Skip to main content
Faculty Portrait

Contact Information

Name: Clayton J. Visger

Title: Assistant Professor

Office Location: HMB 211D

Email: clayton.visger [at]

Office Phone: 8-6791

Mailing Address: Sacramento State 6000 J Street Sacramento, CA 95819-6077

Office Hours: 9am - 1030am M/F

Courses That I Teach

Bio 1: Biodiversity, Evolution and Ecology

Bio 113: Evolution and Speciation in Flowering Plants

Bio 224: Genomics, Proteomics, and Bioinformatics

Research Projects/Interests

My research interests are in the evolutionary role of polyploidy, or whole-genome duplication, and how it functions as a speciation mechanism. I investigate the impact of polyploidy in flowering plants using genomic and bioinformatics methods, while drawing from the fields of physiology and ecology to place the findings into an evolutionary and ecological context.

Current funding:

2018 - 2021 NSF IOS 1754072 Collaborative Research: RUI: Understanding the effects of ploidal level on responses to global change in plants

2018 - 2020 New Investigator Grant Program, CSUPERB, Integrating synthetic RNA normalization with Ribo-seq to evaluate the genome-wide impact of polyploidy at the interface of the transcriptome and the translatome in Saccharomyces cerevisiae

For more information please visit the Visger Lab research page.


  • Folk, R.A., C.J. Visger, P.S. Soltis, D.E. Soltis, and R.P. Guralnick. 2018. Geographic range dynamics drove ancient hybridization in a lineage of angiosperms. The American Naturalist DOI: 10.1086/698120
  • Visger, C.J., G.K-S. Wong, Y. Zhang, P.S. Soltis, and D.E. Soltis. 2017. Using synthetic spike-in RNAs to quantify expression level divergence following autopolyploidy. 2017. bioRxiv DOI: 10.1101/169367
  • Soltis, D.E. and C.J. Visger. 2016. Polyploid speciation. Oxford bibliographies in evolutionary biology. Ed. Jonathan Losos. Oxford University Press. New York, New York, USA
  • Visger, C.J., C. Germain-Aubrey, M. Patel, P.S. Soltis, and D.E. Soltis. 2016. Niche divergence between diploid and autopolyploid Tolmiea. American Journal of Botany 103(2) DOI:10.3732/ajb.1600130
  • Soltis, D.E., C.J. Visger, D.B. Marchant, and P.S. Soltis. 2016. Polyploidy: Pitfalls and paths to a paradigm. American Journal of Botany DOI:10.3732/ajb.1500501
  • Crowl, A., N.W. Miles, C.J. Visger, K. Hansen, T. Ayers, R. Haberle, and N. Cellinese. 2016. A global perspective on Campanulaceae: Biogeographic, genomics, and floral evolution. American Journal of Botany 103(2) DOI:10.3732/ajb.1500450
  • Wolf, P.G., E.B. Sessa, D.B. Marchant, F-W. Li, C.J. Rothfels, E.M. Sigel, M.A. Gitzendanner, C.J. Visger, J.A. Banks, D.E. Soltis, P.S. Soltis, K.M. Pryer, and J.P. Der. 2015. An exploration into fern genome space. Genome Biology and Evolution 7(9) DOI:10.1093/gbe/evv163
  • Wolf, P.G., C.A. Rowe, J.P. Der, M.P. Schilling, Visger, C.J., and J.A. Thomson. 2015. Origins of Pteridium on Galapagos and other archipelagos. AoB Plants. 7 DOI:10.1093/aobpla/plv118
  • Servick*, S, C.J. Visger*, M.A. Gitzendanner, P.S. Soltis, and D.E. Soltis. 2015.  Population genetic variation, geographic structure, and multiple origins of autopolyploidy in Galax urceolata (Diapensiaceae). American Journal of Botany 102(6) DOI:10.3732/ajb.1400554        *Authors contributed equally
  • Crowl, A., C.J. Visger, G. Mansion, R. Hand, H. Wu, G. Kamari, D. Phitos, and N. Cellinese. 2015.  Evolution and biogeography of the endemic Roucela complex (Campanulaceae: Campanula) in the eastern Mediterranean. Ecology and Evolution 5(22) DOI:10.1002/ece3.1791
  • Mavrodiev, E.V, M. Chester, V.N. Suárez-Santiago, C.J. Visger, R. Rodriguez, A. Susanna, R.M. Baldini, P.S. Soltis, and D.E. Soltis. 2015. Multiple origins and chromosomal novelty in the allotetraploid Tragopogon castellanus (Asteraceae). The New Phytologist 206(3) DOI: 10.1111/nph.13227.
  • Soltis, D.E., C.J. Visger, and P.S. Soltis. 2014. The polyploidy revolution then...and now: Stebbins revisited. American Journal of Botany 101(7) DOI:10.3732/ajb.1400178       -Recommended by the Faculty of 1000
  • Soltis, P.S., X. Liu, D.B. Marchant, C.J. Visger, and D.E. Soltis. 2014. Polyploidy and novelty: Gottlieb’s legacy. Philosophical Transactions of the Royal Society B Biological Sciences 369(1648) DOI:10.1098/rstb.2013.0351