Females drive asymmetrical introgression from rare to common species in Darwin's tree finches

Peters, Katharina J.; Myers, Steven; Dudaniec, Rachael Y.; O’Connor, Jody A.; Kleindorfer, Sonia

doi:10.1111/jeb.13167

Cited by 42 publications

(68 citation statements)

References 100 publications

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“…In tree finches ( Camarhynchus spp. ), hybridization has also been detected on Floreana Island, likely associated with the introduction of the Philornis parasite (Kleindorfer et al, ; Peters, Myers, Dudaniec, O'Connor, & Kleindorfer, ). Overall, these studies suggest that introgressive hybridization in Darwin's finches is widespread.…”

Section: Discussionmentioning

confidence: 99%

Urbanization erodes niche segregation in Darwin's finches

León

Sharpe

Gotanda

et al. 2018

Evolutionary Applications

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Urbanization is influencing patterns of biological evolution in ways that are only beginning to be explored. One potential effect of urbanization is in modifying ecological resource distributions that underlie niche differences and that thus promote and maintain species diversification. Few studies have assessed such modifications, or their potential evolutionary consequences, in the context of ongoing adaptive radiation. We study this effect in Darwin's finches on the Galápagos Islands, by quantifying feeding preferences and diet niche partitioning across sites with different degrees of urbanization. We found higher finch density in urban sites and that feeding preferences and diets at urban sites skew heavily toward human food items. Furthermore, we show that finches at urban sites appear to be accustomed to the presence of people, compared with birds at sites with few people. In addition, we found that human behavior via the tendency to feed birds at non‐urban but tourist sites is likely an important driver of finch preferences for human foods. Site differences in diet and feeding behavior have resulted in larger niche breadth within finch species and wider niche overlap between species at the urban sites. Both factors effectively minimize niche differences that would otherwise facilitate interspecies coexistence. These findings suggest that both human behavior and ongoing urbanization in Galápagos are starting to erode ecological differences that promote and maintain adaptive radiation in Darwin's finches. Smoothing of adaptive landscapes underlying diversification represents a potentially important yet underappreciated consequence of urbanization. Overall, our findings accentuate the fragility of the initial stages of adaptive radiation in Darwin's finches and raise concerns about the fate of the Galápagos ecosystems in the face of increasing urbanization.

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Section: Discussionmentioning

confidence: 99%

Urbanization erodes niche segregation in Darwin's finches

León

Sharpe

Gotanda

et al. 2018

Evolutionary Applications

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“…The riverbed of the DC locality where bidirectional mitochondrial introgression occurred contains both sands and rocks approximately in equal portions. These environmental differences in the three localities suggest that hybrid female mating choice between males of the parental species might explain the morphological characteristics that result from backcrossing and lead to asymetrical introgression (Peters, Myers, Dudaniec, O'Connor, & Kleindorfer, ; Stein & Uy, ). Therefore, we expect that the direction of backcrossing and thus its resultant direction of mitochondrial introgression could be linked to the abundance of male species and/or a female choice, depending on environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Importantly, the number of HHL hybrids was the highest among three types of hybrids in the NA locality, and HHL hybrids were more morphologically similar to C. hankugensis (Figure 1). Environmental conditions of the NA locality, including the presence of a sandy bottom, are more suitable for C. hankugensis than I. longicorpa (Ko, 2009 (Peters, Myers, Dudaniec, O'Connor, & Kleindorfer, 2017;Stein & Uy, 2006). Therefore, we expect that the direction of backcrossing and thus its resultant direction of mitochondrial introgression could be linked to the abundance of male species and/or a female choice, depending on environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

Bidirectional mitochondrial introgression between Korean cobitid fish mediated by hybridogenetic hybrids

Kwan

Jeon

et al. 2018

Ecology and Evolution

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Genomic introgression through interspecific hybridization has been observed in some species of the freshwater fish family Cobitidae. Within this family, a Cobitis hankugensis–Iksookimia longicorpa diploid–triploid hybrid species complex on the Korean peninsula is unique in displaying hybridogenesis, a unisexual reproduction mode that allows hybrids to mediate the transfer of mitochondrial DNA (but not nuclear DNA) between the two parent species. However, populations of the parental species in the wild have never been examined for the potential effect of introgression on their genomes. To address the genetic consequences of unisexual hybridization on the parental species, we examined genetic structure of the two parental species, C. hankugensis and I. longicorpa, in three independent natural habitats where they coexist with their hybrid complex using DNA sequence data of one mitochondrial gene and three nuclear genes. We found that mitochondrial introgression between the two species was extensive in all the examined localities, while there was no evidence of nuclear introgression across the species boundary. This result indicates that the hybridogenetic individuals mediate mitochondrial introgression from one species to the other, producing mito‐nuclear mosaic genomes such as C. hankugensis nuclear genomes associated with I. longicorpa mitochondrial DNA and the reverse. The direction and degree of introgression varied among the three localities, but the underlying mechanisms for this observation proved elusive. Introgression might depend on which species serves as the predominant sperm or ovum donor or the environmental conditions of the localities. The present study suggests that introgressive hybridization between pure C. hankugensis and I. longicorpa species is highly likely where the two species co‐occur with hybridogenetic individuals, but the consequence of introgression could be variable due to the history and environmental characteristics of particular populations across the parental species’ ranges.

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“…Rates of introgression may also differ between the sexes due to interspecific differences in mate preferences [75]. Additionally, sex-biased dispersal [76] may lead to increased hybridization in the dispersive sex.…”

Section: 3) Through Unidirectional Hybridization Meiotic Drive Andmentioning

confidence: 99%

Hybridization, sex specific genomic architecture and local adaptation

Runemark

Eroukhmanoff

Bolanos

et al. 2018

Preprint

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While gene flow can reduce the potential for local adaptation, hybridization may conversely provide genetic variation that increases the potential for local adaptation.Hybridization may also affect adaptation through altering sexual dimorphism and sexual conflict, but this remains largely unstudied. Here, we discuss how hybridization may affect sexual dimorphism and conflict due to differential effects of hybridization on males and females, and then how this in turn may affect local adaptation. First, the lower viability of the heterogametic sex in hybrids could shift the balance in sexual conflict. Second, sex-specific inheritance of the mitochondrial genome in hybrids may lead to cyto-nuclear mismatches, for example in the form of "mother's curse", with potential consequences for sex-ratio and sex specific expression. Third, transgressive segregation of sexually antagonistic alleles could lead to greater sexual dimorphism in hybrid populations. These mechanisms can reduce sexual conflict and enhance intersexual niche partitioning, increasing the fitness of hybrids. Adaptive introgression of alleles reducing sexual conflict or enhancing intersexual niche partitioning may facilitate local adaptation, and could favour the colonization of novel habitats. We review these consequences of hybridization on sex differences and local adaptation, and discuss how their prevalence and importance could be tested empirically.

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Females drive asymmetrical introgression from rare to common species in Darwin's tree finches

Cited by 42 publications

References 100 publications

Urbanization erodes niche segregation in Darwin's finches

Urbanization erodes niche segregation in Darwin's finches

Bidirectional mitochondrial introgression between Korean cobitid fish mediated by hybridogenetic hybrids

Hybridization, sex specific genomic architecture and local adaptation

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