Document Type

Article

Publication Date

2020

DOI

10.3390/plants9040423

Publication Title

Plants

Volume

9

Issue

4

Pages

13 pp.

Abstract

The spatial expansions of invasive organisms in the novel range are generally expected to follow an isolation-by-distance relationship (IBD) if the invasion is biologically driven; however, many invasions are facilitated anthropogenically. This research focused on the extant expansion patterns of cogongrass (Imperata cylindrica). Cogongrass is a widespread invasive species throughout the southern United States (US). Patterns of infestation vary among US states. Cogongrass is pyrogenic, and its invasion threatens softwood (Pinus spp.) plantations, a substantial economic market for this US region. Over 600 individuals were sampled from seven invaded US states, using amplified fragment length polymorphisms (AFLPs) to assess genetic diversity and population structure. We suspected that differences in historical management efforts among US states influenced differences in genetic diversity and structure. We detected two genetic lineages at the highest level of analysis. One genetic lineage was locally restricted, whereas the other was found throughout the study region. Admixed individuals were found in all US states and consistently co-occurred with the dominant lineage, suggesting that secondary contact and hybridization may have facilitated expansion. The widespread prevalence of only one of the two detected genetic lineages suggests a primary genetic lineage responsible for on-going population expansion in the US.

Rights

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Data Availability

Article states: "Sampling coordinates are detailed in the Appendix section of Lucardi 2012, available freely here: [http://sun.library.msstate.edu/ETD-db/theses/available/etd-10192012-122638/unrestricted/LUCARDI_Lib_ v2.3_291012.pdf]."

Dissertation matching the year, author, and university is available online at: https://hdl.handle.net/11668/19559

Original Publication Citation

Lucardi, R. D., Wallace, L. E., & Ervin, G. N. (2020). Patterns of genetic diversity in highly invasive species: cogongrass (Imperata cylindrica) expansion in the invaded range of the southern United States (US). Plants, 9(4), 13 pp., Article 423. https://doi.org/10.3390/plants9040423

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