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

G. Diedericks*, Romina Henriques, S. von der Heyden, O.L.F. Weyl, C. Hui

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

424 Downloads (Pure)

Abstract

Understanding 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.
Original languageEnglish
JournalEvolutionary Applications
Volume11
Issue number9
Pages (from-to)1609-1629
ISSN1752-4563
DOIs
Publication statusPublished - 2018

Cite this

Diedericks, G. ; Henriques, Romina ; von der Heyden, S. ; Weyl, O.L.F. ; Hui, C. / The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass. In: Evolutionary Applications. 2018 ; Vol. 11, No. 9. pp. 1609-1629.
@article{047c44485a6a4294ae63f256ccf1cc8e,
title = "The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass",
abstract = "Understanding 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.",
author = "G. Diedericks and Romina Henriques and {von der Heyden}, S. and O.L.F. Weyl and C. Hui",
year = "2018",
doi = "10.1111/eva.12652",
language = "English",
volume = "11",
pages = "1609--1629",
journal = "Evolutionary Applications (Online)",
issn = "1752-4563",
publisher = "Wiley-Blackwell",
number = "9",

}

The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass. / Diedericks, G.; Henriques, Romina; von der Heyden, S.; Weyl, O.L.F.; Hui, C.

In: Evolutionary Applications, Vol. 11, No. 9, 2018, p. 1609-1629.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The ghost of introduction past: Spatial and temporal variability in the genetic diversity of invasive smallmouth bass

AU - Diedericks, G.

AU - Henriques, Romina

AU - von der Heyden, S.

AU - Weyl, O.L.F.

AU - Hui, C.

PY - 2018

Y1 - 2018

N2 - Understanding 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.

AB - Understanding 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.

U2 - 10.1111/eva.12652

DO - 10.1111/eva.12652

M3 - Journal article

C2 - 30344631

VL - 11

SP - 1609

EP - 1629

JO - Evolutionary Applications (Online)

JF - Evolutionary Applications (Online)

SN - 1752-4563

IS - 9

ER -