UC San Diego SearchMenu

Oliver A. Ryder


Challenges involved in conserving biological diversity include addressing the numerous scientific issues limiting our understanding of the Earth's biota. Speciation and species diversity, the role of genetic variation in population persistence, its rate of generation and loss in different taxonomic groups and under different ecological conditions, as well as the development of tools for addressing these questions are all significant topics in biology pertinent to conservation issues. The genetics group at the CRES (Center for Reproduction of Endangered Species - a division of the Zoological Society of San Diego) undertakes comparative cytogenetic and molecular genetics studies involving a diverse array of species suitable as models for investigating relative rates of evolution among different taxa, population structure and systematics. Additionally, research pertinent to planning and management for selected mammalian, reptilian and avian species of conservation concern is undertaken utilizing appropriate techniques, including the development and application of new methodologies. Current emphases include molecular evolutionary and population studies involving analysis of nuclear microsatellite allelic variation and nucleotide sequence analysis of mitochondrial genomes. Assessment, planning, monitoring, and management of small populations for conservation will benefit from application of more effective methods of collection and analysis of genetic data. An increased understanding of many threatened species at the cytogenetic and molecular genetic level will contribute to gene pool conservation strategies and management as well as establishing a broader knowledge of the dynamics of genome evolution. Located in lab facilities on the grounds of the San Diego Zoo, our studies are facilitated by unique resources, including cell lines and other biological samples that are available as a result of the animal collections of the San Diego Zoo and Wild Animal Park as well as through associated field activities of CRES staff.

Ryder Image

Black rhinoceros male in Masia Mara Reserve in Kenya. Increased knowledge of genetics of black rhinos contributes to monitoring and recovery efforts for this endangered species.


  • Field, D., Chemnick, L., Robbins, M., Garner, K. and Ryder, O.A. (1998). Paternity determination in captive lowland gorillas and orangutans and wild mountain gorillas by microsatellite analysis. Primates 39:199-209.
  • Burrows, W. and Ryder, O.A. (1997). Y-chromosome variation in great apes. Nature 385:125-126.
  • Garner, K.J. and Ryder, O.A. (1996). Mitochondrial DNA diversity in gorillas. Molec. Phyl. Evol. (In press).
  • Zhang, Y. and Ryder, O.A. (1995). Different rates of mitochondrial DNA sequence evolution in Kirk's dik-dik (Madoqua kirkii) populations. Mol. Phyl. Evol. 4:291-297.
  • Ryder, O. A. and Feistner, A.T.C. (1995). Research in zoos: a growth area in conservation. Biodiversity and Conservation 4: 671-677.
  • Zhang, Y. and Ryder, O.A. (1993). Mitochondrial DNA sequence evolution in the Arctoidea. Proc. Natl. Acad. Sci. USA 90: 9557-9561.


Oliver A. Ryder received his Ph.D. from UCSD. He is the geneticist and recipient of the Kleberg Genetics Chair at the Center for Reproduction of Endangered Species, Zoological Society of San Diego. He is a member of Specialist Groups of the Species Survival Commission of World Conservation Union: Equid Specialist Group, Captive Breeding Specialist Group, and Re-introduction Specialists Group. Dr. Ryder is an associate editor of the Journal of Heredity.