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Invasive Species Ecology

Invasive annual grasses are the greatest threat to shrub-grassland ecosystems of the Intermountain West. These grasses grow earlier in the season than native plants, usurping water and nutrients, and making survival and reproduction difficult for native species. They also change the fire regime within the ecosystem, creating more frequent and larger wildfires. We are attempting to understand the environmental conditions that may lead to the ultimate dominance of these annual grasses in order to provide early warning indicators before conversions from native shrub grasslands shift to annual grasslands.

Research Team

Restoration and Ecology of Arid Lands - Team Page

Primary Investigator

Pyke, David A. - View Profile

Related Publications

Pyke, D.A., Chambers, J.C., Beck, J.L., Brooks, M.L., Mealor, B.A., 2016, Land Uses, Fire, and Invasion- Exotic Annual Bromus and Human Dimensions - Chapter 11 In Germino, M.J., Chambers, J.C., Brown, C.S., eds., Exotic Brome-Grasses in Arid and Semiarid Ecosystems of the Western US: Causes, Consequences, and Management Implications: Switzerland, Springer International Publishing, p. 307-337,[Details]

Reisner, M., Doescher, P.S., Pyke, D.A., 2015, Stress gradient hypothesis explains susceptibility to Bromus tectorum invasion and community stability in North American semi-arid Artemisia tridentata wyomingensis ecosystems: Journal of Vegetation Science, v. 26, no. 6, p. 1212-1224,[Details]

Seabloom, E., Borer, E.T., Buckley, Y., Cleland, E.E., Davies, K.F., Firn, J., Harpole, S., Hautier, Y., Lind, E., MacDougall, A.S., Orrock, J.L., Prober, S.M., Adler, P.B., Anderson, T.M., Bakker, J.D., Biederman, L.A., Brown, C.S., Brudvig, L.A., Cadotte, M., Chu, C., Cottingham, K.L., Crawley, M.J., Damschen, E.I., Dantonia, C.M., DeCrappeo, N.M., Du, G., Fay, P.A., Frater, P., Gruner, D., Hagenah, N., Hector, A., Hillebrand, H., Hofmockel, K.S., Humphries, H., Jin, V.L., Kay, A., Kirkman, K.P., Klein, J.A., Knops, J.M., La Pierre, K.J., Ladwig, L.M., Lambrinos, J.G., Leakey, A.D., Li, Q., Li, W., Marushia, R., McCulley, R., Melbourne, B.A., Mitchell, C.E., Moore, J.L., Morgan, J.W., Mortensen, B., O'Halloran, L.R., Pyke, D.A., Risch, A.C., Sankaran, M., Schuetz, M., Simonsen, A., Smith, M., Stevens, C.J., Sullivan, L., Wolkovich, E., Wragg, P.D., Wright, J., Yang, L., 2015, Plant species' origin determines dominance and response to nutrient enrichment and herbivores in global grasslands: Nature Communications, v. 6, no. 7710, p. online,[Details]

Borer, E.T., Lind, E., Seabloom, E.W., MacDougall, A.S., Gruner, D., Anderson, T.M., Harpole, W.S., Biederman, L.A., Yang, L., Knops, J.M., Moore, J.L., Hillebrand, H., Damschen, E.I., Alberti, J., Daleo, P., Iribarne, O., Pascual, J., Hille Ris Lambers, J., Adler, P.B., Schuetz, M., Chu, C., Du, G., Sullivan, L., Williams, R.J., Stevens, C.J., Cadotte, M., Blumenthal, D., Mortensen, B., La Pierre, K.J., Bakker, J.D., Smith, M., Wright, J., Prober, S.M., McCulley, R., O'Halloran, L.R., Li, W., Brudvig, L.A., Mitchell, C.E., Brown, C.S., Heckman, R.W., DeCrappeo, N.M., Wragg, P.D., Pyke, D.A., Firn, J., Davies, K.F., Melbourne, B.A., Orrock, J.L., Hector, A., 2014, Herbivores and nutrients control grassland plant diversity via light limitation: Nature, v. 508, p. 517-520,[Details]

Witwicki, D.L., Doescher, P.S., Pyke, D.A., DeCrappeo, N.M., Perakis, S.S., 2013, Nitrogen limitation, 15N tracer retention, and growth response in intact and Bromus tectorum-invaded Artemisia tridentata ssp. wyomingensis communities: Oecologia, v. 171, no. 4, p. 1013-1023,[Details]

Mazzola, M.B., Chambers, J.C., Blank, R.R., Pyke, D.A., Schupp, E.W., Allcock, K.G., Doescher, P.S., Nowak, R.S., 2011, Effects of resource availability and propagule supply on native species recruitment in sagebrush ecosystems invaded by Bromus tectorum: Biological Invasions, v. 13, p. 513-526. [Details]

Firn, J., Moore, J.L., MacDougall, A.S., Borer, E.T., Seabloom, E.W., Hille Ris Lambers, J., Harpole, W.S., Cleland, E.E., Brown, C.S., Knops, J.M., Prober, S.M., Pyke, D.A., Farrell, K.A., Bakker, J.D., O'Halloran, L.R., Adler, P.B., Collins, S.L., D'Antonio, C., Crawley, M.J., Wolkovich, E., La Pierre, K.J., Melbourne, B.A., Hautier, Y., Morgan, J.W., Leakey, A.D., Kay, A., McCulley, R., Davies, K.F., Stevens, C.J., Chu, C., Holl, K.D., Klein, J.A., Fay, P.A., Hagenah, N., Kirkman, K.P., Buckley, Y., 2011, Abundance of introduced species at home predicts abundance away in herbaceous communities: Ecology Letters, p. online,[Details]

DeCrappeo, N.M., Pyke, D.A., Bottomley, P.J., 2010, Soil community dynamics in sagebrush steppe and cheatgrass-invaded areas of the northern Great Basin In Briggs, K.M., ed., Proceedings of the U.S. Geological Survey Interdisciplinary Microbiology Workshop, Estes Park, Colorado, October 15–17, 2008: Scientific Investigations Report 2010–5146, Reston, VA, U.S. Geological Survey, p. 7. [Details]

Pyke, D.A., 2010, To Burn or Not to Burn- A Framework to Answer the Question, Episode 8 (10.3 MB) USGS Oregon Science Podcast, Portland, OR. Prescribed burns are a common tool used by land managers to control invasive plant species and to promote native plants. There are many benefits to using a prescribed burn as a management tool; however, controlling fire is often difficult as it can be unpredictable. FRESC research ecologist Dave Pyke sat down with us to speak about a new framework that he has developed for land managers, which can be used to determine if fire is the appropriate strategy for controlling or enhancing specific plant species. [Details]

Brunson, J., 2008, Yield Responses of Invasive Grasses to Carbon Doses: Corvallis, OR, Oregon State University--M.S. Thesis, p. 69. [Details]

Hempy-Mayer, K., Pyke, D.A., 2008, Defoliation effects on Bromus tectorum seed production- Implications for grazing: Rangeland Ecology and Management, v. 61, p. 116-123. [Details]

Ponzetti, J., McCune, B., Pyke, D.A., 2007, Biotic soil crusts in relation to topography, cheatgrass and fire in the Columbia Basin, Washington: Bryologist, v. 110, no. 4, p. 706-722. [Details]

Perkins, L.B., 2006, Hydromulch Tackifier and Sucrose Effects on Microbial Nitrogen and Bromus tectorum Biomass: Corvallis, OR, Oregon State University--M.S. Thesis, p. 23. [Details]

Witwicki, D.L., 2005, Sugar Application and Nitrogen Pools in Wyoming Big Sagebrush Communities and Exotic Annual Grasslands -- M.S. Thesis: Corvallis, OR, Oregon State University, p. 59. [Details]

Brooks, M.L., D'Antonio, C.D., Richardson, D.M., Grace, J.B., Keeley, J.M., DiTomaso, J.M., Hobbs, R.J., Pellant, M., Pyke, D.A., 2004, Effects of invasive alien plants on fire regimes: BioScience, v. 54, no. 7, p. 677-688,[0677:EOIAPO]2.0.CO;2[Details]

Bekedam, S., 2004, Establishment Tolerance of Six Native Sagebrush Steppe Species to Imazapic (PLATEAU) Herbicide- Implications for Restoration and Recovery -- M.S. Thesis: Corvallis, OR, Oregon State University, p. 93. [Details]

Mayer, K.H., 2004, The Effects of Defoliation on Bromus tectorum Seed Production and Growth -- M.S. thesis: Corvallis, OR, Oregon State University, p. 54. [Details]

Harrison, K.S., 2003, Litter Decay Processes and Soil Nitrogen Availability in Native and Cheatgrass-dominated Arid Rangelands--M.S. Thesis: Corvallis, OR, Oregon State University, p. 63. [Details]

Brooks, M.L., Pyke, D.A., 2002, Invasive plants and fire in the deserts of North America In Galley, K.E., Wilson, T.P., eds., Proceedings of the invasive species workshop: The role of fire in the control and spread of invasive species. Fire Conference 2000: the First National Congress on Fire Ecology, Prevention, and Management: Misc. Publication No. 11, Tallahassee, FL, Tall Timbers Research Station, p. 1-14. [Details]

Laws, M.S., 2000, Control of Lepidium latifolium and Restoration of Native Grasses-- M.S. Thesis: Corvallis, OR, Oregon State University, p. 87. [Details]

Pyke, D.A., 1999, Monitoring weed populations in biocontrol projects[abs.]: Weed biocontrol: Extended abstracts from the 1997 Interagency Noxious-Weed Symposium, December 2-4, 1997, Corvallis, OR., p. 39-42. [Details]

Pyke, D.A., 1999, Invasive exotic plants in sagebrush ecosystems of the Intermountain West: U.S. Bureau of Land Management, Idaho State Office BLM/ID/PT-001001+1150, p. 43-54. [Details]

Francis, M.G., Pyke, D.A., 1997, Mixed-density designs for evaluating plant interactions during revegetation: Rangelands, v. 19, no. 1, p. 23-26. [Details]

Francis, M.G., Pyke, D.A., 1996, Crested wheatgrass-cheatgrass seedling competition in a mixed-density design: Journal of Range Management, v. 49, no. 5, p. 432-438. [Details]

Pyke, D.A., 1994, Ecological significance of seed banks with special reference to alien annuals: (Publisher} General Technical Report INT-GTR-313, p. 197-201. [Details]

Pyke, D.A., Novak, S.J., 1994, Cheatgrass demography-establishment attributes, recruitment, ecotypes, and genetic variability: U.S. Department of Agriculture, Forest Service, Intermountain Research Station General Technical Report INT-GTR-313, p. 12-21. [Details]

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