Johnson, Robert A.

ANT TAXONOMY
Dr. Johnson has broad research interests in the evolutionary ecology of North American seed-harvester ants. Dr. Johnson’s research focuses on life history, nest founding strategies, biogeography, community structure, and hybridization and caste determination, primarily using the seed-harvester ant genus Pogonomyrmex. Dr. Johnson’s interests also include the ant fauna of Baja California, Mexico, and adjacent areas of mainland Mexico. Brief descriptions of several larger ongoing projects follow.

PUBLICATIONS

 * [[Media:Johnson 1995.pdf|Johnson, R.A. 1995. Distribution and natural history of the workerless inquiline ant Pogonomyrmex anergismus Cole. Psyche 101 (1994): 257-262. [1995.] PDF]]


 * [[Media:Johnson R 2007.pdf|Johnson, R.A., Holbrook, C.T., Strehl, C. & Gadeau, J. 2007. Population and colony structure and morphometrics in the queen dimorphic harvester ant, Pogonomyrmex pima. Insectes Sociaux 54: 77-86. PDF]]


 * [[Media:Johnson R Overson R 2009.pdf|Johnson, R.A. & Overson, R.P. 2009. A new North American species of Pogonomyrmex from the Mohave Desert of Eastern California and Western Nevada. Journal of Hymenoptera Research 18: 305-314. PDF]]


 * [[Media:Johnson R 1996.pdf|Johnson, R.A., Parker, J.D. & Rissing, S.W. 1996. Rediscovery of the workerless inquiline ant Pogonomyrmex colei and additional notes on natural history. Insectes Sociaux 43: 69-76. [(31.xii).1996.] PDF]]


 * [[Media:Johnson & Rissing 1933.pdf|Johnson, R. A. and S. W. Rissing. 1993. Breeding Biology of the Desert Leaf-Cutter Ant Acromyrmex versicolor (Pergande) (Hymenoptera: Formicidae). Journal of the Kansas Entomological Society 66:127-128. PDF]]


 * [[Media:Johnson & Ward- 2002.pdf| Johnson, R. A.; Ward, P. S. 2002. Biogeography and endemism of ants (Hymenoptera: Formicidae) in Baja California, Mexico: a first overview. Journal of Biogeography 29:1009-1026. [2002-08] PDF]]


 * [[Media:Rabeling & Cover 2007.pdf|Rabeling C, Cover SP, Mueller UG & Johnson RA. 2007. A review of the North American species of the fungus-gardening ant genus Trachymyrmex (Hymenoptera: Formicidae). Zootaxa 1664:1-53. PDF]]


 * Johnson, R. A. 2015. A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part I. Zootaxa 4029(1):1-142