Limited Song Mixing Without Genomic Gene Flow in a Contact Zone Between Two Songbird Species

Wu, Lei; Dang, Jing; Tang, Linfang; Cheng, Yanhao; Song, Gang; Sun, Yue‐Hua; Martens, Jochen; Päckert, Martin; Alström, Per; Zhang, Dezhi; Jia, Chenxi; Lei, Fumin

doi:10.1093/molbev/msad053

Cited by 4 publications

(2 citation statements)

References 122 publications

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“…Acoustic communication is an important way of animal communication and has been extensively studied in mammals, birds, bats, insects, and amphibians (Fan et al., 2022; Kingston & Rossiter, 2004; Luo & Huang, 2021; Shen et al., 2023; Wu et al., 2023). Calling is a critical mode of interspecific and intraspecific interaction in anurans, where it is crucial for interspecific identification, reproduction, and evolution (Brenowitz & Rose, 1999; Cunningham & Birkhead, 1998; Kelley, 2004).…”

Section: Introductionmentioning

confidence: 99%

Acoustic difference in advertisement calls among two sympatric Boulenophrys species: A confirmatory case to acoustic niche hypothesis and morphological constraint hypothesis

Shen,

Liu,

Tang

et al. 2024

Ecology and Evolution

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In anurans, acoustic communication is the most important form of communication at the interspecific and intraspecific levels. Acoustic diagnostic features may be a potential alternative to morphometric and molecular diagnostics. Here, we assessed the variations in advertisement calls between two sympatric species, Boulenophrys leishanensis and Boulenophrys spinata, that share their breeding season and breeding sites. In addition, we investigated any potential relationships between call parameters and body size. We found that the advertisement calls of both species are simple calls. The two species exhibited significant differences in all call parameters. Both B. leishanensis and B. spinata showed a significant negative correlation with their body size on dominant frequency. These differences in call parameters may play an important role in interspecific recognition. Additionally, because intraspecific acoustic variation reflects body size, calls may be relevant for sexual selection. Our study supports the acoustic niche hypothesis and the morphological constraint hypothesis and calls are a valid tool for distinguishing between the two species of Boulenophrys in the field.

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Section: Introductionmentioning

confidence: 99%

Acoustic difference in advertisement calls among two sympatric Boulenophrys species: A confirmatory case to acoustic niche hypothesis and morphological constraint hypothesis

Shen,

Liu,

Tang

et al. 2024

Ecology and Evolution

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“…

Contact zones between divergent forms of the same species provide an excellent opportunity to study how isolating barriers are formed and disintegrated during the process of speciation.Contact zones are typically found in areas of ecological transition, where an environmental gradient exists between habitats, leading to overlap between divergent populations that are adapted to different environments (Abbott, 2017;Johannesson et al, 2020;Keller & Seehausen, 2012). If speciation is advanced, hybridization across contact zones may be very limited or even non-existent (Wu et al, 2023). If divergence between overlapping populations is low, hybridization may involve multiple generations of hybrid offspring that can backcross to one or both parental populations, allowing genetic exchange (introgression) between divergent forms (Cahan et al, 2023).

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confidence: 99%

Reproductive isolation in a three‐way contact zone

Dean,

Whiting,

Jones

et al. 2024

Molecular Ecology

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Contact zones between divergent forms within a species provide insight into the role of gene flow in adaptation and speciation. Previous work has focused on contact zones involving only two divergent forms, but in nature, many more than two populations may overlap simultaneously and experience gene flow. Patterns of introgression in wild populations are, therefore, likely much more complicated than is often assumed. We begin to address this gap in current knowledge by investigating patterns of divergence and introgression across a complex natural contact zone. We use phenotypic and genomic data to confirm the existence of a three‐way contact zone among divergent freshwater resident, saltwater resident and saltwater migratory three‐spined stickleback (Gasterosteus aculeatus) on the island of North Uist, Scottish Western Isles. We find evidence for hybridization, mostly between saltwater resident and saltwater migratory forms. Despite hybridization, genomic analyses reveal pairwise islands of divergence between all forms that are maintained across the contact zone. Genomic cline analyses also provide evidence for selection and/or hybrid incompatibilities in divergent regions. Divergent genomic regions occur across multiple chromosomes and involve many known adaptive loci and several chromosomal inversions. We also identify distinct immune gene expression profiles between forms, but no evidence for transgressive expression in hybrids. Our results suggest that reproductive isolation is maintained in this three‐way contact zone, despite some hybridization, and that reduced recombination in chromosomal inversions may play an important role in maintaining this isolation.

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How common is hybridization in birds?

Ottenburghs

2023

J Ornithol

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Hybridization—the interbreeding of different species—plays an integral role in the evolution of numerous bird species. However, it remains unclear how widespread this phenomenon is within and across different bird groups. Estimating the incidence of hybridization in different bird lineages can inform comparative analyses to uncover the evolutionary and ecological forces that promote or prevent the formation of hybrids. Estimates on a species level have varied from about 10% to almost 20% of hybridizing bird species. The variation among the latest estimates largely depends on the choice of global species checklists with differing decisions on the taxonomic status of certain (sub)species. However, the hybrid records in these estimates have generally been taken at face value. Detailed assessments of these records revealed that some cases are unreliable or incorrect. Removing of these faulty records and discovery of novel hybrids will result in a fluctuating percentage of hybridizing species that can best be captured in a living document (e.g., a regularly updated website or checklist). Estimating hybridization on an individual level is more challenging. A first attempt, using citizen science data from the eBird project, reported 0.064% hybrid individuals in the United States. This percentage is probably an underestimate due to underreporting of hybrids by birdwatchers and remains to be finetuned by considering other confounding factors, such as spatial and temporal variation in hybridization dynamics. Future efforts in estimating avian hybridization will need to rely on a combination of data sources and techniques, such as genetics, museum specimens, and citizen science.

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Limited Song Mixing Without Genomic Gene Flow in a Contact Zone Between Two Songbird Species

Cited by 4 publications

References 122 publications

Acoustic difference in advertisement calls among two sympatric Boulenophrys species: A confirmatory case to acoustic niche hypothesis and morphological constraint hypothesis

Acoustic difference in advertisement calls among two sympatric Boulenophrys species: A confirmatory case to acoustic niche hypothesis and morphological constraint hypothesis

Reproductive isolation in a three‐way contact zone

How common is hybridization in birds?

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