Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers.
Hybridization among taxa impacts a variety of evolutionary processes from adaptation to extinction. We seek to understand both patterns of hybridization across taxa and the evolutionary and ecological forces driving those patterns. To this end, we use whole-genome low-coverage sequencing of 458 wild...
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Public Library of Science (PLoS)
2025-03-01
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| Series: | PLoS Genetics |
| Online Access: | https://doi.org/10.1371/journal.pgen.1011624 |
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| author | Matthew C Farnitano Keith Karoly Andrea L Sweigart |
| author_facet | Matthew C Farnitano Keith Karoly Andrea L Sweigart |
| author_sort | Matthew C Farnitano |
| collection | DOAJ |
| description | Hybridization among taxa impacts a variety of evolutionary processes from adaptation to extinction. We seek to understand both patterns of hybridization across taxa and the evolutionary and ecological forces driving those patterns. To this end, we use whole-genome low-coverage sequencing of 458 wild-grown and 1565 offspring individuals to characterize the structure, stability, and mating dynamics of admixed populations of Mimulus guttatus and Mimulus nasutus across a decade of sampling. In three streams, admixed genomes are common and a M. nasutus organellar haplotype is fixed in M. guttatus, but new hybridization events are rare. Admixture is strongly unidirectional, but each stream has a unique distribution of ancestry proportions. In one stream, three distinct cohorts of admixed ancestry are spatially structured at ~20-50m resolution and stable across years. Mating system provides almost complete isolation of M. nasutus from both M. guttatus and admixed cohorts, and is a partial barrier between admixed and M. guttatus cohorts. Isolation due to phenology is near-complete between M. guttatus and M. nasutus. Phenological isolation is a strong barrier in some years between admixed and M. guttatus cohorts, but a much weaker barrier in other years, providing a potential bridge for gene flow. These fluctuations are associated with differences in water availability across years, supporting a role for climate in mediating the strength of reproductive isolation. Together, mating system and phenology accurately predict fluctuations in assortative mating across years, which we estimate directly using paired maternal and offspring genotypes. Climate-driven fluctuations in reproductive isolation may promote the longer-term stability of a complex mosaic of hybrid ancestry, preventing either complete isolation or complete collapse of species barriers. |
| format | Article |
| id | doaj-art-14409f794ede45839de2e448d4e27cb1 |
| institution | OA Journals |
| issn | 1553-7390 1553-7404 |
| language | English |
| publishDate | 2025-03-01 |
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| series | PLoS Genetics |
| spelling | doaj-art-14409f794ede45839de2e448d4e27cb12025-08-20T02:12:23ZengPublic Library of Science (PLoS)PLoS Genetics1553-73901553-74042025-03-01213e101162410.1371/journal.pgen.1011624Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers.Matthew C FarnitanoKeith KarolyAndrea L SweigartHybridization among taxa impacts a variety of evolutionary processes from adaptation to extinction. We seek to understand both patterns of hybridization across taxa and the evolutionary and ecological forces driving those patterns. To this end, we use whole-genome low-coverage sequencing of 458 wild-grown and 1565 offspring individuals to characterize the structure, stability, and mating dynamics of admixed populations of Mimulus guttatus and Mimulus nasutus across a decade of sampling. In three streams, admixed genomes are common and a M. nasutus organellar haplotype is fixed in M. guttatus, but new hybridization events are rare. Admixture is strongly unidirectional, but each stream has a unique distribution of ancestry proportions. In one stream, three distinct cohorts of admixed ancestry are spatially structured at ~20-50m resolution and stable across years. Mating system provides almost complete isolation of M. nasutus from both M. guttatus and admixed cohorts, and is a partial barrier between admixed and M. guttatus cohorts. Isolation due to phenology is near-complete between M. guttatus and M. nasutus. Phenological isolation is a strong barrier in some years between admixed and M. guttatus cohorts, but a much weaker barrier in other years, providing a potential bridge for gene flow. These fluctuations are associated with differences in water availability across years, supporting a role for climate in mediating the strength of reproductive isolation. Together, mating system and phenology accurately predict fluctuations in assortative mating across years, which we estimate directly using paired maternal and offspring genotypes. Climate-driven fluctuations in reproductive isolation may promote the longer-term stability of a complex mosaic of hybrid ancestry, preventing either complete isolation or complete collapse of species barriers.https://doi.org/10.1371/journal.pgen.1011624 |
| spellingShingle | Matthew C Farnitano Keith Karoly Andrea L Sweigart Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers. PLoS Genetics |
| title | Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers. |
| title_full | Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers. |
| title_fullStr | Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers. |
| title_full_unstemmed | Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers. |
| title_short | Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers. |
| title_sort | fluctuating reproductive isolation and stable ancestry structure in a fine scaled mosaic of hybridizing mimulus monkeyflowers |
| url | https://doi.org/10.1371/journal.pgen.1011624 |
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