Arid
DOI10.1111/1365-2745.12852
Invasive Bromus tectorum alters natural selection in arid systems
Leger, Elizabeth A.1; Goergen, Erin M.2
通讯作者Leger, Elizabeth A.
来源期刊JOURNAL OF ECOLOGY
ISSN0022-0477
EISSN1365-2745
出版年2017
卷号105期号:6页码:1509-1520
英文摘要

1. While much research has documented the impact of invaders on native communities and ecosystem services, there has been less work quantifying how invasion affects the genetic composition of native populations. That is, when invaders dominate a community, can they shift selection regimes and impact the evolutionary trajectory of native populations?


2. The invasion of the annual grass Bromus tectorum in the Intermountain West provides an opportunity to quantify the effects of invasion on natural selection in wild populations. The shift from a perennial-dominated native community to one dominated by a highly competitive annual species alters the timing and intensity of competitive pressure, which has the potential to strongly shift selection regimes for native plants.


3. To quantify traits under selection in contrasting environments, we planted seeds of two native perennial grasses, Elymus multisetus and Poa secunda, into three invaded, invaded but weeded and relatively uninvaded sagebrush systems. We quantified phenotypic traits of seedlings from separate maternal plants, describing differences in phenotypes among individuals. We then asked which traits were associated with survival and plant size in adjacent invaded and uninvaded sagebrush systems, following individual seed performance for 3 years.


4. We found evidence for divergent selection between invaded and uninvaded sagebrush systems, with contrasting phenotypic traits associated with greater survival or plant size in these different growing conditions at all three field sites. For example, at one field site, P. secunda families with higher root tip production were more likely to survive in invaded and weeded environments, but this was not the case in uninvaded environments. Similarly, for E. multisetus, root mass fraction, seed mass and allocation to coarse or fine roots affected survival and plant size, again with contrasting relationships across invaded, weeded or uninvaded environments.


5. Synthesis. Impacts of invasive species extend beyond ecosystem and community composition changes and can affect the evolutionary trajectory of native populations. By quantifying natural selection in invaded landscapes, we identified phenotypic traits that are potentially adaptive in these invaded systems. Importantly, these traits differed from traits associated with success in uninvaded communities. This insight into adaptive, contemporary evolution in native species can guide restoration and conservation efforts.


英文关键词Bromus tectorum common garden Elymus multisetus evolution invasion ecology phenotypic traits plant-plant interactions Poa secunda reciprocal transplant selection gradient
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000413341700006
WOS关键词EXOTIC PLANT INVASIONS ; PHENOTYPIC SELECTION ; LOCAL ADAPTATION ; CLIMATE-CHANGE ; ANNUAL GRASS ; GREAT-BASIN ; SEED SIZE ; EVOLUTIONARY RESPONSES ; BIOLOGICAL INVASIONS ; SERPENTINE SOILS
WOS类目Plant Sciences ; Ecology
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200327
作者单位1.Univ Nevada, Dept Nat Resources & Environm Sci, Mail Stop 186,1664 N Virginia St, Reno, NV 89557 USA;
2.St Petersburg Coll, Dept Nat Sci, 2465 Drew St, Clearwater, FL 33765 USA
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GB/T 7714
Leger, Elizabeth A.,Goergen, Erin M.. Invasive Bromus tectorum alters natural selection in arid systems[J],2017,105(6):1509-1520.
APA Leger, Elizabeth A.,&Goergen, Erin M..(2017).Invasive Bromus tectorum alters natural selection in arid systems.JOURNAL OF ECOLOGY,105(6),1509-1520.
MLA Leger, Elizabeth A.,et al."Invasive Bromus tectorum alters natural selection in arid systems".JOURNAL OF ECOLOGY 105.6(2017):1509-1520.
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