Phenotypic and genotypic variation across a stable white-eye (Zosterops sp.) hybrid zone in central South Africa

Oatley, Graeme; Swardt, Dawid H de; Nuttall, Rick; Crowe, Timothy M.; Bowie, Rauri C. K.

doi:10.1093/biolinnean/blx012

Cited by 15 publications

(17 citation statements)

References 59 publications

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“…; Oatley et al. , ), our failure to detect gene flow between these two Zosterops species suggests that the presence of strong reproductive barriers existed or rapidly evolved upon secondary contact (i.e., Scenario 1 or 2 from Table ).…”

Section: Discussionmentioning

confidence: 86%

“…), and the other is in Zosterops virens subspecies in Cape Region of South Africa (0.77 my diverged; Oatley et al. , ). To our knowledge, no other study has examined the genomics of reproductive isolation in depth between two overlapping species of Zosterops at an age greater than 1 million years apart, or using a genome‐wide sequencing method such as RADseq.…”

Section: Genomic and Phenotypic Patterns Of Secondary Contact In Two mentioning

confidence: 99%

“…Given that hybridization is common in birds (Grant and Grant 1992), detectable in several other congeneric avian species in secondary contact with similar or greater times of divergence (see Fig. 5, Table 1), and in younger white-eye secondary contact zones less than 0.8 million years old (e.g., Milá et al 2010;Oatley et al 2012Oatley et al , 2017, our failure to detect gene flow between these two Zosterops species suggests that the presence of strong reproductive barriers existed or rapidly evolved upon secondary contact (i.e., Scenario 1 or 2 from Table 1).…”

Section: Reproductive Barriersmentioning

confidence: 99%

“…Although several examples exist where multiple white-eye Zosterops species or subspecies coexist and are thought to have come into secondary contact within the last 2 million years (e.g., Warren et al 2006;Clegg and Phillimore 2010;Melo et al 2011;Wickramasinghe et al 2017), we know of only two previous studies in which gene flow has been examined and hybridization detected between two parapatric subspecies of white-eyes using multiple genomic markers. One is between subspecies of Zosterops barbonicus on Reunion Island (0.434 my diverged; Milá et al 2010), and the other is in Zosterops virens subspecies in Cape Region of South Africa (0.77 my diverged; Oatley et al 2012Oatley et al , 2017. To our knowledge, no other study has examined the genomics of reproductive isolation in depth between two overlapping species of Zosterops at an age greater than 1 million years apart, or using a genome-wide sequencing method such as RADseq.…”

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confidence: 99%

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Rapid, complete reproductive isolation in two closely relatedZosteropsWhite‐eye bird species despite broadly overlapping ranges*

Cowles

2019

Evolution

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Examining what happens when two closely related species come into secondary contact provides insight into the later stages of the speciation process. The Zosteropidae family of birds is one of the most rapidly speciating vertebrate lineages. Members of this family are highly vagile and geographically widespread, raising the question of how divergence can occur if populations can easily come into secondary contact. On the small island of Kolombangara, two closely related nonsister species of white‐eyes, Zosterops kulambangrae and Zosterops murphyi, are distributed along an elevational gradient and come into secondary contact at mid‐elevations. We captured 134 individuals of both species along two elevational transects. Using genotyping‐by‐sequencing data and a mitochondrial marker, we found no evidence of past hybridization events and strong persistence of species boundaries, even though the species have only been diverging for approximately 2 million years. We explore potential reproductive barriers that allow the two species to coexist in sympatry, including premating isolation based on divergence in plumage and song. We also conducted a literature review to determine the time it takes to evolve complete reproductive isolation in congeneric avian species/subspecies in secondary contact (restricted to cases where congeneric taxa are parapatric or have a hybrid zone), finding our study is one of the youngest examples of complete reproductive isolation studied in a genomic context reported in birds.

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Section: Discussionmentioning

confidence: 86%

Section: Genomic and Phenotypic Patterns Of Secondary Contact In Two mentioning

confidence: 99%

Section: Reproductive Barriersmentioning

confidence: 99%

mentioning

confidence: 99%

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Rapid, complete reproductive isolation in two closely relatedZosteropsWhite‐eye bird species despite broadly overlapping ranges*

Cowles

2019

Evolution

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“…have long been used as models to study bird speciation (e.g. Clegg and Philimore 2010; Melo et al 2011;Oatley et al 2012;Oatley et al 2017). Among all white-eyes species, the Reunion grey white-eye Zosterops borbonicus received 120 considerable attention over the last 50 years.…”

Section: Introductionmentioning

confidence: 99%

A bird’s white-eye view on avian sex chromosome evolution

Leroy

Anselmetti

Tilak

et al. 2018

Preprint

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Chromosomal organization is relatively stable among avian species, especially with regards to sex chromosomes. Members of the large Sylvioidea clade however have a pair of neo-sex chromosomes which is unique to this clade and originate from a parallel translocation of a region of the ancestral 4A chromosome on both W and Z chromosomes. Here, we took advantage of this unusual event to study the early stages of sex chromosome evolution. To do so, we sequenced a female (ZW) of two Sylvioidea species, a Zosterops borbonicus and a Z. pallidus. Then, we organized the Z. borbonicus scaffolds along chromosomes and annotated genes. Molecular phylogenetic dating under various methods and calibration sets confidently confirmed the recent diversification of the genus Zosterops (1-3.5 million years ago), thus representing one of the most exceptional rates of diversification among vertebrates. We then combined genomic coverage comparisons of five males and seven females, and homology with the zebra finch genome (Taeniopygia guttata) to identify sex chromosome scaffolds, as well as the candidate chromosome breakpoints for the two translocation events. We observed reduced levels of within-species diversity in both translocated regions and, as expected, even more so on the neoW chromosome. In order to compare the rates of molecular evolution in genomic regions of the autosomal-to-sex transitions, we then estimated the ratios of non-synonymous to synonymous polymorphisms (π N /π S ) and substitutions (d N /d S ). Based on both ratios, no or little contrast between autosomal and Z genes was observed, thus representing a very different outcome than the higher ratios observed at the neoW genes. In addition, we report significant changes in base composition content for translocated regions on the W and Z chromosomes and a large accumulation of transposable elements (TE) on the newly W region. Our results revealed contrasted signals of molecular evolution changes associated to these autosome-tosex chromosome transitions, with congruent signals of a W chromosome degeneration yet a surprisingly weak support for a fast-Z effect.

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On the brink of explosion? Identifying the source and potential spread of introduced Zosterops white-eyes in North America

DeRaad,

Cobos,

Hofmeister

et al. 2024

Biol Invasions

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Phenotypic and genotypic variation across a stable white-eye (Zosterops sp.) hybrid zone in central South Africa

Cited by 15 publications

References 59 publications

Rapid, complete reproductive isolation in two closely relatedZosteropsWhite‐eye bird species despite broadly overlapping ranges*

Rapid, complete reproductive isolation in two closely relatedZosteropsWhite‐eye bird species despite broadly overlapping ranges*

A bird’s white-eye view on avian sex chromosome evolution

On the brink of explosion? Identifying the source and potential spread of introduced Zosterops white-eyes in North America

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