Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination

Peta Hill, Erik Wapstra, Tariq Ezaz, Christopher P. Burridge

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
22 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)5575-5583
Number of pages9
JournalEcology and Evolution
Volume11
Issue number10
DOIs
Publication statusPublished - May 2021

Fingerprint

Dive into the research topics of 'Pleistocene divergence in the absence of gene flow among populations of a viviparous reptile with intraspecific variation in sex determination'. Together they form a unique fingerprint.

Cite this