干旱区生态环境知识资源中心(Arid): Feral Burros and Other Influences on Desert Tortoise Presence in the Western Sonoran Desert

Arid

DOI	10.1655/Herpetologica-D-20-00023.1
	Feral Burros and Other Influences on Desert Tortoise Presence in the Western Sonoran Desert
	Berry, Kristin H.; Yee, Julie L.; Lyren, Lisa M.
通讯作者	Berry, KH (corresponding author), US Geol Survey, Western Ecol Res Ctr, 3621 Pinot Grigio Way, Reno, NV 89509 USA.
来源期刊	HERPETOLOGICA
ISSN	0018-0831
EISSN	1938-5099
出版年	2020
卷号	76 期号:4 页码:403-413
英文摘要	Across the globe, conflicting priorities exist in how land and resources are managed. In the American West, conflicts are common on public lands with historical mandates for multiple uses. We explored the impacts of multiple uses of land in a case study of Agassiz's Desert Tortoises (Gopherus agassizii), a federally threatened species, in the western Sonoran Desert. The tortoise has declined for many reasons, most of which relate to management of land and habitat. Frequently cited causes are livestock grazing, roads, vehicle-oriented recreation, predators, and disease. In spring of 2009, we conducted a survey to evaluate relationships between desert tortoises, vegetation associations, topography, predators, and anthropogenic uses. We sampled a 93-km(2) area with 200 independent 1-ha plots. Density (+/- SE) of adult tortoises was low, 2.0 +/- 1.0/km(2), and the annualized death rate for adults during the 4 yr preceding the survey was high, 13.1%/yr. We observed tortoise sign, most of which was recent, on 22% of the 200 plots, primarily in the southwestern part of the study area. More tortoise sign occurred on plots with Brittlebush (Encelia spp.) vegetation at higher elevations. Most plots (91.0%) had >= 1 human-related impacts: feral burro scat (Equus asinus; 84.0%), recent vehicle tracks and trails (34.0%), trash (28.0%), burro trails and wallows (26.5%), and old vehicle tracks (24.0%). We used a multimodel approach to model presence of tortoise sign on the basis of 12 predictor variables, and calculated model-averaged predictions for the probability of tortoise presence. Importance values revealed two apparent top drivers: feral burros and vegetation association. This is the first study to identify a negative association between presence of desert tortoises and feral burros.
英文关键词	Equus asinus Gopherus agassizii Trash Vehicles Vegetation association
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000599521400006
WOS关键词	GOPHERUS-AGASSIZII ; MOJAVE DESERT ; EQUUS-ASINUS ; POPULATIONS ; MANAGEMENT ; CALIFORNIA ; HORSES
WOS类目	Zoology
WOS研究方向	Zoology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348897
作者单位	[Berry, Kristin H.] US Geol Survey, Western Ecol Res Ctr, 3621 Pinot Grigio Way, Reno, NV 89509 USA; [Yee, Julie L.] US Geol Survey, Western Ecol Res Ctr, 2885 Mission St, Santa Cruz, CA 95060 USA; [Lyren, Lisa M.] US Geol Survey, Western Ecol Res Ctr, 2177 Salk Ave,Suite 250, Carlsbad, CA 92008 USA; [Lyren, Lisa M.] NAVFAC, San Diego, CA 92136 USA
推荐引用方式 GB/T 7714	Berry, Kristin H.,Yee, Julie L.,Lyren, Lisa M.. Feral Burros and Other Influences on Desert Tortoise Presence in the Western Sonoran Desert[J]. United States Geological Survey,2020,76(4):403-413.
APA	Berry, Kristin H.,Yee, Julie L.,&Lyren, Lisa M..(2020).Feral Burros and Other Influences on Desert Tortoise Presence in the Western Sonoran Desert.HERPETOLOGICA,76(4),403-413.
MLA	Berry, Kristin H.,et al."Feral Burros and Other Influences on Desert Tortoise Presence in the Western Sonoran Desert".HERPETOLOGICA 76.4(2020):403-413.