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Sci Rep. 2017 Apr 24;7(1):1091. doi: 10.1038/s41598-017-01104-9.

Limited genomic consequences of hybridization between two African clawed frogs, Xenopus gilli and X. laevis (Anura: Pipidae).

Author information

1
Biology Department, Life Sciences Building room 328, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada.
2
Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, Stellenbosch, South Africa.
3
Biology Department, Life Sciences Building room 328, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada. evansb@mcmaster.ca.
4
Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, Stellenbosch, South Africa. evansb@mcmaster.ca.

Abstract

The Cape platanna, Xenopus gilli, an endangered frog, hybridizes with the African clawed frog, X. laevis, in South Africa. Estimates of the extent of gene flow between these species range from pervasive to rare. Efforts have been made in the last 30 years to minimize hybridization between these two species in the west population of X. gilli, but not the east populations. To further explore the impact of hybridization and the efforts to minimize it, we examined molecular variation in one mitochondrial and 13 nuclear genes in genetic samples collected recently (2013) and also over two decades ago (1994). Despite the presence of F 1 hybrids, none of the genomic regions we surveyed had evidence of gene flow between these species, indicating a lack of extensive introgression. Additionally we found no significant effect of sampling time on genetic diversity of populations of each species. Thus, we speculate that F 1 hybrids have low fitness and are not backcrossing with the parental species to an appreciable degree. Within X. gilli, evidence for gene flow was recovered between eastern and western populations, a finding that has implications for conservation management of this species and its threatened habitat.

PMID:
28439068
PMCID:
PMC5430669
DOI:
10.1038/s41598-017-01104-9
[Indexed for MEDLINE]
Free PMC Article

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