Empirical study of hybrid zone movement

Buggs, Richard J. A.

doi:10.1038/sj.hdy.6800997

Cited by 306 publications

(421 citation statements)

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“…The typical population genetic approach is to analyse the patterns of markers in hybrid zones, which are dynamic sites where species interact and cross-hybridize (Barton and Hewitt, 1985;Arnold, 1992;Buggs, 2007), and compare them to reference populations of individuals away from these zones (Rieseberg and Carney, 1998;Pinheiro et al, 2010). The genomic contribution of the parental lineages in each hybrid individual can then be estimated (the 'hybrid index' or 'admixture proportion'; maximum likelihood implementation in HINDEX; Buerkle, 2005) as well as the hybrid class (for example, F1, F1 backcross, model-based Bayesian implementation in NEWHYBRIDS; Anderson and Thompson, 2002).…”

Section: Population Genetic Approachmentioning

confidence: 99%

“…By expanding the study range, replicate hybrid swarms can be included, as patterns of hybridization may not be the same under different environmental and demographic scenarios . Moreover, recent theoretical and empirical data (summarized in Buggs, 2007) highlight that hybrid zones may not be static in space and time (Barton and Hewitt, 1985). Increased sample ranges will allow a better understanding of the dynamic nature of past Next-generation hybridization and introgression AD Twyford and RA Ennos hybridization events, and also influence future conservation policies of taxa that are known to hybridize.…”

Section: How Can Ngs Best Be Used To Study Hybridization and Introgrementioning

confidence: 99%

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Next-generation hybridization and introgression

2011

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Hybridization has a major role in evolution-from the introgression of important phenotypic traits between species, to the creation of new species through hybrid speciation. Molecular studies of hybridization aim to understand the class of hybrids and the frequency of introgression, detect the signature of ancient hybridization, and understand the behaviour of introgressed loci in their new genomic background. This often involves a large investment in the design and application of molecular markers, leading to a compromise between the depth and breadth of genomic data. New techniques designed to assay a large sub-section of the genome, in association with next-generation sequencing (NGS) technologies, will allow genome-wide hybridization and introgression studies in organisms with no prior sequence data. These detailed genotypic data will unite the breadth of sampling of loci characteristic of population genetics with the depth of sequence information associated with molecular phylogenetics. In this review, we assess the theoretical and methodological constraints that limit our understanding of natural hybridization, and promote the use of NGS for detecting hybridization and introgression between non-model organisms. We also make recommendations for the ways in which emerging techniques, such as pooled barcoded amplicon sequencing and restriction site-associated DNA tags, should be used to overcome current limitations, and enhance our understanding of this evolutionary significant process. Heredity (2012) 108, 179-189; doi:10.1038/hdy.2011.68; published online 7 September 2011Keywords: next-generation sequencing; hybridization; introgression; reticulate evolution; single-nucleotide polymorphisms (SNPs); restriction site-associated DNA (RAD) tags INTRODUCTION Hybridization, the crossbreeding between individuals of different species, and introgression, the transfer of genes between species mediated primarily by backcrossing, have been the focus of evolutionary studies over many decades (see Anderson, 1949;Arnold, 1992;Rieseberg and Carney, 1998). Hybridization is potentially a creative evolutionary process, allowing genetic novelties to accumulate faster than through mutation alone (Anderson and Hubricht, 1938;Martinsen et al., 2001). This may increase allelic variation at selectively neutral loci, and transfer adaptively important genetic variation, which may increase the fitness of the introgressed lineage (Choler et al., 2004;Martin et al., 2006;Castric et al., 2008;Kim et al., 2008). Moreover, hybridization can have a role in speciation. Hybridization in association with whole-genome duplication (polyploidy) is considered a likely route to speciation, particularly in plants ( Hegarty and Hiscock, 2008). The difference in ploidy levels between the polyploid hybrid and diploid progenitors acts as a strong reproductive barrier (Soltis et al., 2004), although there are examples of introgression across ploidy levels (for example, Senecio; Chapman and Abbott, 2010). Hybrid speciation can also occur without a change i...

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Section: Population Genetic Approachmentioning

confidence: 99%

Section: How Can Ngs Best Be Used To Study Hybridization and Introgrementioning

confidence: 99%

Next-generation hybridization and introgression

2011

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“…In Drosophila, which has a worldwide distribution, significant morphometric wing variations were found in populations from different geographic regions, forming clusters or latitudinal clines ( Van'T Land et al 1999). Some studies report that variations in the wings may be related to intrapopulation genetic variations, life history [such as conditions during larval development (Swindell & Bouzat 2006)], the direction of selection throughout the population sources (Hansen & Houle 2008) and the fitness or possible targets of natural selection (Buggs 2007, Gay et al 2008. Other studies have related morphological differences to species divergence or ecological adaptations (James et al 1997).…”

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confidence: 99%

Genetic-morphometric variation in Culex quinquefasciatus from Brazil and La Plata, Argentina

Morais

Moratore

Suesdek

et al. 2010

Mem. Inst. Oswaldo Cruz

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Variation among natural populations of Culex (Culex) Key words: Culex pipiens complex -Culex quinquefasciatus -clines -molecular identification -wing morphologyThe Culex (Culex) pipiens complex in the Americas is composed of two main species, Culex (Culex) quinquefasciatus Say, which is adapted to tropical zones and Cx. pipiens L., which is found in temperate zones. In intermediate areas, these two members can mate yielding hybrids and intermediate forms (Barr 1957), through the processes of gene flow and introgression (Humeres et al. 1998, McAbee et al. 2008, Kothera et al. 2009). Mosquitoes of the Cx. pipiens complex are potential vectors of filarid worms in tropical and subtropical areas (Bockarie et al. 2009) and diverse arboviruses, including West Nile virus (Apperson et al. 2004, Cook et al. 2006.Adult females and immature stages of the Cx. pipiens complex are morphologically similar. The differentiation of adult males can be made by analysis of genitalia, which includes measuring the DV/D ratio of the dorsal arms of the aedeagus in the phallosome, as reported by Sundararaman (1949). Because members of the Cx. pipiens complex have a broad geographical distribution, other phenotypical differences beyond those of the male genitalia can be found. For example, some wing characters can also been used for morphologic identification of mosquito species.Financial support: FAPESP (05/50225-2, 06/02622-5) SAM and CM contributed equally to this work (FAPESP 06/57272-9 and 07/1665-5, respectively The taxonomic keys compiled by Forattini (2002) compared wing morphology of adult females. In that report, the subcosta vein (Sc) was reported to bind with the costa vein (C) before the bifurcation of the radial 2+3 vein (R 2+3 ) in Cx. quinquefasciatus, whereas in Cx. pipiens, the Sc vein binds to vein C at the same point or beyond the R 2+3 bifurcation. To our knowledge, these findings have not been investigated in other geographically distant populations. Linam and Nielsen (1962) reported that Bekku (1956), in Northern Japan, also attempted to use wing characteristics [the length of radial cell R 2 (second marginal cell) divided by the length of vein R 3 ] to distinguish adults of the pipiens group. The results of Bekku (1956) were inconclusive, which was later explained when Kamura (1958) found that these particular wing measurements varied with the temperature of the environment. Nielsen and Rees (1961) and Linam and Nielsen (1962) reported that the most reliable method of separating females of Cx. pipiens and Cx. quinquefasciatus was by a wing measurement value obtained by dividing the length of the cell R 2 by the length of the vein R 2+3 (R 2 /R 2+3 ratio). These authors reported the value of this ratio to be about 5.0 in Cx. pipiens and 3.0 or less in Cx. quinquefasciatus, with intermediate values present in the hybrids. However, these studies did not evaluate morphometric data among mosquito populations and climatic/geographic gradients.In insects, the phenotypic variations among members of species complexes have...

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“…2; Ishikawa and Kubota 1994, 1995). This geographic pattern of distributional boundaries is assumed to be a footprint of past hybrid zone movement (Buggs 2007); the wide southern range of C. maiyasanus in the past was invaded by C. iwawakianus populations that moved northward. During the range expansion, the two species presumably interacted with each other and with external environments.…”

Section: Introductionmentioning

confidence: 99%

Ecological differentiation and habitat unsuitability maintaining a ground beetle hybrid zone

Yasuda

Osawa

2015

Ecology and Evolution

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Exogenous selection via interactions between organisms and environments may influence the dynamics of hybrid zones between species in multiple ways. Two major models of a hybrid zone allowed us to hypothesize that environmental conditions influence hybrid zone dynamics in two ways. In the first model, an environmental gradient determines the mosaic distribution at the boundary between ecologically differentiated species (mosaic hybrid zone model). In the second model, a patch of unsuitable habitat traps a hybrid zone between species whose hybrids are unfit (tension zone model). To test these, we examined the environmental factors influencing the spatial structure of a hybrid zone between the ground beetles Carabus maiyasanus and C. iwawakianus using GIS‐based quantification of environmental factors and a statistical comparison of species distribution models (SDMs). We determined that both of the hypothetical processes can be important in the hybrid zone. We detected interspecific differences in the environmental factors in presence localities and their relative contribution in SDMs. SDMs were not identical between species even within contact areas, but tended to be similar within the range of each species. These results suggest an association between environments and species, and provide evidence that ecological differentiation between species plays a role in the maintenance of the hybrid zone. Contact areas were characterized by a relatively high temperature, low precipitation, and high topological wetness. Thus, the contact areas were regarded as being located in an unsuitable habitat with a drier climate, where those populations are likely to occur in patches with limited precipitation concentrated. A comparison of spatial scales suggests that exogenous selection via environmental factors may be weaker than endogenous selection via genitalic incompatibility.

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Empirical study of hybrid zone movement

Cited by 306 publications

References 169 publications

Next-generation hybridization and introgression

Next-generation hybridization and introgression

Genetic-morphometric variation in Culex quinquefasciatus from Brazil and La Plata, Argentina

Ecological differentiation and habitat unsuitability maintaining a ground beetle hybrid zone

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