25a W. Waters Hall
Manhattan, KS 66506
Phone: 785-532-5588 Fax: 785-532-6232
Area(s) of Specialization:
Evolutionary Biology; Behavioral Ecology; Behavioral, Ecological, and Evolutionary Genomics; Speciation
EducationB.S. Biology and Chemistry, Piedmont College, Demorest, Georgia, 1994
M.S. Biological Sciences, University of Mississippi, Oxford, Mississippi, 1997
Ph.D. Environmental and Evolutionary Biology, University of Louisiana at Lafayette, Lafayette, Louisiana, 2000
Post Doctoral Associate Ecological and Evolutionary Genetics, New Mexico State University, 2000 - 2001
Evolution and Genomics/Proteomics of Adaptive Phenotypes
In the broadest sense, research in my laboratory focuses on the evolution of adaptive phenotypes – including traits related to fertilization success, behavior, and responses to environmental cues. We utilize a range of behavioral, ecological, and genetic/genomic/proteomic techniques to investigate these phenotypes and the processes that underlie their evolution. Currently, we are focusing on using comparative proteomics, RNAi, mating experiments, and natural hybrid zones to identify and functionally test the genes that underlie postmating, prezygotic reproductive isolation between species of cricket - specifically, the Allonemobius socius complex of cricket whose members are only isolated by such phenotypes (see below).
Speciation and the rapid evolution of barriers to fertilization in crickets
The Allonemobius socius complex of crickets consists of three species that have evolved from a common ancestor over the past 30,000 years. Parental genotypes are maintained within two separate hybrid zones (each involving different species pairs) even though the only barriers to gene exchange appear to be traits related to fertilization (e.g., conspecific sperm precedence and
the ability of males to induce females to lay eggs). Specifically, there are both competitive (conspecific sperm precedence) and non-competitive (a male’s ability to induce a female to lay eggs) gametic isolating barriers between these three species. These gametic isolation phenotypes are associated with species boundaries and evolving rapidly. Our current work is focusing on (1) identifying the molecular basis of these phenotypes, (2) determining how the underlying genes are evolving, and (3) studying/identifying phenotypes associated with male-female sexual conflict.
Traylor, T., A.C. Birand, J.L. Marshall, and D.J. Howard. 2008. A Zone of Overlap and Hybridization Between Allonemobius Socius and a New Allonemobius Sp. Annals of the Entomological Society of America 101:30-39.
Tribolium Genome Sequencing Consortium 2008. The genome of the model beetle and pest Tribolium castaneum. Nature 452:949-955.
Mutti, N. S., J. Louis, L. K. Pappan, K. Pappan, K. Begum, M-S. Chen, Y. Park, N. Dittmer, J. Marshall, J. C. Reese and G. R. Reeck (2008) A novel protein from the salivary glands of the pea aphid, Acyrthosiphon pisum, is essential in feeding on host plants. Proc. Nat. Aca. Sci. USA. 105: 965-9969
Camp, C.D., D.L. Huestis, and J.L. Marshall. Terrestrial versus aquatic phenotypes correlate with hydrological predictability of habitats in a semiterrestrial salamander (Urodela, Plethodontidae). Biological Jouranl of the Linnean Society 91: 227-238.
Britch, S.C., E.J. Swartout, D.D. Hampton, M.L. Draney, J. Chu, J.L. Marshall, and D.J. Howard. Genetic architecture of conspecific sperm precedence in Allonemobius fasciatus and A. socius. Genetics 176:1209-1222
Hayashi, T.I., J.L. Marshall and S. Gavrilets. 2007. The dynamics of sexual conflict over mating rate with endosymbiont infection that affects reproductive phenotypes. Journal of Evolutionary Biology 20: 2154-2164.
Marshall, J.L. 2007. Rapid evolution of spermathecal duct length in the Allonemobius socius complex of crickets: species, population and Wolbachia effects. PLoS One 2:e720.
Prabhakar, S., M-S. Chen, E.N. Elpidina, K.S. Vinokurov, C. M. Smith, J. L. Marshall, and B. Oppert. Sequence analysis and molecular characterization of larval midgut cDNA transcripts encoding peptidases from the yellow mealworm, Tenebrio molitor L. Insect Molecular Biology, 16: 455-468
Panaram. K. and J.L. Marshall. 2007. F-supergroup Wolbachia in bush crickets: what do patterns of sequence variation reveal about this supergroup and horizontal transfer between nematodes and arthropods? Genetica 130:53-60
Huestis, D.L. and J.L. Marshall. 2006. Is natural selection a plausible explanation for the distribution of Idh-1 alleles in the cricket Allonemobius socius? Ecological Entomology 31: 91-98
Marshall, J.L. and C.D. Camp. 2006. Environmental correlates of species and genetic richness in lungless salamanders (family Plethodontidae). Acta Oecologica-International Journal of Ecology 29: 33-44.
Huestis, D.L. and J.L. Marshall. 2006. Interaction between maternal effects and temperature affects diapause occurrence in the cricket Allonemobius socius . Oecologia 146: 513-520
Marshall, J.L. 2004. Allonemobius-Wolbachia host-endosymbiont system: Evidence for rapid speciation and against reproductive isolation driven by cytoplasmic incompatibility. Evolution 58: 2409-2425
Marshall, J.L., C. D. Camp and R. G. Jaeger. 2004. Potential interference competition between a patchily distributed salamander (Plethodon petraeus) and a sympatric congener (Plethodonglutinosus). Copeia 2004:488-495.
Howard, D.J., S.C. Britch, W.E. Braswell, and J.L. Marshall. 2004. Evolution in hybrid zones. In The Evolution of Population Biology. Pp. 297-314. (R. S. Singh and M.K. Uyenoyama, eds.), Cambridge University Press, Cambridge.
Marshall, J.L., M.L. Arnold, and D.J. Howard. 2003. Reinforcement with multiple mating. Trends in Ecology and Evolution 18:166.
Howard, D.J., J.L. Marshall, D.D. Hampton, S.C. Britch, M.L. Draney, J. Chu, and R.G. Cantrall. 2002. The genetics of reproductive isolation: a retrospective and prospective look with comments on ground crickets. American Naturalist 159:S8-S21.
Marshall, J.L., M. L. Arnold, and D. J. Howard. 2002. Reinforcement: the road not taken. Trends in Ecology and Evolution 17:558-563.
Howard, D.J., J.L. Marshall, W.E. Braswell, and J.A. Coyne. 2001. Examining evidence of reproductive isolation in sockeye salmon. Science 291:1853.
Camp, C.D., R.M. Austin, and J.L. Marshall. 2001. A model for the evolution of adult body size in black-bellied salamanders (Desmognathusquadramaculatus complex). Canadian Journal of Zoology 78:1712-1722.
Camp, C.D. and J.L. Marshall. 2001. The role of thermal environment in determining the life history of a terrestrial salamander. Canadian Journal of Zoology 78:1702-1711.