Recent Publications
Vogel, L. S. and S. G. Johnson. 2008. Estimation of hybridization and introgression frequency in toads (Genus: Bufo) using DNA sequence variation at mitochondrial and nuclear loci. Journal of Herpetology 42:61-75 .
Johnson, S. G. and R. S. Howard. 2007. Contrasting Patterns of Synonymous and Nonsynonymous Sequence Evolution in Asexual and Sexual Freshwater Snail Lineages. Evolution 11:2728-2735
Johnson, S. G., C. D. Hulsey, and F. J. García de León. 2007. Spatial mosaic evolution of snail defensive traits. BMC Evolutionary Biology 7:50 doi:10.1186/1471-2148-7-50.
Johnson, S. G. 2006. Geographic ranges, population structure and ages of sexual and parthenogenetic snail lineages. Evolution 60:1417-1426.
Johnson, S. G., 2005 Mode of origin differentially influences the fitness of parthenogenetic freshwater snails. Proc. Roy. Soc. Lond. B. 272:2149-2153.
Johnson, S.G. 2005. Age, phylogeography and population structure of the microendemic banded spring snail, Mexipyrgus churinceanus. Molecular Ecology 14:2299-2311.
Johnson, S.G. 2000. Population structure, parasitism and survivorship of sexual and parthenogenetic Campeloma limum (Gastropoda:Viviparidae). Evolution 54:167-175.
Johnson, S.G. and E. Bragg. 1999. Age and polyphyletic origins of hybrid and spontaneous parthenogenetic Campeloma (Gastropoda: Viviparidae) from the southeastern United States. Evolution 53:1769-1781.
Johnson, S.G. and W. Leefe. 1999. Clonal diversity and polyphyletic origins of hybrid and spontaneous parthenogenetic Campeloma (Gastropoda: Viviparidae) from the southeastern United States. Journal of Evolutionary Biology 12:1056-1068.