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  • Gibson, A.K., H. Baffoe-Bonnie, M.J. Penley, J. Lin, R. Owens, A. Khalid, and L.T. Morran. The evolution of parasite host range in genetically diverse host populations. Preprint at BioRxiv. DOI:


  • Chang, L., A.K. Gibson, P. Timper, L.T. Morran, and R.S. Tubbs (2019) Rapid change in host specificity in a field population of the biological control organism Pasteuria penetrans. In press at Evolutionary Applications.
  • Wernick, R.I., S.F. Christy, D.K. Howe, J.A. Sullins, J.F. Ramirez, M.E. Sare, M.J. Penley, L.T. Morran, D.R. Denver, and S. Estes. (2019) Sex and mitonuclear adaptation in experimental C. elegans populations. Genetics.
  • Hoang, K.L., N.M. Gerardo, and L.T. Morran. (2019) The effects of Bacillus subtilis on Caenorhabditis elegans fitness after heat stress. Ecology and Evolution.
  • Feistel, D.J., R. Elmostafa, N. Nguyen, M. J. Penley, L.T. Morran, and M.A. Hickman. (2019) A novel virulence phenotype rapidly assesses Candida fungal pathogenesis in healthy and immunocompromised Caenorhabditis elegans hosts. In press in mSpherePreprint at bioRxiv
  • Cutter, A.D., L.T. Morran, and P.C. Phillips. (2019) Males, outcrossing, and sexual selection in Caenorhabditis nematodes. In press in Genetics (WormBook chapter).
  • White, P.S., M.J. Penley, A. Paulk Tierney, D.M. Soper, and L.T. Morran. (2019) Dauer life stage of Caenorhabditis elegans induces elevated levels of defense against the parasite Serratia marcescens. Accepted in Scientific Reports.
  • Bhattacharya, A., V.C. Toro Díaz, L.T. Morran, and F. Bashey. (2019) Evolution of increased virulence is associated with decreased spite in the insect-pathogenic bacterium Xenorhabdus nematophila. Accepted in Biology Letters.


  • McMillan, J.R., R. Blakney, D. Mead, S. Coker, L.T. Morran, L. A. Waller, U. Kitron, and G. Vazquez-Prokopec. (2018) Larviciding Culex spp. populations in catch basins and its impact on West Nile virus transmission in urban parks in Atlanta, GA. Journal of Medical Entomology.
  • Penley, M. J., Greenberg, A. B., Khalid, A. , Namburar, S. R. and Morran, L. T. (2018) No measurable fitness cost to experimentally evolved host defense in the Caenorhabditis elegans‐Serratia marcescens host‐parasite system. J. Evol. Biol. Dec; 31(12): 1976-1981.  doi:10.1111/jeb.13372
  • Penley, M.J. and L.T. Morran. (2018) Assessment of Caenorhabditis elegans competitive fitness in the presence of a bacterial parasite. Bio-protocol. Vol. 8, Iss 16, Aug. 20. DOI:10.21769/BioProtoc.2971
  • Penley, M.J., & L.T. Morran (2018). Host mating system and coevolutionary dynamics shape the evolution of parasite avoidance in Caenorhabditis elegans host populations. Parasitology, 145 (6): 724-730.
  • Grossman, M., V. Uc-Puc, J. Rodriguez, D. Cutler, L.T. Morran, P. Manrique-Saide, and G. Vazquez-Prokopec. (2018) Restoration of pyrethroid susceptibility in a highly resistant Aedes aegypti population. Biology Letters. DOI: 10.1098/rsbl.2018.0022.
  • Lynch, Z. R., M.J. Penley, and L.T. Morran. (2018) Turnover in local parasite populations temporarily favors host outcrossing over self-fertilization during experimental evolution. Ecology and Evolution


  • Gibson, A.K. and L.T. Morran. (2017) A model for evolutionary ecology of disease: The case for Caenorhabditis nematodes and their natural parasites. Journal of Nematology. 49: 357-372.
  • Penley, M.J., G. Ha, and L.T. Morran (2017) Evolution of Caenorhabditis elegans host defense under selection by the bacterial parasite Serratia marcescens. PLoS ONE 12(8): e0181913.
  • Z.R. Lynch, T.A. Schlenke, L.T. Morran, J.C. de Roode (2017) Ethanol confers differential protection against generalist and specialist parasitoids of Drosophila melanogaster. PLoS One: 12(7) e0180182.
  • Yohei Matsunaga, Hyundoo Hwang, Barbara Franke, Rhys Williams, McKenna Penley, Hiroshi Qadota, Hong Yi, Levi T. Morran, Hang Lu, Olga Mayans, and Guy M. Benian. Twitchin kinase inhibits muscle activity. Mol. Biol. Cell 28, 1591-1600, 2017.


  • Hoang KL, Morran LT and Gerardo NM (2016) Experimental Evolution as an Underutilized Tool for Studying Beneficial Animal–Microbe Interactions. Front. Microbiol. 7:1444. 
  • Slowinski, S. P., Morran, L. T., Parrish, R. C., Cui, E. R., Bhattacharya, A., Lively, C. M. and Phillips, P. C. (2016), Coevolutionary interactions with parasites constrain the spread of self-fertilization into outcrossing host populations. Evolution. 70: 2632-2639.
  • Parrish II, R.C., Penley, M.J. and Morran, L.T., 2016. The Integral Role of Genetic Variation in the Evolution of Outcrossing in the Caenorhabditis elegans-Serratia marcescens Host-Parasite System. PloS one, 11(4), p.e0154463.
  • Morran, L. T., Penley, M. J., Byrd, V. S., Meyer, A. J., O’Sullivan, T. S., Bashey, F., Goodrich-Blair, H. and Lively, C. M. 2016. Nematode–bacteria mutualism: Selection within the mutualism supersedes selection outside of the mutualism. Evolution. 70: 687–695.


  • Gibson, A.K., K.S. Stoy, I.A. Gelarden, M.J. Penley, C.M. Lively, and L.T. Morran 2015. The evolution of reduced antagonism-A role for host-parasite coevolution. Evolution. 69: 2820-2830.


  • Morran, L.T., R. C. Parrish II, I. A. Gelarden, M.B. Allen, C. M. Lively. 2014. Experimental coevolution: rapid local adaptation by parasites depends on host mating system. Am Nat., 184: S91-S100.


  • Morran, L.T., R. C. Parrish II, I. A. Gelarden, C. M. Lively. 2013. Temporal dynamics of outcrossing and host mortality rates in host-pathogen experimental coevolution. Evolution. Jul; 67 (7): 1860-68.


  • Anderson J.L., R.M. Reynolds, L.T. Morran, J. Tolman-Thompson, P.C. Phillips. 2011. Experimental evolution reveals antagonistic pleiotropy in reproductive timing but not lifespan in Caenorhabditis elegans. J Gerontol A Biol Sci Med Sci. 66A (12):1300-1308.
  • Morran, L.T., O.G. Schmidt, I.A. Gelarden, R.C. Parrish II, C.M. Lively. 2011. Running with the Red Queen: Host-parasite coevolution selects for bi-parental sex. Science. Jul 8; 333 (6039): 216-8.


  • Morran, L.T., A. Ohdera, and P.C. Phillips. 2010. Purging deleterious mutations under self-fertilization: Paradoxical recovery in fitness with increasing mutation rate in Caenorhabditis elegans. PLoS ONE. 5(12): e14473.
  • Anderson J.L., Morran L.T., Phillips P.C. 2010. Outcrossing and the maintenance of males within C. elegans populations. J Hered. Mar-Apr; 101 Suppl 1: S62-74.


  • Morran L.T., Parmenter M.D., Phillips P.C. 2009. Mutation load and rapid adaptation favour outcrossing over self-fertilization. Nature. Nov 19; 462 (7271): 350-2.
  • Morran L.T., Cappy B.J., Anderson J.L., Phillips P.C. 2009. Sexual partners for the stressed: facultative outcrossing in the self-fertilizing nematode Caenorhabditis elegans. Evolution. Jun; 63 (6): 1473-82.