干旱区生态环境知识资源中心(Arid): Life-history strategy and extinction risk in the warm desert perennial spring ephemeral Astragalus holmgreniorum (Fabaceae)

Arid

DOI	10.1002/ece3.8301
	Life-history strategy and extinction risk in the warm desert perennial spring ephemeral Astragalus holmgreniorum (Fabaceae)
	Van Buren, Renee; Searle, Allyson B.; Meyer, Susan E.
通讯作者	Meyer, SE (corresponding author), USDA, Shrub Sci Lab, Forest Serv Rocky Mt Res Stn, 735 North 500 East, Provo, UT 84606 USA.
来源期刊	ECOLOGY AND EVOLUTION
ISSN	2045-7758
出版年	2021
英文摘要	This study of Astragalus holmgreniorum examines its adaptations to the warm desert environment and whether these adaptations will enable it to persist. Its spring ephemeral hemicryptophyte life-history strategy is unusual in warm deserts. We used data from a 22-year demographic study supplemented with reproductive output, seed bank, and germinant survival studies to examine the population dynamics of this species using discrete-time stochastic matrix modeling. The model showed that A. holmgreniorum is likely to persist in the warm desert in spite of high dormant-season mortality. It relies on a stochastically varying environment with high inter-annual variation in precipitation for persistence, but without a long-lived seed bank, environmental stochasticity confers no advantage. Episodic high reproductive output and frequent seedling recruitment along with a persistent seed bank are adaptations that facilitate its survival. These adaptations place its life-history strategy further along the spectrum from slower to faster relative to other perennial spring ephemerals. The extinction risk for small populations is relatively high even though mean lambda(s) > 1 because of the high variance in year quality. This risk is also strongly dependent on seed bank starting values, creating a moving window of extinction risk that varies with population size through time. Astragalus holmgreniorum life-history strategy combines the perennial spring ephemeral life form with features more characteristic of desert annuals. These adaptations permit persistence in the warm desert environment. A promising conclusion is that new populations of this endangered species can likely be established through direct seeding.
英文关键词	endangered species fast-slow continuum hemicryptophyte matrix modeling Mojave Desert persistent seed bank population viability analysis spring ephemeral
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000714820100001
WOS关键词	R-SELECTION ; POPULATION ; PHENOLOGY ; GROWTH ; RATES
WOS类目	Ecology ; Evolutionary Biology
WOS研究方向	Environmental Sciences & Ecology ; Evolutionary Biology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/367708
作者单位	[Van Buren, Renee; Searle, Allyson B.] Utah Valley Univ, Dept Biol, Orem, UT USA; [Meyer, Susan E.] USDA, Shrub Sci Lab, Forest Serv Rocky Mt Res Stn, 735 North 500 East, Provo, UT 84606 USA
推荐引用方式 GB/T 7714	Van Buren, Renee,Searle, Allyson B.,Meyer, Susan E.. Life-history strategy and extinction risk in the warm desert perennial spring ephemeral Astragalus holmgreniorum (Fabaceae)[J],2021.
APA	Van Buren, Renee,Searle, Allyson B.,&Meyer, Susan E..(2021).Life-history strategy and extinction risk in the warm desert perennial spring ephemeral Astragalus holmgreniorum (Fabaceae).ECOLOGY AND EVOLUTION.
MLA	Van Buren, Renee,et al."Life-history strategy and extinction risk in the warm desert perennial spring ephemeral Astragalus holmgreniorum (Fabaceae)".ECOLOGY AND EVOLUTION (2021).