Arid
DOI10.2307/3802929
Distance sampling for Sonoran Desert tortoises
Swann, DE; Averill-Murray, RC; Schwalbe, CR
通讯作者Swann, DE
来源期刊JOURNAL OF WILDLIFE MANAGEMENT
ISSN0022-541X
EISSN1937-2817
出版年2002
卷号66期号:4页码:969-975
英文摘要

We used line transects and distance sampling in combination with radiotelemetry to estimate density of a desert tortoise (Gopherus agassizii) population in the Rincon Mountains near Tucson, Arizona, USA, as part of a long. term study evaluating the impact of urban development on tortoises. During 2000, 34 I-km transects were each sampled twice in the 368.5-ha study area. We observed 46 tortoises with midline carapace lengths greater than or equal to 150 mm (subadults and adults) plus 7 juveniles on transects. For subadults and adults, the encounter rate was 0.63 tortoises/km, and the mean proportion of tortoises observable during radiotelemetry, conducted concurrently with transect sampling, was 82%. Corrected mean density based on line transects and radiotelemetry was 0.523 tortoises/ha (CV = 22.99, 95% CI = 0.29-0.79), and absolute abundance in the study area was estimated to be 193 (CV = 23.0%, CI = 107-291). Using the 2 independent coverages of transects as separate samples, the Lincoln-Petersen mark-recapture estimator produced an abundance estimate of 224 subadult and adult tortoises (CV = 53.9%, CI = 72-440). Transects measured on the ground over uneven topography resulted in 3% smaller estimates of density when compared to analysis with transect lengths determined from coordinates plotted on a map. Distance sampling appears to be a feasible method of estimating density of Sonoran Desert populations of the desert tortoise, but transect lengths should be based on mapped rather than measured distances to prevent biases caused by uneven topography.


英文关键词abundance estimation Arizona density estimation desert tortoise distance sampling Gopherus agassizii line transect radiotelemetry Sonoran Desert
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000179706800004
WOS关键词DENSITY
WOS类目Ecology ; Zoology
WOS研究方向Environmental Sciences & Ecology ; Zoology
来源机构University of Arizona ; United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/143331
作者单位(1)Saguaro Natl Pk, Tucson, AZ 85730 USA;(2)Arizona Game & Fish Dept, Phoenix, AZ 85023 USA;(3)Univ Arizona, US Geol Survey, Sonoran Desert Field Stn, Tucson, AZ 85721 USA
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Swann, DE,Averill-Murray, RC,Schwalbe, CR. Distance sampling for Sonoran Desert tortoises[J]. University of Arizona, United States Geological Survey,2002,66(4):969-975.
APA Swann, DE,Averill-Murray, RC,&Schwalbe, CR.(2002).Distance sampling for Sonoran Desert tortoises.JOURNAL OF WILDLIFE MANAGEMENT,66(4),969-975.
MLA Swann, DE,et al."Distance sampling for Sonoran Desert tortoises".JOURNAL OF WILDLIFE MANAGEMENT 66.4(2002):969-975.
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