干旱区生态环境知识资源中心(Arid): Survival and movements of head-started Mojave desert tortoises

Arid

DOI	10.1002/jwmg.21758
	Survival and movements of head-started Mojave desert tortoises
	Daly, Jacob A.1,4; Buhlmann, Kurt A.1; Todd, Brian D.2; Moore, Clinton T.3; Peaden, J. Mark 2; Tuberville, Tracey D.1
通讯作者	Daly, Jacob A.
来源期刊	JOURNAL OF WILDLIFE MANAGEMENT
ISSN	0022-541X
EISSN	1937-2817
出版年	2019
卷号	83 期号:8 页码:1700-1710
英文摘要	Head-starting is a conservation strategy in which young animals are protected in captivity temporarily before their release into the wild at a larger size, when their survival is presumably increased. The Mojave desert tortoise (Gopherus agassizii) is in decline, and head-starting has been identified as one of several conservation measures to assist in recovery. To evaluate the efficacy of indoor head-starting, we released and radio-tracked 68 juvenile tortoises from a 2015 cohort in the Mojave National Preserve, California, USA. We released 20 tortoises at hatching (control) in September 2015, and reared 28 indoors and 20 outdoors in predator-proof enclosures for 7 months before releasing them in April 2016. We monitored tortoises at least weekly after release until 27 October 2016, and documented survivorship, movement, and surface activity. We estimated survivorship by treatment and evaluated effects of treatment, proximity to a raven (Corvus corax) nest (predator) coincidentally established after release, distance moved between monitoring events, surface activity, and release size on individual fate in a generalized linear model. Although indoor head-start tortoises reached the size of 5-6-year-old wild tortoises by release at 7 months of age, survival did not differ significantly among the 3 treatment groups. Combined annual survival was 0.44 (95% CI = 0.34-0.58). Tortoises that were closer to an active raven nest were significantly more likely to die, as were those seen more often outside their burrows and active aboveground. Predicted estimates for short-term probability of survival approached 1.0 as distance from a raven nest exceeded approximately 1.6 km. Rearing treatment, movement distance, and body size were not significant predictors of fate over the 1-year monitoring period. Head-started tortoises released >= 1.6 km from areas of raven activity will likely have higher short-term survival. Population recovery through head-starting alone is unlikely to be successful if systemic ecosystem-level issues, such as habitat degradation and conditions that promote human-subsidized predators, are not ameliorated. (c) 2019 The Wildlife Society.
英文关键词	chelonian conservation desert tortoise endangered species head-start Mojave Desert population augmentation species recovery threatened species turtle
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000487726200001
WOS关键词	COMMON RAVEN PREDATION ; GOPHERUS-AGASSIZII ; BODY CONDITION ; ASSISTED MIGRATION ; HABITAT SELECTION ; MANAGEMENT ; POPULATION ; TURTLES ; GROWTH ; SIZE
WOS类目	Ecology ; Zoology
WOS研究方向	Environmental Sciences & Ecology ; Zoology
来源机构	United States Geological Survey ; University of California, Davis
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217430
作者单位	1.Univ Georgias, Savannah River Ecol Lab, PO Drawer E, Aiken, SC 29802 USA; 2.Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, One Shields Ave, Davis, CA 95616 USA; 3.Univ Georgia, US Geol Survey, Georgia Cooperat Fish & Wildlife Res Unit, Athens, GA 30602 USA; 4.Environm Div, Camp Pk Reserve Forces Training Area, Directorate Publ Works, Dublin, CA 94568 USA
推荐引用方式 GB/T 7714	Daly, Jacob A.,Buhlmann, Kurt A.,Todd, Brian D.,et al. Survival and movements of head-started Mojave desert tortoises[J]. United States Geological Survey, University of California, Davis,2019,83(8):1700-1710.
APA	Daly, Jacob A.,Buhlmann, Kurt A.,Todd, Brian D.,Moore, Clinton T.,Peaden, J. Mark,&Tuberville, Tracey D..(2019).Survival and movements of head-started Mojave desert tortoises.JOURNAL OF WILDLIFE MANAGEMENT,83(8),1700-1710.
MLA	Daly, Jacob A.,et al."Survival and movements of head-started Mojave desert tortoises".JOURNAL OF WILDLIFE MANAGEMENT 83.8(2019):1700-1710.