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Filter Total Items: 2,154
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Year Published: 2018

Influences of the invasive tamarisk leaf beetle (Diorhabda carinulata) on avian diets along the Dolores River in Southwestern Colorado USA

The tamarisk leaf beetle (Diorhabda carinulata), introduced from Eurasia in 2001 as a biological control agent for the invasive plant Tamarix ramosissima, has spread widely throughout the western USA. With D. carinulata now very abundant, scientists and restoration managers have questioned what influence this introduced arthropod...

van Riper, Charles; Puckett, Sarah L.; Darrah, Abigail J.
van Riper III, C., Puckett, S.L., Darrah, A.J., 2018, Influences of the Tamarisk Leaf Beetle (Diorhabda carinulata) on bird diets along the Dolores River in Southwestern Colorado USA: Biological Invasions, online, https://doi.org/10.1007/s10530-018-1764-6.

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Year Published: 2018

Exclusion of small mammals and lagomorphs invasion interact with human-trampling to drive changes in topsoil microbial community structure and function in semiarid Chile

Species losses and additions can disrupt the relationship between resident species and the structure and functioning of ecosystems. Persistent human-trampling, on the other hand, can have similar effects through the disruption of biocrusts on surface soils of semiarid systems, affecting soil stability and fixation of carbon and nitrogen...

Alfaro, Fernando D.; Manzano, Marlene; Abades, Sebastian; Trefault, Nicole; de la Iglesia, Rodrigo; Gaxiola, Aurora; Marquet, Pablo A.; Gutierrez, Julio R.; Meserve, Peter L.; Kelt, Douglas A.; Belnap, Jayne; Armesto, Juan J.
Alfaro, F.D., Manzano, M., Abades, S., Trefault, N., de la Iglesia, R., Gaxiola, A., Marquet, P.A., Gutierrez, J.R., Meserve, P.L., Kelt, D.A., Belnap, J., and Armesto, J.J., 2018, Exclusion of small mammals and lagomorphs invasion interact with human-trampling to drive changes in topsoil microbial community structure and function in semiarid Chile: Soil Biology and Biochemistry, v. 124, p. 1-10, https://doi.org/10.1016/j.soilbio.2018.05.019.

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Year Published: 2018

Conceptual and numerical models of dissolved solids in the Colorado River, Hoover Dam to Imperial Dam, and Parker Dam to Imperial Dam, Arizona, California, and Nevada

Conceptual and numerical models were developed to understand and simulate monthly flow-weighted dissolved-solids concentrations in the Colorado River at Imperial Dam. The ability to simulate dissolved-solids concentrations at this location will help the Bureau of Reclamation satisfy the binational agreement on the volume and salinity of Colorado...

Anning, David W.; Coes, Alissa L.; Mason, Jon P.
Anning, D.W., Coes, A.L., and Mason, J.P., 2018, Conceptual and numerical models of dissolved solids in the Colorado River, Hoover Dam to Imperial Dam, and Parker Dam to Imperial Dam, Arizona, California, and Nevada: U.S. Geological Survey Scientific Investigations Report 2018–5108, 34 p., https://doi.org/10.3133/sir20185108.

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Year Published: 2018

Life history characteristics may be as important as climate projections for defining range shifts: An example for common tree species in the intermountain western US

AimPredictions of future suitable habitat for plant species with climate change are known to be affected by uncertainty associated with statistical approaches, climate models and occurrence records. However, life history characteristics related to dispersal and establishment processes as well as sensitivity to barriers created by land‐use may also...

Copeland, Stella M.; Bradford, John B.; Duniway, Michael C.; Butterfield, Bradley J.
Copeland, S.M., Bradford, J.B., Duniway, M.C., and Butterfield, B.J., 2018, Life history characteristics may be as important as climate projections for defining range shifts--An example for common tree species in the intermountain western US: Diversity and Distributions, online, https://onlinelibrary.wiley.com/doi/abs/10.1111/ddi.12813.

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Year Published: 2018

STEPWAT2: An individual‐based model for exploring the impact of climate and disturbance on dryland plant communities

The combination of climate change and altered disturbance regimes is directly and indirectly affecting plant communities by mediating competitive interactions, resulting in shifts in species composition and abundance. Dryland plant communities, defined by low soil water availability and highly variable climatic regimes, are particularly vulnerable...

Palmquist, Kyle A.; Bradford, John B.; Martin, Trace E.; Schlaepfer, Daniel R.; Lauenroth, William K.
Palmquist, K.A., Bradford, J.B., Martyn, T.E., Schlaepfer, D.R., and Lauenroth, W.K., 2018, STEPWAT2--An individual-based model for exploring the impact of climate and disturbance on dryland plant communities: Ecosphere, v. 9, no. 8, https://doi.org/10.1002/ecs2.2394.

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Year Published: 2018

Biocrusts: The living skin of the Earth

Biological soil crusts (biocrusts) form a “living skin” at the soil surface in many low productivity ecosystems around the world including water- and cold-limited environments, and early successional seres (Belnap et al. 2003). They may be composed of any configuration of soil surface-dwelling cyanobacteria, eukaryotic algae, lichens, mosses or...

Bowker, Matthew A.; Reed, Sasha C.; Maestre, Fernando T.; Eldridge, David J.
Bowker, M.A., Reed, S.C., Maestre, F.T., and Eldridge, D.J., 2018, Biocrusts--The living skin of the Earth: Plant and Soil, v. 429, no. 1-2, p. 1-7, http://dx.doi.org/10.1007/s11104-018-3735-1.

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Year Published: 2018

Beyond traditional ecological restoration on the Colorado Plateau

The Colorado Plateau is one of North America's five major deserts, encompassing 340,000 km2 of the western U.S., and offering many opportunities for restoration relevant to researchers and land managers in drylands around the globe. The Colorado Plateau is comprised of vast tracts of public land managed by local, state, and federal agencies...

Winkler, Daniel E.; Backer, Dana M.; Belnap, Jayne; Bradford, John B.; Butterfield, Bradley J.; Copeland, Stella M.; Duniway, Michael C.; Faist, Akasha M.; Fick, Stephen E.; Jensen, Scott L.; Kramer, Andrea T.; Mann, Rebecca; Massatti, Robert; McCormick, Molly L.; Munson, Seth M.; Olwell, Peggy; Parr, Steve D.; Pfennigwerth, Alix; Pilmanis, Adrienne M.; Richardson, Bryce A.; Samuel, Ella; See, Kathy; Young, Kristina E.; Reed, Sasha C.
Winkler, D.E., Backer, D.M., Belnap, J., Bradford, J.B., Butterfield, B.J., Copeland, S.M., Duniway, M.C., Faist, A.M., Fick, S.E., Jensen, S.L., Kramer, A.T., Mann, R., Massatti, R.T., McCormick, M.L., Munson, S.M., Olwell, P., Parr, S.D., Pfennigwerth, A.A., Pilmanis, A.M., Richardson, B.A., Samuel, E., See, K., Young, K.E., and Reed, S.C., 2018, Beyond traditional ecological restoration on the Colorado Plateau: Restoration Ecology, online, https://doi.org/10.1111/rec.12876.

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Year Published: 2018

Probabilistic models of seafloor composition using multispectral acoustic backscatter: The benthic detectorists

We describe and compare two probabilistic models for task-specific seafloor characterization based on multispectral backscatter. We examine whether generative or discriminative approaches to supervised seafloor characterization do better at harnessing the greatly increased information about seafloor substrate composition that is encoded in the...

Buscombe, Daniel; Grams, Paul E.; Kaplinski, Matthew
Buscombe, D., Grams, P., and Kaplinski, M., 2018, Probabilistic models of seafloor composition using multispectral acoustic backscatter: Austin, Tex., R2Sonic Multispectral Backscatter Competition Entry, p. 1-29, online download available at https://www.r2sonic.com/geohab2018/.

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Year Published: 2018

Effect of spatial and temporal scale on simulated groundwater recharge investigations

Hydrologic model input datasets such as climate, land use, elevation, soil, and geology information are available in a range of scales for use in water resources investigations. Smaller spatial and temporal scale input data allow groundwater recharge models to simulate more physically realistic processes and presumably result in more accurate...

Tillman, Fred; Pruitt, Tom; Gangopadhyay, Subhrendu
Tillman, F.D, Pruitt, T., and Gangopadhyay, S., 2018, Effect of spatial and temporal scale on simulated groundwater recharge investigations: Advances in Water Resources, 119, p. 257-270

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Year Published: 2018

Mapping and measuring aeolian sand dunes with photogrammetry and LiDAR from unmanned aerial vehicles (UAV) and multispectral satellite imagery on the Paria Plateau, AZ, USA

The Paria Plateau is a potentially important but relatively unstudied aeolian sand source area in the Grand Canyon region of Arizona, USA. This study used unmanned aerial vehicle(UAV) - based LiDAR and structure-from-motion (SfM) photogrammetry to produce high-resolution topographic models of aeolian dunes on the plateau. We...

Solazzo, Daniel; Sankey, Joel B.; Sankey, Temuulen T.; Munson, Seth M.
Solazzo, D., Sankey, J.B., Sankey, T.T., and Munson, S.M., 2018, Mapping and measuring aeolian sand dunes with photogrammetry and LiDAR from unmanned aerial vehicles (UAV) and multispectral satellite imagery on the Paria Plateau, AZ, USA: Geomorphology, v. 319, p. 174-185, https://doi.org/10.1016/j.geomorph.2018.07.023.

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Year Published: 2018

Brackish groundwater and its potential as a resource in the southwestern United States

Secure, reliable, and sustainable water resources are fundamental to food production, energy independence, and the health of humans and ecosystems. But the large-scale development of fresh groundwater resources has stressed aquifers in some areas, causing declines in the amount of groundwater in storage and decreases in discharge to surface-water...

Anning, David W.; Beisner, Kimberly R.; Paul, Angela P.; Stanton, Jennifer S.; Thiros, Susan A.
Anning, D.W., Beisner, K.R., Paul, A.P., Stanton, J.S., and Thiros, S.A., 2018, Brackish groundwater and its potential as a resource in the southwestern United States: U.S. Geological Survey Fact Sheet 2018–3010, 6 p., https://doi.org/10.3133/fs20183010.

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Year Published: 2018

Patterns of longer-term climate change effects on CO2 efflux from biocrusted soils differ from those observed in the short term

Biological soil crusts (biocrusts) are predicted to be sensitive to the increased temperature and altered precipitation associated with climate change. We assessed the effects of these factors on soil carbon dioxide (CO2) balance in biocrusted soils using a sequence of manipulations over a 9-year period. We warmed biocrusted soils by 2 and, later...

Darrouzet-Nardi, Anthony; Reed, Sasha C.; Grote, Edmund E.; Belnap, Jayne
Darrouzet-Nardi, A., Reed, S.C., Grote, E.E., and Belnap, J., 2018, Patterns of longer-term climate change effects on CO2 efflux from biocrusted soils differ from those observed in the short term: Biogeosciences, v. 15, p. 4561-4573, https://10.5194/bg-15-4561-2018.

Filter Total Items: 239
June 15, 2016

Running Rivers

What inspired a USGS geologist to study how dam removal changes rivers. Profile of Amy East.

Alaska field team
June 5, 2016

Alaska field team

The field team included USGS geologists Rob Witter, Adrian Bender, Chris DuRoss, Peter Haeussler, Richard Lease and Kate Scharer

Fairweather fault lidar
June 5, 2016

Fairweather fault lidar

Fairweather fault lidar 

Glacier National Park
June 5, 2016

Glacier Bay National Park

View of Glacier Bay National Park from the air.

Fairweather Fault
June 5, 2016

Fairweather Fault

USGS research geologist Kate Scharer with her finger on the Fairweather Fault in southeast Alaska. The magnitude 7.8 Lituya Bay earthquake caused shaking that toppled trees along the fault, which left a break in the forest shown here.

South Crillon Glacier
June 5, 2016

South Crillon Glacier

Nearly 60 years after a magnitude 7.7 earthquake struck Lituya Bay, Alaska — leading to a tsunami that devastated the area — six U.S. Geological Survey geologists revisited the isolated region of Alaska, to pick up where their scientific predecessors left off. In this photo, members of the USGS research team pause to take in the view of South Crillon Glacier from a study

...
South Crillon Glacier
June 5, 2016

South Crillon Glacier

Periodic calving of ice from the snout of South Crillon Glacier.

Glacier Bay National Park
June 5, 2016

Glacier Bay National Park

Trench site along the southern Fairweather Fault, in Glacier Bay National Park, Alaska. The alluvial fan at left consists of lake, stream channel and debris flow deposits impounded by the Fairweather Fault scarp, at right.

June 3, 2016

Particle Tracking

The Arizona Water Science Center discusses the use of a new method, called particle tracking, that will revolutionize the way USGS obtains stream flow data.

May 31, 2016

Breaking Down Reefs, Building Up Beaches

On the remote western coast of Australia lies a UNESCO World Heritage Site above and below the sea. Researchers from the U.S. Geological Survey and University of Western Australia convened here at Ningaloo Reef and Jurabi Coastal Reserve to embark on the most extensive study EVER done into how coral reefs shape our coasts.
 

May 20, 2016

Shaking of Frontier Building — Anchorage, Alaska, During Mw7.1 Earthquake, January 24, 2016

This video presents a visualization of shaking that was recorded in the Frontier Building in Anchorage, Alaska, during the Mw7.1 earthquake, January 24, 2016, Iniskin, Alaska. It exhibits how a tall building behaves and performs during strong earthquake shaking. Note that relative to the height of the building, the motions are magnified by a factor of 300 to show

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April 19, 2016

USGS: More Than a Workplace

Employees of the Arizona Water Science Center describe their experiences working for the USGS revealing that it is far more than just a workplace.

Research and technical support provided by USGS makes a difference Some recent press releases and media advisories from the Pacific Region are highlighted below.

Filter Total Items: 72
Shaded relief image of the Santa Rosa area showing active faults
April 4, 2016

For the first time, scientists at the U.S. Geological Survey have mapped the active surface trace of the Rodgers Creek Fault through the central part of the northern California city of Santa Rosa. Urban development has, until now, obscured its exact location.

Image: High Water Measurements at USGS Site 11059300
March 4, 2016

El Niño is a phenomenon that occurs when unusually warm ocean water piles up along the equatorial west coast of South America. When this phenomenon develops, it affects weather patterns around the globe, including the winter weather along the west coast of North America. This unusual pattern of sea surface temperatures occurs in irregular cycles about three to seven years apart.

USGS
November 24, 2015

A new study completed by the U.S. Geological Survey, in cooperation with the Borrego Water District, will help water planners in the Borrego Valley, California better understand and manage the groundwater resources that the area relies on for drinking water, agriculture and recreation.

USGS
October 22, 2015

Joint Venture Silicon Valley and the U.S. Geological Survey today jointly announced a partnership to address regional challenges from natural hazards, climate and land use change, and continued availability of clean air and water resources.

USGS
October 14, 2015

MENLO PARK, Calif. — U.S. Geological Survey employees in Menlo Park, Calif. will participate in an earthquake safety drill, and test their emergency response plan as part of the Great ShakeOut on Oct. 15, an annual day of action to practice how to protect yourself from an earthquake.

Fumarole on Kīlauea Volcano, Hawaiʻi. Elemental sulfur vapor escaping from the fumarole has cooled to form yellow-colored crysta
October 5, 2015

Fumaroles are openings in the earth’s surface that emit steam and volcanic gases, such as sulfur dioxide and carbon dioxide. They can occur as holes, cracks, or fissures near active volcanoes or in areas where magma has risen into the earth’s crust without erupting. A fumarole can vent for centuries or quickly go extinct, depending on the longevity of its heat source.

USGS
October 1, 2015

This year, groundwater levels in many wells in California’s Central Valley are at or below historical low levels. In addition, from 2007 through 2015, land subsidence that correlates to areas with large groundwater level declines has strongly increased in two large agricultural areas near the towns of El Nido and Pixley, according to a new article by the U.S. Geological Survey.

Illustration: Study area showing boundaries of each of the seven greater sage-grouse management zones
September 10, 2015

OAKHURST, Calif. -- Overall fire threats to greater sage-grouse habitat are much higher in the western part of the species’ range than in the eastern part, according to a U.S. Geological Survey fire threats assessment study published today.

imaging from Mars
September 2, 2015

A new analysis of the largest known deposit of carbonate minerals on Mars helps limit the range of possible answers about how and why Mars changed from a world with watery environments billions of years ago to the arid Red Planet of today.

USGS
July 27, 2015

One winter's night in the year 1700, a mysterious tsunami flooded fields and washed away houses in Japan. It arrived without the warning that a nearby earthquake usually provides.

Map of sediment thickness in state waters offshore of San Francisco.
May 21, 2015

Three new sets of maps detail the offshore bathymetry, habitats, geology and submarine environment of the seafloor off the coast of San Francisco, Drakes Bay, and Tomales Point.

Nine USGS Science Centers are administered by the Pacific Regional office, which is headquartered in Sacramento, California.

The Pacific Region works with a wide array of partners across the country, including other Federal and state agencies, regional and local governments, academic institutions, research organizations, non-governmental organizations, and more.

Filter Total Items: 66