Skip to Main Content
Invasion Dynamics and Genotypic Diversity of Cogongrass (Imperata cylindrica) at the Point of Introduction in the Southeastern United StatesAuthor(s): Ludovic J. A. Capo-chichi; Wilson H. Faircloth; A. G. Williamson; Michael G. Patterson; James H. Miller; Edzard van Santen
Source: Invasive Plant Science and Management, Vol. 1, p. 133-141
Publication Series: Miscellaneous Publication
PDF: View PDF (2.3 MB)
DescriptionNine sites of cogongrass were included in a study of genotypic dimity and spread dynamics at the point of introduction and its adjacent areas in the southern United States. Clones evaluated with two primer pairs yielded a total of 137 amplified fragment length polymorphism (AFLP) hi of which 102 (74.4%) were polymorphic. Genetic diversity was measured as the percentage of polymorphic, Shannon's information index, Nei's gene diversity, and panmitctic heterozygosity. Nei's gene diversity (Hs)across all nine rim was estimated to be 0.11 and within site gene diversity ranged from 0.06 to 0.16. Bayesian estimate of gene diversity and Shannon's information index were higher (0.17 and 0.17, respectively). The samples from the point of introduction (Pi) had the lowest genetic diversity for all types of estimates. Within site variance accounted for 56% of the total variation and among site variance 44% (P < 0.05). Differentiatian among sites was assessed using Fsr . The greatest difference was found between the Pi and the others. No relationship was found between genetic and geographic distances. Principal component analysis as well as duster analysis separated individuals into three main dusters. The Pi formed a separate subcluster. Gene flow (Nm), inferred from Î¦-statistics describing the numeric differentiation between pairs of sites ranged from 0.6 to 5.55. The lack of significant relationship between gene flow and geographic distance as well as genetic and geographic distances suggests that the invasion dynamics of cogongrass into the southern United States is primarily through anthropogenic activities and to the lesser extent through natural forces.
- You may send email to email@example.com 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.
CitationCapo-chichi, Ludovic J. A.; Faircloth, Wilson H.; Williamson, A. G.; Patterson, Michael G.; Miller, James H.; van Santen, Edzard. 2008. Invasion Dynamics and Genotypic Diversity of Cogongrass (Imperata cylindrica) at the Point of Introduction in the Southeastern United States. Invasive Plant Science and Management, Vol. 1, p. 133-141
Keywordsinvasive species, molecular makers, gene diversity, plant introduction
- Invasion success in Cogongrass (Imperata cylindrica): A population genetic approach exploring genetic diversity and historical introductions
- Evaluating hybridization as a potential facilitator of successful cogongrass (Imperata cylindrica) invasion in Florida, USA
- Refining rates and treatment sequences for cogongrass (Imperata Cylindrica) control with imazapyr and glyphosate
XML: View XML