Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.

Recent studies of the routes of worldwide introductions of alien organisms suggest that many widespread invasions could have stemmed not from the native range, but from a particularly successful invasive population, which serves as the source of colonists for remote new territories. We call here thi...

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Autores principales:	Eric Lombaert, Thomas Guillemaud, Jean-Marie Cornuet, Thibaut Malausa, Benoît Facon, Arnaud Estoup
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/de26c6c86af745fabd6107d5bdbbd2ef
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spelling	oai:doaj.org-article:de26c6c86af745fabd6107d5bdbbd2ef2021-11-25T06:25:22ZBridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.1932-620310.1371/journal.pone.0009743https://doaj.org/article/de26c6c86af745fabd6107d5bdbbd2ef2010-03-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20305822/?tool=EBIhttps://doaj.org/toc/1932-6203Recent studies of the routes of worldwide introductions of alien organisms suggest that many widespread invasions could have stemmed not from the native range, but from a particularly successful invasive population, which serves as the source of colonists for remote new territories. We call here this phenomenon the invasive bridgehead effect. Evaluating the likelihood of such a scenario is heuristically challenging. We solved this problem by using approximate Bayesian computation methods to quantitatively compare complex invasion scenarios based on the analysis of population genetics (microsatellite variation) and historical (first observation dates) data. We applied this approach to the Harlequin ladybird Harmonia axyridis (HA), a coccinellid native to Asia that was repeatedly introduced as a biocontrol agent without becoming established for decades. We show that the recent burst of worldwide invasions of HA followed a bridgehead scenario, in which an invasive population in eastern North America acted as the source of the colonists that invaded the European, South American and African continents, with some admixture with a biocontrol strain in Europe. This demonstration of a mechanism of invasion via a bridgehead has important implications both for invasion theory (i.e., a single evolutionary shift in the bridgehead population versus multiple changes in case of introduced populations becoming invasive independently) and for ongoing efforts to manage invasions by alien organisms (i.e., heightened vigilance against invasive bridgeheads).Eric LombaertThomas GuillemaudJean-Marie CornuetThibaut MalausaBenoît FaconArnaud EstoupPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 3, p e9743 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Eric Lombaert Thomas Guillemaud Jean-Marie Cornuet Thibaut Malausa Benoît Facon Arnaud Estoup Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.
description	Recent studies of the routes of worldwide introductions of alien organisms suggest that many widespread invasions could have stemmed not from the native range, but from a particularly successful invasive population, which serves as the source of colonists for remote new territories. We call here this phenomenon the invasive bridgehead effect. Evaluating the likelihood of such a scenario is heuristically challenging. We solved this problem by using approximate Bayesian computation methods to quantitatively compare complex invasion scenarios based on the analysis of population genetics (microsatellite variation) and historical (first observation dates) data. We applied this approach to the Harlequin ladybird Harmonia axyridis (HA), a coccinellid native to Asia that was repeatedly introduced as a biocontrol agent without becoming established for decades. We show that the recent burst of worldwide invasions of HA followed a bridgehead scenario, in which an invasive population in eastern North America acted as the source of the colonists that invaded the European, South American and African continents, with some admixture with a biocontrol strain in Europe. This demonstration of a mechanism of invasion via a bridgehead has important implications both for invasion theory (i.e., a single evolutionary shift in the bridgehead population versus multiple changes in case of introduced populations becoming invasive independently) and for ongoing efforts to manage invasions by alien organisms (i.e., heightened vigilance against invasive bridgeheads).
format	article
author	Eric Lombaert Thomas Guillemaud Jean-Marie Cornuet Thibaut Malausa Benoît Facon Arnaud Estoup
author_facet	Eric Lombaert Thomas Guillemaud Jean-Marie Cornuet Thibaut Malausa Benoît Facon Arnaud Estoup
author_sort	Eric Lombaert
title	Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.
title_short	Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.
title_full	Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.
title_fullStr	Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.
title_full_unstemmed	Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.
title_sort	bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/de26c6c86af745fabd6107d5bdbbd2ef
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Bridgehead effect in the worldwide invasion of the biocontrol harlequin ladybird.

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