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Streamflows in late spring and summer have declined over the last century in the western U.S. and mean annual streamflow is projected to decrease by six to 25% over the next 100 years. In arid and semi-arid regions of the western US, it is likely that some perennial streams will shift to intermittent flow regimes in response to climate-driven changes in timing and magnitude of precipitation, runoff, and evaporation. The project will address the following two research question: how will small stream (1st-3rd order) low flow hydrology be impacted by predicted longer, drier summers in the Upper Colorado River Basin under climate change and in turn, what will be the resulting impacts on riparian plant communities?...
Categories: Data, Project; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: AZ-01, Applications and Tools, Arizona, CO-03, Colorado, All tags...
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The Grassland, Shrubland, Desert Program of the U.S. Forest Service, Rocky Mountain Research Station intends to evaluate the interactive effects of fire and climate change on the presence and long-term persistence of native and non-native species within Rio Grande riparian and wetland habitats of the Desert and Southern Rockies LCCs. Decision support tools and maps will be produced that will help resource managers identify conditions and locations where biodiversity will be most affected by future changes and identify needs with respect to species conservation and invasive species management.This project was co-funded by multiple Landscape Conservation Cooperatives: Desert LCC and the Southern Rockies LCC.
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Solar development has the potential to have widespread impacts on the California desert. Thus, it is important to have as much information as possible regarding the impacts of facilities and related infrastructure on the natural ecosystem and surrounding desert communities, how current policies are influencing development, and how the federal process is working on evaluating solar development applications. This research is detailed in this website. "Renewable Energy in the California Desert: Mechanisms for Evaluating Solar Development on Public Lands" is the result of sixteen months of research conducted by ten graduate students from the University of Michigan School of Natural Resources and Environmen t through...
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Chihuahuan Desert landscapes exemplify the ecological conditions, vulnerability, and management challenges in arid and semi-arid regions around the world. The goal of the Jornada Basin Long Term Ecological Research program (JRN LTER) established in 1982 is to understand and quantify the key factors and processes controlling ecosystem dynamics and patterns in Chihuahuan Desert landscapes. In collaboration with the Jornada Experimental Range (USDA ARS), studies initiated in 1915 have been incorporated into the JRN LTER program. Previous research focused on desertification, a state change from perennial grasslands to woody plant dominance that occurs globally. Based on findings from growing long-term databases, the...
Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: CMQ3, Chihuahuan Desert, DLCC, Desert LCC, English, All tags...
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Biologists, engineers, planners and land managers from nine public agencies have worked together since 2004 to identify large blocks of protected habitat, the potential wildlife movement corridors through and between them, the factors that could possibly disrupt these linkage zones and opportunities for conservation. Recognizing that habitat connectivity is a landscape issue involving multiple land jurisdictions, this workgroup has engaged in unprecedented cooperation and facilitated discussions and partnerships to help ensure a unified approach to wildlife linkage conservation and management. This reinforces the commitment to and efficiency of wildlife connectivity measures undertaken by all stakeholders, using...
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Sky Island grasslands of central and southern Arizona, southern New Mexico and northern Mexico form the “grassland seas” that surround small forested mountain ranges in the borderlands. Their unique biogeographical setting and the ecological gradients associated with “Sky Island mountains” add tremendous floral and faunal diversity to these grasslands and the region as a whole. Sky Island grasslands have undergone dramatic vegetation changes over the last 130 years including encroachment by shrubs, loss of perennial grass cover and spread of non-native species. Changes in grassland composition and structure have not occurred uniformly across the region and they are dynamic and ongoing. In 2009, The National Fish...
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BLM’s Resource Management Plans (RMPs) form the basis for every action and approved use on the public lands. The BLM prepares RMPs for areas of public lands, called planning areas, which tend to have similar resource characteristics. Planning emphasizes a collaborative environment in which local, state, and tribal governments, the public, user groups, and industry work with the BLM to identify appropriate multiple uses of the public lands. Plans are periodically revised as changing conditions and resource demands require. RMPs are used by managers and the public to accomplish the following: Allocate resources and determine appropriate multiple uses for the public lands; Develop a strategy to manage and protect...
Synopsis: Riparian buffers, the vegetated region adjacent to streams and wetlands, are thought to be effective at intercepting and reducing nitrogen loads entering water bodies. Riparian buffer width is thought to be positively related to nitrogen removal effectiveness by influencing nitrogen retention or removal. We surveyed the scientific literature containing data on riparian buffers and nitrogen concentration in streams and groundwater to identify trends between nitrogen removal effectiveness and buffer width, hydrological flow path, and vegetative cover. Nitrogen removal effectiveness varied widely. Wide buffers (.50 m) more consistently removed significant portions of nitrogen entering a riparian zone than...
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U. S. Geological Survey (USGS) scientists completed a stream surveying campaign from the 25th of April to the 10th of June in 2022 at 100m reaches throughout 30 streams on the Delmarva Peninsula. The goal was to collect three cross sections, water surface elevation at the top and bottom of each reach, and thalweg point data at each study location to use the geomorphological surveys alongside habitat information. Together, these two sources of data can be used to create a habitat assessment of Delmarva Peninsula streams. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Significant ecological, hydrologic, and geomorphic changes have occurred during the 20th century along many large floodplain rivers in the American Southwest. Native Populus forests have declined, while the exotic Eurasian shrub, Tamarix, has proliferated and now dominates most floodplain ecosystems. Photographs from late 19th and early 20th centuries illustrate wide river channels with largely bare in-channel landforms and shrubby higher channel margin floodplains. However, by the mid-20th century, floodplains supporting dense Tamarix stands had expanded, and river channels had narrowed. Along the lower Green River in eastern Utah, the causal mechanism of channel and floodplain changes remains ambiguous due to...
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Many of the streams and aquifers that sustain Interior riparian deciduous forests in the US Southwest are being dewatered, yet we know little about how the plant communities are being affected by these hydrologic changes. This study found that several measures of biotic integrity, including Platanus wrightii xylem water potential, P. wrightii radial growth rate, tree species diversity, and woody plant wetland indicator scores, varied significantly with ground water depth and fluctuation among nine sites in Arizona. P. wrightii trees had highest productivity, and the forests had greatest compositional diversity, where ground water averaged less than 2 m below the tree base during the growing season and less than...
Aim: To test the hypothesis that anthropogenic alteration of stream-flow regimes is a key driver of compositional shifts from native to introduced riparian plant species. Location: The arid south-western United States; 24 river reaches in the Gila and Lower Colorado drainage basins of Arizona. Methods: We compared the abundance of three dominant woody riparian taxa (native Populus fremontii and Salix gooddingii, and introduced Tamarix) between river reaches that varied in stream-flow permanence (perennial vs. intermittent), presence or absence of an upstream flow-regulating dam, and presence or absence of municipal effluent as a stream water source. Results: Populus and Salix were the dominant pioneer trees along...
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Populus?Salix forests are a valued riparian vegetation type in western North America. These pioneer, obligate phreatophytes have declined on some rivers, raising conservation concerns and stimulating restoration plantings, but have increased on others. Understanding patterns and causes of forest change is essential for formulating conservation, restoration and management plans. Our goal was to assess spatio-temporal patterns of vegetation change on the Upper San Pedro River in semiarid Arizona, USA, one of the few undammed rivers in the region. Over 100 years ago, intense floods initiated channel incision and substantially altered hydrogeomorphology. Pioneer trees began to establish in the widening post-entrenchment...
We tested the hypothesis that decomposition in flood-inundated patches of riparian tree leaf litter results in higher plant-available nitrogen in underlying, nutrient-poor alluvium. We used leafpacks (n=56) containing cottonwood (Populus deltoides ssp. wislizenii) leaf litter to mimic natural accumulations of leaves in an experiment conducted on the Yampa River floodplain in semi-arid northwestern Colorado, USA. One-half of the leafpacks were set on the sandy alluvial surface, and one-half were buried 5 cm below the surface. The presence of NO3? and NH4+ presumed to result from a leafpack?s submergence during the predictable spring flood pulse was assessed using an ion-exchange resin bag (IER) placed beneath each...
This project will to improve the irrigated meadows on the Cokeville Meadows National Wildlife Refuge (NWR). Engineering and design will be provided to improve the condition of unused irrigation systems and pumps and to install additional head gates and dikes. Rehabilitation of about 7 miles of dike for the B-Q Canal; creating a grass bank at Cokeville Meadows NWR; planting and weed control will restore 1,300 acres of irrigated hay meadows on the Refuge that are currently unproductive; monitoring elk movement east of NWR. This project will improve irrigation efficiency and flooding of approximately 1,300 acres of hay meadows that are currently unproductive. These improvements will increase nesting habitat for the...
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Strategies – Include developing a grazing strategy that is adaptable to meet WLCI’s habitat needs and those of the property owner. This plan will include a reporting component to inform WLCI on observed results for this project including reestablishment of native riparian vegetation, wetland improvements, amount of forage left for wildlife use on hay pasture, and camera use to demonstrate wildlife uses during winter. Water resources - Partners Fish & Wildlife Services and NRCS are initiating wetland water improvement projects on this private property. There is also a proposed project to deepen a reservoir to improve habitat for water fowl. The project, via the landowner will reestablishing riparian plant species...
Riparian zones can strongly influence the exchange of nutrients between streams and their watersheds. Most riparian studies have been done in mesic watersheds, which differ significantly from arid-land watersheds hydrologically. The goals of our work were to determine the strength and direction of hydrologic linkages between stream and riparian zone, and to estimate the extent of uptake of streamwater N by riparian trees in Sycamore Creek, a Sonoran Desert stream. Br? and 15NH4+ were added simultaneously to the surface stream to trace water and N from stream to riparian zone. Br? concentrations in riparian wells installed downstream of the release point increased during the addition, demonstrating a strong hydrologic...
The Hay Reservoir project entails treating approximately 3000 acres for Russian knapweed and salt cedar invasion. Treatment would consist of the ground application of herbicide to control these noxious weeds in the area. There is also whitetop, Canada thistle, black henbane, halogeton, and Swainson’s pea. This area is important to deer, elk, antelope, and many other wildlife species. This project will directly reduce water wastage, erosion, and sedimentation into Hay Reservoir, located in the Great Divide Basin. It will also benefit Red Creek and Hay Reservoir proper, native vegetation, and the wildlife which use the water in this drainage. This area has also failed Standards for Healthy Rangelands due to the invasive...
This is an ongoing cooperative project to restore 6,100 ft of Savery creek. This joint project will improve native Colorado Cutthroat fish habitat, improve thermal and low flow habitat, and reduce bank erosion by approximately 1,000 cubic yards per year. Restoration will include narrowing the channel to accommodate for 220 cfs flows; excavating pools and installing fish-hook vane structures to improve low flow trout habitat; and re-establishing riparian vegetation to prevent further erosion. At a minimum, the project will include the following: moving three mid-channel bars, installing 14 fish-hook vanes, excavating 18 pools, installing 27 bank full benches to narrow the channel, installing 226 willow clumps...
map background search result map search result map Biotic integrity of Platanus wrightii riparian forests in Arizona: first approximation Savery Creek Restoration Hay Reservoir Weed Treatment A century of riparian forest expansion following extreme disturbance: Spatio-temporal change in Populus/Salix/Tamarix forests along the Upper San Pedro River, Arizona, USA B-Q Canal Rehabilitation, Wetlands Improvement, and Elk Movement Monitoring Modeling Low Stream Flows and Assessing the Ecological Impacts of Potential Stream Drying under Climate Change in the Upper Colorado River Basin Sibert Habitat Lease Vulnerability of Riparian Obligate Species in the Rio Grande to the Interactive Effects of Fire, Hydrological Variation and Climate Change Arizona's Wildlife Linkages Jornada Bibliography Renewable Energy in the California Desert U.S. Department of the Interior Bureau of Land Management Land Use Planning Sky Island Grassland Assessment Conservation Planning for the Colorado River in Utah - Proximity to human ignition sources for Fire Risk Model Delmarva Peninsula Stream Survey (2022) Jornada Bibliography Conservation Planning for the Colorado River in Utah - Proximity to human ignition sources for Fire Risk Model Sibert Habitat Lease Delmarva Peninsula Stream Survey (2022) Sky Island Grassland Assessment Vulnerability of Riparian Obligate Species in the Rio Grande to the Interactive Effects of Fire, Hydrological Variation and Climate Change Renewable Energy in the California Desert Arizona's Wildlife Linkages Biotic integrity of Platanus wrightii riparian forests in Arizona: first approximation Modeling Low Stream Flows and Assessing the Ecological Impacts of Potential Stream Drying under Climate Change in the Upper Colorado River Basin U.S. Department of the Interior Bureau of Land Management Land Use Planning