A widely-used pollutant causes reversal of conspecific mate preference in a freshwater fish

Powell, Daniel L.; Rose, Aaron D.; Rosenthal, Gil G.

doi:10.1101/2022.09.07.507014

Cited by 3 publications

(4 citation statements)

References 57 publications

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“…As environments continue to rapidly change, and become more variable, due to climate change, we may expect to see more opportunities for hybridization 58,59 . Reduced reproductive isolation and increased introgression have already been observed in other systems in response to pollution 60 , changes in water turbidity 61,62 , and disturbance 63,64 . An important next step will be to determine whether changes in the rates of introgression with global change have adaptive (e.g., refs 65,66 ) or maladaptive consequences in natural settings.…”

Section: Discussionmentioning

confidence: 62%

Mating system and environment predict the direction and extent of introgression between incipientClarkiaspecies

Sianta,

Moeller,

Brandvain

2023

Preprint

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Introgression is pervasive across the tree of life, varying across taxa, geography, and genomes. However, we are only beginning to understand the factors that modulate this variation and how they may be affected by global change. Here, we used 200 genomes and a 15-year site-specific environmental dataset to investigate the effect of mating system divergence and environmental variation on the magnitude of introgression between two recently diverged annual plants. Two subspecies of Clarkia xantiana diverged ca. 65k years ago and subsequently came into secondary sympatry where they form replicated contact zones. We found that introgression is asymmetric between taxa, with substantially more introgression from the self-fertilizing taxon to the outcrossing taxon. This asymmetry is caused by a bias in the direction of initial F1 hybrid formation and subsequent backcrossing. We also found extensive variation in the outcrosser admixture proportions among contact zones, which is predicted nearly entirely by interannual variance in spring precipitation. Greater fluctuations in spring precipitation result in higher admixture proportions, likely mediated by the effects of spring precipitation on the expression of traits that determine premating reproductive isolation. Climate-driven hybridization dynamics may be particularly affected by global change, potentially reshaping species boundaries and adaptation to novel environments.

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Section: Discussionmentioning

confidence: 62%

Mating system and environment predict the direction and extent of introgression between incipientClarkiaspecies

Sianta,

Moeller,

Brandvain

2023

Preprint

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“…To investigate behavioral mechanisms that might be linked to assortative mating in these species, we collected X. birchmanni and X. cortezi individuals from allopatric populations to test the presence and strength of conspecific mating preferences. Female preferences for conspecific male visual and olfactory cues are common across Xiphophorus (e.g., 42,43,37), and are thought to be important in maintaining isolation between species (44).…”

Section: Female Behavioral Trials Do Not Explain Assortative Matingmentioning

confidence: 99%

“…We leverage naturally hybridizing species of swordtails ( Xiphophorus ), freshwater fish native to eastern México and Central America, to explore their complex reproductive barriers as well as how hybridization interacts with these barriers in nature. Past work in this species group has explored the role of a variety of isolating mechanisms in this genus independently: including, genetic incompatibilities (31–33), genomic architecture (30, 34), mate preferences (35–37), and ecological differences (38). Here, we combine whole genome sequencing from a natural hybrid population and artificial crosses with behavioral assays in the closely related species, X. birchmanni and X. cortezi (39), to disentangle the isolating mechanisms that impact them in nature.…”

Section: Introductionmentioning

confidence: 99%

“…Past work in this species group has explored the role of a variety of isolating mechanisms in this genus independently: including, genetic incompatibilities (31)(32)(33), genomic architecture (30,34), mate preferences (35)(36)(37), and ecological differences (38). Here, we combine whole genome sequencing from a natural hybrid population and artificial crosses with behavioral assays in the closely related species, X. birchmanni and X. cortezi (39), to disentangle the isolating mechanisms that impact them in nature.…”

Section: Introductionmentioning

confidence: 99%

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Pervasive gene flow despite strong and varied reproductive barriers in swordtails

Aguillon,

Haase Cox,

Langdon

et al. 2024

Preprint

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One of the mechanisms that can lead to the formation of new species occurs through the evolution of reproductive barriers. However, recent research has demonstrated that hybridization has been pervasive across the tree of life even in the presence of strong barriers. Swordtail fishes (genusXiphophorus) are an emerging model system for studying the interface between these barriers and hybridization. We document overlapping mechanisms that act as barriers between closely related species,X. birchmanniandX. cortezi, by combining genomic sequencing from natural hybrid populations, artificial crosses, behavioral assays, sperm performance, and developmental studies. We show that strong assortative mating plays a key role in maintaining subpopulations with distinct ancestry in natural hybrid populations. Lab experiments demonstrate that artificial F1 crosses experience dysfunction: crosses withX. birchmannifemales were largely inviable and crosses withX. cortezifemales had a heavily skewed sex ratio. Using F2 hybrids we identify several genomic regions that strongly impact hybrid viability. Strikingly, two of these regions underlie genetic incompatibilities in hybrids betweenX. birchmanniand its sister speciesX. malinche. Our results demonstrate that ancient hybridization has played a role in the origin of this shared genetic incompatibility. Moreover, ancestry mismatch at these incompatible regions has remarkably similar consequences for phenotypes and hybrid survival inX. cortezi×X. birchmannihybrids as inX. malinche×X. birchmannihybrids. Our findings identify varied reproductive barriers that shape genetic exchange between naturally hybridizing species and highlight the complex evolutionary outcomes of hybridization.

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The extent of introgression between incipient Clarkia species is determined by temporal environmental variation and mating system

Sianta,

Moeller,

Brandvain

2024

Proc. Natl. Acad. Sci. U.S.A.

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Introgression is pervasive across the tree of life but varies across taxa, geography, and genomic regions. However, the factors modulating this variation and how they may be affected by global change are not well understood. Here, we used 200 genomes and a 15-y site-specific environmental dataset to investigate the effects of environmental variation and mating system divergence on the magnitude of introgression between a recently diverged outcrosser-selfer pair of annual plants in the genus Clarkia . These sister taxa diverged very recently and subsequently came into secondary sympatry where they form replicated contact zones. Consistent with observations of other outcrosser-selfer pairs, we found that introgression was asymmetric between taxa, with substantially more introgression from the selfer to the outcrosser. This asymmetry was caused by a bias in the direction of initial F1 hybrid formation and subsequent backcrossing. We also found extensive variation in the outcrosser’s admixture proportion among contact zones, which was predicted nearly entirely by interannual variance in spring precipitation. Greater fluctuations in spring precipitation resulted in higher admixture proportions, likely mediated by the effects of spring precipitation on the expression of traits that determine premating reproductive isolation. Climate-driven hybridization dynamics may be particularly affected by global change, potentially reshaping species boundaries and adaptation to novel environments.

show abstract

A widely-used pollutant causes reversal of conspecific mate preference in a freshwater fish

Cited by 3 publications

References 57 publications

Mating system and environment predict the direction and extent of introgression between incipientClarkiaspecies

Mating system and environment predict the direction and extent of introgression between incipientClarkiaspecies

Pervasive gene flow despite strong and varied reproductive barriers in swordtails

The extent of introgression between incipient Clarkia species is determined by temporal environmental variation and mating system

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