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John David Nason

John David Nason

  • Professor Emeritus
  • Former EEOB Department Chair
I am an evolutionary biologist who employs ecological and genetic approaches to infer evolutionary process. A unifying theme in my research is the use of molecular data to investigate of the factors influencing gene flow (or lack thereof) and their impacts on the structuring of genetic variation in plants and associated insects over a broad range of temporal and spatial scales. This theme is exemplified in our current research on figs-fig wasps, investigating geographic variation in mutualism "fitness" (seed and pollinator production) and how it is influenced by host population size, flowering phenology, and interactions with non-pollinating fig wasps, whose larvae parasitize fig fruit.

Area of Expertise: population genetics, molecular ecology, Evolutionary Biology

Teaching: Biological Evolution (BIOL 315)

Contact Info

251 Bessey
2200 Osborn Dr.


  • B.S., Biological Sciences, University of California, Davis, 1985
  • Ph.D., Botany and Plant Genetics, University of California Riverside, 1991