Unidirectional Hybridization and Introgression in an Avian Contact Zone: Evidence from Genetic Markers, Morphology, and Comparisons with Laboratory-Raised F<sub>1</sub>Hybrids

Hartog, Paula M. den; Boer-Visser, Ardie M. den; Cate, Carel ten

doi:10.1525/auk.2010.10002

Cited by 18 publications

(8 citation statements)

References 59 publications

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“…This estimate of DNA quantity was used to determine how much of each sample to use for the ligation step. The protocol described in den Hartog et al (2010) was used, modified from Vos et al (1995). Total genomic DNA was restricted with 2.5 units each of the restriction enzymes EcoRI and MseI (New England Biolabs, Ipswich, MA, USA), in a total volume of 20 lL containing a 109 ligase buffer (New England Biolabs) and 1 lg of BSA.…”

Section: Genetic Analysismentioning

confidence: 99%

Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression

Halfwerk

Dingle

Brinkhuizen

et al. 2016

J of Evolutionary Biology

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Birdsong is a sexually selected trait that could play an important evolutionary role when related taxa come into secondary contact. Many songbird species, however, learn their songs through copying one or more tutors, which complicates the evolutionary outcome of such contact. Two subspecies of a presumed vocal learner, the grey-breasted wood-wren (Henicorhina leucophrys), replace each other altitudinally across the western slope of the Ecuadorian Andes. These subspecies are morphologically very similar, but show striking differences in their song. We examined variation in acoustic traits and genetic composition across the altitudinal range covered by both subspecies and between two allopatric populations. The acoustic boundary between the subspecies was found to be highly abrupt across a narrow elevational range with virtually no evidence of song convergence. Mixed singing and use of hetero-subspecific song occurred in the contact zone and was biased towards the use of leucophrys song types. Hetero-subspecific song copying by hilaris and not by leucophrys reflected a previously found asymmetric pattern of response to song playback. Using amplified fragment length polymorphisms (AFLP) markers, we detected hybridization in the contact zone and asymmetric introgression in parapatric populations, with more leucophrys alleles present in hilaris populations than vice versa. This pattern may be a trail of introgression due to upslope displacement of leucophrys by hilaris. Our data suggest that song learning may impact speciation and hybridization in contrasting ways at different spatial scales: although learning may speed up population divergence in songs, thereby enhancing assortative mating and reducing gene flow, it may at a local level also lead to the copying of heterospecific songs, therefore allowing some level of hybridization and introgression.

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Section: Genetic Analysismentioning

confidence: 99%

Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression

Halfwerk

Dingle

Brinkhuizen

et al. 2016

J of Evolutionary Biology

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“…To do so, we used the F1/F2 allocation procedure of aflpop (Duchesne & Bernatchez 2002; e.g. den Hartog et al. 2010; McKinnon et al.…”

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confidence: 99%

Historical introgression and the role of selective vs. neutral processes in structuring nuclear genetic variation (AFLP) in a circumpolar marine fish, the capelin (Mallotus villosus)

et al. 2011

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The capelin (Mallotus villosus) is a widespread marine fish species for which previous work has identified geographically distinct mtDNA clades, the frontiers of which are well within adult and larval dispersal capabilities. Here, we use AFLPs to test for the presence of nuclear gene flow among clades. In addition, we evaluate genetic structuring within one clade, the Northwest Atlantic (NWA). We found that each of the mtDNA clades corresponds with a unique nuclear DNA genetic cluster. Within the NWA clade, we detected individuals with small but significant amounts of genetic ancestry from other clades, likely due to historical introgression. Further support for historical introgression comes from analyses of variance in locus-specific differentiation, which support introgression between some clades and divergence without gene flow between others. Within the NWA, we identified two genetic clusters that correspond to sites in geographically adjacent areas. However, these clusters differ primarily at 'outlier' loci, and a genetic subdivision (K=2) was not supported by genetic clustering programs using neutral loci. Significant neutral F(ST) differentiation was found only between sites that otherwise differed at outlier loci. Thus, these populations may be in the initial stages of 'isolation by adaptation'. These results suggest strong between-clade reproductive isolation despite opportunities for gene flow and support the hypothesis that selection can contribute to divergence in otherwise 'open' systems.

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“…This numerical imbalance can explain the asymmetrical gene flow from Yellow-billed Pintail into Speckled Teal (McCracken and Wilson, 2011). Similar cases have been described for Mallard and Eastern Spot-billed Ducks in Eastern Russia (Kulikova et al, 2004) and Streptopelia doves in Uganda (den Hartog et al, 2010).…”

Section: Demographysupporting

confidence: 66%

Crossing species boundaries : the hybrid histories of the true geese

Ottenburghs¹

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. Crossing Species Boundaries: The Hybrid Histories of the True Geese. PhD thesis, Wageningen University, the Netherlands. Hybridization, the interbreeding of different species, is a common phenomenon in birds: about 16% of bird species is known to have hybridized with at least one other species. Numerous avian hybrid zones have been studied from a morphological or genetic perspective, often documenting the interspecific exchange of genetic material by hybridization and backcrossing (i.e. introgression). The incidence of hybridization varies among bird orders with the Anseriformes (waterfowl: ducks, geese and swans) showing the highest propensity to hybridize. In this thesis, I provide a genomic perspective on the role of hybridization in the evolutionary history of one particular anseriform tribe, the Anserini or "True Geese", which comprises 17 species divided over two genera: Anser and Branta . The diversification of this bird group took place in the late Pliocene and the early Pleistocene (between four and two million years ago), conceivably driven by a global cooling trend that led to the establishment of a circumpolar tundra belt and the emergence of temperate grasslands. Most species show a steady population increase during this period, followed by population subdivision during the Last Glacial Maximum about 110,000 to 12,000 years ago. The combination of large effective population sizes and occasional range shifts facilitated contact between the diverging goose species, resulting in high levels of interspecific gene flow. Introgressive hybridization might have enabled these goose populations to quickly adapt to changing environments by transferring of advantageous alleles across species boundaries, increasing standing genetic variation or expanding phenotypic variation of certain traits (e.g., beak morphology). Hybridization seems to be a common and integral component in the evolution and diversification of geese. The pervasiveness of rapid speciation and hybridization in geese complicates the attempt to capture their evolutionary history in a phylogenetic tree, therefore I advocate a phylogenetic network approach. Indeed, trying to capture the complex diversification of the True Geese in a branching tree can be regarded as a wild goose chase. Abstract TABLE OF CONTENTS

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Unidirectional Hybridization and Introgression in an Avian Contact Zone: Evidence from Genetic Markers, Morphology, and Comparisons with Laboratory-Raised F₁Hybrids

Cited by 18 publications

References 59 publications

Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression

Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression

Historical introgression and the role of selective vs. neutral processes in structuring nuclear genetic variation (AFLP) in a circumpolar marine fish, the capelin (Mallotus villosus)

Crossing species boundaries : the hybrid histories of the true geese

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Unidirectional Hybridization and Introgression in an Avian Contact Zone: Evidence from Genetic Markers, Morphology, and Comparisons with Laboratory-Raised F1Hybrids

Cited by 18 publications

References 59 publications

Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression

Sharp acoustic boundaries across an altitudinal avian hybrid zone despite asymmetric introgression

Historical introgression and the role of selective vs. neutral processes in structuring nuclear genetic variation (AFLP) in a circumpolar marine fish, the capelin (Mallotus villosus)

Crossing species boundaries : the hybrid histories of the true geese

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Unidirectional Hybridization and Introgression in an Avian Contact Zone: Evidence from Genetic Markers, Morphology, and Comparisons with Laboratory-Raised F₁Hybrids