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The distribution and abundance of cheatgrass, an invasive annual grass native to Eurasia, has increased substantially across the Intermountain West, including the Great Basin. Cheatgrass is highly flammable, and as it has expanded, the extent and frequency of fire in the Great Basin has increased by as much as 200%. These changes in fire regimes are associated with loss of the native sagebrush, grasses, and herbaceous flowering plants that provide habitat for many native animals, including Greater Sage-Grouse. Changes in vegetation and fire management have been suggested with the intent of conserving Greater Sage-Grouse. However, the potential responses of other sensitive-status birds to these changes in management...
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California’s Central Valley is a nexus for water resources in the state, draining the Sacramento and San Joaquin River watersheds. Urban centers, agricultural operations, and the environment all compete for limited water, and demand is expected to only increase as the population grows and agriculture intensifies. At the same time, the water supply is projected to decrease as temperatures rise, precipitation patterns change, and the frequency of extreme droughts increases. The Central Valley also provides critical wetland habitats to migratory waterbirds, and wetland managers require information on how to best use water resources to support wildlife objectives, particularly during drought. This project seeks to...
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Resource managers must balance the impacts of competing management decisions on multiple, interacting natural systems. Hydrologic and ecological processes, such as groundwater fluctuations and riparian evapotranspiration, can be tightly coupled. Ideally, managers would have tools and models that include all processes to better understand how each management action would propagate through the environment. Because resources are limited, management tools that include only the most important processes may be more realistic. However, in some cases, omitting some interactions can lead to significant errors in predictions of hydrologic outcomes and ecological function, severely limiting a manager’s ability to identify...
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The Salt and Verde river basins in northeastern Arizona are a vital source of fresh water for the greater Phoenix metropolitan area and for two Native American tribes who rely on the basins’ natural resources for their livelihoods. The region depends on winter rain and snow to replenish the river basins’ water supply. Atmospheric rivers – long, narrow channels in the atmosphere that carry water vapor from the Pacific Ocean – supply a substantial portion of this winter precipitation. While atmospheric rivers are critical for maintaining water resources and preventing drought, they occasionally cause extreme storms that lead to flooding. Scientists project that climate change will affect the intensity and frequency...
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Native Nations face unique challenges related to climate change. Native Americans have a deep connection to the natural environment within which their livelihoods, cultural identity, and spiritual practices are rooted. Changes to water flow and hydrology, landscapes, and ecosystems, in combination with socio-economic and other factors, amplify tribal vulnerabilities to climate change. In the Southwest, tribes are already experiencing a range of impacts that are at least partially related to climate change. They include serious water quality and supply issues in the context of prolonged drought; reduced ability to grow or collect important traditional crops and raw materials; loss of forest resources from large and...
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In 2017, California was experiencing its most severe drought in over a millennia. Low rainfall and record high temperatures resulted in increased tree mortality and complete forest diebacks across the West. Though land managers scrambled to respond, they lacked information needed to make informed decisions. Focusing on California’s central and southern Sierra Nevada Mountains, this project seeks to determine whether a key forest management practice – forest thinning via prescribed fire – can help forests better survive drought. Prescribed fire is commonly used in the western U.S. to remove potential wildfire fuel, such as small trees and shrubs. It is also thought that this act of selectively removing trees helps...
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Mountain ecosystems are at risk from climate change and may be experiencing accelerated warming relative to lower environments. Understanding climatic and ecosystem processes at meso-, topo-, and micro-scales is limited, and constrains our ability to accurately evaluate vulnerability, and assess responses under future climates. Of special interest for climate studies are upper subalpine forests, the alpine treeline ecotone, and the alpine zones. We will use case-study ecosystems to address climatic processes and ecological responses at topo- and micro-scales, including: 1) treeline ecotone and role of phenotypic plasticity in Pinus albicaulis, 2) rocky ecosystems and Ochotona princeps, 3) demography of subalpine...
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Drought is one of the biggest threats facing our forests today. In the western U.S., severe drought and rising temperatures have caused increased tree mortality and complete forest diebacks. Forests are changing rapidly, and while land managers are working to develop long-term climate change adaptation plans, they require tools that can enhance forest resistance to drought now. To address this immediate need, researchers are examining whether a common forest management tool, prescribed fire, can be implemented to help forests better survive drought. Prescribed fire is commonly used in the western U.S. to remove potential wildfire fuel, such as small trees and shrubs. It is also thought that this act of selectively...
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In order for science to have the most impact on resource management, it needs to directly address the questions that managers and other stakeholders have. Essentially, the ways in which researchers and resource managers collaborate can affect the use of scientific information in decision-making. Previous research has shown that relatively more collaboration between researchers and resource managers (or even the general public) tends to lead to more and more effective use of new scientific information. However, we do not yet have good ways to evaluate these research processes or the outcomes we expect them to produce. This project will assess the key variables necessary for the successful production of usable climate...
    map background search result map search result map Possible Future Changes to Water Resources in the Salt and Verde River Basins Associated with Atmospheric River Events Assessing the Impacts of Restoration Efforts on Water and Natural Systems in a Changing World Fighting Drought with Fire: A Comparison of Burned and Unburned Forests in Drought-Impacted Areas of the Southwest Relations Among Cheatgrass, Fire, Climate, and Sensitive-Status Birds across the Great Basin Building Partnerships to Assess Tribal Adaptation to Climate Change and Science Needs in the Southwest The Impact of Drought on Waterbirds and Their Wetland Habitats in California’s Central Valley Can Prescribed Fire Help Forests Survive Drought in the Sierra Nevada Mountains? Producing Impactful Science: The Effect of Stakeholder Engagement Strategies on the Use of Climate Science in Management Decisions Response of High Mountain Ecosystems in the Great Basin to Historic and Future Climate Change Assessing the Impacts of Restoration Efforts on Water and Natural Systems in a Changing World Possible Future Changes to Water Resources in the Salt and Verde River Basins Associated with Atmospheric River Events The Impact of Drought on Waterbirds and Their Wetland Habitats in California’s Central Valley Can Prescribed Fire Help Forests Survive Drought in the Sierra Nevada Mountains? Response of High Mountain Ecosystems in the Great Basin to Historic and Future Climate Change Producing Impactful Science: The Effect of Stakeholder Engagement Strategies on the Use of Climate Science in Management Decisions Relations Among Cheatgrass, Fire, Climate, and Sensitive-Status Birds across the Great Basin Fighting Drought with Fire: A Comparison of Burned and Unburned Forests in Drought-Impacted Areas of the Southwest Building Partnerships to Assess Tribal Adaptation to Climate Change and Science Needs in the Southwest