Regions

Southwest

Regions L2 Landing Page Tabs

Filter Total Items: 2,176
Publication Thumbnail
Year Published: 2018

The geomorphic legacy of water and erosion control structures in a semiarid rangeland watershed

Control over water supply and distribution is critical for agriculture in drylands where manipulating surface runoff often serves the dual purpose of erosion control. However, little is known of the geomorphic impacts and legacy effects of rangeland water manipulation infrastructure, especially if not maintained. This study investigated the...

Nichols, Mary H.; Magirl, Christopher S.; Sayre, N.F.; Shaw, Jeremy R.
Nichols, M. H., Magirl, C., Sayre, N. F., and Shaw, J. R. (2017) The geomorphic legacy of water and erosion control structures in a semiarid rangeland watershed. Earth Surf. Process. Landforms, doi: 10.1002/esp.4287.

Publication Thumbnail
Year Published: 2018

Viscous relaxation as a prerequisite for tectonic resurfacing on Ganymede: Insights from numerical models of lithospheric extension

Ganymede’s bright terrain formed during a near-global resurfacing event (or events) that produced both heavily tectonized and relatively smooth terrains. The mechanism(s) by which resurfacing occurred on Ganymede (e.g., cryovolcanic or tectonic), and the relationship between the older, dark and the younger, bright terrain are fundamental to...

Bland, Michael T.; McKinnon, William B.

Publication Thumbnail
Year Published: 2018

6th international conference on Mars polar science and exploration: Conference summary and five top questions

We provide a historical context of the International Conference on Mars Polar Science and Exploration and summarize the proceedings from the 6th iteration of this meeting. In particular, we identify five key Mars polar science questions based primarily on presentations and discussions at the conference and discuss the overlap between some of those...

Smith, Isaac B.; Diniega, Serina; Beaty, David W.; Thorsteinsson, Thorsteinn; Becerra, Patricio; Bramson, Ali; Clifford, Stephen M.; Hvidberg, Christine S.; Portyankina, Ganna; Piqueux, Sylvain; Spiga, Aymeric; Titus, Timothy N.
Isaac B. Smith, Serina Diniega, David W. Beaty, Thorsteinn Thorsteinsson, Patricio Becerra, Ali M. Bramson, Stephen M. Clifford, Christine S. Hvidberg, Ganna Portyankina, Sylvain Piqueux, Aymeric Spiga, Timothy N. Titus, 6th international conference on Mars polar science and exploration: Conference summary and five top questions, In Icarus, 2017, , ISSN 0019-1035, https://doi.org/10.1016/j.icarus.2017.06.027.

Publication Thumbnail
Year Published: 2018

Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in the Grand Canyon

Sandbars are iconic features of the Colorado River in the Grand Canyon, Arizona, U.S.A. Following completion of Glen Canyon Dam in 1963, sediment deficit conditions caused erosion of eddy sandbars throughout much of the 360 km study reach downstream from the dam. Controlled floods in 1996, 2004, and 2008 demonstrated that sand on the channel...

Mueller, Erich R.; Grams, Paul E.; Hazel, Joseph E.; Schmidt, John C.
Mueller, E.R., Grams, P.E., Hazel Jr., J.E., and Schmidt, J.C., 2017, in press, Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in Grand Canyon: Sedimentary Geology, v. (online), https://doi.org/10.1016/j.sedgeo.2017.11.007.

Publication Thumbnail
Year Published: 2018

Estimating disperser abundance using open population models that incorporate data from continuous detection PIT arrays

Autonomous passive integrated transponder (PIT) tag antenna systems continuously detect individually marked organisms at one or more fixed points over long time periods. Estimating abundance using data from autonomous antennae can be challenging, because these systems do not detect unmarked individuals. Here we pair PIT antennae data from a...

Dzul, Maria C.; Yackulic, Charles B.; Korman, Josh
Dzul, M.C., Yackulic, C.B., and Korman, J., 2017, Estimating disperser abundance using open population models that incorporate data from continuous detection PIT arrays: Canadian Journal of Fisheries and Aquatic Sciences, v. (online), https://doi.org/10.1139/cjfas-2017-0304.

Publication Thumbnail
Year Published: 2018

Riparian bird density decline in response to biocontrol of Tamarix from riparian ecosystems along the Dolores River in SW Colorado, USA

Biocontrol of invasive tamarisk (Tamarix spp.) in the arid Southwest using the introduced tamarisk beetle (Diorhabda elongata) has been hypothesized to negatively affect some breeding bird species, but no studies to date have documented the effects of beetle-induced defoliation on riparian bird abundance. We assessed the effects of tamarisk...

Darrah, Abigail J.; van Riper, Charles
Darrah, A.J., and van Riper III, C., 2017, Riparian bird density decline in response to biocontrol of Tamarix from riparian ecosystems along the Dolores River in SW Colorado, USA: Biological Invasions, v. (online), https://doi.org/10.1007/s10530-017-1569-z.

Publication Thumbnail
Year Published: 2018

Landscape-scale processes influence riparian plant composition along a regulated river

Hierarchical frameworks are useful constructs when exploring landscape- and local-scale factors affecting patterns of vegetation in riparian areas. In drylands, which have steep environmental gradients and high habitat heterogeneity, landscape-scale variables, such as climate, can change rapidly along a river's course, affecting the relative...

Palmquist, Emily C.; Ralston, Barbara; Merritt, David M.; Shafroth, Patrick B.
Palmquist, E.C., Ralston, B.E., Merritt, D.M., and Shafroth, P.B., 2017, in press, Landscape-scale processes influence riparian plant composition along a regulated river: Journal of Arid Environments, v. (online), https://doi.org/10.1016/j.jaridenv.2017.10.001.

Publication Thumbnail
Year Published: 2018

The effects of snow and salt on ice table stability in University Valley, Antarctica

The Antarctic Dry Valleys represent a unique environment where it is possible to study dry permafrost overlaying an ice-rich permafrost. In this paper, two opposing mechanisms for ice table stability in University Valley are addressed: i) diffusive recharge via thin seasonal snow deposits and ii) desiccation via salt deposits in the upper soil...

Williams, Kaj; Heldmann, Jennifer L.; McKay, Christopher P.; Mellon, Michael T.
Williams, K., Heldmann, J., Mckay, C., & Mellon, M. (2017). The effects of snow and salt on ice table stability in University Valley, Antarctica. Antarctic Science, 1-12. doi:10.1017/S0954102017000402

Publication Thumbnail
Year Published: 2018

Maximizing establishment and survivorship of field-collected and greenhouse-cultivated biocrusts in a semi-cold desert

AimsBiological soil crusts (biocrusts) are soil-surface communities in drylands, dominated by cyanobacteria, mosses, and lichens. They provide key ecosystem functions by increasing soil stability and influencing soil hydrologic, nutrient, and carbon cycles. Because of this, methods to reestablish biocrusts in damaged drylands are needed. Here we...

Antoninka, Anita; Bowker, Matthew A.; Chuckran, Peter; Barger, Nicole N.; Reed, Sasha C.; Belnap, Jayne
Antoninka, A., Bowker, M.A., Chuckran, P., Barger, N.N., Reed, S., and Belnap, J., 2017, Maximizing establishment and survivorship of field-collected and greenhouse-cultivated biocrusts in a semi-cold desert: Plant and Soil, v. (online), http://dx.doi.org/10.1007/s11104-017-3300-3.

Publication Thumbnail
Year Published: 2018

Long-term trends in restoration and associated land treatments in the southwestern United States

Restoration treatments, such as revegetation with seeding or invasive species removal, have been applied on U.S. public lands for decades. Temporal trends in these management actions have not been extensively summarized previously, particularly in the southwestern United States where invasive plant species, drought, and fire have altered dryland...

Copeland, Stella M.; Munson, Seth M.; Pilliod, David S.; Welty, Justin L.; Bradford, John B.; Butterfield, Bradley J.
Copeland, S.M., Munson, S.M., Pilliod, D.S., Welty, J.L., Bradford, J.B., and Butterfield, B.J., 2017, Long-term trends in restoration and associated land treatments in the southwestern United States: Restoration Ecology, v. (online), http://dx.doi.org/10.1111/rec.12574.

Publication Thumbnail
Year Published: 2018

Climate variability and vadose zone controls on damping of transient recharge

Increasing demand on groundwater resources motivates understanding of the controls on recharge dynamics so model predictions under current and future climate may improve. Here we address questions about the nonlinear behavior of flux variability in the vadose zone that may explain previously reported teleconnections between global-scale climate...

Corona, Claudia R.; Gurdak, Jason J.; Dickinson, Jesse E.; Ferré, T.P.A.; Maurer, Edwin P.

Publication Thumbnail
Year Published: 2018

Northern tamarisk beetle (Diorhabda carinulata) and tamarisk (Tamarix spp.) interactions in the Colorado River basin

Northern tamarisk beetles (Diorhabda carinulata) were released in the Upper Colorado River Basin in the United States in 2004–2007 to defoliate introduced tamarisk shrubs (Tamarix spp.) in the region’s riparian zones. The primary purpose was to control the invasive shrub and reduce evapotranspiration (ET) by tamarisk in an attempt to increase...

Nagler, Pamela L.; Nguyen, Uyen; Bateman, Heather L.; Jarchow, Christopher; Glenn, Edward P.; Waugh, William J.; van Riper, Charles
Nagler, Pamela L., Uyen Nguyen, Heather L. Bateman, Christopher J. Jarchow, Edward P. Glenn, William J. Waugh, Charles van Riper III. 2017. Northern tamarisk beetle (Diorhabda carinulata) and tamarisk (Tamarix spp.) interactions in the Colorado River basin. Restoration Ecology. DOI: 10.1111/rec.12575

Filter Total Items: 239
Image: Black Skimmer Nesting Colony
July 12, 2009

Black Skimmer Nesting Colony

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer Nesting Colony
July 12, 2009

Black Skimmer Nesting Colony

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
July 12, 2009

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White-faced Ibis
July 2, 2009

White-faced Ibis

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet Attack
June 11, 2009

American Avocet Attack

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: California Brown Pelicans
June 11, 2009

California Brown Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: California Brown Pelicans
June 11, 2009

California Brown Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: California Brown Pelicans
June 11, 2009

California Brown Pelicans

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: An American Avocet and Black Skimmer
June 11, 2009

An American Avocet and Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Gull-billed Tern
June 11, 2009

Gull-billed Tern

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Gull-billed Tern
June 11, 2009

Gull-billed Tern

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Snowy Egret, Great Blue Heron and Brown Pelican
June 11, 2009

Snowy Egret, Great Blue Heron and Brown Pelican at the Salton Sea

Birds found in and around the Salton Sea, California.

Attribution: Southwest

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