Plant Systematics and Evolution

, Volume 290, Issue 1, pp 115–125

Allozyme diversity levels in two congeneric Dioon spp. (Zamiaceae, Cycadales) with contrasting rarities

  • Dánae Cabrera-Toledo
  • Jorge González-Astorga
  • Fernando Nicolalde-Morejón
  • Francisco Vergara-Silva
  • Andrew P. Vovides
Original Article

DOI: 10.1007/s00606-010-0354-6

Cite this article as:
Cabrera-Toledo, D., González-Astorga, J., Nicolalde-Morejón, F. et al. Plant Syst Evol (2010) 290: 115. doi:10.1007/s00606-010-0354-6


Allozyme diversity and population genetic structure studies were conducted in populations of two Mexican cycad species occurring in adjacent and closely related biogeographic regions. We evaluated if rarity traits in Dioon caputoi, a micro-endemic species, and Dioon merolae, a regional endemic with a wider distribution, influence levels of genetic diversity in different ways. We also explored if genetic structure differs in these species, considering that they have similar population histories. Our results indicate that D. caputoi harbors lower levels of genetic diversity and allelic richness (HE = 0.358, P = 76.9, Ar = 1.86) than D. merolae (HE = 0.446, P = 92.3, Ar = 2). However, genetic structure does not differ between the two species despite their contrasting geographic distributions (FST = 0.06 vs. 0.07; D. caputoi and D. merolae, respectively). The comparison of population genetic structure information with historical and geographical aspects of the populations suggests that the rarity of D. caputoi might be due to relatively recent local ecological factors.


Allelic richnessBiogeographic historyDioon caputoiDioon merolaeGenetic structureHeterozygote excessZamiaceae

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Dánae Cabrera-Toledo
    • 1
  • Jorge González-Astorga
    • 2
  • Fernando Nicolalde-Morejón
    • 3
  • Francisco Vergara-Silva
    • 4
  • Andrew P. Vovides
    • 5
  1. 1.Laboratorio de Ecología y Evolución de Recursos Vegetales, Centro de Investigaciones en EcosistemasUniversidad Autónoma de México, Campus MoreliaMoreliaMexico
  2. 2.Laboratorio de Genética de Poblaciones, Red de Biología EvolutivaInstituto de EcologíaXalapaMexico
  3. 3.Instituto de Investigaciones BiológicasUniversidad VeracruzanaXalapaMexico
  4. 4.Laboratorio de Sistemática Molecular (Jardín Botánico), Instituto de BiologíaUniversidad Nacional Autónoma de MéxicoMexico D.F.Mexico
  5. 5.Laboratorio de Biología Evolutiva de Cycadales, Red de Biología EvolutivaInstituto de EcologíaXalapaMexico