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

 * Anderson, K.E., Gadau, J., Mott, B.M., Johnson, R.A., Altamirano, A., Strehl, C., Fewell, J.H. 2006. Distribution and evolution of genetic caste determination in Pogonomyrmex seed-harvester ants. Ecology 87:2171-2184.
 * Gray, K.W., Cover, S.P.; Johnson, R.A., Rabeling, C. 2018. The dacetine ant Strumigenys arizonica, an apparent obligate commensal of the fungus-growing ant Trachymyrmex arizonensis in southwestern North America. Insectes Sociaux 65:401-410.
 * Helms Cahan, S., Parker, J.D., Rissing, S.W., Johnson, R.A., Polony, T.S., Weiser, M.D., Smith, D.R. 2002. Extreme genetic differences between queens and workers in hybridizing Pogonomyrmex harvester ants. Proceedings of the Royal Society of London. Series B, Biological Sciences 269:1871-1877.
 * [[Media:Johnson 1995.pdf|Johnson, R.A. 1995. Distribution and natural history of the workerless inquiline ant Pogonomyrmex anergismus Cole. Psyche 101, 257-262.]]
 * Johnson, R.A. 2000. Seed-harvester ants (Hymenoptera: Formicidae) of North America: an overview of ecology and biogeography. Sociobiology 36:89-122 + 83-88.
 * Johnson, R.A. 2000. Seed harvesting species of Pheidole (Hymenoptera: Formicidae). Sociobiology 36:597.
 * Johnson, R.A. 2001. Biogeography and community structure of North American seed-harvesting ants. Annual Review of Entomology 46:1-29.
 * [[Media:Johnson, 2015.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.]]
 * [[Media:Johnson, R.A. 2021. A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex. Part II (10.11646@zootaxa.5033.1.1).pdf|Johnson, R.A. 2021. A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II. Zootaxa 5033, 1–230]].
 * Johnson, R.A., Parker, J.D., Rissing, S.W. 1996. Rediscovery of the workerless inquiline ant Pogonomyrmex colei and additional notes on natural history (Hymenoptera: Formicidae). Insectes Sociaux 43:69-76.
 * Johnson, R.A., Cover, S.P. 2015. A taxonomic revision of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae) on Hispaniola. Zootaxa 3972(2), 231-249.
 * [[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.]]
 * Johnson, R.A., Moreau, C.S. 2016. A new ant genus from southern Argentina and southern Chile, Patagonomyrmex (Hymenoptera: Formicidae). Zootaxa 4139:1-31. 10.11646/zootaxa.4139.1.1 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.]]
 * [[Media:Johnson et al 2013.pdf|Johnson, R.A., Overson, R.P., Moreau, C.S. 2013. A new species of seed-harvester ant, Pogonomyrmex hoelldobleri (Hymenoptera: Formicidae), from the Mohave and Sonoran deserts of North America. Zootaxa 3646, 201-227.]]
 * [[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.]]]
 * Julian, G.E., Fewell, J.H., Gadau, J., Johnson, R.A., Larrabee, D. 2002. Genetic determination of the queen caste in an ant hybrid zone. Proceedings of the National Academy of Sciences of the United States of America 99: 8157-8160.
 * [[Media:Johnson & Rissing 1933.pdf|Johnson, R.A., Rissing, S.W. 1993. Breeding biology of the desert leaf-cutter ant Acromyrmex versicolor (Pergande) (Hymenoptera: Formicidae). Journal of the Kansas Entomological Society 66, 127-128.]]
 * Longhurst, C., Johnson, R.A., Wood, T.G. 1979. Foraging, recruitment and predation by Decamorium uelense (Santschi) (Formicidae: Myrmicinae) on termites in southern Guinea Savannah, Nigeria. Oecologia (Berlin) 38: 83-91.
 * Parker, J.D., Dowling, T.E., Johnson, R.A., Rissing, S.W. 1998. Evolutionary origins of the ant social parasites of the North American seed harvester ants Pogonomyrmex. [Abstract.]. P. 361 in: Schwarz, M. P.; Hogendoorn, K. (eds.) 1998. Social insects at the turn of the millennium. Proceedings of the XIII International Congress of IUSSI. Adelaide, Australia. 29 December 1998 - 3 January 1999. Adelaide: XIII Congress of IUSSI, 535 pp.
 * Plowes, N.J.R., Johnson, R.A., Hölldobler, B. 2013. Foraging behavior in the ant genus Messor (Hymenoptera: Formicidae: Myrmicinae). Myrmecological News 18: 33-49.
 * [[Media:Rabeling & Cover 2007.pdf|Rabeling, C., Cover, S.P., Mueller, U.G., Johnson, R.A. 2007. A review of the North American species of the fungus-gardening ant genus Trachymyrmex (Hymenoptera: Formicidae). Zootaxa 1664, 1-53.]]
 * van Elst, T., Eriksson, T.H., Gadau, J., Johnson, R.A., Rabeling, C., Taylor, J.E., Borowiec, M.L. 2021. Comprehensive phylogeny of Myrmecocystus honey ants highlights cryptic diversity and infers evolution during aridification of the American Southwest. Molecular Phylogenetics and Evolution 155: 107036.