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Mammalian Biology

, Volume 70, Issue 5, pp 291–299 | Cite as

An exploratory analysis of geographic genetic variation in southern African nyala (Tragelaphus angasii)

  • J. P. GroblerEmail author
  • D. M. Pretorius
  • Karen Botha
  • Antoinette Kotze
  • E. M. Hallerman
  • Bettine Jansen Van Vuuren
Original investigation

Abstract

We report patterns of genetic variation based on microsatellite, allozyme and mitochondrial control region markers in nyala from geographic locations sampled in South Africa, Mozambique, Malawi and Zimbabwe. Highly significant differences were observed among allele frequencies at three microsatellite loci between populations from KwaZulu-Natal, Limpopo and Malawi, with the Malawi and KwaZulu-Natal groupings showing the highest differentiation (RST= 0.377). Allozyme frequencies showed minor, non-statistically significant regional differences among the South African populations, with maximum FST values of 0.048-0.067. Mitochondrial DNA analyses indicated a unique haplotype in each location sampled. Since none of these indices of population differentiation showed significant correlation to absolute geographic distance, we conclude that geographic variation in this species is probably a function of a distribution pattern stemming from habitat specificity. It is suggested that translocations among geographically distant regional populations be discouraged at present, pending a more elaborate investigation. Transfer of native individuals among local populations may, however, be required for minimizing the likelihood of inbreeding depression developing in small captive populations.

Keywords

Tragelaphus angasii evolutionary significant unit 

Genetische Variation bei Nyala (Tragelaphus angasii) im südafrikanischen Verbreitungsraum

Zusammenfassung

Unsere Studie befabßt sich mit Mustern der genetischen Variation in Nyala-Antilopen. Beprobt wurden die geographischen Standorte Südafrika, Mozambique, Malawi und Zimbabwe. Zwischen den untersuchten Populationen von Kwa Zulu Natal, Limpopo und Malawi wiesen die Allelfrequenzen in drei Mikrosatellitenloci höchst signifikante Unterschiede auf, wobei Malawi und Kwa Zulu Natal die höchste Differentiation (RST= 0.377) hervorbrachte. Allozymfrequenzen zeigten kleinere, statistisch nicht signifikante regionale Unterschiede unter den südafrikanischen Populationen mit maximalen FST-Werten von 0.048-0.067. Mitochondriale DNA-Analysen deuten in jeder Population auf einen einzigartigen Haplotyp hin. Da keine dieser Anzeichen für Populationsdifferenziation einen signifikanten Zusammenhang zur absoluten geographischen Distanz unterstützen, schlußfolgern wir, daß geographische Variation in dieser Spezies wahrscheinlich eine Funktion von Verteilungsmustern als Folge von Habitatspezifität darstellt. Von der Einführung habitatfremder Tiere ist bis zu einer detaillierteren Untersuchung abzuraten. Der Transfer einheimischer Individuen unter lokalen Populationen ist dagegen zu empfehlen, um mögliche Inzuchtdepressionen, für welche kleine in Gefangenschaft lebende Populationen anfa¨llig sind, zu minimieren.

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Copyright information

© Deutsche Gesellschaft für Säugetierkunde 2005

Authors and Affiliations

  • J. P. Grobler
    • 1
    Email author
  • D. M. Pretorius
    • 1
  • Karen Botha
    • 2
  • Antoinette Kotze
    • 2
  • E. M. Hallerman
    • 3
  • Bettine Jansen Van Vuuren
    • 4
  1. 1.Biodiversity, School of Molecular and Life SciencesUniversity of LimpopoSovengaSouth Africa
  2. 2.Animal Improvement InstituteAgricultural Research CouncilIreneSouth Africa
  3. 3.Department of Fisheries and Wildlife SciencesVirginia Polytechnic Institute and State UniversityBlacksburgUSA
  4. 4.Department of Botany and Zoology and DST Centre of Excellence for Invasion BiologyStellenbosch UniversityMatielandSouth Africa

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