Extensive Population Structure Highlights an Apparent Paradox of Stasis in the Impala (Aepyceros melampus).
evolutionary stasis
impala
phylogeography
population genetics
whole genome sequencing
Journal
Molecular ecology
ISSN: 1365-294X
Titre abrégé: Mol Ecol
Pays: England
ID NLM: 9214478
Informations de publication
Date de publication:
07 Oct 2024
07 Oct 2024
Historique:
revised:
30
08
2024
received:
02
05
2024
accepted:
18
09
2024
medline:
7
10
2024
pubmed:
7
10
2024
entrez:
7
10
2024
Statut:
aheadofprint
Résumé
Impalas are unusual among bovids because they have remained morphologically similar over millions of years-a phenomenon referred to as evolutionary stasis. Here, we sequenced 119 whole genomes from the two extant subspecies of impala, the common (Aepyceros melampus melampus) and black-faced (A. m. petersi) impala. We investigated the evolutionary forces working within the species to explore how they might be associated with its evolutionary stasis as a taxon. Despite being one of the most abundant bovid species, we found low genetic diversity overall, and a phylogeographic signal of spatial expansion from southern to eastern Africa. Contrary to expectations under a scenario of evolutionary stasis, we found pronounced genetic structure between and within the two subspecies with indications of ancient, but not recent, gene flow. Black-faced impala and eastern African common impala populations had more runs of homozygosity than common impala in southern Africa, and, using a proxy for genetic load, we found that natural selection is working less efficiently in these populations compared to the southern African populations. Together with the fossil record, our results are consistent with a fixed-optimum model of evolutionary stasis, in which impalas in the southern African core of the range are able to stay near their evolutionary fitness optimum as a generalist ecotone species, whereas eastern African impalas may struggle to do so due to the effects of genetic drift and reduced adaptation to the local habitat, leading to recurrent local extinction in eastern Africa and re-colonisation from the South.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e17539Subventions
Organisme : Danmarks Frie Forskningsfond
ID : DFF-0135-00211B
Organisme : Danmarks Frie Forskningsfond
ID : DFF8049-00098B
Organisme : Carlsbergfondet
ID : CF21-0497
Informations de copyright
© 2024 The Author(s). Molecular Ecology published by John Wiley & Sons Ltd.
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