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Courses
  • CCDEE
    Climate Change and Dryland Ecosystem Ecology

  • CCAPNSSRM
    Climate Change Adaptation: Perspectives at the Nexus of Science, Society, & Resource Management

  • DEVD
    Dryland Ecohydrology and Vegetation Dynamics

  • PR
    Principles of Research

Grants
  • Funding agency logo
    Moving from Mortality to Recovery in Western Forests and Woodlands

    Co-Investigator (COI)

    2020

    $100.0K
    Active
  • Funding agency logo
    CNH-L: Revealing the Hidden Ecoclimate Teleconnections Between Forest and Agriculture in the U.S. Enables Novel Governance Strategies for a Telecoupled World

    Co-Investigator (COI)

    2018

    $1.4M
    Active
  • Funding agency logo
    RAPID: Collaborative Research: Testing Near-Term Ecological Forecasting Throughout Emerging Extreme Drought

    Principal Investigator (PI)

    2018

    $61.6K
  • Funding agency logo
    COLLABORATIVE RESEARCH: EAGER-NEON: Prototyping Assessment of Ecoclimate Teleconnections Affecting NEON Domains

    Principal Investigator (PI)

    2015

    $113.9K
  • Funding agency logo
    Collaborative Research: Ecoclimate Teleconnections between Amazonia and Temperate North America: Cross-Region Feedbacks among Tree Mortality, Land Use

    Principal Investigator (PI)

    2014

    $334.4K
  • Funding agency logo
    Transformative Behavior of Energy, Water and Carbon in the Critical Zone II: Interactions Between Long- and Short-Term Processes That Control Delivery of Critical Zone Services

    Co-Investigator (COI)

    2013

    $6.5M
  • Funding agency logo
    CZO: Transformative Behavior of Water, Energy and Carbon in the Critical Zone: An Observatory to Quantify Linkages Among Ecohydrology, Biogeochemistry

    Co-Investigator (COI)

    2009

    $4.3M
  • Funding agency logo
    Collaborative Research: Decomposition in Drylands: Soil Erosion and UV Interactions

    Co-Investigator (COI)

    2008

    $582.1K
  • Funding agency logo
    Determining Vegetation Responses to Global-Change-Type Drought Extremes: Will Warming Amplify Tree Die-Off?

    Principal Investigator (PI)

    2008

    $379.5K
  • Funding agency logo
    Ecohydrological Training to Address Semiarid Forest Ecosystem Health and Restoration

    Principal Investigator (PI)

    2006

    $195.0K
News
  • Women in climate change: Ellen McMahon

    2022

  • UArizona climate adaptation experts contribute to latest IPCC climate report

    2022

  • Five UA Faculty Members Named Regents' Professors

    2018

  • UA Architect Searches for Building Blocks to Fight Wildfires

    2017

  • Interdisciplinary Group Addresses Climate Change Through Art

    2015

  • The Art and Science of the Environment

    2015

  • UA Employees, Programs Honored

    2015

  • Art Professor Creates New World of Awareness

    2014

  • Eight From UA Contribute to National Climate Change Report

    2014

  • Climate Change Report Forecasts Major Impacts for the Southwest

    2013

  • Prestigious EPA Fellowships Go to Two UA Graduate Students

    2010

  • Researchers Call for 'No-Regrets' Approach to Climate Warming

    2010

  • Physical Impacts and Predictions: What Science Can Tell Us

    2009

  • Ecologist David D. Breshears Awarded Leopold Leadership Fellowship

    2009

  • AAAS Names Nine From UA to Fellows

    2009

  • UA Awarded $4.35M to Study Earth's Critical Zone

    2009

  • Biosphere 2 Experiment Shows How Fast Heat Could Kill Drought-Stressed Pine

    2009

  • Former Biospherian to Speak at Biosphere 2 March 8

    2008

  • Biosphere 2 Offers Special Events for Saturday Visitors

    2008

  • UA Researchers Contribute to U.S. Climate Change Science Program Report

    2008

  • UA, Five Other SW Universities Linked into Massive Ecological Research Network

    2007

  • The University of Arizona Launches Major Scientific Research Initiative at Biosphere 2

    2007

  • Underlying Cause of Massive Pinyon Pine Die-off Revealed

    2005

  • How cities use energy to regulate temperature – just like mammals

  • How cities use energy to regulate temperature – just like mammals

  • How cities use energy to regulate temperature – just like mammals

  • How cities use energy to regulate temperature – just like mammals

  • How cities use energy to regulate temperature – just like mammals

  • How cities use energy to regulate temperature – just like mammals

  • How cities use energy to regulate temperature – just like mammals

  • How cities use energy to regulate temperature – just like mammals

Publications (161)
Recent
  • Climate-driven, but dynamic and complex? A reconciliation of competing hypotheses for species' distributions

    2022

  • Mechanisms of woody plant mortality under rising drought, CO2, and vapor pressure deficit

    2022

  • Biological invasions and climate change amplify each other's effects on dryland degradation

    2022

  • Global field observations of tree die-off reveal hotter-drought fingerprint for Earth’s forests

    2022

  • Climate Change Effects on North American Fish and Fisheries to Inform Adaptation Strategies

    2021

  • Macrosystems as metacoupled human and natural systems.

    2021

  • Improved dryland carbon flux predictions with explicit consideration of water-carbon coupling

    2021

  • Evaluation of vegetation indices and imaging spectroscopy to estimate foliar nitrogen across disparate biomes

    2021

  • How deregulation, drought and increasing fire impact Amazonian biodiversity

    2021

  • The growing challenge of vegetation change

    2021

  • Radionuclide resuspension across ecosystems and environmental disturbances

    2021

  • Underappreciated plant vulnerabilities to heat waves

    2021

  • Reframing tropical savannization: linking changes in canopy structure to energy balance alterations that impact climate.

    2020

  • Forest management under megadrought: Urgent needs at finer scale and higher intensity.

    2020

  • Predicting drivers of collective soil function with woody plant encroachment in complex landscapes.

    2020

  • Bioclimatic envelopes for individual demographic events driven by extremes: Plant mortality from drought and warming.

    2019

  • Mechanisms of a coniferous woodland persistence under drought and heat.

    2019

  • Targeting extreme events: Complementing near-term ecological forecasting with rapid experiments and regional surveys.

    2019

  • Drought supersedes warming in determining volatile and tissue defenses of piñon pine (Pinus edulis).

    2019

  • Implicit assumptions of conceptual diagrams in environmental science and best practices for their illustration

    2018

  • Subcontinental heat wave triggers terrestrial and marine, multi-taxa responses

    2018

  • Research frontiers for improving our understanding of drought-induced tree and forest mortality

    2018

  • Continental-scale consequences of tree die-offs in North America: identifying where forest loss matters most

    2018

  • Chronic historical drought legacy exacerbates tree mortality and crown dieback during acute heatwave-compounded drought

    2018

  • Beyond greenness: Detecting temporal changes in photosynthetic capacity with hyperspectral reflectance data

    2017

  • A multi-species synthesis of physiological mechanisms in drought-induced tree mortality

    2017

  • Temperature response surfaces for mortality risk of tree species with future drought

    2017

  • Predicting Tree Mortality Die-off Events Associated with Hotter Drought and Assessing Their Global Consequences via Ecoclimate Teleconnections. (Invited)

    2017

  • Addendum: Multi-scale predictions of massive conifer mortality due to chronic temperature rise (vol 6, pg 295, 2016)

    2016

  • Candidate halophytic grasses for addressing land degradation: Shoot responses of Sporobolus airoides and Paspalum vagenitum to weekly increasing NaCl concentration

    2016

  • Understanding ecosystem services from a geosciences perspective

    2016

  • How drought-induced forest die-off alters microclimate and increases fuel loadings and fire potentials

    2016

  • Toward accounting for ecoclimate teleconnections: intra- and inter-continental consequences of altered energy balance after vegetation change

    2016

  • Multi-scale predictions of massive conifer mortality due to chronic temperature rise.

    2016

  • Synergistic ecoclimate teleconnections from forest loss in different regions structure global ecological responses

    2016

  • CO2 diffusion into pore spaces limits weathering rate of an experimental basalt landscape

    2016

  • Rangeland responses to predicted increases in drought extremity

    2016

  • Climate change velocity gaps for slow dispersing endemics: An example classification tree application for an endangered cactus in a bimodal precipitation regime

    2016

  • Rainfall intensity switches ecohydrological runoff/runon redistribution patterns in dryland vegetation patches

    2015

  • Understanding of ecosystem services from a geosciences perspective

    2015

  • Critical zone services: Expanding context, constraints, and curency beyond ecosystem services.

    2015

  • Sensitivity of regional evapotranspiration partitioning to variation in woody plant cover: insights from experimental dryland tree mosaics

    2015

  • Recent tree die-off has little effect on streamflow in contrast to expected increases from historical studies

    2015

  • On underestimation of global vulnerability to tree mortality and forest die-off from hotter drought in the Anthropocene

    2015

  • The Landscape Evolution Observatory: A large-scale controllable infrastructure to study coupled Earth-surface processes

    2015

  • Sunlight and soil–litter mixing: Drivers of litter decomposition in drylands

    2015

  • Critical Zone Services: Expanding Context, Constraints, and Currency beyond Ecosystem Services

    2014

  • Factoring in canopy cover heterogeneity on evapotranspiration partitioning: Beyond big-leaf surface homogeneity assumptions

    2014

  • Aeolian sediment and dust fluxes during predominant background wind conditions for unburned and burned semiarid grassland: Interplay between particle size and temporal scale

    2014

  • Interplay between particle size and temporal scale for predominant background wind conditions: Insights from burned vs. unburned semiarid grassland adjacent to urbanization

    2014

  • Progress on relationships between horizontal and vertical dust flux: Mathematical, empirical and risk-based perspectives

    2014

  • Incipient subsurface heterogeneity and its effect on overland flow generation – insight from a modeling study of the first experiment at the Biosphere 2 Landscape Evolution Observatory

    2014

  • Sunlight and soil-litter mixing: drivers of litter decomposition in drylands

    2014

  • Employing lidar to detail vegetation canopy architecture for prediction of aeolian transport

    2013

  • Modeling aeolian transport of soil-bound plutonium: considering infrequent but normal environmental disturbances is critical in estimating future dose

    2013

  • The critical amplifying role of increasing atmospheric demand on tree mortality and associated regional die-off

    2013

  • Global change-type drought-induced tree mortality: Vapor pressure deficit is more important than temperature per se in causing decline in tree health

    2013

  • Precipitation thresholds and drought-induced tree die-off: insights from patterns of Pinus edulis mortality along an environmental stress gradient

    2013

  • Nonstructural leaf carbohydrate dynamics of Pinus edulis during drought-induced tree mortality reveal role for carbon metabolism in mortality mechanism

    2013

  • Key landscape ecology metrics for assessing climate change adaptation options: rate of change and patchiness of impacts

    2013

  • Leveraging modern climatology to increase adaptive capacity across protected area networks

    2012

  • Drought-induced forest decline: Causes, scope and implications

    2012

  • Sediment capture by vegetation patches: Implications for desertification and increased resource redistribution

    2012

  • Non-structural leaf carbohydrate dynamics of Pinus edulis during drought-induced tree mortality reveal role for C metabolism in mortality mechanism

    2012

  • Ecohydrological Source-Sink Interrelationships between Vegetation Patches and Soil Hydrological Properties along a Disturbance Gradient Reveal a Restoration Threshold

    2012

  • Soil C and N patterns in a semiarid piñon-juniper woodland: Topography of slope and ephemeral channels add to canopy-intercanopy heterogeneity

    2012

  • Modeling aeolian transport in response to succession, disturbance and future climate: Dynamic long-term risk assessment for contaminant redistribution

    2012

  • Ecohydrological consequences of drought- and infestation- triggered tree die-off: Insights and hypotheses

    2012

  • Ecohydrological source-sink interrelationships between vegetation patches and soil hydrological properties ... reveal a restoration threshold

    2012

  • Ecohydrologic connections and complexities in drylands new perspectives for understanding transformative landscape change

    2012

  • Density-dependent ecohydrological effects of pinon-juniper woody canopy cover on soil microclimate and potential soil evaporation

    2012

  • Interactive effects of grazing and burning on wind- and water-driven sediment fluxes: Rangeland management implications

    2011

  • How water, carbon and energy driver Critical Zone evolution: The Jemez-Santa Catalina Critical Zone Observatory

    2011

  • How water, carbon, and energy drive critical zone evolution: the Jemez-Santa Catalina Critical Zone Observatory

    2011

  • Dust production following forest disturbances: health risks

    2011

  • When ecosystem services crash: Preparing for big, fast, patchy climate change

    2011

  • Aeolian processes and the biosphere

    2011

  • Decreased streamflow in semi-arid basins following drought-induced tree die-off: a counter-intuitive and indirect climate impact on hydrology

    2011

  • Extreme climatic event-triggered overstorey vegetation loss increases understorey solar input regionally:primary secondary ecological implications

    2011

  • On the ratio of wind-to-water-driven sediment transport: Conserving soil under global-change-type extreme events

    2011

  • When ecosystem services crash: preparing for big, fast patchy climate change

    2011

  • The interdependence of mechanisms underlying climate-driven vegetation mortality

    2011

  • Remotely sensed vegetation phenology and productivity along a climatic gradient: on the value of incorporating the dimension of woody plant cover

    2011

  • Evapotranspiration partitioning in a semiarid woodland: Ecohydrologic heterogeneity and connecitvity of vegetation patches

    2010

  • Soil carbon heterogeneity in piñon-juniper woodland patches: Effect of woody plant variation on neighboring intercanopies is not detectable

    2010

  • Climate-induced tree mortality: Earth system consequences

    2010

  • The ecology of dust

    2010

  • Seasonally pulsed heterogeneity in microclimate: Phenology and cover effects along deciduous grassland-forest continuum

    2010

  • Redistribution of runoff among vegetation patch types: On ecohydrological optimality of herbaceous capture of run-on

    2010

  • Ecohydrological controls of soil evaporation in deciduous drylands: How the hierarchical effects of litter, patch and vegetation mosaic cover interact with phenology and season

    2010

  • Partitioning evapotranspiration across gradients of woody plant cover: Assessment of a stable isotope technique

    2010

  • Ecohydrological energy inputs in semiarid coniferous gradients: Responses to management- and drought-induced tree reductions

    2010

  • A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests

    2010

  • Land degradation in drylands: Interactions among hydrologic-aeolian erosion and vegetation dynamics

    2010

  • Density-dependent shading patterns by Sonoran saguaros

    2010

  • Vegetation responses to extreme hydrological events: Sequence matters

    2009

  • Horizontal heterogeneity in the frequency of plant-available water with woodland intercanopy-canopy vegetation patch type rivals that occuring vertically by soil depth

    2009

  • Research communications research communications Tree die-off in response to global change-type drought: Mortality insights from a decade of plant water potential measurements

    2009

  • Toward a more holistic perspective of soil erosion: Why aeolian research needs to explicitly consider fluvial processes and interactions

    2009

  • Tracking the rhythm of the seasons in the face of global change: Phenological research in the 21 st century

    2009

  • A conceptual framework for dryland aeolian sediment transport along the grassland-forest continuum: Effects of woody plant canopy cover and disturbance

    2009

  • Ecohydrology bearings: Invited commentary to challenge paradigms, question assumptions, prioritize needs and enhance interdisciplinary dialogue

    2009

  • Phenological trend estimation: A reply to sagarin

    2009

  • Corrigendum to Thinning semiarid forests amplifies wind erosion comparably to wildfire: Implications for restoration and soil stability [J. Arid Environ. 72 (2008) 494-508] (DOI:10.1016/j.jaridenv.2007.08.006)

    2009

  • Vegetation synchronously leans upslope as climate warms

    2008

  • Foliar absorption of intercepted rainfall improves woody plant water status most during drought

    2008

  • Phenology of mixed woody-herbaceous ecosystems following extreme events: Net and differential responses

    2008

  • A dual Monte Carlo approach to estimate model uncertainty and its application to the rangeland hydrology and erosion model

    2008

  • Thinning semiarid forests amplifies wind erosion comparably to wildfire: Implications for restoration and soil stability

    2008

  • Comparing response of Pinus edulis tree-ring growth to five alternate moisture indices using historic meteorological data

    2008

  • Mechanisms of plant survival and mortality during drought: Why do some plants survive while others succumb to drought?

    2008

  • Fog interception by non-vascular epiphytes in tropical montane cloud forests: Dependencies on gauge type and meteorological conditions

    2008

  • Uranium partition coefficients (Kd) in forest surface soil reveal long equilibrium times and vary by site and soil size fraction

    2007

  • Climate-induced forest dieback as an emergent global phenomenon

    2007

  • Effects of topography and woody plant canopy cover on near-ground solar radiation: Relevant energy inputs for ecohydrology and hydropedology

    2007

  • Professional certification: Increasing ecologists' effectiveness

    2007

  • Evolving plans for the USA National Phenology Network

    2007

  • From dust to dose: Effects of forest disturbance on increased inhalation exposure

    2006

  • Regional vegetation die-off in response to global-change-type drought

    2005

  • Assessing contaminant transport vulnerability in complex topography using a distributed hydrologic model

    2005

  • Implementing a U.S. National phenology network

    2005

  • Ecohydrology monitoring and excavation of semiarid landfill covers a decade after installation

    2005

  • Spectral sensing of foliar water conditions in two co-occurring conifer species: Pinus edulis and Juniperus monosperma

    2005

  • Vegetation patches and runoff-erosion as interacting ecohydrological processes in semiarid landscapes

    2005

  • Spatial variability in rainfall erosivity versus rainfall depth: Implications for sediment yield

    2005

  • Drought stress and fluctuating asymmetry in Quercus undulata leaves: Confounding effects of absolute and relative amounts of stress?

    2005

  • Ecohydrological implications of woody plant encroachment

    2005

  • A multi-scale perspective of water pulses in dryland ecosystems: Climatology and ecohydrology of the western USA

    2004

  • 2004 Distinguished Scientific Achievement Award. Presented to F. Ward Whicker at the 49th annual meeting of the Health Physics Society, Washington, DC 11-15 July 2004.

    2004

  • Strategies for ecological extrapolation

    2004

  • Pulsed Redistribution of a Contaminant Following Forest Fire: Cesium-137 in Runoff

    2003

  • Hydraulic conductivity in a piñon-juniper woodland: Influence of vegetation

    2003

  • Extending the applicability of laser-induced breakdown spectroscopy for total soil carbon measurement

    2003

  • Ecohydrology of a resource-conserving semiarid woodland: Effects of scale and disturbance

    2003

  • Wind and water erosion and transport in semi-arid shrubland, grassland and forest ecosystems: Quantifying dominance of horizontal wind-driven transport

    2003

  • Temporal and spatial variation of episodic wind erosion in unburned and burned semiarid shrubland

    2002

  • The importance of rapid, disturbance-induced losses in carbon management and sequestration

    2002

  • Development of species dominance along an elevational gradient: Population dynamics of Pinus edulis and Juniperus monosperma

    2001

  • Measuring total soil carbon with laser-induced breakdown spectroscopy (LIBS)

    2001

  • Post-fire runoff and erosion from rainfall simulation: Contrasting forests with shrublands and grasslands

    2001

  • Simulating overland flow following wildfire: Mapping vulnerability to landscape disturbance

    2001

  • Spatial distributions of understory light along the grassland/forest continuum: Effects of cover, height, and spatial pattern of tree canopies

    2000

  • Interrelationships between plant functional types and soil moisture heterogeneity for semiarid landscapes within the grassland/forest continuum: A unified conceptual model

    1999

  • Runoff and erosion in a pinon-juniper woodland: Influence of vegetation patches

    1999

  • Viewpoint: Sustainability of pinon-juniper ecosystems - A unifying perspective of soil erosion thresholds

    1998

  • Effects of woody plants on microclimate in a semiarid woodland: Soil temperature and evaporation in canopy and intercanopy patches

    1998

  • Drought-induced shift of a forest-woodland ecotone: Rapid landscape response to climate variation

    1998

  • Overstory-imposed heterogeneity in solar radiation and soil moisture in a semiarid woodland

    1997

  • Scales of above-ground and below-ground competition in a semi-arid woodland detected from spatial pattern

    1997

  • Differential use of spatially heterogeneous soil moisture by two semiarid woody species: Pinus edulis and Juniperus monosperma

    1997

  • Interflow in semiarid environments: An overlooked process in risk assessment

    1997

  • Soil morphology of canopy and intercanopy sites in a pinon-juniper woodland

    1996

  • Response of North American ecosystem models to multi-annual periodicities in temperature and precipitation

    1994

  • Orchestrating environmental research and assessment for remediation

    1993

  • Estimation of radionuclide ingestion: The 'PATHWAY' food-chain model

    1990

  • Uncertainty in predictions of fallout radionuclides in foods and of subsequent ingestion

    1989

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