Tracing species replacement in Iberian marbled newts
(2021) In Ecology and Evolution 11(1). p.402-414- Abstract
Secondary contact between closely related species can lead to the formation of hybrid zones, allowing for interspecific gene flow. Hybrid zone movement can take place if one of the species possesses a competitive advantage over the other, ultimately resulting in species replacement. Such hybrid zone displacement is predicted to leave a genomic footprint across the landscape in the form of asymmetric gene flow (or introgression) of selectively neutral alleles from the displaced to the advancing species. Hybrid zone movement has been suggested for marbled newts in the Iberian Peninsula, supported by asymmetric gene flow and a distribution relict (i.e., an enclave) of Triturus marmoratus in the range of T. pygmaeus. We developed a panel of... (More)
Secondary contact between closely related species can lead to the formation of hybrid zones, allowing for interspecific gene flow. Hybrid zone movement can take place if one of the species possesses a competitive advantage over the other, ultimately resulting in species replacement. Such hybrid zone displacement is predicted to leave a genomic footprint across the landscape in the form of asymmetric gene flow (or introgression) of selectively neutral alleles from the displaced to the advancing species. Hybrid zone movement has been suggested for marbled newts in the Iberian Peninsula, supported by asymmetric gene flow and a distribution relict (i.e., an enclave) of Triturus marmoratus in the range of T. pygmaeus. We developed a panel of nuclear and mitochondrial SNP markers to test for the presence of a T. marmoratus genomic footprint in the Lisbon peninsula, south of the enclave. We found no additional populations of T. marmoratus. Analysis with the software Structure showed no genetic traces of T. marmoratus in T. pygmaeus. A principal component analysis showed some variation within the local T. pygmaeus, but it is unclear if this represents introgression from T. marmoratus. The results may be explained by (a) species replacement without introgressive hybridization and (b) displacement with hybridization followed by the near-complete erosion of the footprint by purifying selection. We predict that testing for a genomic footprint north of the reported enclave would confirm that species replacement in these marbled newts occurred with hybridization.
(Less)
- author
- López-Delgado, Julia ; van Riemsdijk, Isolde LU and Arntzen, Jan W.
- publishing date
- 2021-01
- type
- Contribution to journal
- publication status
- published
- keywords
- amphibians, enclave, hybridization, introgression, secondary contact, Triturus
- in
- Ecology and Evolution
- volume
- 11
- issue
- 1
- pages
- 13 pages
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85097543006
- ISSN
- 2045-7758
- DOI
- 10.1002/ece3.7060
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
- id
- c768ecc4-7052-4f74-8f64-136e1a656218
- date added to LUP
- 2024-08-15 10:26:20
- date last changed
- 2024-08-21 14:16:31
@article{c768ecc4-7052-4f74-8f64-136e1a656218,
abstract = {{<p>Secondary contact between closely related species can lead to the formation of hybrid zones, allowing for interspecific gene flow. Hybrid zone movement can take place if one of the species possesses a competitive advantage over the other, ultimately resulting in species replacement. Such hybrid zone displacement is predicted to leave a genomic footprint across the landscape in the form of asymmetric gene flow (or introgression) of selectively neutral alleles from the displaced to the advancing species. Hybrid zone movement has been suggested for marbled newts in the Iberian Peninsula, supported by asymmetric gene flow and a distribution relict (i.e., an enclave) of Triturus marmoratus in the range of T. pygmaeus. We developed a panel of nuclear and mitochondrial SNP markers to test for the presence of a T. marmoratus genomic footprint in the Lisbon peninsula, south of the enclave. We found no additional populations of T. marmoratus. Analysis with the software Structure showed no genetic traces of T. marmoratus in T. pygmaeus. A principal component analysis showed some variation within the local T. pygmaeus, but it is unclear if this represents introgression from T. marmoratus. The results may be explained by (a) species replacement without introgressive hybridization and (b) displacement with hybridization followed by the near-complete erosion of the footprint by purifying selection. We predict that testing for a genomic footprint north of the reported enclave would confirm that species replacement in these marbled newts occurred with hybridization.</p>}},
author = {{López-Delgado, Julia and van Riemsdijk, Isolde and Arntzen, Jan W.}},
issn = {{2045-7758}},
keywords = {{amphibians; enclave; hybridization; introgression; secondary contact; Triturus}},
language = {{eng}},
number = {{1}},
pages = {{402--414}},
publisher = {{Wiley-Blackwell}},
series = {{Ecology and Evolution}},
title = {{Tracing species replacement in Iberian marbled newts}},
url = {{http://dx.doi.org/10.1002/ece3.7060}},
doi = {{10.1002/ece3.7060}},
volume = {{11}},
year = {{2021}},
}