Jeffrey R. Johansen
 Professor, Department of Biology
Telephone: 216-397-4487
Email: johansen@jcu.edu
Office: Dolan W 209
Research Website
B.S. Botany, Brigham Young University
M.S. Botany, Brigham Young University
Ph.D. Botany, Brigham Young University
Postdoc Microbiology and Public Health, Washington State University Postdoc Solar Energy Research Institute
Research Interests
I am interested in the taxonomy, ecology, and systematics of algae, and conduct work in freshwater lakes and rivers as well as subaerial habitats such as wet rock walls and soils. Although I work and publish on all algal phyla, my primary expertise and interest lie in the cyanobacteria and diatoms. With regards to cyanobacteria, I have been a part of the discovery and naming of several new genera and species, and my work is both in microscopical examination and sequencing of the 16S rRNA gene and the associated 16S-23S ITS region. I have also described new genera and species of diatoms, as well as published some diatom floras. My floristic survey work takes me and my students to many interesting places, such as Acadia National Park, Great Smoky Mountains National Park, Grand Staircase-Escalante National Monument, and the Atacama Desert in Chile. All of my work is collaborative in nature, and I enjoy working with students and faculty at John Carroll University as well as faculty and students at other universities in the USA and around the world.
Recent Courses
FYS-SEM - First Year Seminar
BL 159/BL 160 - Biodiversity
BL 445 - Aquatic Resources
BL 447 - Algae as Bioindicators
BL 560 - Biometry
Selected Publications
Lukešová, A., J.R. Johansen, M.P. Martin and D.A. Casamatta. 2009. Aulosira bohemensis sp. nov.: further phylogenetic uncertainty at the base of the Nostocales (Cyanobacteria). Phycologia 48:118-129.
Thomas, E.W., J.P. Kociolek, R.L. Lowe and J.R. Johansen. 2009. Taxonomy, ultrastructure and distribution of gomphonemoid diatoms (Bacillariophyceae) from Great Smoky Mountains National Park (U.S.A.). Nova Hedwigia, Beiheft 135:201-237.
Flechtner, V.R., J.R. Johansen and J. Belnap. 2008. The biological soil crusts of the San Nicolas Island: enigmatic algae from a geographically isolated ecosystem. Western North American Naturalist 68:405-436.
Johansen, J.R., J.P. Kociolek and R.L. Lowe. 2008. Spicaticribra kingstonii, gen. nov. et sp. nov. (Thalassiosiraceae, Bacillariophyta) from Great Smoky Mountains National Park, USA. Diatom Research 23: 367-375.
Segiesmund, M.A., J.R. Johansen, U. Karsten & T. Friedl. 2008. Coleofasciculus gen. nov. (Cyanobacteria): morphological and molecular criteria for revision of the genus Microcoleus Gomont. Journal of Phycology 44:1572-1585
Fučíková, K., J.D. Hall, J.R. Johansen and R.L. Lowe. 2008. Desmid flora of the Great Smoky Mountains National Park, USA. Bibliotheca Phycologica 113: 1-59.
Johansen, J.R., C.E. Olsen, R.L. Lowe, K. Fučíková & D.A. Casamatta. 2008. Leptolyngbya species from selected seep walls in the Great Smoky Mountains National Park. Algological Studies 126:21-36.
Kaštovský, J. & J.R. Johansen. 2008. Mastigocladus laminosus (Stigonematales, Cyanobacteria): phylogenetic relationship of the strains from thermal springs to the soil-inhabiting genera of the order, and taxonomic implications for the genus. Phycologia 47:307-320.
Miller, N. and J.R. Johansen. 2008. Observations on a diminutive form of Thalassiosira lacustris (Grunow) Hasle from Ohio. Nova Hedwigia, Beiheft 133:101-111.
Belnap, J., S.L. Phillips, J.E. Herrick and J.R. Johansen, 2007. Wind erodibility of soils at Ft. Irwin, CA (Mojave Desert) before and after trampling disturbance: Implications for land management: Earth Surface Processes and Landforms 32: 75-84.
Furey, P.C., R.L. Lowe & J.R. Johansen. 2007. Wet wall algal community response to in-field nutrient manipulation in the Great Smoky Mountains National Park, U.S.A. Algological Studies. 125:17-43.
Johansen, J.R. & R.L. Lowe. 2007. Draparnaldia appalachiana sp. nov. (Chaetophoraceae, Chlorophyceae) from the Great Smoky Mountains National Park. Algological Studies 123: 35-45.
Johansen, J.R., R.L. Lowe, S. Carty, K. Fučiková, C.E. Olsen, M.H. Fitzpatrick, J.A. Ress & P.C. Furey. 2007. New algal species records for the Great Smoky Mountains National Park, with an annotated checklist of all reported taxa from the park. Southeastern Naturalist, Special Issue: 1:99-134.
Lowe, R.L., P.C. Furey, J.A. Ress & J.R. Johansen. 2007. Diatom biodiversity and distribution on wetwalls in the Great Smoky Mountains National Park. Southeastern Naturalist, Special Issue: 1:135-152.
Řeháková, K., J.R. Johansen, D.A. Casamatta, L. Xuesong, & J. Vincent. 2007. Morphological and molecular characterization of selected desert soil cyanobacteria: Three species new to science including Mojavia pulchra gen. et sp. nov. Phycologia 46: 481-502.
Sgro, G.V., E.D. Reavie, J.C. Kingston, A.R.Kireta, M.J. Ferguson, N.P. Danz & J.R. Johansen. 2007. A diatom quality index from a diatom-based total phosphorus inference model. Environmental Bioindicators 2:15-34.
Sgro, G.V., J.B. Poole & J.R. Johansen. 2007. Diatom Species Composition and Ecology of the Animas River Watershed, Colorado, USA.” Western North American Naturalist 67: 510-519.
St. Clair, L.L., J.R. Johansen, S.B. St. Clair & K.B. Knight. 2007. The influence of grazing and other environmental factors on lichen community structure along an alpine tundra ridge in the Uinta Mountains, Utah, USA. Arctic, Antarctic, and Alpine Research 39: 603-13.
Casamatta D.A., S.R. Gomez and J.R. Johansen. 2006. Rexia erecta gen. et sp. nov. and Capsosira lowei sp. nov., two newly described cyanobacterial taxa from the Great Smoky Mountain National Park (USA). Hydrobiologia 561:13-26.
Jog, S.K., J.R. Johansen, M.K. Delong and D. Magee. 2006. Plant Communities of Highland heights community Park, Cuyahoga County, Ohio. Ohio Journal of Science 106:174-180.
Sgro, G.V., M. Ketterer and J.R. Johansen. 2006. Ecology and assessment of the benthic diatom communities of four Lake Erie estuaries using Lange-Bertalot Tolerance values. Hydrobiologia 561:239-249.
Casamatta D.A., J.R. Johansen, M.L. Vis & S.T. Broadwater. 2005. Molecular and ultrastructural characterization of ten polar and near-polar strains within the Oscillatoriales (Cyanobacteria). Journal of Phycology 41:421-438.
Delong, M.K., S.K. Jog, J.R. Johansen and G.J. Wilder. 2005. Floristic survey of a highly disturbed wetland within Shaker Median Park, Beachwood (Cuyahoga County), Ohio. Ohio Journal of Science 105:102-115.
Johansen, J.R. & D.A. Casamatta. 2005. Recognizing cyanobacterial diversity through adoption of a new species paradigm. Algological Studies 116:71-93.
Johansen, J.R., K. Fučíková, M.H. Fitzpatrick & R.L. Lowe. 2005. The red algal genus Rhodospora (Bangiophycidae, Rhodophyta): first report from North America. Journal of Phycology 41:1281-1283.
Jog, S.K., J.T. Kartesz, J.R. Johansen and G.J. Wilder. 2005. Floristic study of Highland Heights Community Park, Cuyahoga Co., Ohio. Castanea 70:136-145.
Nagy, M.L., J.R. Johansen, L.L. St. Clair & B.L. Webb. 2005. Impact of elevated arsenic on microbiotic soil crusts 70 years after contamination. Journal of Arid Environments 63:304-323.
Johansen, J.R., R.L. Lowe, S.R. Gomez, J.P. Kociolek and S.A. Makosky. 2004. New algal species records for the Great Smoky Mountains National Park, U.S.A., with an annotated checklist of all reported algal species for the park. Algological Studies 111:17-44.
George, D.B., B.A. Roundy, L.L. St. Clair, J.R. Johansen, G.B. Schaalje and B.L. Webb. 2003. The effects of microbiotic soil crusts on soil water loss. Arid Land Research and Management 17:113-125.
Gomez, S.R., J.R. Johansen, and R.L. Lowe. 2003. Epilithic Aerial Algae of Great Smoky Mountains National Park. Biologia, Bratislava 58:603-615.
Kubečková, K., J.R. Johansen, S.D. Warren, and R.L. Sparks. 2003. Development of immobilized cyanobacterial amendments for reclamation of microbiotic soil crusts. Algological Studies 109:341-362.
Neher, D.A., T.L. Walters, E. Tramer, T.R. Weicht, R.M. Veluci, K. Saiya-Cork, S. Will-wolf, J. Toppin, J. Traub and J.R. Johansen. 2003. Biological soil crust and vascular plant communities in a sand savanna of northwestern Ohio. Journal of the Torrey Botanical Society 130:244-252.
Rosati, T.C., J.R. Johansen and M.M. Coburn. 2003. Cyprinid fishes as samplers of benthic diatom communities in freshwater streams of varying water quality. Canadian Journal of Fisheries and Aquatic Sciences 60:117-125.
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