People

John Bradford jbradford @ usgs.gov

I am an applied ecosystem ecologist who works to understand how climate change and altered drought will interact with disturbances to impact dryland vegetation.  My research themes include climate-driven shifts in dryland ecological drought, changes in the structure and distribution of vegetation in sagebrush ecosystems, management options to enhance dry forest and woodland sustainability, and strategies for enhancing dryland restoration strategies in a warmer world.  I am a research ecologist with the USGS Northwest Climate Adaptation Science Center & Southwest Biological Science Center, located in Flagstaff, Arizona.

Daniel Schlaepfer dschlaepfer @ usgs.gov

ORCiD

I am a quantitative ecologist and developer of simulation models focusing on dryland ecohydrology, climate change, and plant ecology to understand responses of dryland ecosystems to warming climate, disturbances and land management. I work to understand how ecological drought interacts with dryland ecosystems across the western U.S. I am affiliated with the USGS Northwest Climate Adaptation Science Center & Southwest Biological Science Center and the Northern Arizona University, Center for Adaptable Western Landscapes.

Adam Noel ANoel @ usgs.gov

I am a postdoctoral researcher with the US Geological Survey and affiliated with Northern Arizona University's Center for Adaptable Western Landscapes. My research interests focus on plant responses to changing climate conditions across the Western US and how we communicate modeling results to land management practitioners. My specific foci are in pinyon-juniper woodlands, where I combine large inventory data with different types of models under a variety of future climate scenarios. In future work, I hope to apply my dissertation experience studying soil carbon sequestration in temperate forests to dryland ecosystems. 

Martin Holdrege mholdrege @ usgs.gov

ORCiD

I am a postdoctoral researcher affiliated with the USGS Southwest Biological Science Center and Northern Arizona University, Center for Adaptable Western Landscapes. I am especially interested in water-limited ecosystems and am currently studying the effects of climate change and disturbance (mostly wildfire and grazing) in sagebrush ecosystems across the western United States.  Previously I focused on the effects of increased precipitation intensity in western drylands.  

Gregor Siegmund     gsiegmund [at] usgs [dot] gov

I am a plant and quantitative ecologist interested in population and community responses to environmental variability. In particular, I am fascinated by how plants persist under abiotic and biotic unpredictability and uncertainty. As a post-doctoral research ecologist with the US Geological Survey’s Southwest Biological Science Center, I work to understand the environmental variables that influence plant regeneration in the Great Basin and the Colorado Plateau. My research synthesizes existing knowledge about priority restoration species to develop new models to forecast successful plant establishment in the western US drylands. In my dissertation, I studied the effect of temporal variability on the ecology and evolution of annual plants.

Alice Stears       astears [at] usgs [dot] gov

I am a postdoctoral researcher affiliated with the USGS Southwest Biological Science Center and Northern Arizona University, Center for Adaptable Western Landscapes. As a plant ecologist, I am interested in the impact of global change on the ecological processes that shape plant populations and communities. I am particularly excited about using creative statistical and computational approaches to answer questions and communicate about data and results with managers, conservationists, and the public. Currently, I'm contributing to projects focused on both short and long-term forecasting of ecological drought across the contiguous United States. My previous work has focused on trait-environment impacts on plant fitness, demographic modeling, R package development, and methods for time series modeling.