Evolutionary responses of invasive grass species to variation in precipitation and soil nitrogen
Abstract
Summary Global climate models suggest that many ecosystems will experience reduced precipitation over the next century and the consequences for invasive plant performance are largely unknown. Annual invasive species may be able to quickly evolve traits associated with drought escape or tolerance through rapid genetic changes. We investigated the influence of 5 years of water and nitrogen manipulations on trait values in a southern California grassland system. Seeds from two annual grass species ( Avena barbata and Bromus madritensis ) were collected from experimental plots and grown in a common environment over two generations. We measured 14 physiological, morphological, phenological and reproductive traits. Both species displayed phenotypic differences depending on the water treatment from which they were collected, but not depending on the nitrogen treatment. Both species displayed trait values characteristic of drought escape (e.g. earlier flowering in A. barbata and B. madritensis , lower water‐use efficiency in B. madritensis ) when grown from the seeds collected from plots that experienced five years of reduced precipitation. Furthermore, A. barbata individuals grown from the seeds collected from drought plots had higher reproductive output and higher photosynthetic performance than individuals grown from water addition plots, with individuals grown from ambient plots displaying intermediate trait values. Notably, wemore »
- Authors:
-
- Schmid College of Science and Technology Chapman University Orange CA USA
- Center for Environmental Biology University of California Irvine CA USA
- Department of Earth System Science University of California Irvine CA USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1401422
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Journal of Ecology
- Additional Journal Information:
- Journal Name: Journal of Ecology Journal Volume: 104 Journal Issue: 4; Journal ID: ISSN 0022-0477
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Nguyen, Monica A., Ortega, Amy E., Nguyen, Kurt Q., Kimball, Sarah, Goulden, Michael L., Funk, Jennifer L., and Lau, ed., Jennifer. Evolutionary responses of invasive grass species to variation in precipitation and soil nitrogen. United Kingdom: N. p., 2016.
Web. doi:10.1111/1365-2745.12582.
Nguyen, Monica A., Ortega, Amy E., Nguyen, Kurt Q., Kimball, Sarah, Goulden, Michael L., Funk, Jennifer L., & Lau, ed., Jennifer. Evolutionary responses of invasive grass species to variation in precipitation and soil nitrogen. United Kingdom. https://doi.org/10.1111/1365-2745.12582
Nguyen, Monica A., Ortega, Amy E., Nguyen, Kurt Q., Kimball, Sarah, Goulden, Michael L., Funk, Jennifer L., and Lau, ed., Jennifer. Thu .
"Evolutionary responses of invasive grass species to variation in precipitation and soil nitrogen". United Kingdom. https://doi.org/10.1111/1365-2745.12582.
@article{osti_1401422,
title = {Evolutionary responses of invasive grass species to variation in precipitation and soil nitrogen},
author = {Nguyen, Monica A. and Ortega, Amy E. and Nguyen, Kurt Q. and Kimball, Sarah and Goulden, Michael L. and Funk, Jennifer L. and Lau, ed., Jennifer},
abstractNote = {Summary Global climate models suggest that many ecosystems will experience reduced precipitation over the next century and the consequences for invasive plant performance are largely unknown. Annual invasive species may be able to quickly evolve traits associated with drought escape or tolerance through rapid genetic changes. We investigated the influence of 5 years of water and nitrogen manipulations on trait values in a southern California grassland system. Seeds from two annual grass species ( Avena barbata and Bromus madritensis ) were collected from experimental plots and grown in a common environment over two generations. We measured 14 physiological, morphological, phenological and reproductive traits. Both species displayed phenotypic differences depending on the water treatment from which they were collected, but not depending on the nitrogen treatment. Both species displayed trait values characteristic of drought escape (e.g. earlier flowering in A. barbata and B. madritensis , lower water‐use efficiency in B. madritensis ) when grown from the seeds collected from plots that experienced five years of reduced precipitation. Furthermore, A. barbata individuals grown from the seeds collected from drought plots had higher reproductive output and higher photosynthetic performance than individuals grown from water addition plots, with individuals grown from ambient plots displaying intermediate trait values. Notably, we found no phenotypic variation among treatments for six root traits. Synthesis . Trait differences were observed following two generations in a common garden, suggesting that treatment differences were genetically based. This suggests that populations were responding to selection over the 5 years of water manipulations, a remarkably short time period. The rapid evolutionary responses observed here may help these two widespread invasive grass species thrive under reduced precipitation scenarios, which could have important implications for fire dynamics, invasive species management and native plant restoration in communities invaded by annual grasses.},
doi = {10.1111/1365-2745.12582},
journal = {Journal of Ecology},
number = 4,
volume = 104,
place = {United Kingdom},
year = {Thu May 12 00:00:00 EDT 2016},
month = {Thu May 12 00:00:00 EDT 2016}
}
https://doi.org/10.1111/1365-2745.12582
Web of Science
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