Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination
Abstract Polymorphisms can lead to genetic isolation if there is differential mating success among conspecifics divergent for a trait. Polymorphism for sex‐determining system may fall into this category, given strong selection for the production of viable males and females and the low success of het...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-05-01
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| Series: | Ecology and Evolution |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ece3.7458 |
| _version_ | 1818949432953012224 |
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| author | Peta Hill Erik Wapstra Tariq Ezaz Christopher P. Burridge |
| author_facet | Peta Hill Erik Wapstra Tariq Ezaz Christopher P. Burridge |
| author_sort | Peta Hill |
| collection | DOAJ |
| description | Abstract Polymorphisms can lead to genetic isolation if there is differential mating success among conspecifics divergent for a trait. Polymorphism for sex‐determining system may fall into this category, given strong selection for the production of viable males and females and the low success of heterogametic hybrids when sex chromosomes differ (Haldane's rule). Here we investigated whether populations exhibiting polymorphism for sex determination are genetically isolated, using the viviparous snow skink Carinascincus ocellatus. While a comparatively high elevation population has genotypic sex determination, in a lower elevation population there is an additional temperature component to sex determination. Based on 11,107 SNP markers, these populations appear genetically isolated. “Isolation with Migration” analysis also suggests these populations diverged in the absence of gene flow, across a period encompassing multiple Pleistocene glaciations and likely greater geographic proximity of populations. However, further experiments are required to establish whether genetic isolation may be a cause or consequence of differences in sex determination. Given the influence of temperature on sex in one lineage, we also discuss the implications for the persistence of this polymorphism under climate change. |
| first_indexed | 2024-12-20T09:02:37Z |
| format | Article |
| id | doaj.art-5157736cdfd14dd5a54fac72fa4a6b90 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-12-20T09:02:37Z |
| publishDate | 2021-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-5157736cdfd14dd5a54fac72fa4a6b902022-12-21T19:45:49ZengWileyEcology and Evolution2045-77582021-05-0111105575558310.1002/ece3.7458Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determinationPeta Hill0Erik Wapstra1Tariq Ezaz2Christopher P. Burridge3Discipline of Biological Sciences University of Tasmania Sandy Bay Tas. AustraliaDiscipline of Biological Sciences University of Tasmania Sandy Bay Tas. AustraliaInstitute for Applied Ecology University of Canberra Bruce ACT AustraliaDiscipline of Biological Sciences University of Tasmania Sandy Bay Tas. AustraliaAbstract Polymorphisms can lead to genetic isolation if there is differential mating success among conspecifics divergent for a trait. Polymorphism for sex‐determining system may fall into this category, given strong selection for the production of viable males and females and the low success of heterogametic hybrids when sex chromosomes differ (Haldane's rule). Here we investigated whether populations exhibiting polymorphism for sex determination are genetically isolated, using the viviparous snow skink Carinascincus ocellatus. While a comparatively high elevation population has genotypic sex determination, in a lower elevation population there is an additional temperature component to sex determination. Based on 11,107 SNP markers, these populations appear genetically isolated. “Isolation with Migration” analysis also suggests these populations diverged in the absence of gene flow, across a period encompassing multiple Pleistocene glaciations and likely greater geographic proximity of populations. However, further experiments are required to establish whether genetic isolation may be a cause or consequence of differences in sex determination. Given the influence of temperature on sex in one lineage, we also discuss the implications for the persistence of this polymorphism under climate change.https://doi.org/10.1002/ece3.7458genetic sex determinationGSDNiveoscincussex chromosometemperature‐dependent sex determinationTSD |
| spellingShingle | Peta Hill Erik Wapstra Tariq Ezaz Christopher P. Burridge Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination Ecology and Evolution genetic sex determination GSD Niveoscincus sex chromosome temperature‐dependent sex determination TSD |
| title | Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination |
| title_full | Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination |
| title_fullStr | Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination |
| title_full_unstemmed | Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination |
| title_short | Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination |
| title_sort | pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination |
| topic | genetic sex determination GSD Niveoscincus sex chromosome temperature‐dependent sex determination TSD |
| url | https://doi.org/10.1002/ece3.7458 |
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