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PhD Biology. University of Miami, in progress.
MS Rangeland Ecology and Watershed Management. University of Wyoming, 2006
BS Ecology and Evolutionary Biology. University of Arizona, 2003
BS Plant Biology with minor emphasis in Chemistry. University of Arizona, 2002
Awards and Honors
University of Miami Fellowship, 2005-present
Pressley-Bryan Scholarship, 2002
Beckman Foundation Scholar Fellowship, 2000-2001
Undergraduate Biology Research Program Scholar, 2001-2002
Warren C. Gill Memorial Scholarship, 2001-2002
Excellence in the Biological Sciences Scholarship, 2001
Kingston J. Smallhouse Scholarship, 2000-2001
Dean’s List and Honorable Mention, 1996-1997, 2000-2002
University of Arizona President's Award for Excellence Scholarship, 1996-97, 2000-02
Plant Science Department Scholarship, 1996-1997
The University of Arizona Alumni Scholarship, 1996-1997
University of Arizona High School Biology Apprenticeship Program Scholar, 1995-1996
2005-present Research fellow and PhD student. University of Miami, Coral Gables, FL, USA. Advisor: Dr. Leonel Sternberg, Professor
Project 1: Linking leaf traits with root structure and function in a subtropical seasonal forest
Project 2: Predicting oxygen isotope ratios of soil respired CO2 in a topographically complex landscape
Project3: Hydrogen fractionation during uptake by halophytic woody plants
2003-2005 Research Assistant and Master’s student. University of Wyoming Stable Isotope Facility, Laramie, WY, USA. Advisor: Dr. David Williams
Thesis title: “Hydrogen fractionation during water uptake by woody xerophytes”
2000-2003 Beckman Fellow and Research assistant. Plant Physiological Ecology Lab, University of Arizona, Advisor: David Williams.
Research title: Water source partitioning using stable isotopes of velvet mesquite (Prosopis velutina) in the Upper San Pedro River Basin
1997 Research Assistant. Animal Ecology Lab at Utah State University. Yuma, AZ, Advisor: Kevin Young, PhD candidate. Assisted in behavioral trials and mapping distribution and population density of flat-tailed horned lizard (Phrynosoma mcallii)
1995-1997 Research Assistant. Plant Physiology Lab at The University of Arizona. Advisor: Dr. Kathryn Taylor
Project 1: The production of the wound-inducible protein chitinase as part of the plant pathogenic response of Citrus
Project 2: Transformation of Citrus aurontifolium and ‘Troyer’ citrange by Agrobacterium tumefaciens
Fall 2007 Teaching Assistant, Introductory biology laboratories, University of Miami
Fall 2008 Prepared and taught molecular ecology lab on RFLP, University of Miami
Saha S, Strazisar TM, Menges ES, Ellsworth PZ, and Sternberg LdaSL. (2008) Linking the patterns in soil moisture to leaf water potential, stomatal conductance, growth, and mortality of dominant shrubs in the Florida scrub ecosystem DOI 10.1007/s11104-008-9684-3
Ellsworth PZ and DG Williams (2007) Hydrogen isotope fractionation during water uptake by woody xerophytes. Plant and Soil 291: 93-107
Scott RL, D Goodrich, L Levick, R McGuire, WL Cable, DW Williams, R Gazal, E Yepez, PZ 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.
Scott RL, DC Goodrich, L Levick, R McGuire, WL Cable, DG Williams, R Gazal, E Yepez, PZ 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.
Publications in preparation
Ellsworth, PZ and DG Williams. (in prep) Contribution of deep unsaturated-zone soil water to transpiration of a facultative phreatophyte. For submission to Water Resources
Scott R, Yepez EA, Ellsworth PZ, Williams DG. (in prep) Partitioning evapotranspiration and water source use among plant functional types in a desert riparian ecosystem. For submission to the Journal of Hydrology.
Sun J, Oncley S, Stephens B, Watt A, Burns S, Campos T, Aulenbach S, Lenschow D, Tschudi D, Monson R, Hu J, Schimel D, de Wekker S, Lai C-T, Lamb B, Anderson D, Ojima D, Zhong S, Clements C, Ellsworth PZ, Sternberg LdaSL. (in prep) A multiscale investigation of CO2 flow across local and regional mountain domains
EA, Gazal R, Ellsworth
PZ, Williams DG. (in prep.) Heterogeneous water and carbon
fluxes in the
understory of a semiarid savanna woodland following precipitation
submission to Oecologia.
Yepez EA, Gazal R, Ellsworth PZ, Williams DG. (in prep.) Responses of net ecosystem fluxes of carbon and water to leaf area removals in the sagebrush steppe. For submission to Rangeland Ecology and Management
Oral presentations and Invited seminars
Ellsworth PZ and Sternberg L da S L (2007) Linking roots and leaves in a seasonal forest. University of Puerto Rico, San Juan, PR. invited seminar
Ellsworth PZ and DG Williams (2007) Hydrogen isotope fractionation during water uptake by woody xerophytes. Florida Society of Ecologists and Evolutionary Biologists, Lake Placid, FL. oral presentation
Ellsworth PZ, DG Williams, RL Scott and EA Yepez (2005) Contribution of deep unsaturated-zone soil water to transpiration of a facultative phreatophyte. University of Wyoming Graduate Symposium, Laramie, WY. oral presentation
DG Williams, RL
Scott and EA Yepez (2004) Contribution of deep unsaturated-zone soil
transpiration of a facultative phreatophyte. 89th Annual Meeting of the
Ecological Society of America, Portland, OR. oral presentation
Ellsworth PZ, L da S L Sternberg, D Schimel, R K Monson (2008) Predicting oxygen isotope ratios of soil-respired CO2 across topographically complex terrain. Isoscapes 2008, Santa Barbara, CA.
Ellsworth PZ and DG Williams (2003) Water Use By Velvet Mesquite Prosopis velutina. Fourteenth Annual Undergraduate Biology Research Conference, Tucson, AZ.
PZ Ellsworth, EA Yepez, WL Cable, KR Hultine, and DG Williams (2002) Partitioning evapotranspiration fluxes and sources in desert floodplain ecosystems. Proc. Ecol. Soc. Am. 87th Annual Meetin, Tucson, AZ.
Ellsworth PZ and DG Williams (2001) Water Use by Velvet Mesquite Prosopis velutina” Beckman Foundation Conference of the Chemical and Biological Sciences, Irvine, CA.
Hultine KR, WL Cable, DG Williams, PZ Ellsworth, and RL 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 DG, RL Scott, G Lin, D Martens, E Yepez, PZ Ellsworth, WL Cable, J van Haren, and D Pierce (2001) Seasonal dynamics of water, carbon, and energy fluxes in mesquite woodland: project overview and preliminary results. Eos Trans. AGU, 82(47), Fall Meet. Suppl., Abstract B41A-07.
The National Ecological Observatory Network (NEON) workshop, Santa Barbara, CA, 2008.
Developed a plan for measuring and collecting stable isotope data in the 10 NEON nationwide observatories
Ecological Society of America (ESA)
National Geographic Society
English and Portuguese
My research interest is to understand how root structure and function influences nutrient and water uptake at the root system level, survival and adaptation at the plant level, and plant community structure and water and nutrient cycling at the ecosystem level. Unfortunately root systems remain a virtual blackbox because plants are mainly studied from the soil up, even though roots comprise approximately 50% of all plant biomass and are the primary organs for nutrient and water uptake. How plants respond to changes in water and nutrient availability, climate, and land-use is in part explained through root function and structure. Linking above- and belowground processes better explains whole plant adaptations, which then leads to more accurate predictions of community and ecosystem-level processes.
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