Wildlife Res Unit, Ft Collins, CO 80523 USA;(2)Univ St Andrews, Math Inst, Res Unit Wildlife Populat Assessment, St Andrews KY16 9SS, Fife, Scotland;(3)US Geol Survey, No Rocky Mt Sci Ctr, Aldo Leopold Wilderness Res Inst, Missoula, MT USA;(4)US Geol Survey, Western Ecol Res Ctr, Las Vegas, NV 89108 USA;(5)Univ Nevada, Las Vegas, NV 89146 USA
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GB/T 7714
Anderson, DR,Burnham, KP,Lubow, BC,et al. Field trials of line transect methods applied to estimation of desert tortoise abundance[J]. United States Geological Survey, Colorado State University,2001,65(3):583-597.
APA Anderson, DR.,Burnham, KP.,Lubow, BC.,Thomas, L.,Corn, PS.,...&Marlow, RW.(2001).Field trials of line transect methods applied to estimation of desert tortoise abundance.JOURNAL OF WILDLIFE MANAGEMENT,65(3),583-597.
MLA Anderson, DR,et al."Field trials of line transect methods applied to estimation of desert tortoise abundance".JOURNAL OF WILDLIFE MANAGEMENT 65.3(2001):583-597.
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