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Journal of Mammalian Evolution

, Volume 4, Issue 1, pp 53–73 | Cite as

Mitochondrial DNA Phylogeography and Comparative Cytogenetics of the Springhare, Pedetes capensis (Mammalia: Rodentia)

  • C. A. Matthee
  • T. J. Robinson
Article

Abstract

Variation in mitochondrial DNA (mtDNA) was used together with comparative cytogenetics to examine the evolutionary history and taxonomic status of an African hystricomorphous rodent, the springhare Pedetes capensis. The mtDNA phylogeographic structure showed that the majority of the southern African populations (P. c. capensis) are characterized by unique but closely related maternal lineages. Based on restriction endonuclease fragment analysis, the east African populations (P. c. surdaster) appear more structured and are distinguished from those in southern Africa by an average sequence divergence of 5.52% (±1.4%). This marked divergence is concordant with results of the cytogenetic study. Specimens from southern Africa have 2n = 38, and those from east Africa 2n = 40. The change in diploid number is due to a single centric fusion. It is suggested that the closure of the Brachystegia or “miombo” woodland (20,000–10,000 B.P.), which delimits contemporary springhare ranges, may have been too recent to account for the accumulated genetic differences that distinguish these taxa. While rifting and associated habitat changes in east Africa can be invoked to explain genetic structure in this region, the southern African springhare populations, which have a high incidence of locality-specific haplotypes, show a shallow phylogeographic structure, in keeping with a relatively recent range expansion from smaller source populations. Given the magnitude of genetic, morphological, and ethological differences between the two geographic isolates, we believe that there is strong support for the elevation of the east African and southern African springhare populations to full species status, thus supporting earlier taxonomic treatments of this rodent.

springhare rodent mtDNA population structure chromosomes 

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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • C. A. Matthee
    • 1
  • T. J. Robinson
    • 1
  1. 1.Department of Zoology and EntomologyUniversity of PretoriaPretoriaSouth Africa

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