Understanding the onset of hybrid speciation

Nolte, Arne W.; Tautz, Diethard

doi:10.1016/j.tig.2009.12.001

Cited by 213 publications

(242 citation statements)

References 42 publications

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“…The great ecological divergence between the hybridizing species (flood plain vs. upland habitats) is also in line with expectations for conditions prevailing at the onset of hybrid speciation (Buerkle et al 2000;Nolte and Tautz 2010). Nevertheless, opportunities for interspecific gene flow still exist (Figures 1 and 3), and interspecific heterozygosities in hybrids are higher than expected, based on models of recombinational speciation (Buerkle et al 2000); note that drift in isolated hybrid lineages tends to reduce interspecific heterozygosity.…”

Section: Resultssupporting

confidence: 81%

Genomic Admixture Analysis in European Populus spp. Reveals Unexpected Patterns of Reproductive Isolation and Mating

et al. 2010

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Admixture between genetically divergent populations facilitates genomic studies of the mechanisms involved in adaptation, reproductive isolation, and speciation, including mapping of the loci involved in these phenomena. Little is known about how pre-and postzygotic barriers will affect the prospects of ''admixture mapping'' in wild species. We have studied 93 mapped genetic markers (microsatellites, indels, and sequence polymorphisms, $60,000 data points) to address this topic in hybrid zones of Populus alba and P. tremula, two widespread, ecologically important forest trees. Using genotype and linkage information and recently developed analytical tools we show that (1) reproductive isolation between these species is much stronger than previously assumed but this cannot prevent the introgression of neutral or advantageous alleles, (2) unexpected genotypic gaps exist between recombinant hybrids and their parental taxa, (3) these conspicuous genotypic patterns are due to assortative mating and strong postzygotic barriers, rather than recent population history. We discuss possible evolutionary trajectories of hybrid lineages between these species and outline strategies for admixture mapping in hybrid zones between highly divergent populations. Datasets such as this one are still rare in studies of natural hybrid zones but should soon become more common as high throughput genotyping and resequencing become feasible in nonmodel species.

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Section: Resultssupporting

confidence: 81%

Genomic Admixture Analysis in European Populus spp. Reveals Unexpected Patterns of Reproductive Isolation and Mating

et al. 2010

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“…Alternatively, introgressive hybridization results, if hybrid offspring survive, are fertile, and contribute their alleles to future generations. Although introgressive hybridization can lead to a number of outcomes, such as the creation of new species (e.g., Nolte and Tautz 2010), the development of hybrid zones is more common. These hybrid zones often take the form of tension zones composed of parental forms and less‐fit hybrids, or of zones of bounded hybrid superiority in which hybrids are locally more fit than either parent.…”

Section: Introductionmentioning

confidence: 99%

Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams

McKelvey

Young

Wilcox

et al. 2016

Ecology and Evolution

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Introgressive hybridization between native and introduced species is a growing conservation concern. For native cutthroat trout and introduced rainbow trout in western North America, this process is thought to lead to the formation of hybrid swarms and the loss of monophyletic evolutionary lineages. Previous studies of this phenomenon, however, indicated that hybrid swarms were rare except when native and introduced forms of cutthroat trout co‐occurred. We used a panel of 86 diagnostic, single nucleotide polymorphisms to evaluate the genetic composition of 3865 fish captured in 188 locations on 129 streams distributed across western Montana and northern Idaho. Although introgression was common and only 37% of the sites were occupied solely by parental westslope cutthroat trout, levels of hybridization were generally low. Of the 188 sites sampled, 73% contained ≤5% rainbow trout alleles and 58% had ≤1% rainbow trout alleles. Overall, 72% of specimens were nonadmixed westslope cutthroat trout, and an additional 3.5% were nonadmixed rainbow trout. Samples from seven sites met our criteria for hybrid swarms, that is, an absence of nonadmixed individuals and a random distribution of alleles within the sample; most (6/7) were associated with introgression by Yellowstone cutthroat trout. In streams with multiple sites, upstream locations exhibited less introgression than downstream locations. We conclude that although the widespread introduction of nonnative trout within the historical range of westslope cutthroat trout has increased the incidence of introgression, sites containing nonadmixed populations of this taxon are common and broadly distributed.

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“…such pathways rarely proceed in a linear fashion by divergence alone, as repeated intermezzos of gene flow perturbate gene pools and set the stage for selection, drift, and speciation (King & Lawson, 1995;Rossiter, 1995;Pinho & Hey, 2010;. On the long run, secondary admixis can either render population distinctness or produce novel and distinct hybrid entities, which can evolve to novel species (Seehausen, 2004;Nolte & Tautz, 2010).…”

Section: Introductionmentioning

confidence: 99%

A separate lowstand lake at the northern edge of Lake Tanganyika? Evidence from phylogeographic patterns in the cichlid genus Tropheus

et al. 2016

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In Lake Tanganyika, lake level fluctuations were shown to have had a major impact on the evolution of littoral species. Many species are subdivided into arrays of populations, geographical races and sister species, each colonizing a particular section of the shore. Their often limited dispersal abilities promoted geographic isolation and, on the long run, allopatric speciation. With more than 120 distinct populations, the genus Tropheus represents the most spectacular and best-studied example of this phenomenon. The present study aims at the fine-scale reconstruction of the spread of two mitochondrial Tropheus-lineages in the very north of the lake, where two species, T. sp. 'black' and T. brichardi, occur. Using mtDNA sequences and AFLP-data, we analyzed samples from 21 localities and found a highly complex conglomerate of introgressed populations formed by the repeated contact of two lineages. Our data suggest repeated cross-lake dispersal of T. sp. 'black' haplotypes along the ridge between the West and East Ubwari Fault, supporting an additional persisting lowstand-lake in the Bujumbura subbasin at the very north of the lake and highlighting once more the impact of lake level fluctuations on the genetic structure and evolution of stenotopic rockdwelling cichlid species.

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Understanding the onset of hybrid speciation

Cited by 213 publications

References 42 publications

Genomic Admixture Analysis in European Populus spp. Reveals Unexpected Patterns of Reproductive Isolation and Mating

Genomic Admixture Analysis in European Populus spp. Reveals Unexpected Patterns of Reproductive Isolation and Mating

Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams

A separate lowstand lake at the northern edge of Lake Tanganyika? Evidence from phylogeographic patterns in the cichlid genus Tropheus

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