Testing an hypothesis of hybrid zone movement for toads in France
(2019) In Molecular Ecology 28(5). p.1070-1083- Abstract
Hybrid zone movement may result in substantial unidirectional introgression of selectively neutral material from the local to the advancing species, leaving a genetic footprint. This genetic footprint is represented by a trail of asymmetric tails and displaced cline centres in the wake of the moving hybrid zone. A peak of admixture linkage disequilibrium is predicted to exist ahead of the centre of the moving hybrid zone. We test these predictions of the movement hypothesis in a hybrid zone between common (Bufo bufo) and spined toads (B. spinosus), using 31 nuclear and one mtDNA SNPs along a transect in the northwest of France. Average effective selection in Bufo hybrids is low and clines vary in shape and centre. A weak pattern of... (More)
Hybrid zone movement may result in substantial unidirectional introgression of selectively neutral material from the local to the advancing species, leaving a genetic footprint. This genetic footprint is represented by a trail of asymmetric tails and displaced cline centres in the wake of the moving hybrid zone. A peak of admixture linkage disequilibrium is predicted to exist ahead of the centre of the moving hybrid zone. We test these predictions of the movement hypothesis in a hybrid zone between common (Bufo bufo) and spined toads (B. spinosus), using 31 nuclear and one mtDNA SNPs along a transect in the northwest of France. Average effective selection in Bufo hybrids is low and clines vary in shape and centre. A weak pattern of asymmetric introgression is inferred from cline discordance of seven nuclear markers. The dominant direction of gene flow is from B. spinosus to B. bufo and is in support of southward movement of the hybrid zone. Conversely, a peak of admixture linkage disequilibrium north of the hybrid zone suggests northward movement. These contrasting results can be explained by reproductive isolation of the B. spinosus and B. bufo gene pools at the southern (B. spinosus) side of the hybrid zone. The joint occurrence of asymmetric introgression and admixture linkage disequilibrium can also be explained by the combination of low dispersal and random genetic drift due to low effective population sizes.
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- author
- van Riemsdijk, Isolde LU ; Butlin, Roger K. ; Wielstra, Ben and Arntzen, Jan W.
- publishing date
- 2019-03
- type
- Contribution to journal
- publication status
- published
- keywords
- admixture linkage disequilibrium, asymmetric reproductive isolation, Bufo bufo, Bufo spinosus, cline coupling, hybrid zone movement
- in
- Molecular Ecology
- volume
- 28
- issue
- 5
- pages
- 14 pages
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:30609055
- scopus:85063687723
- ISSN
- 0962-1083
- DOI
- 10.1111/mec.15005
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2019 John Wiley & Sons Ltd
- id
- 61c3a763-719a-4497-b1c5-96d620c0bf04
- date added to LUP
- 2024-08-15 10:18:23
- date last changed
- 2024-08-20 17:18:25
@article{61c3a763-719a-4497-b1c5-96d620c0bf04,
abstract = {{<p>Hybrid zone movement may result in substantial unidirectional introgression of selectively neutral material from the local to the advancing species, leaving a genetic footprint. This genetic footprint is represented by a trail of asymmetric tails and displaced cline centres in the wake of the moving hybrid zone. A peak of admixture linkage disequilibrium is predicted to exist ahead of the centre of the moving hybrid zone. We test these predictions of the movement hypothesis in a hybrid zone between common (Bufo bufo) and spined toads (B. spinosus), using 31 nuclear and one mtDNA SNPs along a transect in the northwest of France. Average effective selection in Bufo hybrids is low and clines vary in shape and centre. A weak pattern of asymmetric introgression is inferred from cline discordance of seven nuclear markers. The dominant direction of gene flow is from B. spinosus to B. bufo and is in support of southward movement of the hybrid zone. Conversely, a peak of admixture linkage disequilibrium north of the hybrid zone suggests northward movement. These contrasting results can be explained by reproductive isolation of the B. spinosus and B. bufo gene pools at the southern (B. spinosus) side of the hybrid zone. The joint occurrence of asymmetric introgression and admixture linkage disequilibrium can also be explained by the combination of low dispersal and random genetic drift due to low effective population sizes.</p>}},
author = {{van Riemsdijk, Isolde and Butlin, Roger K. and Wielstra, Ben and Arntzen, Jan W.}},
issn = {{0962-1083}},
keywords = {{admixture linkage disequilibrium; asymmetric reproductive isolation; Bufo bufo; Bufo spinosus; cline coupling; hybrid zone movement}},
language = {{eng}},
number = {{5}},
pages = {{1070--1083}},
publisher = {{Wiley-Blackwell}},
series = {{Molecular Ecology}},
title = {{Testing an hypothesis of hybrid zone movement for toads in France}},
url = {{http://dx.doi.org/10.1111/mec.15005}},
doi = {{10.1111/mec.15005}},
volume = {{28}},
year = {{2019}},
}