The Maintenance of Reproductive Isolation in a Mosaic Hybrid Zone Between the Fire-Bellied Toads Bombina Bombina and B. Variegata

Vines, Tim; Köhler, S.; Thiel, M.; Ghira, Ioan; Sands, T. R.; MacCallum, Catriona; Barton, Nick; Nürnberger, Beate

doi:10.1554/02-512

Cited by 39 publications

(67 citation statements)

References 38 publications

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“…However, patchy or mosaic distributions are in fact commonplace, and often occur in ecologically complex or montane regions involving a third dimension. A few have been well described and studied (eg Harrison and Rand 1989;Howard et al 1993;Bridle et al 2001;Britch et al 2001;Ross and Harrison 2002;Moore and Price 1993;Vines et al 2003;Bridle et al 2006;Yanchukov et al 2006;Ross et al 2008). While some simple 2-dimensional models were attempted (Nichols 1989;Nichols and Hewitt 1994), the functioning of some of these more complex situations might profitably be approached using modern computer simulation.…”

Section: Four Dimensions Of Hybrid Zonesmentioning

confidence: 99%

Quaternary phylogeography: the roots of hybrid zones

Hewitt¹

2011

Genetica

352

336

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The older history of hybrid zones is explored through consideration of recent advances in climatology, paleontology and phylogeography in the Late Cenozoic, particularly the Quaternary Period with its major climatic cycles. The fossil record shows that these ice ages and their nested millennial oscillations caused substantial changes in species distributions and with genetic evidence allows deduction of refugia and colonization routes in arctic, temperate, desert and tropical regions. The age of divergence between hybridizing lineages varies from the Late Pleistocene to the Late Miocene, implying much range change and varying selection on sister lineages. Hybridizing lineages in the Tropical and Temperate regions range in age from young to old, but those studied in the Arctic are no more than a few ice ages old and their refugial roots are not clear. Mid to low latitude regions often show parapatric patchworks of lineages and multiple refugia stable through many climatic oscillations. Particular hybrid zones may have formed more than once; while some expansions were not the same, producing reticulation and introgression in previous glacial cycles. Hybrid-zone roots are complex and deep, and considerations of their complexity can reveal evolutionary pathways of species. They are indeed windows on evolution.

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Section: Four Dimensions Of Hybrid Zonesmentioning

confidence: 99%

Quaternary phylogeography: the roots of hybrid zones

Hewitt¹

2011

Genetica

352

336

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“…The mosaic pattern of the Bluewinged/Golden-winged system has several implications. First, it is not surprising that patterns of introgression will differ across sites that themselves differ in their habitat landscape and in the relative population sizes of parental and hybrid individuals, as similarly diverse hybridization dynamics have been documented across a number of other mosaic hybrid zones (e.g., Ross and Harrison 2002;Vines et al 2003). Second, genetic swamping may proceed more rapidly in mosaic zones than in tension situations where selection maintains a narrow hybrid zones separating large, geographically separated parental populations.…”

Section: Evidence Against Unidirectional Introgressionmentioning

confidence: 99%

Geographic variability in mitochondrial introgression among hybridizing populations of Golden-winged (Vermivora chrysoptera) and Blue-winged (V.opinus) Warblers

et al. 2005

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The rapidly declining Golden-winged Warbler (Vermivora chrysoptera) is of conservation concern owing in part to hybridization with the closely related Blue-winged Warbler (V. pinus). These species hybridize extensively in eastern North America and over the past century the Blue-winged Warbler has displaced the Golden-winged Warbler from substantial regions of its historic breeding range. A previous study suggested that these genetic interactions result in rapid and asymmetric introgression of Blue-winged Warbler mitochondrial DNA (mtDNA) into Golden-winged phenotype populations within the zones of contact, but more recent and extensive surveys have documented a more complex pattern of genetic interchange between these taxa. We surveyed mtDNA/phenotype associations in 104 individuals of known phenotype drawn from two locations with different histories of contact and found substantial variation between sites in the extent of introgression. Where both species have co-existed for more than a century, we found evidence of bi-directional introgression and the long-term persistence of Golden-winged mtDNA haplotypes. At the leading edge of the northward expansion of Blue-winged Warblers, we found predominantly Golden-winged Warbler mtDNA haplotypes in both Golden-winged and hybrid-phenotype individuals. Across both sites, genetic swamping does not appear to be occurring via the early immigration of Blue-winged Warbler females into populations dominated by Golden-winged Warbler phenotypes. Instead, the differing patterns of mitochondrial introgression may be driven by the relative local population sizes of the parental species coupled with subtle between-species differences in mate choice and habitat preferences.

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“…Complex variation among parts of the genome in their propensity for admixture and recombination in hybrid populations has been illustrated in a few groups such as the sunflower genus, Helianthus, (Rieseberg et al 1999b(Rieseberg et al , 2000, Drosophila (True et al 1996), and Anopheles mosquitoes (Garcia et al 1996;della Torre et al 2002). In other systems, hybrid zones exhibit remarkable concordance across traits and loci (Nü rnburger et al 1995;Dasmahapatra et al 2002;Vines et al 2003). Ultimately, the key question remains whether discrete species represent completely isolated and integrated coadapted gene complexes as proposed during the modern evolutionary synthesis (Dobzhansky 1937;Mayr 1963) or whether ecological and other phenotypic discontinuities typical of ''good species'' are maintained by a small set of genetic factors whereas the bulk of the genome is free to introgress across species boundaries (Barton and Hewitt 1985;Harrison 1990; Rieseberg and Burke 2001; Rundle et al 2001;Schilthuizen 2001;Wu 2001).…”

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confidence: 99%

Environment-Dependent Admixture Dynamics in a Tiger Salamander Hybrid Zone

Fitzpatrick

Shaffer

2004

Evolution

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After an estimated five million years of independent evolution, the barred tiger salamander (Ambystoma tigrinum mavortium) was introduced by bait dealers into the native range of the California tiger salamander (A. californiense). Hybridization and backcrossing have been occurring in central California for 50-60 years, or an estimated 15-30 generations. We studied genetic and ecological factors influencing admixture of these two divergent gene pools by analyzing frequencies of hybrid genotypes in three kinds of breeding habitats: natural vernal pools, ephemeral man-made cattle ponds, and perennial man-made ponds. Perennial ponds tended to have higher frequencies of nonnative alleles than either type of seasonal pond, even in cases where perennial and seasonal ponds are within a few hundred meters. Thus, the hybrid zone has a mosaic structure that depends on pond hydrology or ecology. The presence of some broadly acting constraints on admixture is suggested by linkage disequilibria between physically unlinked molecular markers within ponds. In addition, we found several marker-specific deviations from Hardy-Weinberg equilibrium. One marker showed a consistent deficit of heterozygotes across pond types. Another showed heterozygote deficits only in vernal pools. A third was more likely to have heterozygote excess in ephemeral cattle ponds. These patterns indicate that admixture is influenced by complex genotype-by-environment interactions.

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The Maintenance of Reproductive Isolation in a Mosaic Hybrid Zone Between the Fire-Bellied Toads Bombina Bombina and B. Variegata

Cited by 39 publications

References 38 publications

Quaternary phylogeography: the roots of hybrid zones

Quaternary phylogeography: the roots of hybrid zones

Geographic variability in mitochondrial introgression among hybridizing populations of Golden-winged (Vermivora chrysoptera) and Blue-winged (V.opinus) Warblers

Environment-Dependent Admixture Dynamics in a Tiger Salamander Hybrid Zone

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