---
_id: '33'
abstract:
- lang: eng
text: Secondary contact is the reestablishment of gene flow between sister populations
that have diverged. For instance, at the end of the Quaternary glaciations in
Europe, secondary contact occurred during the northward expansion of the populations
which had found refugia in the southern peninsulas. With the advent of multi-locus
markers, secondary contact can be investigated using various molecular signatures
including gradients of allele frequency, admixture clines, and local increase
of genetic differentiation. We use coalescent simulations to investigate if molecular
data provide enough information to distinguish between secondary contact following
range expansion and an alternative evolutionary scenario consisting of a barrier
to gene flow in an isolation-by-distance model. We find that an excess of linkage
disequilibrium and of genetic diversity at the suture zone is a unique signature
of secondary contact. We also find that the directionality index ψ, which was
proposed to study range expansion, is informative to distinguish between the two
hypotheses. However, although evidence for secondary contact is usually conveyed
by statistics related to admixture coefficients, we find that they can be confounded
by isolation-by-distance. We recommend to account for the spatial repartition
of individuals when investigating secondary contact in order to better reflect
the complex spatio-temporal evolution of populations and species.
acknowledgement: 'Johanna Bertl was supported by the Vienna Graduate School of Population
Genetics (Austrian Science Fund (FWF): W1225-B20) and worked on this project while
employed at the Department of Statistics and Operations Research, University of
Vienna, Austria. This article was developed in the framework of the Grenoble Alpes
Data Institute, which is supported by the French National Research Agency under
the “Investissments d’avenir” program (ANR-15-IDEX-02).'
article_number: e5325
article_processing_charge: No
author:
- first_name: Johanna
full_name: Bertl, Johanna
last_name: Bertl
- first_name: Harald
full_name: Ringbauer, Harald
id: 417FCFF4-F248-11E8-B48F-1D18A9856A87
last_name: Ringbauer
orcid: 0000-0002-4884-9682
- first_name: Michaël
full_name: Blum, Michaël
last_name: Blum
citation:
ama: Bertl J, Ringbauer H, Blum M. Can secondary contact following range expansion
be distinguished from barriers to gene flow? PeerJ. 2018;2018(10). doi:10.7717/peerj.5325
apa: Bertl, J., Ringbauer, H., & Blum, M. (2018). Can secondary contact following
range expansion be distinguished from barriers to gene flow? PeerJ. PeerJ.
https://doi.org/10.7717/peerj.5325
chicago: Bertl, Johanna, Harald Ringbauer, and Michaël Blum. “Can Secondary Contact
Following Range Expansion Be Distinguished from Barriers to Gene Flow?” PeerJ.
PeerJ, 2018. https://doi.org/10.7717/peerj.5325.
ieee: J. Bertl, H. Ringbauer, and M. Blum, “Can secondary contact following range
expansion be distinguished from barriers to gene flow?,” PeerJ, vol. 2018,
no. 10. PeerJ, 2018.
ista: Bertl J, Ringbauer H, Blum M. 2018. Can secondary contact following range
expansion be distinguished from barriers to gene flow? PeerJ. 2018(10), e5325.
mla: Bertl, Johanna, et al. “Can Secondary Contact Following Range Expansion Be
Distinguished from Barriers to Gene Flow?” PeerJ, vol. 2018, no. 10, e5325,
PeerJ, 2018, doi:10.7717/peerj.5325.
short: J. Bertl, H. Ringbauer, M. Blum, PeerJ 2018 (2018).
date_created: 2018-12-11T11:44:16Z
date_published: 2018-10-01T00:00:00Z
date_updated: 2023-10-17T12:24:43Z
day: '01'
ddc:
- '576'
department:
- _id: NiBa
doi: 10.7717/peerj.5325
external_id:
isi:
- '000447204400001'
pmid:
- '30294507'
file:
- access_level: open_access
checksum: 3334886c4b39678db4c4b74299ca14ba
content_type: application/pdf
creator: dernst
date_created: 2018-12-17T10:46:06Z
date_updated: 2020-07-14T12:46:06Z
file_id: '5692'
file_name: 2018_PeerJ_Bertl.pdf
file_size: 1328344
relation: main_file
file_date_updated: 2020-07-14T12:46:06Z
has_accepted_license: '1'
intvolume: ' 2018'
isi: 1
issue: '10'
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
pmid: 1
publication: PeerJ
publication_status: published
publisher: PeerJ
publist_id: '8022'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Can secondary contact following range expansion be distinguished from barriers
to gene flow?
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 2018
year: '2018'
...