Population subdivision among desert bighorn sheep (Ovis canadensis) ewes revealed by mitochondrial DNA analysis

Walter M Boyce, R. R. Ramey, T. C. Rodwell, E. S. Rubin, R. S. Singer

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

We used behavioural observations and mitochondrial DNA (mtDNA) sequence analysis to examine demographic and genetic structure within and among home-range groups of desert bighorn sheep (Ovis canadensis) ewes in the Peninsular Ranges of southern California, USA. We identified substantial genetic variation in the first 515 bp of the mtDNA control region and determined that seven haplotypes were distributed in a nonrandom fashion among these ewe subpopulations. Although a significant (P < 0.01) amount of mtDNA variation (33%) was partitioned among home-range groups, we did not find strong evidence for matrilineal substructuring within these groups. Based on analyses of molecular variance, and comparisons of behavioural associations and distances between centres of activity, we concluded that within a given home-range group, bighorn sheep ewes generally associate with other ewes based on their availability rather than their matrilineal relationships. Our results also supported the conclusion that multiple ewe subpopulations exist within the Peninsular Ranges, and that these subpopulations are the most basic demographic and genetic units.

Original languageEnglish (US)
Pages (from-to)99-106
Number of pages8
JournalMolecular Ecology
Volume8
Issue number1
DOIs
StatePublished - Jan 1999

Keywords

  • Bighorn sheep
  • Genetic structure
  • Mitochondrial DNA
  • Social structure

ASJC Scopus subject areas

  • Ecology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

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