James L. Hamrick
Regents Professor
Plant Sciences, Rm 2512
Phone Number:  706-542-1826
Office/Lab:  Plant Sciences, Rm 2203
Phone Number: 

Ph.D Population Genetics, University of California - Berkeley 1970

Research Projects: 

My laboratory studies the genetics and evolution of natural plant populations. We are particularly interested in the genetic structure of plant populations and in those factors that influence the development of genetic structure; natural selection, the mating system, pollen movement and seed dispersal.

Grant Support: 
  • National Science Foundation. Interactive roles of Predation and Hybridization on Populations Dynamics of an Endangered Lupinus Species. 2008-2011.
  • National Science Foundation. Dissertation Research: Comparative phylogeography of neotropical trees. 2008-2009.
  • National Science Foundation. PIRE: Genetics of Invasive Species Exchanged Between the Southeastern U.S. and China, Taiwan and Hong Kong. 2007-2012.
  • US Department of Agriculture. Long term conservation of Crategus X sinica, a Valuable Medicinal Plant of the South Sinai Mountains. 2007-2009.
Of Note: 
  • National Academy of Sciences, U.S. National Committee for the International Union of the Biological Sciences (USNC/IUBS) 2000-2006
  • Distinguished Research Professor, University of Georgia, 2000-2008
  • Regents Professor, University of Georgia, 2008-present
  • Board of Directors, Organization for Tropical Studies, 2008-present
Selected Publications: 
  • Poelchau, M. F. and J. L. Hamrick. 2012. Comparative phylogeography of three common Neotropical tree species. J. Biogeog., in press.
  • Hamrick, J. L. and D. W. Trapnell. 2011. Using population genetic analyses to understand seed dispersal patterns. Acta Oecologia 37:641-649.
  • Chang, S-M., E. Gonzales, E. Pardini, and J. L. Hamrick. 2011. Encounters of old foes on a new battle ground for an invasive tree, Albizia julibrissin Durazz (Fabaceae). Biol. Invasions 13:1043-1053.
  • Fuchs, E. J. and J. L. Hamrick. 2011. Mating system and pollen flow between remnant populations of the endangered tropical tree, Guaiacum sanctum (Zygophyllaceae). Conserv. Genet. 12:175-185.
  • Hamrick, J. L. 2010. Pollen and seed movement in disturbed tropical landscapes. pp. 190-211. In DeWoody, J. A., J. W., Bickham, C. H. Michler, K. M. Nichols, O. E. Rhodes, and K. E. Woeste (eds) Molecular Approaches in Natural Resource Conservation and Management. Cambridge Univ. Press, New York.
  • Parker, K. C., D. W. Trapnell, J. L. Hamrick, W. C. Hodgson, and A. J. Parker. 2010. Inferring ancient Agave cultivation practices from contemporary genetic patterns. Mol. Ecol. 19:1622-1637.
  • Gonzales, E., J. L. Hamrick, P. E. Smouse, D. W. Trapnell, and R. Peakall. 2010. The impact of landscape disturbance on spatial genetic structure in the Guanacaste tree,Enterolobium cyclocarpum (Fabaceae). J. Hered. 101:133-143.
  • Hufford, K. M., J. L. Hamrick, and S. L. Rathbun. 2009. Male reproductive success at three early life stages in the tropical tree, Platypodium elegans. Int. J. Plant Sci. 170:724-734.
  • Gonzales, E., J.L. Hamrick, and P.E. Smouse. 2008. Comparison of clonal diversity in mountain and piedmont populations of Trillium cuneatum (Melanthiaceae-Trilliaceae), a forest understory species. Am. J. Bot. 95:1254-1261.
  • Pardini, E.A., and J.L. Hamrick. 2008. Inferring recruitment history from spatial genetic structure within populations of the colonizing tree, Albizia julibrissin (Fabaceae). Mol. Ecol. 17:2865-2879.
  • Gonzales, E., J.L. Hamrick, and S-M. Chang. 2008. Identification of glacial refugia in southeastern North America by phytogeographical analyses of a forest understory plant, Trillium cuneatum. J. Biogeography 35:844-852.
  • Dunphy, B.K. and J.L. Hamrick. 2007. Estimation of gene flow into fragmented populations of Bursera simaruba (Burseraceae) in the dry-forest life zone of Puerto Rico. Am. J. Bot. 94:1786-1794.
  • Parker, K. C., D. W. Trapnell, J. L. Hamrick, W. C. Hodgson, and A. J. Parker. 2010. Inferring ancient Agave cultivation practices from contemporary genetic patterns. Mol. Ecol. 19:1622-1637.
  • Pardini, E. A. and J. L. Hamrick. 2007. Hierarchical patterns of paternity within crowns of Albizia julibrissin (Fabaceae). Am. J. Bot. 94:111-118.
  • Trapnell, D. W. and J. L. Hamrick. 2006. Floral display and mating patterns within populations of the neotropical epiphytic orchid, Laelia rubescens (Orchidaceae). Am. J. Bot. 93:1010-1018.