Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.2307/3803111 |
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
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ISSN | 0022-541X |
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 |
推荐引用方式 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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