The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass

Genevieve Diedericks; Romina Henriques; Sophie von der Heyden; Olaf L. F. Weyl; Cang Hui

doi:10.1111/eva.12652

journal article Open Access Jun 25, 2018

The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass

Genevieve Diedericks

Romina Henriques Sophie von der Heyden Olaf L. F. Weyl

Cang Hui

Evolutionary Applications Vol. 11 No. 9 pp. 1609-1629 · Wiley

View at Publisher Save 10.1111/eva.12652

Abstract

AbstractUnderstanding the demographic history of introduced populations is essential for unravelling their invasive potential and adaptability to a novel environment. To this end, levels of genetic diversity within the native and invasive range of a species are often compared. Most studies, however, focus solely on contemporary samples, relying heavily on the premise that the historic population structure within the native range has been maintained over time. Here, we assess this assumption by conducting a three‐way comparison of the genetic diversity of native (historic and contemporary) and invasive (contemporary) smallmouth bass (Micropterus dolomieu) populations. Analyses of a total of 572 M. dolomieu samples, representing the contemporary invasive South African range, contemporary and historical native USA range (dating back to the 1930s when these fish were first introduced into South Africa), revealed that the historical native range had higher genetic diversity levels when compared to both contemporary native and invasive ranges. These results suggest that both contemporary populations experienced a recent genetic bottleneck. Furthermore, the invasive range displayed significant population structure, whereas both historical and contemporary native US populations revealed higher levels of admixture. Comparison of contemporary and historical samples showed both a historic introduction of M. dolomieu and a more recent introduction, thereby demonstrating that undocumented introductions of this species have occurred. Although multiple introductions might have contributed to the high levels of genetic diversity in the invaded range, we discuss alternative factors that may have been responsible for the elevated levels of genetic diversity and highlight the importance of incorporating historic specimens into demographic analyses.

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References

Details

Published: Jun 25, 2018
Vol/Issue: 11(9)
Pages: 1609-1629
License: View

Authors

G

Genevieve Diedericks

Centre for Invasion Biology Department of Botany and Zoology Stellenbosch University Matieland Stellenbosch South Africa; Evolutionary Genomics Group Department of Botany and Zoology Stellenbosch University Matieland Stellenbosch South Africa

R

Romina Henriques

Section for Marine Living Resources National Institute of Aquatic Resources Technical University of Denmark Lyngby Denmark

S

Sophie von der Heyden

Evolutionary Genomics Group Department of Botany and Zoology Stellenbosch University Matieland Stellenbosch South Africa

O

Olaf L. F. Weyl

DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology South African Institute for Aquatic Biodiversity (SAIAB) Grahamstown South Africa; Centre for Invasion Biology South African Institute for Aquatic Biodiversity (SAIAB) Grahamstown South Africa

C

Cang Hui

Centre for Invasion Biology Department of Mathematical Sciences Stellenbosch University Matieland Stellenbosch South Africa; Mathematical Biosciences Group African Institute for Mathematical Sciences Cape Town South Africa

Funding

Department of Science and Technology, Republic of South Africa Award: 109015

South African Agency for Science and Technology Advancement Award: 109244

Cite This Article

Genevieve Diedericks, Romina Henriques, Sophie von der Heyden, et al. (2018). The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass. Evolutionary Applications, 11(9), 1609-1629. https://doi.org/10.1111/eva.12652

The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass

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