Department
of Renewable Resources Tel:
307-766-2494
University
of Wyoming Fax:
307-766-6403
Laramie,
WY 82071 Email:
dgw@uwyo.edu
BA
- 1985 Botany,
The University of Texas, Austin
MS
- 1988 Range
Science, Texas A&M University, College Station
Thesis title: Extent and
ecological significance of physiological integration among ramets within the
bunchgrass Schizachyrium scoparium var. frequens. (Advisor � David D. Briske)
PhD
- 1992 Botany,
Washington State University, Pullman
Dissertation title:
Physiological ecology of the invasive grass Pennisetum setaceum on Hawaii. (Advisors � Richard
N. Mack and R. Alan Black)
Stable isotope ecology, applied plant ecology, plant
physiological ecology, plant water relations, carbon and water cycles in arid
and semi-arid environments, ecology of plant invasions, global change ecology
2002-present Associate
Professor, Departments of Renewable Resources and Botany,
University
of Wyoming
2002-present Adjunct
Associate Professor, School of Renewable Resources,
University
of Arizona
2002-present Director,
University of Wyoming Stable Isotope Facility,
University
of Wyoming
2002-2003 Fulbright
Research Fellow, Centre d�Etudes Spatiales de la Biosphere,
Toulouse,
France
2001-2002 Associate
Professor, School of Renewable Natural Resources,
University
of Arizona
1995-2001 Assistant
Professor, School of Renewable Natural Resources,
University
of Arizona
1993-1995
Postdoctoral
Research Fellow, Department of Biology, University of Utah
1988-1992 Teaching/Research
Assistant, Departments of Botany and Biology,
Washington
State University
1985-1988 Teaching/Research
Assistant, Departments of Range Science and Biology,
Texas
A&M University
Honors and Awards
Phi
Kappa Phi, 1988
Sigma
Xi Graduate Research Award, 1990
Biddulph
Graduate Student Fellowship in Botany, Washington State University, 1991
United
States Department of Agriculture, National Research Initiative Competitive
Grants Program, New Investigator Award, 1996
United
States Department of Agriculture, Group Honor Award for Excellence, 2001
Fulbright
Research Scholar Award for France, 2002-2003
Professional
society memberships
Ecological
Society of America
American
Geophysical Union
Society
for Range Management
Williams, D.G. Water use along a semi-arid riparian continuum.
USDA-NRI, $97,242, 1996-1999.
Williams, D.G. Effect of grass invasion on soil carbon and nitrogen
dynamics. University of Arizona Faculty Small Grant Program, $5,000, 1996-1997.
Williams, D.G. Alien grass invasion and ecosystem feedbacks in
southern Arizona. Agricultural Experiment Station/Hatch. $38,640, 1996-1999.
Goodrich, D., D. Cooper, J.L. Dwyer, L. Hipps, T. Maddock, III, S.
Moran., D.E. Myers, E. Njoku, J. Schieldge, D.I. Stannard, and D.G. Williams.
Water resources management to sustain growth and riparian biodiversity: In-situ
and remote measurements of riparian corridor evapotranspiration. NASA, $154,372,
1996-1998.
McPherson, G., M. McClaran, and D.G. Williams. An interactive
computer instructional environment for interrelated courses. University of
Arizona Teaching Center, $5,400, 1997-1998.
Leavitt, S., M.J. Ottman, A.D. Matthias, T.L. Thompson, D.G.
Williams, and R.L. Roth. Elevated CO2 and limited water supply
effects on carbon processes and sequestration in C4 grass. USDA-NRI,
$505,700, 1997-2000.
Williams, D.G. Isotopic indicators of CO2 and H2O
fluxes in semi-arid ecosystems. University of Arizona Research Development
Funds competitive grant; $20,000, 1998-2000.
Leavitt, S. and D.G. Williams. Visiting scholar fund for the
Institute for the Study of Planet Earth. University of Arizona, $1,312, 1998.
Goodrich, D. and D.G. Williams. Ephemeral channel deep recharge and
evapotranspiration from near-channel vegetation. Cochise County, AZ, $70,163,
1998-2000.
Williams, D.G., K. Hultine, D.G. Goodrich. Isotope biohydrology of
an ephemeral drainage. USGS/Water Resources Research Center competitive grant,
$13,724, 1999-2000.
Webb, R.H., D. Meko, and D.G. Williams. Surface water/groundwater
dependence of riparian trees: A synthetic dendrohydrology and ecophysiology
study. USGS-Groundwater Project, $150,000, 1999-2002.
Williams, D.G., D.L. Dettman, S.W. Leavitt, T.A. Markow, C.M. del
Rio. An isotope ratio mass spectrometer for the biological sciences at the
University of Arizona. NSF, $189,000, 2000-2001.
Weltzin, J., and D.G. Williams. Climate change, grass invasions, and
woody plant dynamics in semi-arid savannas. USDA-NRI, $300,000, 2000-2003.
Williams, D.G. Interactions between mesquite and Lehmann lovegrass:
geomorphic controls on plant and soil water balance. Agricultural Experiment
Station/Hatch, $18,000, 2000-2003.
Williams, D.G. Integrated measurement and modeling of
hydro-ecological resources in Morocco. $4,885, University of Arizona Faculty
Small Grant Program, 2001-2002.
Goodrich, D., R. Scott, D.G. Williams, N. Grimm, M. Conklin, and J.
Stromberg. San Pedro Riparian National Conservation Area Water Needs Study.
$823,894, BLM-Upper San Pedro Partnership, 2001-2005.
Williams, D.G., D. Goodrich, R. Scott, and G. Lin. Relationship
between hydrologic condition and plant transpiration and carbon exchange.
$109,190 (year 1). 2001-2003. NSF-SAHRA Science and Technology Center.
Williams, D.G. Integrated measurement and modeling of
hydro-ecological resources in semi-arid regions. $22,000. Fulbright Scholar
Program, France. 2002-2003.
Williams, D.G. and S.E. Williams. Collaborative Isotopic Studies in
Steppe Ecosystems of Inner Mongolia and Wyoming. $1,500. University of Wyoming,
College of Agriculture Global Perspectives Grant. 2004.
Williams, D.G. Net
carbon exchange and evapotranspiration in sagebrush steppe: response to extreme
summer rainfall events. $8,000. Wyoming NASA Space Grant Consortium. 2004.
Williams, D.G. Collaborative Isotopic Studies in Steppe Ecosystems
of Inner Mongolia and Wyoming. $1,035. University of Wyoming International
Program Travel Grant. 2004.
Williams, D.G.,
M. Ben-David, R.O. Hall, C. Martinez del Rio and E. Pendall. Isotope ratio mass
spectrometers for biological and environmental research and training at the
University of Wyoming. $409,042 total, $270,042 external. NSF (DBI-0400752).
2004-2005.
Williams, D.G. Collaborative Research: Sensitivity of ecosystem processes to
precipitation across a grassland to shrubland vegetation transition in the
southwestern US. $224,000. NSF (DEB-0414680). 2004-2007.
Williams, D.G. Collaborative Research: Vulnerability of semi-arid
grasslands to encroachment by woody plants: the role of grass invasions,
seasonal precipitation, and soil type. $109,496. NSF (DEB-0417228). 2004-2007.
Williams, D.G. Travel Grant for BASIN
Williams, D.G. and E. Pendall. How will grassland ecosystems respond
to rising CO2 and climate change? $130,000. USDA-ARS subcontract
cooperative agreement. 2004-2009.
Sharma, S. and D.G. Williams. Volcanic degassing in Yellowstone
National Park: An un-tapped research opportunity for studying effects of
elevated CO2 on coniferous forest. $7,500. University of Wyoming
Faculty Grant-in-Aid. 2006-2007.
Publications
(*students and
postdocs mentored by Williams)
Book chapters
Ehleringer, J.R., R.D. Evans,
and D. Williams. 1998. Assessing sensitivity to change in desert ecosystems - a
stable isotope approach. Pages 223-237.
In H. Griffiths (ed.), Stable Isotopes Integration of Biological,
Ecological, and Geochemical Processes. BIOS
Scientific Publ., Oxford.
Williams, D.G., G.R. McPherson,
and J.F. Weltzin. 1999. Stress in Wildland plants: Implications for ecosystem
structure and function. Pages 907-929.
In M. Pessarakli (ed.). Handbook of plant and crop stress: second
edition. Marcel
Dekkar, Inc., New York.
Williams, D.G. and K.A. Snyder.
2003. Responses of woody plants to heterogeneity of soil water in arid and
semiarid environments. Pages 28-46. In J. Weltzin and G. McPherson (eds), Changing
precipitation regimes and terrestrial ecosystems. University of Arizona Press,
Tucson.
Goodrich, D.C., D.G.
Williams, C.L. Unkrich, J.F. Hogan, R.L. Scott, K.R. Hultine, D. Pool,
A.L. Coes, and S. Miller. 2004. Comparison of methods
to estimate ephemeral channel recharge, Walnut Gulch, San Pedro River Basin, Arizona, In Groundwater Recharge in a
Desert Environment: The Southwestern
United States, edited by J.F. Hogan, F.M. Phillips, and B.R.
Scanlon, Water Science and Applications Series, vol. 9, American Geophysical Union, Washington, D.C., pp. 77-99.
*Yepez E.A. and D.G. Williams. Precipitation pulses and ecosystem carbon and water exchange in arid and semiarid environments. In Biophysical plant ecology: perspectives and trends, ed. E. de la Barrera. UC Press, Berkeley CA. (submitted).
Williams, D.G. and R. Scott. Vegetation-hydrology interactions: Dynamics of riparian plant water use along the San Pedro River, Arizona. In Stromberg, J. and B. Tellman (eds) Riparian area conservation and ecology in a semi-arid region: the San Pedro River example. (in press).
Williams, D.G., R.D. Evans and J.R. Ehleringer. Applications of stable isotope measurements for early-warning detection of ecological change. In T.E. Dawson and R. Siegwolf (eds), Isotopes as tracers of ecological change. Elsevier Academic Press. (in review).
Hemming, D., N. Loader, A. Marca , I. Robertson, D. Williams, L. Wingate, D. Yakir. The future of large-scale isotope networks. In T.E. Dawson and R. Siegwolf (eds), Isotopes as tracers of ecological change. Elsevier Academic Press. (in review).
Refereed journal articles
Williams, D.G. and D.D. Briske.
1991. Size and ecological significance of the physiological individual in the
bunchgrass Schizachyrium scoparium. Oikos 62:41-47.
Williams, D.G. and R.A. Black.
1993. Phenotypic variation in contrasting temperature environments: Growth and
photosynthesis in Pennisetum setaceum from different altitudes on Hawaii. Functional
Ecology
7:623-633.
Williams, D.G. and R.A. Black.
1994. Response to drought for a native and introduced Hawaiian grass. Oecologia 97:512-519.
Williams, D.G., Mack, R.N. and
R.A. Black. 1995. Ecophysiology and growth of introduced Pennisetum setaceum on Hawaii: The role of
phenotypic plasticity. Ecology 76:1569-1580.
Williams, D.G. and R.A. Black.
1996. Resource limitations to growth and gas exchange for introduced Pennisetum
setaceum on
Hawaii. Canadian Journal of Botany 74:268-265.
Williams, D.G. and J.R.
Ehleringer. 1996. Carbon isotope discrimination in three semi-arid woodland
species along a monsoon gradient. Oecologia 106:455-460.
Linton, M.J., J.S. Sperry, and
D.G. Williams. 1998. Xylem cavitation in roots and branches of Juniperus
osteosperma and
Pinus edulis.
Functional Ecology
12:906-911.
Williams, D.G. and J. R.
Ehleringer. 2000. Carbon isotope discrimination and water relations of oak
hybrid populations in southwestern Utah. Western North American Naturalist 60:121-129.
Cooper, D.I., W.E. Eichinger, L.
Hipps, J. Kao, J. Reisner, S. Smith, *S.M. Schaeffer, and D.G. Williams. 2000.
Spatial and temporal properties of water vapor and flux over a riparian canopy.
Agricultural and Forest Meteorology 105:161-183.
Goodrich, D.C., A. Chehbouni, B.
Goff, B. MacNish, T. Maddock, S. Moran, W.J. Shuttleworth, D.G. Williams et al.
2000. Preface paper to the Semi-Arid Land-Surface-Atmosphere (SALSA) program
special issue. Agricultural and Forest Meteorology 105:3-19.
Goodrich, D.C., R. Scott, J. Qi,
B. Goff, C.L. Unkrich, M.S. Moran, D.G. Williams, *S. Schaeffer, *K. Snyder, R.
MacNish, T. Maddock, D. Pool, A. Chehbouni, D.I. Cooper, W.E. Eichinger, W.J.
Shuttleworth, Y. Kerr, R. Marsett, and W. Ni. 2000. Seasonal estimates of
riparian evapotranspiration using remote and in-situ measurements. Agricultural and Forest Meteorology 105:281-309.
*Schaeffer, S.M., D.G. Williams,
and D.C. Goodrich. 2000. Transpiration in cottonwood/willow forest patches
estimated from sap flux. Agricultural and Forest Meteorology 105:257-270.
*Snyder, K. and D.G. Williams.
2000. Water sources used by riparian trees varies among stream types on the San
Pedro river, Arizona. Agricultural and Forest Meteorology 105:227-240.
Williams, D.G. and J. R.
Ehleringer. 2000. Intra- and interspecific variation for summer precipitation
use in pinyon-juniper woodlands. Ecological Monographs 70:517-537.
Williams, D.G. and Z. Baruch.
2000. African grass invasion in the Americas: ecosystem consequences and the
role of ecophysiology. Biological Invasions. 2:123-140.
Wall, G.W., T.J. Brooks, N.R.
Adam, A. Cousins, B.A. Kimball, P.J. Pinter, Jr, R.L. LaMorte, J. Triggs, M.J.
Ottman, S.W. Leavitt, A.D. Matthias, D.G. Williams, and A.N. Webber. 2001.
Elevated atmospheric CO2 improved sorghum plant water status by
ameliorating the adverse effects of drought. New Phytologist 152:231-248.
Weltzin, J.F., *K.A. Snyder, and
D.G. Williams. 2001. Changes in precipitation seasonality and oak (Quercus) recruitment: linking physiology
and demography. Western North American Naturalist 61:463-472.
Williams, D.G., *V. Gempko, *A.
Fravolini, S.W. Leavitt, G.W. Wall, B.A. Kimball, P.J. Pinter Jr., R. LaMorte,
and M. Ottman. 2001. Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment
and drought. New Phytologist 150:285-293.
*Fravolini, A., D.G. Williams,
and T.L. Thompson. 2002. Carbon isotope discrimination and bundle sheath
leakiness in three C4 subtypes grown under variable nitrogen, water
and atmospheric CO2 supply. Journal of Experimental Botany 53:2261-2269.
Brooks, J.R., N. Buchmann, S.
Phillips, B. Ehleringer, R. Evans, L.A. Martinelli, W.T.
Pockman, D. Sandquist, J.P. Sparks, L. Sperry, D.G. Williams, and J.R.
Ehleringer. 2002. Heavy and light beer: a carbon isotope approach to detecting
C4 carbon in beers of different origins, styles and prices. Journal
of Agricultural & Food Chemistry 50:6413-6418.
Scott, R.L., C. Watts, J. Garatuza, E. Edwards, D.C. Goodrich, D.G. Williams, and W.J. Shuttleworth. 2003. The understory and overstory partitioning of energy and water fluxes in a semi-arid woodland ecosystem. Agricultural and Forest Meteorology 114:127-139.
*Hultine, K.L., *W.L. Cable,
S.S.O. Burgess, and D.G. Williams. 2003. Hydraulic redistribution by deep roots
of a Chihuahuan desert phreatophyte. Tree Physiology 23:353-360.
*Hultine, K., D.G. Williams, S.S.O. Burgess, and T.O. Keefer. 2003. Hydraulic redistribution and diurnal storage capacitance in desert phreatophytes. Oecologia 135:167-175.
*Snyder, K.A., and D.G.
Williams. 2003. Experimental defoliation differentially alters water uptake by
deep and shallow roots of Prosopis velutina (velvet mesquite). Functional
Ecology
17:363-374.
*Yepez, E.A., D.G. Williams, R. Scott, and G. Lin. 2003. Partitioning overstory and understory evapotranspiration in a semi-arid savanna ecosystem from the isotopic composition of water vapor. Agricultural and Forest Meteorology 119:53-68.
Weltzin, J.F., M.E.
Loik, S. Schwinning, D.G. Williams, P. Fay, B. Haddad, J. Harte, T.E. Huxman,
A.K. Knapp, G. Lin, W.T. Pockman, M.R. Shaw, E. Small, M.D. Smith, S.D. Smith,
D.T. Tissue, and J.C. Zak. 2003. Assessing the response of terrestrial
ecosystems to potential changes in precipitation. BioScience 53:941-952.
*Potts, D.L. and D.G. Williams.
2004. Response of tree ring Holocellulose d13C to moisture
availability in Populus fremontii at perennial and intermittent
stream reaches. Western North American Naturalist 64:27-37.
Huxman T.E., M.D. Smith, P.A.
Fay, A.K. Knapp, M.R. Shaw, M.E. Loik, S.D. Smith, D.T. Tissue, J.C. Zak, J.F.
Weltzin, W.T. Pockman, O.E. Sala, B. Haddad, J. Harte, G.W. Koch, S.
Schwinning, E.E. Small, and D.G. Williams. 2004. Precipitation and production:
convergence across biomes to a common rain-use efficiency. Nature 429:651-654.
Guerenstein, P.G., *E.A. Yepez,
J. van Haren, D.G. Williams, J.G. Hildebrand. 2004. Floral CO2
emission may indicate food abundance to nectar-feeding moths. Naturwissenschaften 91:329-333.
*Hultine, K.R., R.L. Scott,
*W.L. Cable, and D.G. Williams. 2004. Hydraulic redistribution by a dominant,
warm-desert phreatophyte: seasonal patterns and response to precipitation
pulses. Functional Ecology 18:530-538.
Williams, D.G., *W. Cable, *K.
Hultine, J.C.B. Hoedjes, *E. Yepez, V. Simonneaux,
S. Er-Raki, G. Boulet, H.A.R. de Bruin, A. Chehbouni,
O.K. Hartogensis and F. Timouk. 2004. Components of evapotranspiration
determined by stable isotope, sap flow and eddy covariance techniques. Agricultural
and Forest Meteorology 125:241-258.
Huxman, T.E., J.M. Cable, D.D.
Ignace, J.A. Eilts, *N.B. English, J. Weltzin, and D.G. Williams. 2004.
Response of net ecosystem gas exchange to a simulated precipitation pulse in a
semi-arid grassland: the role of native and non-native grasses and soil
texture. Oecologia
141:295-305.
*Salo, L.F., G.R.
McPherson, and D.G. Williams. 2005. Sonoran Desert winter annuals affected by
density of red brome and soil nitrogen. The American Midland Naturalist 153:95-109.
*English, N.B, J.F. Weltzin, *A.
Fravolini, L. Thomas, D.G. Williams. 2005. The
influence of soil texture and vegetation on soil moisture under rainout
shelters in a semi-desert grassland. Journal of Arid Environments 63:324-343.
Williams, D.G., J.
Coltrain, M. Lott, *N. English, and J.R. Ehleringer. 2005.
Oxygen isotopes in cellulose identify source water for archeological maize in
the American Southwest. Journal of
Archaeological Science
32:931-939.
*Fravolini, A., *K. Hultine, E.
Brugnoli, *R. Gazal, *N. English and D.G. Williams. 2005. Precipitation pulse
use by an invasive woody legume: the role of soil texture and pulse size. Oecologia 144:618-627.
Pendall, E., D.G. Williams and
S.W. Leavitt. 2005. Seasonal and diurnal variations in pinon pine leaf water
isotopic enrichment across a summer moisture gradient. Oecologia 145:605-618.
Ferrio,
J.P., V. Resco, D.G. Williams, L. Serrano, J. Voltas. 2005. Stable isotopes in arid and
semi-arid forest systems. Investigaci�n Agraria. Sistemas y Recursos Forestales Monogr�fico, 1-12.
Potts, D.L., T.E. Huxman, B.J.
Enquist, J. Weltzin and D.G. Williams. 2005. Resilience and resistance of
ecosystem functional response to a precipitation pulse in a semi-arid
grassland. Journal of Ecology 94:23-30.
*Yepez,
E.A., T.E. Huxman, D.D. Ignace, *N.B. English, J.F. Weltzin, A.E. Castellanos
and D.G. Williams. 2005. Dynamics
of transpiration and evaporation following a moisture pulse in semiarid
grassland: a chamber-based isotope method for partitioning flux components. Agricultural
and Forest Meteorology 132:359-376.
*Hultine K.R., *D.F. Koepke,
W.T. Pockman , *A. Fravolini, J.S. Sperry and D.G. Williams. 2006. Influence of
soil texture on hydraulic properties and water relations of a dominant
warm-desert Phreatophyte. Tree Physiology
26:313-323.
Scott, R.L., T.E. Huxman, D.G.
Williams, D.C. Goodrich. 2006. Ecohydrological impacts of woody plant
encroachment: seasonal patterns of water and carbon dioxide exchange within a
semiarid riparian environment. Global Change Biology 12:311�324.
*Gazal,
R., R.L. Scott, D.C. Goodrich and D.G. Williams. 2006. Controls on
transpiration in a desert riparian cottonwood forest. Agricultural and
Forest Meteorology 137:56�67.
Potts,
D.L., T.E. Huxman, J.M. Cable, N.B. English, D.D. Ignace, J.A. Eilts, M.J.
Mason, J.F. Weltzin and D.G. Williams. 2006. Antecedent moisture and seasonal
precipitation influence response of canopy-scale carbon and water exchange to
rainfall pulses in semi-arid grassland. New Phytologist doi:10.1111/j.1469-8137.2006.01732.x.
Williams, D.G., T.E. Huxman, R.L. Scott, D.
Goodrich and G. Lin. 2006. Sensitivity of riparian ecosystems in arid
and semiarid environments to moisture pulses. Hydrological Processes (in press).
Potts, D.L., R.L. Scott, D.G. Williams, D.C. Goodrich and T.E. Huxman. The sensitivity of ecosystem carbon exchange to seasonal precipitation and woody plant encroachment. Oecologia (in press).
Other articles
Hipps, L. E., D. Cooper, W.
Eichinger, D. Williams, et al. 1998. A summary of processes which are connected
to evaporation of riparian and heterogeneous upland vegetation in arid regions.
Pages 13-17, In Wood, E.F., Chehbouni, A.G., Goodrich, D.C., Seo, D.J.,
Zimmerman, J.R., eds., Proceedings from the special symposium on hydrology:
Boston, Mass., American Meteorological Society, Boston, Massachusetts.
Maddock III, T., R.D. MacNish,
D.C. Goodrich, D.G. Williams, W.J. Shuttleworth, et al. 1998. The overview of
atmospheric and surface water coupling to regional groundwater models in
semi-arid basins. Pages 38-42, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich,
D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the
Special Symposium on Hydrology. American Meteorological Society, Boston,
Massachusetts.
Moran, S., D. Williams, D.
Goodrich, A. Chehbouni et al. 1998. Overview of remote sensing of semi-arid
ecosystem function in the upper San Pedro river basin. Pages 49-54, In Wood,
E.F., A.G. Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical
coordinators. Proceedings from the Special Symposium on Hydrology. American
Meteorological Society, Boston, Massachusetts.
Qi, J., M.S. Moran, D.C. Goodrich, R. Marsett, R. Scott, A. Chehbouni, S. Schaeffer, J. Schieldge, D. Williams, T. Keefer, D. Cooper, L. Hipps, W. Eichinger, and W. Ni. 1998. Estimation of evapotranspiration over the San Pedro riparian area with remote and in situ measurements. Pages 55-60, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.
*Schaeffer, S., and D.G.
Williams. 1998. Transpiration of desert riparian forest canopies estimated from
sap flux. Pages 180-184, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich, D.J.
Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special
Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.
*Snyder, K.A., D.G. Williams,
and V.L. Gempko. 1998. Water source determination for cottonwood, willow and
mesquite in riparian forest stands. Pages 185-188, In Wood, E.F., A.G.
Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators.
Proceedings from the Special Symposium on Hydrology. American Meteorological
Society, Boston, Massachusetts.
Williams, D.G., J.-P. Brunel, S.M. Schaeffer, and K.A. Snyder. 1998. Biotic controls over the functioning of desert riparian ecosystems. Pages 43-48, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.
Williams, D.G. 1999. The roots
of grass success. BioScience 49:667-670. Book review of Population biology of
grasses by G.P.
Cheplick (ed.).
Matthias, A.D., S.W. Leavitt,
T.L. Thompson, B.A. Kimball, P.J. Pinter Jr, G.W. Wall, R.S. Rauschkolb, M.J.
Ottman, R.L. Roth, T.J. Brooks, N.R. Adam, R.L. LaMorte, G. Weschsung, F.
Weschung, F.J. Adamsen, D.G. Williams, F.S. Nakayama, D.J. Hunsacker, J.
Watson, S.A. White, J.T. Welzmiller. 2001. Free-air CO2 enrichment
effects on wheat and sorghum at Maricopa, Arizona, USA. In Carbon dioxide and
vegetation: advanced international approaches for absorption of CO2
and responses to CO2 -The 13th Global Environment
Tsukuba-, CGER-I046-2001, CGER/NIES.
*Fravolini, A., K.R. Hultine, D.F. Koepke, and D.G. Williams. 2003. The role of soil texture on mesquite water relations and response to summer precipitation. In: Santa Rita Experimental Range: One Hundred Years (1903 to 2003) of accomplishments and contributions; conference proceedings; 2003 October 30 - November 1, Tucson, AZ. Proc. RMRS-P-00. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station.
*English, N.B., D.G. Williams, and J.F. Weltzin. 2003. Dynamics of soil temperature and moisture following experimental irrigation on the Santa Rita Experimental Range. In: Santa Rita Experimental Range: One Hundred Years (1903 to 2003) of accomplishments and contributions; conference proceedings; 2003 October 30 - November 1, Tucson, AZ. Proc. RMRS-P-00. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station.
Weltzin, J.F. and D.G. Williams.
2003. Isotopes for Ecosystems. Editorial on �Tracing changes in ecosystem
function under elevated CO2� by Pataki et al. BioScience 53:795.
Goodrich, D.C., D.G. Williams,
C.L. Unkrich, R.L. Scott, *K.R. Hultine, D. Pool, A. Coes, and J. Hogan. 2003.
Ephemeral channel recharge and evapotranspiration from near-channel vegetation.
Proceedings of Research in the Watersheds Conference.
50th anniversary of Walnut Gulch, USDA-ARS.
Williams, D.G. 2005.
Isotopes reveal
sources and sinks of trace gases. Book review of Stable isotopes and
biosphere-atmosphere interactions by Larry Flanagan, Jim Ehleringer and Diane Pataki (eds).
Ecology
86:3131-3132.
Williams, D.G. 2005.
Book review of Ecohydrology of water-controlled ecosystems: soil
moisture and plant dynamics by Ignacio
Rodr�guez-Iturbe and Amilcare Porporato. Eos,
Transactions of the American Geophysical Union 86:344.
Scott, R.L., D. Williams, D.
Goodrich, W. Cable, L. Levick, R. McGuire, R. Gazal, E. Yepez, P. Ellsworth and
T. Huxman. 2006. Determining the riparian groundwater use within the San Pedro
Riparian National Conservation Area and the Sierra Vista Sub-Basin, Arizona. In
Hydrologic Requirements of and Consumptive Ground-Water Use by Riparian
Vegetation along the San Pedro River, Arizona. Compiled by J.M. Leenhouts, J.C. Stromberg, and
R.L. Scott. U.S. Geological Survey Scientific Investigations Report.
Significant reports
Scott, R.L., D.C. Goodrich, L. Levick, R. McGuire, W. Cable, D.G. Williams, R. Gazal, E. Yepez, P Ellsworth and T. Huxman. 2004. San Pedro Riparian National Conservation Area (SPRNCA) water needs study:A research effort funded by the Upper San Pedro Partnership. 79 pp.
Williams, D.G., D. Evans and J. Ehleringer. 2005. On developing a plan for an isotope network within NEON: Report from two BASIN workshops. 30 pp.
Presentations
Invited seminar and symposium
presentations
Williams, D.G. 1992. Plasticity
of growth and photosynthesis in populations of Fountaingrass (Pennisetum
setaceum) from
different elevations on Hawaii. Department of Botany, University of Hawaii at
Manoa.
Williams, D.G. 1994. Use of
summer precipitation in pinyon-juniper woodlands along a summer precipitation
gradient. School of Forestry, Northern Arizona University, Flagstaff.
Williams, D.G. 1996. Water use
by desert plants: monsoons, drought, and response to change. Department of Ecology and Evolutionary
Biology, University of Arizona, Tucson, AZ.
Williams, D.G. and J.R.
Ehleringer. 1996. Use of monsoon precipitation by semi-arid woodland species
along a monsoon gradient. American Association for the Advancement of Science,
Southwestern Region Annual Meeting, Flagstaff, Arizona.
Ehleringer, J.R., R.D. Evans and
D.G. Williams. 1996. Sensitivity to change in aridland ecosystems. Symposium:
Stable isotopes and the integration of biological, ecological and geochemical
processes. Newcastle, UK.
Williams, D.G. 1996. Water use by
desert plants: monsoons, drought, and response to change. Department of Biology, University of
Arkansas, Fayetteville, AR.
Williams, D.G. 1997. Plant
functional attributes in southwestern savannas: Can we generalize? Symposium:
Natural and anthropogenic influences on savanna ecosystems of the arid
southwest. Ecological Society of America Annual Meeting, Albuquerque, New
Mexico.
Williams, D.G. 1997. Water use
by desert plants: monsoons, drought, and response to change. Universidad de
Sonora, Hermasillo, Mexico.
Williams, D.G. 1997. Water use
by desert plants: monsoons, drought, and response to change. Department of Biology, Boise State
University, Boise, ID.
Williams, D.G., D.R. Sandquist,
and Z. Baruch. 1998. Ecophysiological processes related to invasion and
ecosystem dominance by African C4 grasses. Symposium: Biotic
invasions: a global perspective. VII International Congress of Ecology,
Florence, Italy.
Williams, D.G. 1998. Sources of
water used by desert riparian trees: The root causes. Department of Plant
Sciences, University of Arizona, Tucson, AZ.
Williams, D.G. 1999. Regulation
of the hydrologic cycle by plants: The root causes. Department of Plant Biology, Arizona State University,
Tempe, AZ.
Williams, D.G. 2000. Root system
dynamics and resource patchiness in semi-arid ecosystems. Department of Ecology
and Evolutionary Biology, University of Tennessee, Knoxville, TN.
Williams, D.G. 2002. Precipitation pulse use by plants in arid and semiarid environments: an isotopic perspective. Department of Renewable Resources, University of Wyoming, Laramie, WY.
Hultine, K.R., W.L. Cable, D.G. Williams, P.Z. Ellsworth, and R.L. Scott. 2002. Transpiration by mesquite on a desert river floodplain. The American Geophysical Union Chapman Conference on Eco-Hydrology of Semiarid Landscapes: Interactions and Processes, Taos, NM.
Williams, D.G. 2002. Precipitation pulse use by plants in arid and semiarid environments. Centre d�Etudes Spatiales de la Biosphere, Centre National de la Recherche Scientifique, Toulouse, France.
Williams, D.G. 2003. Resource
pulses in arid and semiarid environments: responses from leaf to catchment
scales. Natural Resources Ecology Laboratory, Colorado State University, Ft.
Collins, CO.
Williams, D.G. 2004. Plant ecology meets hydrology - examples from the arid
Southwest. Department of Integrative Biology, The University of Texas,
Austin, TX.
Williams, D.G. and E.A. Yepez.
2004. Tracing sources of evapotranspiration using
stable isotopes: challenges and new opportunities. Invited symposium
presentation; Eco-hydrology. Ecological Society of America annual meeting,
August 3, 2004, Portland, OR.
Williams, D.G. 2004. Eco-hydrology and
hydro-ecology: a synthetic view of vegetation-water interactions in arid
regions. School of Biological Sciences, Washington State University, Pullman,
WA.
Williams, D.G., R.L.
Scott, T.E. Huxman and D.C. Goodrich. 2005. Multi-scale eco-hydrology of
riparian ecosystems in the desert Southwest. Invited symposium presentation;
Ecohydrology: emerging issues. Society for Range Management annual meeting,
February 7, 2005, Fort Worth, TX.
Williams, D.G. 2005.
The use of stable isotopes to investigate dynamics of dryland communities and
ecosystems. Invited symposium presentation; The biology of dryland plants.
Botanical Society of America annual meeting, August 17, 2005, Austin, TX.
Williams, D.G. 2005.
Photosynthetic
responses of riparian tree taxa to monsoonal moisture in the American
Southwest: large-scale patterns across three warm-desert biomes. Invited
presentation, organized oral session, Ecological
Society of America annual meeting, August 11, 2005, Montreal, Canada.
Williams, D.G. 2005.
Integration of
ecohydrological processes in space and time: insights from stable isotope
measurements in the soil-plant-atmosphere continuum.
AGU
Williams, D.G., R.D.
Evans and J.R. Ehleringer. 2006. Isotope measurement networks for monitoring ecological change at
regional to continental scales. Invited conference presentation. Isotopes as
tracers of ecological change. SIBAE-BASIN. March 13-15, Tomar, Portugal.
Williams, D.G. 2006. Chinese
Graduate School, Beijing
Other lectures and seminars
Williams, D.G. 2004. On
developing a plan for a stable isotope network within NEON. Department of
Botany, University of Wyoming, December 10, 2004.
Williams, D.G. 2004. Hidden
messages in the environment revealed by stable isotope mass spectrometry.
Research Across Disciplines seminar series, Department of Renewable Resources,
University of Wyoming, November 5, 2004.
Williams, D.G. 2005. Ecohydrology
studies in Morocco. Research Across Disciplines seminar series, Department of
Renewable Resources, University of Wyoming, March 4, 2005.
Williams, D.G. 2006.
Duolung Grassland Research Station, China
Contributed abstracts
Williams, D.G. and D. D. Briske.
1987. Physiological integration within the bunchgrass Schizachyrium
scoparium:
Extent and ecological significance. Ecological Society of America annual
meeting, Columbus, OH.
Williams, D. G., R. N. Mack and
R. A. Black. 1991. Phenotypic correlations among physiological, morphological
and reproductive characters in populations of the grass Pennisetum setaceum in Hawaii. Ecological Society
of America annual meeting, San Antonio, TX.
Williams, D. G., R. A. Black and
R. N. Mack. 1992. Plasticity of growth and photosynthetic characters in the
introduced C4 grass Pennisetum
setaceum from
different elevations on Hawaii. Ecological Society of America annual meeting,
Honolulu, HI.
Williams, D. G. and R. A. Black.
1993. Response to drought for native and alien Hawaiian grasses. Ecological
Society of America annual meeting, Madison, WI.
Williams, D.G. and J. R.
Ehleringer. 1994. Patterns of water use by aridland trees along a summer
precipitation gradient. Ecological Society of America annual meeting, Knoxville,
Tennessee.
Williams, D.G. and J. R.
Ehleringer. 1995. Carbon isotope discrimination in three semi-arid woodland
species along a monsoon gradient. Ecological Society of America annual meeting,
Snowbird, Utah.
Williams, D.G. and J.R. Ehleringer. 1996. Water sources and carbon
isotope discrimination for three semi-arid woodland species along a monsoon
gradient. Conference - Stable isotopes and the integration of biological,
ecological and geochemical processes. Newcastle, UK.
Goodrich, D.C., T. Maddock, III, R. MacNish, M.S. Moran, J.
Shuttleworth, and D.G. Williams. 1996. Measurements of GW, SW, and ET Fluxes in
a Semi-Arid Riparian System as part of the SALSA Program. American Geophysical
Union, San Francisco, CA.
Snyder, K.A., J.F. Weltzin and D.G. Williams. 1997. Effects of
altered precipitation regimes on oak seedling carbon isotope discrimination and
gas exchange. Ecological Society of America annual meeting, Albuquerque, NM.
Schaeffer, S.M., D.G. Williams and J.R. Ehleringer. 1997. Water source
partitioning among plant life forms in pinyon-juniper ecosystems. Ecological
Society of America annual meeting, Albuquerque, NM.
Linton, M.J., J.S. Sperry, and D.G. Williams. 1997. Xylem cavitation
in roots and branches of Juniperus osteosperma and Pinus edulis. Ecological Society of America
annual meeting, Albuquerque, NM.
Schaeffer, S.M., D.G. Williams. 1998. Transpiration of desert
riparian forest canopies estimated from sap flux. Society for Range Management
Annual meeting, Guadalajara, Mexico.
Keopke, D. and D.G. Williams. 1998. Comparative gas exchange and
water relations in young and old shoots of a desert riparian phreatophyte.
Ecological Society of America annual meeting, Baltimore, MD.
Snyder, KA. And D.G. Williams. 1998. Environmental and physiological
controls on water source utilization patterns. Ecological Society of America
annual meeting, Baltimore, MD.
Snyder, K.A. and D.G. Williams. 1999. Tree water sources in riparian
ecosystems of the southwestern USA: implications for restoration and
conservation. Society for Ecological Restoration Annual Meeting.
Salo, L.F., G.R. McPherson, and D.G. Williams. 1999. Biogeography of red brome in the Sonoran Desert. Natural Areas Conference, October
13-16, 1999, Tucson, Arizona.
Leavitt, S.W., L. Cheng, T. Brooks, A.D. Matthias, D.G. Williams, T.
Thompson, B. Kimball, and P. Pinter. 1999. Elevated CO2 and limited water supply effects on
carbon processes and sequestration in a C4 grass (Sorghum) ecosystem- Soil carbon. Agronomy Annual Meeting Abstracts. Salt
Lake City, Oct. 31-Nov. 4.
Hultine, K.R. and D.G. Williams. 1999. Evidence of hydraulic lift in
riparian trees occurring in southeastern Arizona. Ecological Society of America
annual meeting, Spokane, WA.
Snyder, K.A. and D.G. Williams. 1999. Defoliation differentially
alters function of deep and shallow roots in mesquite (Prosopis velutina). Ecological Society of America
annual meeting, Spokane, WA.
Fravolini, A. and D.G. Williams. 2000. Effects of elevated CO2,
water supply and nitrogen nutrition on growth and photosynthesis in three C4
grasses. Ecological Society of America annual meeting, Snowbird, UT.
Salo, L.F., G.R. McPherson, and D.G. Williams. 2000. Biogeography of
red brome (Bromus madritensis subsp. rubens) in the Sonoran Desert. Ecological Society of America
annual meeting, Snowbird, UT.
Trafton, A., K.R. Hultine, and D.G. Williams. 2000. Trees on the
edge: Water relations and leaf carbon isotope discrimination in a Chihuahuan
Desert wash. Ecological Society of America annual meeting, Snowbird, UT.
Koepke, D.F., D.G. Williams, and A. Fravolini. 2000. Effects of soil
moisture substrate characteristics on mesquite water relations and leaf carbon
isotope ratios in semi-desert grasslands. Ecological Society of America annual
meeting, Snowbird, UT.
Williams, D.G., G. Lin, and J-.P. Brunel. 2000. Stable isotope
composition of water vapor and CO2 of air in mesquite-C4
grass vegetation. Ecological Society of America annual meeting, Snowbird, UT.
Snyder, K.A. and D.G. Williams. 2000. Transpiration, root
architecture, and biomass allocation in cottonwood (Populus fremontii) and mesquite (Prosopis
velutina):
Responses to experimental defoliation. Ecological Society of America annual
meeting, Snowbird, UT.
Tiller, R.L., K.A. Snyder, D.G. Williams, and J.C. Stromberg. 2000.
Water source use of a riparian tallgrass, big sacaton (Sporobolus wrightii), along a gradient of depth to
groundwater and rainfall regime in southeastern Arizona USA. Ecological Society
of America annual meeting, Snowbird, UT.
Potts, D., and D.G. Williams. 2001. Cottonwood tree-ring d13C response to seasonal precipitation
and stream flow. American Water Resources Association annual meeting,
Albuquerque, NM.
Ellsworth, P. and D.G. Williams. 2001. Water use by mesquite. Poster
presentation and abstract to the 2001 Beckman Scholar Symposium, Irvine, CA.
Hultine, K.R., D.G. Williams, S.S. Burgess. 2001. Contrasting
seasonal patterns of root and stem sap flow in three tree species in a desert
arroyo. Ecological Society of America annual meeting, Madison, WI.
Hultine, K.R., D.G. Williams, W.L. Cable, S.S. Burgess. 2001.
Downward recharge through root systems: has the decline of walnut trees altered
the hydrology of semi-arid riparian systems? American Geophysical Union, San
Francisco, CA.
Williams, D.G. R. Scott, G. Lin, D. Martens, C. Watts, D. Goodrich,
J. Garatuza, J. Rodriguez, E. Edwards, K. Hultine, E. Yepez, P. Ellsworth, W.
Cable, J. van Haren, D. Pierce. 2001. Seasonal dynamics of water, carbon, and
energy fluxes in mesquite woodland: project overview and preliminary results.
American Geophysical Union, San Francisco, CA.
Scott, R.L., C. Watts, J. Garatuza, E. Edwards, D.G. Williams, D.
Goodrich. 2001. Measuring the distribution of surface energy and water fluxes
in a riparian mesquite savanna-type ecosystem. American Geophysical Union, San
Francisco, CA.
Yepez, E.A., G. Lin, D.G. Williams, J. van Haren, D. Pierce. 2001.
Isotopic partitioning of CO2 and evapotranspiration fluxes in a
semi-arid savanna: effects of sampling height and monsoon rains. American
Geophysical Union, San Francisco, CA.
Williams, D.G. and G. Lin. 2001. Stable isotope composition of water
vapor and CO2 of air in mesquite-C4 grass savanna.
International symposium � Arid regions monitored by satellites: from observing
to modeling for sustainable management. Marrakech, Morocco.
English, N.B., D.G. Williams, J.F. Weltzin, A. Fravolini, L. Thomas,
and M. Andregg. 2002. Implementation and monitoring of large-scale
precipitation shelters on semi-arid grasslands, Santa Rita Experimental Range,
Arizona. Ecological Society of America annual meeting, , Tucson, AZ.
Cable, W.L., K.R. Hultine, D.G. Williams and R.L. Scott. 2002.
Transpiration by mesquite on a desert river floodplain. Ecological Society of
America annual meeting, , Tucson, AZ.
Yepez-Gonzalez, E.A., P.Z. Ellsworth, W.L. Cable, K.R. Hultine and
D.G. Williams. 2002. Partitioning evapotranspiration fluxes and sources in
desert floodplain ecosystems. Ecological Society of America annual meeting,
Tucson, AZ.
Cheng, L., S. Leavitt, T. Brooks, A. Matthias, D.
Williams, T. Thompson, B. Kimball, P. Pinter. 2002. Seasonal soil respiration
and soil CO2 under elevated CO2 in the sorghum
agroecosystem. Ecological
Society of America annual meeting, Tucson, AZ.
Pierce, D., J. van Haren, G. Lin, E. Yepez, R. Scott, D.
Martins and D. Williams. 2002. Partitioning of CO2 fluxes in a
semi-arid ecosystem using stable isotopes: Effects of monsoon rains. Ecological Society of America
annual meeting, Tucson, AZ.
Hultine, K., D. Williams, W. Cable and S. Burgess. 2002. Hydraulic redistribution by deep roots of a Chihuahuan
Desert phreatophyte. Ecological Society of America annual meeting,
Tucson, AZ.
Salo, L., G. McPherson and D. Williams. 2002. Sonoran
Desert winter annuals affected by density of red brome and soil nitrogen level. Ecological Society of America
annual meeting, Tucson, AZ.
Huxman, T E, J M Cable, D D Ignace, A J Eilts, N English, J Weltzin,
and D G Williams. 2002. Geomorphic Influence on Ecosystem Precipitation Pulse
Response in a Semi-Arid Grassland. The American Geophysical Union Chapman
Conference on Eco-Hydrology of Semiarid Landscapes: Interactions and Processes,
Taos, NM.
Scott, R L, D C Goodrich, D G Williams, and W J Shuttleworth. 2002.
Groundwater - Vegetation - Atmosphere Interactions in Semiarid Riparian
Ecosystems: Mesquite Eco-hydrology on the San Pedro River, Arizona. The
American Geophysical Union Chapman Conference on Eco-Hydrology of Semiarid
Landscapes: Interactions and Processes, Taos, NM.
Williams, D.G., W. Cable, K. Hultine, E. Yepez, S. Er-Raki, J.C.B.
Hoedjes, G. Boulet, H.A.R. de Bruin, A. Chehbouni, and F. Timouk. 2003. Suivi
de la r�partition de l'evapotranspiration dans une oliveraie (Olea europaea L.) � l'aide des techniques de
l'eddy covariance, des flux de s�ve et des isotopes stables. 5th
Journ�es d�Ecologie Functionnelle, Nancy, France.
English, N.B., D.G. Williams and J.F. Weltzin. 2003. The influence
of pulsed water events on soil temperature, Santa Rita Experimental Range,
Southeastern Arizona. Santa Rita Experimental Range: One-hundred years (1903-2003)
of accomplishments and contributions, 30 October � 1 November, Tucson, AZ.
Poster.
Chen, J., D.L. Potts, T.E. Huxman, J.F. Weltzin, D.G. Williams, N.B.
English. 2003. Trace gas fluxes in a semi-arid grassland: the role of C4
bunchgrass species, simulated precipitation and season. Ecological Society of America Annual
Meeting, August 3-8, Savannah, GA. Poster.
Potts, D.L., T.E. Huxman, B.J. Enquist, J.F. Weltzin, and D.G. 2003.
Williams. Multivariate analysis of ecosystem response to precipitation pulses.
Ecological Society of America Annual Meeting, August 3-8, Savannah, GA. Presented.
Thom C, Guerenstein P, Yepez E, Mechaber W, Vanharen J, Hildebrand
J, Williams D. 2003. CO2 emission by Datura flowers and its significance
for foraging Manduca sexta
moths. The 25th Ann. Meeting of the Assoc. for Chemoreception
Sciences (AchemS), Sarasota, FL (USA).
Li Cheng, Dean Martens, Steven W. Leavitt, B.A. Kimball, A. D.
Matthias, M. J. Ottman, D. G. Williams,
G.W. Wall, and P. J. Pinter Jr. 2003. Free Air-CO2 Enrichment (FACE) of C4-Sorghum:
Biochemical Composition and Decomposition of Sorghum Tissues Grown Under
Elevated CO2. ASA-CSSA-SSSA annual
meeting.
Salo, L.F., G.R. McPherson, and D.G. Williams. 2004. Red
brome and Sonoran Desert winter annuals affected by soil nitrogen level, poster
presentation. Research and
Technology of Nitrogen Sequestration for Cheatgrass Control Workshop, Society
for Range Management's 57th Annual Meeting, 'Rangelands in Transition', January
24-30, 2004, Salt Lake City, UT.
Williams, D.G., J. Coltrain, M. Lott, N.B. English and J.R.
Ehleringer. 2004. Oxygen isotopes in cellulose identify source water for
archeological maize in the American Southwest. The 4th International Conference
on Applications of Stable Isotope Techniques to Ecological Studies. Wellington,
New Zealand. April 19-23.
Fravolini, A., K.R. Hultine, E. Brugnoli, R. Gazal, N.B. English,
and D.G. Williams. 2004. Precipitation pulse use by an invasive woody legume:
the role of soil texture and pulse size. The 4th International Conference on
Applications of Stable Isotope Techniques to Ecological Studies. Wellington,
New Zealand. April 19-23, 2004.
Yepez, E.A. T.E. Huxman, D. Ignace, N. English, J.F. Weltzin and
D.G. Williams. 2004. Short-term dynamics of soil evaporation and transpiration
following a moisture pulse in semiarid grassland: a chamber-based method using
stable isotope tracers. Contributed poster to RISE Symposium, Tucson, AZ.
Cable, J.M., T.E. Huxman, J.F. Weltzin, D.G. Williams, D.L. Potts,
D.D. Ignace, N.B. English and M. Mason. 2004. Controls on respirationin a
semi-arid grassland in southeastern Arizona. Abstract � Ecological Society of
America annual meeting, August 1-6, Portland, Oregon.
Gazal, R.M., R.S. Scott, D.G. Williams and D.A. Goodrich. 2004.
Controls on transpiration in a desert riparian cottonwood forest. Abstract � Ecological Society of America, 89th Annual Meeting, August 1-6,
Portland, Oregon.
Gazal, R.M., R.S. Scott, D.G. Williams and D.A. Goodrich. 2004. Seasonal variation of transpiration in desert riparian
cottonwood forest patches. Workshop on �Conservation and management of
fragmented forest landscapes� October 25-28, Tsukuba, Japan.
Yepez, E.A, R.S. Scott and D.G. Williams. 2004.
Unraveling components of evapotranspiration in semiarid woodland from the
isotopic composition of water vapor. Ecological Society of America, 89th Annual Meeting, August 1-6, Portland, Oregon.
Yepez, E.A, R.S, Scott and D.G. Williams. 2004.
Partitioning of evapotranspiration from the isotopic composition of water
vapor: a case study from semiarid woodland. SIBAE-BASIN conference,
�partitioning fluxes between the biosphere across spatial scales� Interlaken
Switzerland, April 2004.
Yepez E.A., T.E. Huxman, D. Ignace, N.B. English, J.F. Weltzin and D.G.
Williams. 2004. Short-term dynamics of soil evaporation and transpiration
following a moisture pulse in semiarid grassland: a chamber-based method using
stable isotope tracers. 1st symposium on Research Insights in
Semiarid Ecosystems, November, University of Arizona, Tucson AZ.
Ellsworth, P.Z., D.G. Williams,
R.L. Scott and E.A. Yepez. 2004. Contribution of deep
unsaturated-zone soil water to transpiration of a facultative phreatophyte. 89th Annual Meeting of the Ecological Society of America, Portland, OR, 2004.
Ignace, D.D., T.E. Huxman, D.L. Potts, J.M. Cable, M. Mason, N.B.
English, J.F. Weltzin and D.G. Williams. 2004. Functional
response of native and nonnative grasses to simulated precipitation in the
Sonoran Desert. 89th Annual Meeting of the Ecological Society of America, Portland, OR.
Williams, D.G, W.
Cable, K. Hultine, J.C.B. Hoedjes, E.A. Yepez, V. Simonneaux,
S. Er-Raki, G. Boulet, H.A.R. de Bruin, A. Chehbouni,
O.K. Hartogensis, and F. Timouk. 2004. Components of evapotranspiration
determined by eddy covariance, sap flow and stable isotope techniques. SIBAE-BASIN conference, �Partitioning fluxes between the
biosphere across spatial scales� Interlaken, Switzerland.
Reeder, J.D., M. Larson, D.G. Williams, J.A. Morgan and A.R. Mosier.
2004. Long-term grazing increases soil inorganic carbon in a short-grass
steppe. 89th Annual Meeting
of the Ecological Society of America, Portland, OR.
Cheng, L., S.W. Leavitt, B.A. Kimball, P.J.
Pinter Jr., M.J. Ottman, A. Matthias, G.W. Wall, T. Brooks, D.G. Williams, T.L.
Thompson. 2004.
Dynamics of labile and recalcitrant soil carbon pools in a sorghum Free-Air CO2
Enrichment (FACE) agroecosystem. Poster presentation at the American
Geophysical Union fall meeting, Dec. 13-16, 2004, San Francisco.
English, N.B., D.G. Williams and D.L. Dettman.
2004. Oxygen and Carbon Isotopic Variations in
Columnar Cacti: Are Responses to Climate Recorded
in Spines? Geological Society
of America Annual Meeting, November 7-10, Denver,
Colorado.
English, N.B., D.L. Dettman, D.G. Williams. 2004. Stable
isotopic variations in columnar cacti: are responses to climate recorded in
spines? American Geophysical Union Annual Meeting Abstracts, December 13-17,
San Francisco, California.
Eilts, J.A., T.E. Huxman, D.G. Williams and J.F. Weltzin. 2005. Differences in physiological response to
water availability due to dissimilar root characteristics in two co-occurring
grass species. 90th Annual Meeting of the Ecological Society of America, Montreal, Canada.
Ignace, DD., D.L. Potts, E.A. Yepez-Gonzales, T.E. Huxman, D.G.
Williams and J.F. Weltzin. 2005. Response of evapotranspiration in a semi-arid
ecosystem applied with a simulated precipitation pulse: The role of grass
species across geomorphic surfaces. 90th Annual
Meeting of the Ecological Society of America, Montreal, Canada.
Mason, M.J., J.F. Weltzin, D.L. Potts, N.B. English, T.E. Huxman and
D.G. Williams. 2005. Survivorship of woody plant seedlings under altered
precipitation regimes is facilitated by a non-native, invasive grass. 90th Annual Meeting
of the Ecological Society of America, Montreal,
Canada.
Pavo-Zuckerman, M.A., J. Cable, E. Yepez, D.L. Potts, T.E. Huxman
and D.G. Williams. 2005. Responses of soil community structure to plant species
and precipitation inputs: Linking soil biota to ecosystem carbon cycling. 90th Annual Meeting
of the Ecological Society of America, Montreal,
Canada.
Potts, D.L., T.E. Huxman, N.B. English, J.F. Weltzin and D.G.
Williams. 2005. Precipitation pulses in a simulated desert grassland: The role
of pulse seasonality and bunchgrass species on canopy-scale carbon exchange. 90th Annual Meeting
of the Ecological Society of America, Montreal,
Canada.
Scott, R.L., T.E. Huxman, D.G. Williams and D.C. Goodrich. 2005.
Ecohydrological impacts of woody phreatophyte invasion within a semiarid
riparian environment. Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract.
Cable, J.M., T.E. Huxman, W.L. Cable, R.L. Scott, D.G. Williams and
D.C. Goodrich. 2005. Responses of soil respiration to precipitation in a savannah
ecosystem: fine temporal measurements of soil CO2 efflux. Eos Trans. AGU, 86(52),
Fall Meet. Suppl., Abstract.
Pavo-Zuckerman, M.A., J. Cable, E. T.E. Huxman, R.L. Scott and D.G.
Williams. 2005. Soil community structure and ecosystem C cycling in arid
ecosystems experiencing multiple environmental changes. Eos Trans. AGU, 86(52), Fall
Meet. Suppl., Abstract.
Potts, D.L., J.M. Cable, R.L. Scott, D.G. Williams, D.C. Goodrich
and T.E. Huxman. 2005. Sensitivity of Prosopis velutina to summer rainfall and consequences
for seasonal patterns of ecosystem carbon exchange.
Eos Trans. AGU, 86(52), Fall Meet. Suppl.,
Abstract.
Huxman, T.E., D.G. Williams, R.L. Scott, J.M. Cable, D.L Potts, M.A.
Pavo-Zuckerman and D.D. Ignace. 2005. Soil and canopy control over ecosystem
carbon and water fluxes in a desert grassland: patterns from a rainfall
manipulation experiment. Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract.
Scott, R.L., T.E. Huxman, D.G. Williams and D.L Potts. 2006.
Ecohydrological Impacts of Woody Phreatophyte Invasion Within a Semiarid
Riparian Environment. American Meteorological Society Annual Meeting.
Radio Interviews
�Water in plants� � Science Update, American Association for the
Advancement of Science, broadcast nationally on 1/25/02,
<http://www.scienceupdate.com>.
�African grass invasion
of Arizona�s rangelands� � University of Arizona News Services, broadcast
locally on 1/28/01.
Other popular press reports
�Changing grasslands: interactions between native and non-native
vegetation� � by Susan McGinley, Arizona Agricultural Experiment Station
Research Report, College of Agriculture and Life Sciences, The University of
Arizona, November, 2000.
Professional service
activities
The
University of Arizona
School
of Renewable Natural Resources
Curriculum & Instruction Committee (1995-2002, member).
Core Curriculum Subcommittee (1995-2002, member).
Recruitment and Retention Committee (1996-2002, member).
SRNR Laboratory Committee (1997-2002, Chair).
Faculty search committee (1998, member).
Ad-hoc space committee (2001, member).
SRNR Policy committee (2001, elected member).
The
University of Arizona
Coordinating Committee on Global Change Interdisciplinary Program
(1996-2002, member).
Seminar Committee, Institute for the Study of Planet Earth (2000,
member).
University of Wyoming
Department of Renewable Resources
Advisor
to 4 undergad students � Wyoming Range Cup poster contest
Stable
Isotope Facility steering committee (Chair, 2003-present)
Space
committee (2006-present, member)
Department of Botany
Population Biology Faculty Search Committee � Fall, 2003
Forest and Fire Ecology Faculty Search Committee � Fall, 2004
Graduate Program in Ecology
Member of faculty
Graduate Affairs Committee � (2005-current, member)
Seminar Committee (2005-current, member)
University of Wyoming
Reviewer of proposals for Wyoming NSF EPSCoR Research Fellowships
for Undergraduates (Spring 2004)
Hosted University of Wyoming Board of Trustees visit to the UW
Stable Isotope Facility (2005)
Proposal reviews for EPSCoR Ecology graduate student research grants
(2006)
NSF-EPSCoR
Ecology Project, Internal Advisory Committee (2005-current, member)
State,
National, International
Society for Range Management Plant ID Team Coach for University of
Arizona (1995-2002).
Technical Session Moderator: Plant Water Relations. Ecological Society of America
annual meeting, Snowbird, UT (1995).
National Range Science Education Counsel (1996-2002, member).
National Range Science Education Counsel, Teaching Award Subcommittee
(1998-2000, member; 2000, chair).
Symposium co-organizer: Natural and anthropogenic influences on
savanna ecosystems of the arid southwest. Ecological Society of America annual
meeting in Albuquerque, NM (1997).
Buell/Braun student paper award judge. Ecological Society of America
annual meetings (1998, 1999, 2000, 2004, 2005).
Western Regional Coordinating Project on Revegetation and
Stabilization of Deteriorated and Altered Lands - WRCC-21 (2001, president;
1996-present, member).
Symposium Session Moderator: Arid regions monitored by satellites:
from observing to modeling for sustainable management. Marrakech, Morocco
(2001).
USDA-NRI Biology of Weedy and Invasive Plants Program Panel (2001,
2004, 2005 member).
NSF-DBI Multi-user Equipment and Instrumentation Resources for
Biological Sciences Program Panel (2005 member)
NEON-BASIN Workshop organizer (September, December 2004, February
2005).
Rocky Mountain Ecological Observatory (ROMEO) Steering Committee
member (2005-present)
Reviewer of grant proposals: NSF, NASA, USDA-NRI, International Arid
Lands Consortium, USDA-Hatch, Fulbright Scholar Program, WESTGEC (2005: NSF-MUE
11; NSF-ESP 3; USDA-NRI 18; External reviewer for 1 proposal - National Agency
for Promotion of Science, Technology and Innovation, Administration of
Education, Science and Technology, Argentina), (2006: NSF-Ecology 1)
Reviewer of journal articles and books: Australian Journal of
Ecology, Biological
Invasions, BioScience, Canadian Journal of Forest
Research, Ecology, Ecological Applications, Global Change Biology, International Journal of
Plant Ecology, Journal
of Arid Environments,
Journal of Range Management, Journal of Vegetation Science, Oecologia, Plant Ecology, Plant and Soil, Water Resources Research, pre-publication ad hoc book review for Springer,
(2005: 2 Plant Ecology, 4 Oecologia, 1 Functional Plant Biology, 1 Plant and Soil, 1 Phyton). (2006: 2 Oecologia, 2 Rapid Communications in
Mass Spectrometry,
1 Global Change Biology, 1 Restoration Ecology, 1 Journal of Arid Environments, 1 internal peer review for
EPA, 1 Plant Ecology, 1 The Southwestern Naturalist)
Postdoctoral advisees
Former: Dr. Rico Gazal (May 2002
through August 2004)
Current: Victor Resco de Dios
(PhD, Rangeland Ecology and Watershed Management, Univ. of WY), Wei Sun (PhD,
Rangeland Ecology and Watershed Management, Univ. of WY), Jennifer Schomp (MS,
Rangeland Ecology and Watershed Management, Univ. of WY), Peter Koenig (PhD,
Ecology, Univ. of WY)
Completed: Kevin Hultine
(MS&PhD, Renewable Natural Resources, Univ. of AZ), Dan Potts (MS,
Rangeland Science and Management, Univ. of AZ), Angela Rickaway (MS, Wildlife
Management, Univ. of AZ), Sean Schaeffer (MS, Rangeland Science and Management,
Univ. of AZ), Keirith Snyder (PhD, Renewable Natural Resources, Univ. of AZ),
Cindy Salo (PhD, Renewable Natural Resources, Univ. of AZ), Enrico Yepez
(MS&PhD, Rangeland Science and Management, Univ. of AZ), Alessandra
Fravolini (PhD, Renewable Resources, Univ. of AZ), Patrick Ellsworth (MS,
Rangeland Ecology and Watershed Management, Univ. of WY)
Current: Laura Hudson (PhD,
Botany, Univ. of WY), Alex Eilts (PhD, Ecology and Evolutionary Biology, Univ.
of AZ), Nathan English (PhD, Geosciences, Univ. of AZ), Jonathan Adelman (MS, Botany, Univ. of WY), Jack
Fenner (PhD, Anthropology, Univ. of WY), Elizabeth Traver (MS, Botany, Univ. of
WY), Cat Campbell (MS, Geology and Geophysics, Univ. of WY), Kusum Naithani
(PhD, Botany, Univ. of WY), Sarah Bachman (MS, Botany, Univ. of WY)
Completed: Sharon Beidenbender
(PhD, Rangeland Science and Management, Univ. of AZ), Angel Bustamante-Gonzales
(PhD, Watershed Management, Univ. of AZ), Erika Geiger (MS, Rangeland Science
and Management, Univ. of AZ), Heather Germaine (MS, Rangeland Science and
Management, Univ. of AZ), Jim Leenhouts (PhD, Hydrology, Univ. of AZ), Elise
Pendall (PhD, Geosciences, Univ. of AZ), Lisa Pedicino (MS, Renewable Natural
Resources, Univ. of AZ), Pete Van de Water (PhD, Geosciences, Univ. of AZ),
Jake Weltzin (PhD, Renewable Natural Resources, Univ. of AZ), Carolyn Watson,
(PhD, Rangeland Science and Management, Univ. of AZ), Tom Wilson (PhD, Soil,
Water and Environmental Science, Univ. of AZ), Ed Wright (PhD, Geosciences,
Univ. of AZ)
Sandra Zencich, Edith Cowan
University, School of Natural Sciences, Perth, Australia (2003)
Current: Ayme Ahrens (EPSCoR Undergraduate Research Fellow, Univ. of WY), Rachel Griess (UWSIF technician), Paul Malsom (research technician), Caitlin Borbely (UWSIF technician), Joseph Van Court (UWSIF technician)
Completed: Patrick Ellsworth
(Beckman Foundation Scholar and Undergraduate Biology Research Program, Univ.
of AZ), Rachel Spigler (Honors thesis, Univ. of AZ), Ingrid Balsa (Conservation
Ecology Intern, Univ. of AZ), Matt Iles (Undergraduate Biology Research
Program, Univ. of AZ), Cheryl Carnes (Honors thesis, Univ. of AZ), Seth Hansen
(lab technician, Univ. of WY)
University of Wyoming: Mae Peterson (Botany minor, 2005-2007), Chris
Pompy (REWM, 2004-2006), Brandon Reynolds (REWM, 2005-2007)
Bethany Smith (SRAP Program, University of Wyoming, 2004)
Courses taught
Taxonomy of Native Plants � RNR
202 / 3 units (fall semesters 1996 through 2001). 100% responsibility.
Natural Resources Ecology � RNR
316 / 3 units (fall semesters 1996 through 2001). 10% responsibility (8
lectures/sem).
Rangeland and Forest Vegetation
Management � RAM 446/546 / 4 units (spring semesters 1996, 1997, 1998, 2000).
50% responsibility.
Functional Ecology of Aridland
Plants � RAM 570 / 2 units (spring semesters 1997, 2000, 2002). 100%
responsibility.
Use of Stable Isotopes in
Ecological Research � RAM 696a/GEOS 696a / 1 credit seminar (Spring 1997). 50%
responsibility.
Biological Invasions:
Theoretical and Practical Perspectives � RNR/RAM 696a / 1 credit seminar
(Spring 1999). 40% responsibility.
Plant-water interactions across
multiple scales � RAM 696a / 1 credit seminar (Fall 2001). 50% responsibility.
The
University of Utah:
Stable Isotope Ecology � Biology 5475, intensive 2-week graduate course (summers 1998, 2001, 2002, 2003, 2004). I lead a group of 6-8 students in the laboratory portion of this course and present one lecture.
University
of Wyoming:
Rangeland Plant Ecophysiology �
REWM 3500 / 3 units (fall semesters 2003 to present). 100% responsibility.
Stable Isotope Ecology � RNEW
5500 / 3 units (Fall, 2005). 100% responsibility.
Ecological Applications of
Stable Isotopes � REWM 5990 / 1 unit (Fall, 2003). 100% responsibility.
RAD �Research across
disciplines� seminar � REWM 5985 / 1 unit (Spring, 2004). 50% responsibility.
RAD �Research across
disciplines� seminar � REWM 5985 / 1 unit (Fall, 2004). 50% responsibility.
RAD �Research across
disciplines� seminar � REWM 5985 / 1 unit (Spring, 2005). 50% responsibility.
Professional References
Dr. R. Alan
Black, Professor
Department of
Biological Sciences
Washington State
University
PO Box 644236
Pullman, WA
99164-4236
Ph: 509-335-0179
Email: blackra@wsu.edu
Dr. David D.
Briske, Professor
Department of
Rangeland Ecology and Management
Texas A&M
University
College Station
TX 77843-2126
Ph: 979-845-5581
Email: dbriske@rlem.tamu.edu
Dr. James R.
Ehleringer, Professor
Department of
Biology
University of
Utah
257 South 1400
East
Salt Lake City,
UT 84112-0840
Ph: 801-581-7623
Email: Ehleringer@bioscience.utah.edu
Dr. R. David
Evans, Associate Professor
Department of
Biological Sciences
University of
Arkansas
601 Science
Engineering Bldg.
Fayetteville,
Arkansas 72701
Ph: 501-575-7093
Email: devans@comp.uark.edu
Dr. Richard N.
Mack, Professor
Department of
Biological Sciences
Washington State
University
PO Box 644236
Pullman, WA
99164-4236
Ph: 509-335-3316
Email: rmack@wsu.edu
Dr. David
Goodrich
Research
Hydraulic Engineer
USDA-ARS,
Southwest Watershed Research Center
2000 E. Allen Rd.
Tucson, AZ
85719
Ph: 520-670-6381
ext. 144
Email: goodrich@tucson.ars.ag.gov