Erika Geiger, Ph.D.

Biography

Erika Geiger is a Supervisory Biologist at the USGS Canyonlands Research Station (CRS) in Moab, UT. She received her BA in Biology from the University of Colorado in Boulder in 1997 and her Masters in Range Management (2002) and PhD in Natural Resources (2006) from the University of Arizona. She has worked in primarily arid or seasonally water-stressed systems including mesquite savannas in southern Arizona and savannas in the central highlands of Brazil investigating the role of invasive species, fire, and disturbance on native vegetation in these systems. After returning to the U.S. from a postdoc in Brazil she switched from research to management and is currently the Station Manager at CRS.

 

 

Peer-reviewed publications

Hoffmann, W.A., Geiger, E.L., Gotsch, S., Rossatto, D.R., Silva, L.C.R., Lau, O.L., Haridasan, M., & Franco, A.C. (2012) Ecological thresholds at the savanna-forest boundary: How plant traits, resources and fire govern the distribution of tropical biomes. Ecology Letters 15:759-768.

Hoffmann, W.A., S.Y. Jaconis, K. McKinley, E.L. Geiger, S.G. Gotsch, and A.C. Franco. 2012Fuels or microclimate? Understanding the drivers of fire feedbacks at savanna-forest boundaries. Austral Ecology 37:634-643.

Geiger, E.L., Gotsch, S. G., Vale, G.D., Haridasan, M., and Franco, A.C., and Hoffmann, W.A. 2011Distinct roles of savanna and forest tree species in regeneration following fire suppression in a Brazilian savanna. Journal of Vegetation Science 22:312-321.

Vale, G.D., Geiger, E.L., Silva, L.C.R., and Hoffmann, W.A. In review. Distribuição espacial da comunidade arbórea na transição entre uma mata de galeria e cerrado sensu stricto, Distrito Federal: variações florísticas, regeneração natural e implicações para expansão florestal. Acta Botânica

Gotsch, S.G., E.L. Geiger, R. Meinzer, A.C. Franco., M. Haridasan and Hoffmann, W.A. In Press. Allocation to leaf area and sapwood area determines water relations of co-occurring savanna and forest trees. Oecologia 163:291–301

Hoffmann, W.A., Adasme, R., Haridasan, M., Pereira, M.A.B., Geiger, E.L., Carvalho, M.T., Gotsch, S.G., and A.C. Franco. 2009. Tree topkill, not mortality, governs the dynamics of alternate stable states at Brazilian savanna-forest boundaries under frequent fire. Ecology  90:1326-1337.

Huang, C. Y., E. L. Geiger, W. van Leeuwen, and S. Marsh. 2009. Discrimination of invaded and native species sites in a semi-desert grassland using MODIS multi-temporal data.International Journal of Remote Sensing 30:897-917.

Huang, C., and E. L. Geiger. 2008. Climate anomalies provide opportunities for large-scale mapping of non-native plant abundance in desert grasslands. Diversity & Distributions 14:875-884.

Schussman, H.R., Geiger, E.L., Mau-Crimmins, T.M., & Ward, J. 2006. Spread and current potential distribution of an alien grass, Eragrostis lehmanniana Nees, in the southwestern USA: comparing historical data and ecological niche models. Diversity and Distributions 12:582-592.               

Huang, C., Geiger, E.L., and Kupfer, J.A. 2006. Sensitivity of landscape metrics to classification scheme. International Journal of Remote Sensing 27:2927-2948.

Mau-Crimmins, T.M., Schussman, H.R., Geiger, E.L. 2006. Can an invading species’ distribution be predicted using data from its invaded range: Lehmann lovegrass (Eragrostis lehmanniana) in the southwestern United States. Ecological Modelling 193:736-746.

Geiger, E.L. and G.R. McPherson. 2005. Response of semi-desert grasslands invaded by non-native grasses to altered disturbance regime. Journal of Biogeography 32:895-902.

McLaughlin, S.P., GeigerE.L. and J.E. Bowers. 2001. Flora of The Appleton-Whittell National Audubon Society Research Ranch, Elgin, Arizona.  Journal of Arizona-Nevada Academy of Science 33:113-131.

 

 

Other publications

Albrecht, E.W., Geiger, E.L., Litt, A.R., McPherson, G.R., and Steidl, R.J. 2008. Fire as a tool to restore biodiversity in ecosystems dominated by invasive grasses. Department of Defense, Legacy Resource Management Program, Project 03-192, 165 pp.

Geiger, E.L. 2007. Grasslands at the Buenos Aires National Wildlife Refuge. Desert Plants 23(2):19.

Geiger, E. L. 2006. The role of fire and a nonnative grass as disturbances in semi‑desert grasslands of southeastern Arizona. Ph.D. Dissertation, University of Arizona, Tucson, Arizona, USA.

Geiger, E.L, T. Mau-Crimmins, E. Murdock, K. Lombardo, C. Sharp, E. Stitt, and G.R. McPherson. 2006. An evaluation of sites representing semi-desert grassland, Madrean woodland, and Madrean conifer forest in the Mojave-Sonoran Natural Region for their eligibility as National Natural Landmarks. National Park Service, Washington, D.C.

Mau-Crimmins, T., C. Sharp, K. Lombard, E.L. Geiger, and G.R. McPherson. 2006. An evaluation of sites representing semi-desert grassland and plains and Great Basin grassland in the Mojave-Sonoran Natural Region for their eligibility as National Natural Landmarks. National Park Service, Washington, D.C.

Stitt, E., C. Sharp, K. Lombardo, E. Murdock, T. Mau-Crimmins, E.L. Geiger, and G.R. McPherson. 2006. An evaluation of sites representing Madrean montane conifer forest and Madrean mixed-conifer forest in the Mojave-Sonoran Natural Region for their eligibility as National Natural Landmarks. National Park Service, Washington, D.C.

Geiger, E. L., and G. R. McPherson. 2005. No positive feedback between fire and a nonnative perennial grass. Pages 465-468 in G.J. Gottfried, B.S. Gebow, L.G. Eskew, and C.B. Edminster (compilers), Connecting Mountain Islands and Desert Seas: Biodiversity and Management of the Madrean Archipelago II. USDA Forest Service Rocky Mountain Research Station Proceedings RMRS-P-36