干旱区生态环境知识资源中心(Arid): Positive associations with native shrubs are intense and important for an exotic invader but not the native annual community across an aridity gradient

Arid

DOI	10.1111/ddi.13111
	Positive associations with native shrubs are intense and important for an exotic invader but not the native annual community across an aridity gradient
	Lucero, Jacob E.1; Seifan, Merav 2; Callaway, Ragan M.3,4; Lortie, Christopher J.1
通讯作者	Lucero, Jacob E.
来源期刊	DIVERSITY AND DISTRIBUTIONS
ISSN	1366-9516
EISSN	1472-4642
出版年	2020
卷号	26 期号:9 页码:1177-1197
英文摘要	Aim and Location Positive interactions influence the assembly of plant communities globally, particularly in stressful environments such as deserts. However, few studies have measured the intensity and relative importance of positive interactions involving native and invasive species along aridity gradients. These measures are essential for predicting how dryland communities will respond to biological invasions and environmental change. Here, we measured the intensity and importance of positive associations formed between native shrubs and the annual plant community, which included highly invasiveBromus madritensisssp.rubens(B. rubens) and native neighbours, along an aridity gradient across the Mojave and San Joaquin Deserts. Methods Along the gradient, we sampled metrics of abundance and performance for invasiveB. rubens, native annual species (pooled), exotic annual species (pooled) and all annual species (pooled) during peak flowering at 120 pairs of shrub and open microsites. Results Across the gradient,B. rubensoccurred at far greater abundance, cover, biomass and fitness near shrubs than away from shrubs. WhenLarrea tridentatawas the focal shrub, positive effects onB. rubensabundance and cover were least intense at the most arid sites under the shortest shrubs. The native annual community occurred at greater abundance, cover and species richnessawayfrom shrubs, regardless of relative aridity or shrub traits. Community-level species richness was greatest away from shrubs, but exotic species richness was similar in shrub and open microsites. Main conclusions Across two deserts,B. rubensformed intense and important positive associations with native shrubs that consistently improved its abundance, cover, biomass and fitness, and for abundance and cover, the intensity ofB. rubens-L. tridentataassociations depended upon relative aridity and shrub height. By strongly facilitating a dominant invader but not native- or community-level biodiversity, native shrubs provided the wrong kind of help to the annual plant community.
英文关键词	Bromus rubens deserts environmental gradients facilitation invasive species positive interactions shrubs stress-gradient hypothesis
类型	Article
语种	英语
国家	Canada ; Israel ; USA
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000543919400001
WOS关键词	INVASIVE ALIEN PLANTS ; MOJAVE DESERT ; NURSE-PLANTS ; STRESS GRADIENTS ; CLIMATE-CHANGE ; BROMUS-RUBENS ; FACILITATION ; RESTORATION ; IMPACTS ; INTERFERENCE
WOS类目	Biodiversity Conservation ; Ecology
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	Ben-Gurion University of the Negev
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319480
作者单位	1.York Univ, Dept Biol, 3200 Keele St, Toronto, ON M3J 1P3, Canada; 2.Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Swiss Inst Dryland Environm & Energy Res, Mitrani Dept Desert Ecol, Midreshet Ben Gurion, Israel; 3.Univ Montana, Div Biol Sci, Missoula, MT 59812 USA; 4.Univ Montana, Inst Ecosyst, Missoula, MT 59812 USA
推荐引用方式 GB/T 7714	Lucero, Jacob E.,Seifan, Merav,Callaway, Ragan M.,et al. Positive associations with native shrubs are intense and important for an exotic invader but not the native annual community across an aridity gradient[J]. Ben-Gurion University of the Negev,2020,26(9):1177-1197.
APA	Lucero, Jacob E.,Seifan, Merav,Callaway, Ragan M.,&Lortie, Christopher J..(2020).Positive associations with native shrubs are intense and important for an exotic invader but not the native annual community across an aridity gradient.DIVERSITY AND DISTRIBUTIONS,26(9),1177-1197.
MLA	Lucero, Jacob E.,et al."Positive associations with native shrubs are intense and important for an exotic invader but not the native annual community across an aridity gradient".DIVERSITY AND DISTRIBUTIONS 26.9(2020):1177-1197.