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Title: Eco-evolutionary responses of Bromus tectorum to climate change: implications for biological invasions

Journal Article · · Ecology and Evolution
DOI:https://doi.org/10.1002/ece3.542· OSTI ID:1623546
 [1];  [2];  [3];  [4];  [2];  [3]
  1. US Geological Survey, Moab, UT (United States). Southwest Biological Science Center; Univ. of Wyoming, Laramie, WY (United States). Berry Biodiversity Conservation Center, Botany Dept.
  2. Colorado State Univ., Fort Collins, CO (United States). Dept. of Bioagricultural Sciences and Pest Management and Graduate Degree Program in Ecology
  3. US Geological Survey, Moab, UT (United States). Southwest Biological Science Center
  4. US Geological Survey, Moab, UT (United States). Southwest Biological Science Center; Univ. of Illinois at Urbana-Champaign, IL (United States). Inst. of Genomic Biology

How plant populations, communities, and ecosystems respond to climate change is a critical focus in ecology today. The responses of introduced species may be especially rapid. Current models that incorporate temperature and precipitation suggest that future Bromus tectorum invasion risk is low for the Colorado Plateau. With a field warming experiment at two sites in southeastern Utah, we tested this prediction over 4 years, measuring B. tectorum phenology, biomass, and reproduction. In a complimentary greenhouse study, we assessed whether changes in field B. tectorum biomass and reproductive output influence offspring performance. We found that following a wet winter and early spring, the timing of spring growth initiation, flowering, and summer senescence all advanced in warmed plots at both field sites and the shift in phenology was progressively larger with greater warming. Earlier green-up and development was associated with increases in B. tectorum biomass and reproductive output, likely due early spring growth, when soil moisture was not limiting, and a lengthened growing season. Seeds collected from plants grown in warmed plots had higher biomass and germination rates and lower mortality than seeds from ambient plots. However, in the following two dry years, we observed no differences in phenology between warmed and ambient plots. In addition, warming had a generally negative effect on B. tectorum biomass and reproduction in dry years and this negative effect was significant in the plots that received the highest warming treatment. In contrast to models that predict negative responses of B. tectorum to warmer climate on the Colorado Plateau, the effects of warming were more nuanced, relied on background climate, and differed between the two field sites. Our results highlight the importance of considering the interacting effects of temperature, precipitation, and site-specific characteristics such as soil texture, on plant demography and have direct implications for B. tectorum invasion dynamics on the Colorado Plateau.

Research Organization:
US Geological Survey, Moab, UT (United States)
Sponsoring Organization:
USDOE
OSTI ID:
1623546
Journal Information:
Ecology and Evolution, Vol. 3, Issue 5; ISSN 2045-7758
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Temperature effects on three downy brome (Bromus tectorum) seed collections inoculated with the fungal pathogen Pyrenophora semeniperda journal May 2019
Using High-Resolution Future Climate Scenarios to Forecast Bromus tectorum Invasion in Rocky Mountain National Park journal February 2015
Warming, competition, and Bromus tectorum population growth across an elevation gradient journal September 2014
Drivers of Bromus tectorum Abundance in the Western North American Sagebrush Steppe journal June 2016
Cheatgrass is favored by warming but not CO 2 enrichment in a semi-arid grassland journal April 2016
A warmer and drier climate in the northern sagebrush biome does not promote cheatgrass invasion or change its response to fire journal October 2017