Abstract

The analyses of Plio-Pleistocene speciation processes in the Horn of Africa are relevant for understanding the evolution of biodiversity patterns of this understudied part of the world. Here we analyse comprehensive genomic and morphological data of the recently delimited murid genus Ochromyscus, one of the few with Afro-Arabian distribution. Using an integrative taxonomic approach, we delimit three species in the genus: two in eastern Africa (O. brockmani and O. niveiventris) and one in southern Arabia (O. yemeni), and detail their distribution, genetic structure, and evolutionary history. Despite their morphological similarity, the three species split before the Pleistocene, and their interspecific genetic divergence level is comparable to that between sister genera of murine rodents. The split between two taxa living on opposite sides of the Red Sea (O. brockmani vs. O. yemeni) is younger than the separation of their ancestor and O. niveiventris living in eastern Africa. The colonization of Arabia can be explained either by the presence of a relatively recent continental bridge or by the past occurrence of the genus along the eastern coast of the Red Sea and subsequent spreading through the Sinai Peninsula.

Keywords

ddRAD; Horn of Africa; integrative taxonomy; phylogeography; rodents; Somali-Masai savanna

Published in

Zoological Journal of the Linnean Society
2023,
Publisher: OXFORD UNIV PRESS

SLU Authors

• Meheretu, Yonas

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    
  • Mekelle University
  • The Czech Academy of Sciences

UKÄ Subject classification

Zoology
Biological Systematics


Publication identifier

DOI: https://doi.org/10.1093/zoolinnean/zlad158

Permanent link to this page (URI)

https://res.slu.se/id/publ/126742