Skip to Main Content
Genetic variation and local adaptation at a cheatgrass (Bromus tectorum) invasion edge in western NevadaAuthor(s): Elizabeth A. Leger; Erin K. Espeland; Keith R. Merrill; Susan E. Meyer
Source: Molecular Ecology. 18: 4366-4379.
Publication Series: Miscellaneous Publication
PDF: View PDF (334.16 KB)
DescriptionCheatgrass (Bromus tectorum) is an invasive weed in western North America found primarily growing at elevations less than 2200 m. We asked whether cheatgrass is capable of becoming adapted to a marginal habitat, by investigating a population at a high elevation invasion edge. We used a combination of methods, including reciprocal field transplants, controlled environment studies and molecular analysis. High levels of SSR gene diversity (0.50 vs. 0.43) and comparable variation in phenotypic traits were observed at both the invasion edge and a low elevation, high-density population. Three heterozygotes were observed in the edge population, which is unusual in this predominantly self-pollinating plant. Plants from high elevations germinated more slowly in a growth chamber and had slower seedling growth rates. Survivorship was low at the edge (13%), compared with the low elevation site (55%), but surviving plants were of similar size and had equivalent reproductive output. Seed size positively affected survival and plant performance in the field and this trait was inherited. Emergence timing affected survival at the low elevation site and germination timing was also inherited. Local adaptation was seen in the low, rather than in the high elevation site, because of differential survival. While there was no evidence for local adaptation to the high elevation site observed in the field, family level and genotype-level differences in traits that affected field performance, high genetic diversity at the invasion edge, and evidence of outcrossing in this highly selfing species indicates that the potential for adaptation to a marginal habitat exists within this population.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLeger, Elizabeth A.; Espeland, Erin K.; Merrill, Keith R.; Meyer, Susan E. 2009. Genetic variation and local adaptation at a cheatgrass (Bromus tectorum) invasion edge in western Nevada. Molecular Ecology. 18: 4366-4379.
Keywordsinvasive species, local adaptation, natural selection, range limits, secondary invasion, selfing
- Fire effects on the mobilization and uptake of nitrogen by cheatgrass (Bromus tectorum L.)
- Cheatgrass - native plant community interactions in an invaded southwestern forest
- Cheatgrass (Bromus tectorum) biocontrol using indigenous fungal pathogens
XML: View XML