Steven G Johnson

Summary

Affiliation: University of New Orleans
Country: USA

Publications

  1. ncbi request reprint Population structure, parasitism, and survivorship of sexual and autodiploid parthenogenetic Campeloma limum
    S G Johnson
    Department of Biological Sciences, University of New Orleans, Louisiana 70148, USA
    Evolution 54:167-75. 2000
  2. ncbi request reprint Age, phylogeography and population structure of the microendemic banded spring snail, Mexipyrgus churinceanus
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA
    Mol Ecol 14:2299-311. 2005
  3. pmc Mode of origin differentially influences the fitness of parthenogenetic freshwater snails
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA
    Proc Biol Sci 272:2149-53. 2005
  4. ncbi request reprint Geographic ranges, population structure, and ages of sexual and parthenogenetic snail lineages
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana 70148, USA
    Evolution 60:1417-26. 2006
  5. pmc Spatial mosaic evolution of snail defensive traits
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA
    BMC Evol Biol 7:50. 2007
  6. pmc The effect of aquatic plant abundance on shell crushing resistance in a freshwater snail
    Johel Chaves-Campos
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana, United States of America
    PLoS ONE 7:e44374. 2012
  7. ncbi request reprint Contrasting patterns of synonymous and nonsynonymous sequence evolution in asexual and sexual freshwater snail lineages
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana 70148, USA
    Evolution 61:2728-35. 2007
  8. pmc Spatial geographic mosaic in an aquatic predator-prey network
    Johel Chaves-Campos
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana, United States of America
    PLoS ONE 6:e22472. 2011

Collaborators

Detail Information

Publications8

  1. ncbi request reprint Population structure, parasitism, and survivorship of sexual and autodiploid parthenogenetic Campeloma limum
    S G Johnson
    Department of Biological Sciences, University of New Orleans, Louisiana 70148, USA
    Evolution 54:167-75. 2000
    ..limum in the Atlantic coastal plain. Parthenogens may persist by higher dispersal rates into marginal habitats where there is a temporary escape from digenetic trematodes and competition with sexuals...
  2. ncbi request reprint Age, phylogeography and population structure of the microendemic banded spring snail, Mexipyrgus churinceanus
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA
    Mol Ecol 14:2299-311. 2005
    ..Migration rates between drainages indicate very little gene flow between drainages except for asymmetric migration from the Rio Mesquites into both western and southeastern drainages...
  3. pmc Mode of origin differentially influences the fitness of parthenogenetic freshwater snails
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA
    Proc Biol Sci 272:2149-53. 2005
    ..Given the considerable fitness advantages of parthenogens, especially hybrid parthenogens, it is enigmatic as to why these parthenogens occupy marginal natural habitats...
  4. ncbi request reprint Geographic ranges, population structure, and ages of sexual and parthenogenetic snail lineages
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana 70148, USA
    Evolution 60:1417-26. 2006
    ..In contrast to previous allozyme evidence for nonhybrid origins of diploid Campeloma parthenogens, cryptic hybridization may account for elevated heterozygosity...
  5. pmc Spatial mosaic evolution of snail defensive traits
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA
    BMC Evol Biol 7:50. 2007
    ....
  6. pmc The effect of aquatic plant abundance on shell crushing resistance in a freshwater snail
    Johel Chaves-Campos
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana, United States of America
    PLoS ONE 7:e44374. 2012
    ..Hence, we propose that a third trophic level could be important in the coevolution of snail defensive traits and predatory structures...
  7. ncbi request reprint Contrasting patterns of synonymous and nonsynonymous sequence evolution in asexual and sexual freshwater snail lineages
    Steven G Johnson
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana 70148, USA
    Evolution 61:2728-35. 2007
    ..These findings suggest that patterns of synonymous and nonsynonymous nucleotide polymorphism in asexual snail lineages may be shaped by both severe founder effect and relaxed purifying selection...
  8. pmc Spatial geographic mosaic in an aquatic predator-prey network
    Johel Chaves-Campos
    Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana, United States of America
    PLoS ONE 6:e22472. 2011
    ....