Arid
DOI10.1016/j.biocon.2009.06.025
Vital rate sensitivity analysis as a tool for assessing management actions for the desert tortoise
Reed, J. Michael1; Fefferman, Nina2; Averill-Murray, Roy C.3
通讯作者Reed, J. Michael
来源期刊BIOLOGICAL CONSERVATION
ISSN0006-3207
出版年2009
卷号142期号:11页码:2710-2717
英文摘要

Sensitivity analyses of population growth in desert tortoise (Gopherus agassizii) have shown no consensus on the limiting vital rate. More importantly, the most sensitive vital rate might not be the most readily manipulated by management, so it begs the question of what actions would be most effective. We compared 13 management alternatives using a vital rate sensitivity analysis that is valid regardless of age structure, and is sensitive to initial population size and time frame, to determine the efforts required for equivalent population growth. We evaluated three time frames, each with five initial population sizes and three initial age distributions. To achieve equivalent population growth, mortality of older females needed to be reduced less than did mortality of other age classes. Similarly, fewer adults needed to be introduced to a population to have the same effect as releasing juveniles, but differences among adult age classes were trivial. A single release (headstarting) required fewer total individuals than did annual releases to achieve the same population growth. Also, the same population growth was more easily achieved when the initial age structure was deficient of young animals. Interestingly, because small tortoises are difficult to survey, some management alternatives could result in increased population size but decreased numbers of countable individuals over short to intermediate (25 years) time frames. Our paper demonstrates an approach to determine what constitutes equivalent management actions for population growth, thus allowing managers to more directly compare expected gains toward population recovery achieved by their resource-allocation decisions. (C) 2009 Elsevier Ltd. All rights reserved.


英文关键词Population viability Adaptive management Elasticity Turtle Head-starting Translocation
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000270203100037
WOS关键词NORTH-AMERICAN TORTOISES ; GOPHERUS-AGASSIZII ; MOJAVE DESERT ; POPULATION VIABILITY ; CONSERVATION STRATEGIES ; TURTLE CONSERVATION ; EGG-PRODUCTION ; LIFE-HISTORY ; MODELS ; TRANSLOCATION
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/160000
作者单位1.Tufts Univ, Dept Biol, Medford, MA 02155 USA;
2.Rutgers State Univ, DIMACS, Piscataway, NJ 08854 USA;
3.US Fish & Wildlife Serv, Desert Tortoise Recovery Off, Reno, NV 89502 USA
推荐引用方式
GB/T 7714
Reed, J. Michael,Fefferman, Nina,Averill-Murray, Roy C.. Vital rate sensitivity analysis as a tool for assessing management actions for the desert tortoise[J],2009,142(11):2710-2717.
APA Reed, J. Michael,Fefferman, Nina,&Averill-Murray, Roy C..(2009).Vital rate sensitivity analysis as a tool for assessing management actions for the desert tortoise.BIOLOGICAL CONSERVATION,142(11),2710-2717.
MLA Reed, J. Michael,et al."Vital rate sensitivity analysis as a tool for assessing management actions for the desert tortoise".BIOLOGICAL CONSERVATION 142.11(2009):2710-2717.
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