Hybridization in brushfinches (Atlapetes, Emberizidae) from the southeast Andes of Colombia: a consequence of habitat disturbance?

Carantón-Ayala, Diego; Avendaño, Jorge Enrique; Cadena, Carlos Daniel

doi:10.1007/s10336-018-1544-1

Cited by 7 publications

(6 citation statements)

References 36 publications

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“…First, previous morphological studies addressing taxonomic limits and distributions in this species have characterized a hybrid swarm occurring between S. c. corvina and S. c. hicksii in central Panama (Hellmayr, 1938;Olson, 1981;Stiles, 1996;Figure 1a, no. 1), while the contact zone between S. c. hoffmanni and S. c. hicksii is less clearly understood as an intergradation of these subspecies at the Pacific slope in Veraguas province, based on a few specimen records of intermediate phenotypes (Olson, 1981; (Joyce, 2006), creating artificial corridors that could have facilitated interbreeding between previously isolated clades (Carantón-Ayala et al, 2018;Moulton et al, 2017). However, these contact zones and interactions between subspecies are poorly studied, and to date little is known about the genetic consequences of these three independent contact zones or the demographic history shaping the genetic structure of this group.…”

Section: Characterizations Of Hybrid Individuals and Hybrid Zones Offermentioning

confidence: 99%

“…3). This final contact zone might have been mediated by deforestation and urbanization in Costa Rica over the last few decades (Joyce, 2006), creating artificial corridors that could have facilitated interbreeding between previously isolated clades (Carantón‐Ayala et al, 2018; Moulton et al, 2017). However, these contact zones and interactions between subspecies are poorly studied, and to date little is known about the genetic consequences of these three independent contact zones or the demographic history shaping the genetic structure of this group.…”

Section: Introductionmentioning

confidence: 99%

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Replicate contact zones suggest a limited role of plumage in reproductive isolation among subspecies of the variable seedeater (Sporophila corvina)

et al. 2023

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After establishing secondary contact, recently diverged populations may remain reproductively isolated or may hybridize to a varying extent depending on factors such as hybrid fitness and the strength of assortative mating. Here, we used genomic and phenotypic data from three independent contact zones between subspecies of the variable seedeater (Sporophila corvina) to examine how coloration and genetic divergence shape patterns of hybridization. We found that differences in plumage coloration are probably maintained by divergent selection across contact zones; however, the degree of plumage differentiation does not match overall patterns of hybridization. Across two parallel contact zones between populations with divergent phenotypes (entirely black vs. pied plumage), populations hybridized extensively across one contact zone but not the other, suggesting that plumage divergence is not sufficient to maintain reproductive isolation. Where subspecies hybridized, hybrid zones were wide and formed by later-generation hybrids, suggesting frequent reproduction and high survivorship for hybrid individuals. Moreover, contemporary gene flow has played an important role in shaping patterns of genetic structure between populations. Replicated contact zones between hybridizing taxa offer a unique opportunity to explore how different factors interact to shape patterns of hybridization. Overall, our results demonstrate that divergence in plumage coloration is important in reducing gene flow but insufficient in maintaining reproductive isolation in this clade, and that other factors such as divergence in song and time since secondary contact may also play an important role in driving patterns of reduced hybridization and gene flow.

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Section: Characterizations Of Hybrid Individuals and Hybrid Zones Offermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Replicate contact zones suggest a limited role of plumage in reproductive isolation among subspecies of the variable seedeater (Sporophila corvina)

et al. 2023

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“…In several plant species, the rate of hybridization increased with the level of disturbance in the area, such as the concentration of heavy metals (Coppi et al, 2020 ) or the frequency of wildfires (Ortego et al, 2017 ). Hybridization can also be the outcome of homogenization of the habitat or the construction of landscape features that facilitate dispersal (e.g., roads and verges), culminating in contact between previously isolated populations (Bangs et al, 2017 ; Carantón‐Ayala et al, 2018 ; van Hengstum et al, 2012 ). For instance, deforestation has led to hybridization between certain insect (Sivyer et al, 2018 ) and amphibian populations (Bell & Irian, 2019 ).…”

Section: Mechanisms Of Anthropogenic Hybridizationmentioning

confidence: 99%

The genic view of hybridization in the Anthropocene

Ottenburghs

2021

Evolutionary Applications

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“…This definition purposely excludes global climate change and the introduction of non‐native species, both of which can increase hybridization and have been well‐reviewed (Blois et al, 2013; Moran & Alexander, 2014). While an increasing number of studies have detected hybrids following large‐scale habitat disturbances in a wide variety of taxa (e.g., shrubs: Lamont et al, 2003, fishes: Huuskonen et al, 2017, birds: Carantón‐Ayala et al, 2018, reviewed in Grabenstein & Taylor (2018)), comparatively few studies have intentionally been designed to explore the relationship between human habitat disturbances and hybridization of closely related taxa (Ortego et al, 2016; Seehausen et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Hybridization between closely related songbirds is related to human habitat disturbance

Grabenstein

Otter

Burg

et al. 2022

Global Change Biology

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Human habitat disturbances can promote hybridization between closely related, but typically reproductively isolated, species. We explored whether human habitat disturbances are related to hybridization between two closely related songbirds, blackcapped and mountain chickadees, using both genomic and citizen science data sets.First, we genotyped 409 individuals from across both species' ranges using reducedrepresentation genome sequencing and compared measures of genetic admixture to a composite measure of human landscape disturbance. Then, using eBird observations, we compared human landscape disturbance values for sites where phenotypically diagnosed hybrids were observed to locations where either parental species was observed to determine whether hybrid chickadees are reported in more disturbed areas. We found that hybridization between black-capped and mountain chickadees positively correlates with human habitat disturbances. From genomic data, we found that (1) hybrid index (HI) significantly increased with habitat disturbance, (2) more hybrids were sampled in disturbed habitats, (3) mean HIs were higher in disturbed habitats versus wild habitats, and (4) hybrids were detected in habitats with significantly higher disturbance values than parentals. Using eBird data, we found that both hybrid and black-capped chickadees were significantly more disturbance-associated than mountain chickadees. Surprisingly, we found that nearly every black-capped chickadee we sampled contained some proportion of hybrid ancestry, while we detected very few mountain chickadee backcrosses. Our results highlight that hybridization between black-capped and mountain chickadees is widespread, but initial hybridization is rare (few F1s were detected). We conclude that human habitat disturbances can erode pre-zygotic reproductive barriers between chickadees and that post-zygotic isolation is incomplete. Understanding what becomes of recently hybridizing species following large-scale habitat disturbances is a new, but pressing, consideration for successfully preserving genetic biodiversity in a rapidly changing world.

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Hybridization in brushfinches (Atlapetes, Emberizidae) from the southeast Andes of Colombia: a consequence of habitat disturbance?

Cited by 7 publications

References 36 publications

Replicate contact zones suggest a limited role of plumage in reproductive isolation among subspecies of the variable seedeater (Sporophila corvina)

Replicate contact zones suggest a limited role of plumage in reproductive isolation among subspecies of the variable seedeater (Sporophila corvina)

The genic view of hybridization in the Anthropocene

Hybridization between closely related songbirds is related to human habitat disturbance

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