气候变化领域集成服务门户(CCPortal): Rainfall variability maintains grass-forb species coexistence

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DOI	10.1111/ele.13341
	Rainfall variability maintains grass-forb species coexistence
	Hallett L.M.; Shoemaker L.G.; White C.T.; Suding K.N.
发表日期	2019
ISSN	1461023X
卷号	22 期号:10
英文摘要	Environmental variability can structure species coexistence by enhancing niche partitioning. Modern coexistence theory highlights two fluctuation-dependent temporal coexistence mechanisms —the storage effect and relative nonlinearity – but empirical tests are rare. Here, we experimentally test if environmental fluctuations enhance coexistence in a California annual grassland. We manipulate rainfall timing and relative densities of the grass Avena barbata and forb Erodium botrys, parameterise a demographic model, and partition coexistence mechanisms. Rainfall variability was integral to grass–forb coexistence. Variability enhanced growth rates of both species, and early-season drought was essential for Erodium persistence. While theoretical developments have focused on the storage effect, it was not critical for coexistence. In comparison, relative nonlinearity strongly stabilised coexistence, where Erodium experienced disproportionately high growth under early-season drought due to competitive release from Avena. Our results underscore the importance of environmental variability and suggest that relative nonlinearity is a critical if underappreciated coexistence mechanism. © 2019 John Wiley & Sons Ltd/CNRS
英文关键词	Avena; California grasslands; Erodium; fluctuation-dependent; modern coexistence theory; rangelands; relative nonlinearity; resource acquisitive; storage effect; stress tolerant
语种	英语
scopus关键词	Avena; Avena barbata; Erodium; Erodium botrys; rain; California; classification; drought; grassland; growth, development and aging; Poaceae; California; Droughts; Grassland; Poaceae; Rain
来源期刊	Ecology Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/121047
作者单位	Environmental Studies Program and Department of Biology, University of Oregon, Eugene, OR 97403, United States; Botany Department, University of Wyoming, Laramie, WY 82071, United States; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, United States
推荐引用方式 GB/T 7714	Hallett L.M.,Shoemaker L.G.,White C.T.,et al. Rainfall variability maintains grass-forb species coexistence[J],2019,22(10).
APA	Hallett L.M.,Shoemaker L.G.,White C.T.,&Suding K.N..(2019).Rainfall variability maintains grass-forb species coexistence.Ecology Letters,22(10).
MLA	Hallett L.M.,et al."Rainfall variability maintains grass-forb species coexistence".Ecology Letters 22.10(2019).