Genetic Structure of a Population of the Endangered Star Cactus (Astrophytum asterias) in Southern Texas Academic Article uri icon


  • We used data on alleles of seven polymorphic microsatellite loci in 142 individuals of the star cactus Astrophytum asterias from five subpopulations to estimate genetic parameters. Four of the subpopulations had high levels of heterozygosity and allelic diversity compatible with efficient outcrossing, and low FST-values that suggested high rates of gametic gene flow effected by winged-insect pollinators. The fifth subpopulation that was small and occupied the smallest area had low levels of heterozygosity and allelic diversity, which can be caused by small populations, inbreeding, geographic isolation, and founder effect. Our research indicated that all subpopulations, except one, were genetically suitable sources of propagules for reintroduction or for augmentation of other populations.

published proceedings

  • The Southwestern Naturalist

author list (cited authors)

  • Terry, M. K., Pepper, A. E., Strong, A. W., Tarin, D. M., Price, D. M., & Manhart, J. R.

publication date

  • January 1, 2012 11:11 AM