- Senior Global Futures Scientist, Julie Ann Wrigley Global Futures Laboratory
- Professor, School of Life Sciences, College of Liberal Arts and Sciences
- Affiliated Faculty, Center for Biodiversity Outcomes, Global Institute of Sustainability and Innovation
Day's research uses physiological and ecological approaches to determine how environmental factors influence the performance and distribution of plants and how these influences in turn alter the productivity and nutrient cycling at the whole-community or ecosystem level. Through field work and laboratory experiments, he investigates how environmental factors such as high levels of ultraviolet and visible light, extreme temperatures, and water stress limit plant performance under natural conditions. His concern is how these factors alter key processes such as photosynthesis, respiration, growth, reproduction, productivity, and nutrient cycling.
- PhD, Colorado State University, 1988
- MS, University of Idaho, 1985
- BS with distinction, Colorado State University, 1981
Day, T. A., R. Guénon and C. T. Ruhland. 2015. Photodegradation of plant litter in the Sonoran Desert varies by litter type and age. Soil Biology and Biochemistry 89(Oct):109-122. DOI: 10.1016/j.soilbio.2015.06.029. (link )
Elmendorf, S. C., G. H. Henry, R. D. Hollister, R. G. Björk, A. D. Bjorkman, T. V. Callaghan, L. Siegwart Collier, E. J. Cooper, J. H. Cornelissen, T. A. Day, A. Fosaa, W. A. Gould, J. Grétarsdóttir, J. Harte, L. Hermanutz, D. S. Hik, A. Hofgaard, F. Jarrad, I. Svala Jónsdóttir, F. Keuper, K. Klanderud, J. A. Klein, S. Koh, G. Kudo, S. I. Lang, V. Loewen, J. L. May, J. Mercado, A. Michelsen, U. Molau, I. H. Myers-Smith, S. F. Oberbauer, S. Pieper, E. Post, C. Rixen, C. H. Robinson, N. Martin Schmidt, G. R. Shaver, A. Stenström, A. Tolvanen, O. Totland, T. G. Troxler, C. Wahren, P. J. Webber, J. M. Welker and P. A. Wookey. 2012. Global assessment of experimental climate warming on tundra vegetation: Heterogeneity over space and time. Ecology Letters 15(2):164-175. DOI: 10.1111/j.1461-0248.2011.01716.x. (link )
Elmendorf, S. C., G. H. Henry, R. D. Hollister, R. G. Björk, N. Boulanger-Lapointe, E. J. Cooper, J. H. Cornelissen, T. A. Day, E. Dorrepaal, T. G. Elumeeva, M. Gill, W. A. Gould, J. Harte, D. S. Hik, A. Hofgaard, D. R. Johnson, J. F. Johnstone, I. Svala Jónsdóttir, J. C. Jorgenson, K. Klanderud, J. A. Klein, S. Koh, G. Kudo, M. Lara, E. Levesque, B. Magnusson, J. L. May, J. A. Mercado-Di'az, A. Michelsen, U. Molau, I. H. Myers-Smith, S. F. Oberbauer, V. G. Onipchenko, C. Rixen, N. Martin Schmidt, G. R. Shaver, M. J. Spasojevic, T. E. Thórhallsdóttir, A. Tolvanen, T. G. Troxler, C. E. Tweedle, S. Villareal, C. Wahren, X. Walker, P. J. Webber, J. M. Welker and S. Wipf. 2012. Plot-scale evidence of tundra vegetation change and links to recent summer warming. Nature Climate Change 2:453-457. DOI: 10.1038/nclimate1465. (link )
Strauss, S. L., F. Garcia-Pichel and T. A. Day. 2012. Soil microbial carbon and nitrogen transformations at a glacial foreland on Anvers Island, Antarctic Peninsula. Polar Biology 35(10):1459-1471. DOI: 10.1007/s00300-012-1184-5. (link )
Strauss, S. L., T. A. Day and F. Garcia-Pichel. 2011. Nitrogen cycling in desert biological soil crusts across biogeographic regions in the southwestern United States. Biogeochemistry 108(1):171-182. DOI: 10.1007/s10533-011-9587-x. (link )
Mueller, E. C. and T. A. Day. 2005. The effect of urban ground cover on microclimate, growth and leaf gas exchange of oleander in Phoenix, Arizona. International Journal of Biometeorology 49(4):244-255. DOI: 10.1007/s00484-004-0235-1. (link )
Day, T. A., P. Gober, F. Xiong and E. A. Wentz. 2002. Temporal patterns in near-surface CO2 concentrations over contrasting vegetation types in the Phoenix metropolitan area. Agricultural and Forest Meteorology 110(3):229-245. DOI: 10.1016/S0168-1923(01)00288-X. (link )
Wentz, E. A., P. Gober, R. C. Balling Jr and T. A. Day. 2002. Spatial patterns and determinants of winter atmospheric carbon dioxide concentratinos in an urban environment. Annals of the Association of American Geographers 92(1):15-28. DOI: 10.1111/1467-8306.00277. (link )
Grobe, T. A., C. T. Ruhland and T. A. Day. 1997. A new population of Colobanthus quitensis at Arthur Harbor, Antarctica: correlating recruitment with warmer temperatures.. Arctic and Alpine Research
McGraw, J. B. and T. A. Day. 1997. Size and characterization of a natural seed bank in Antarctica.. Arctic and Alpine Research
Day, T. A. and S. M. Demchik. 1996. Influence of enhanced UV-B radiation on biomass allocation and pigment concentrations in Brassica rapa. Vegetatio 109-116.
Day, T. A., B. W. Howells and C. T. Ruhland. 1996. Changes in growth and pigment concentrations with leaf age in pea under modulated UV-B field treatments.. Plant, Cell and Environmental 101-108.
Day, T. A. and J. B. McGraw. 1996. Ozone depletion, UV-B radiation and performance of Antarctic vascular plants. Antarctic Journal of the United States
Demchik, S. M. and T. A. Day. 1996. Effect of enhance UV-B radiation on pollen quantity, quality and seed yield in Brassica rapa.. American Journal of Botany 573-579.
Day, G. N., N. Cressie, S. S. Carroll and T. R. Carroll. 1995. Spatial modeling of snow water equivalent using airborne and ground-based data.. Environmetrics 127-139.
Day, T. A. and T. C. Vogelmann. 1995. Alterations in photosynthesis and pigment distributions in leaves following UV-B exposure.. Physiologia Plantarum 443-440.
Day, T. A. and T. C. Vogelmann. 1995. Alterations in photosynthesis and pigment distributions in pea leaves following UV-B exposure.. Physiologia Plantarum 433-440.
Day, T. A. and J. K. Detling. 1994. Water relations of Agropyron smithii and Bouteloua gracilis and community evapotranspiration following long-term grazing by prarie dogs.. American Midland Naturalist 381-392.
Day, T. A. 1993. Relating ultraviolet-B screening effectiveness of foliage to absorbing-compound concentration and anatomical characteristics in a diverse group of plants.. Oecologia 542-550.
Day, T. A. and J. K. Detling. 1990. Grassland patch dynamics and herbivore grazing preference following urine deposition. Ecology 180-188.
Martin, C. A., T. A. Day, J. M. Briggs, J. C. Stutz and M. R. Sommerfeld. 2001. Primary productivity at the CAP LTER. Poster presented at the January 19, 2001, CAP LTER Third Annual Poster Symposium, Center for Environmental Studies, Arizona State University, Tempe AZ. (link )
Mueller, E. C. and T. A. Day. 2000. Effects of urban ground cover on microclimate and landscape plant performance. Poster presented at 19 January 2000, CAP LTER Second Annual Poster Symposium, Center for Environmental Studies, Arizona State University, Tempe, AZ.
Vining, E. C., J. B. Gallaher and T. A. Day. 1999. Effects of urban ground cover on microclimate and landscape plant performance. Poster presented at the 22 January 1999, CAP LTER First Annual Poster Symposium, Center for Environmental Studies, Arizona State University, Tempe.