干旱区生态环境知识资源中心(Arid): The relative abundance of desert tortoises on the Nevada Test Site within ecological landform units

Arid

DOI	10.2172/304054
报告编号	DOE/NV/11718--245
来源ID	OSTI_ID: 304054
	The relative abundance of desert tortoises on the Nevada Test Site within ecological landform units
	Woodward, R. [Bechtel National (United States)]; Rautenstrauch, K.R. [Science Applications International Corp. (United States)]; Hall, D.B.; Ostler, W.K. [Bechtel Nevada (United States)]
英文摘要	Sign-survey transects were sampled in 1996 to better determine the relative abundance of desert tortoises on the Nevada Test Site (NTS). These transects were sampled within ecological land-form units (ELUs), which are small, ecologically homogeneous units of land. Two-hundred and six ELUs were sampled by walking 332 transects totaling 889 kilometers (km). These ELUs covered 528 km{sup 2}. Two-hundred and eight-one sign were counted. An average of 0.32 sign was found per km walked. Seventy percent of the area sampled had a very low abundance of tortoises, 29% had a low abundance, and 1% had a moderate abundance. A revised map of the relative abundance of desert tortoise on the NTS is presented. Within the 1,330 km{sup 2} of desert tortoise habitat on the NTS, 49% is classified as having no tortoises or a very low abundance, 18% has a low or moderate abundance, 12% is unclassified land being used by the Yucca Mountain Site Characterization Project, and the remaining 21% still has an unknown abundance of desert tortoises. Based on the results of this work, the amount of tortoise habitat previously classified as having an unknown or low-moderate abundance, and on which clearance surveys and on-site monitoring was required, has been reduced by 20%.
出版年	1998
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	54 ENVIRONMENTAL SCIENCES ; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE ; NEVADA TEST SITE ; ENVIRONMENTAL IMPACTS ; BIOLOGICAL INDICATORS ; TURTLES ; POPULATION DYNAMICS ; HABITAT ; NUMERICAL DATA ; LAND POLLUTION
URL	http://www.osti.gov/scitech/servlets/purl/304054
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/267603
推荐引用方式 GB/T 7714	Woodward, R. [Bechtel National ,Rautenstrauch, K.R. [Science Applications International Corp. ,Hall, D.B.,et al. The relative abundance of desert tortoises on the Nevada Test Site within ecological landform units,1998.