Regions

Southwest

Regions L2 Landing Page Tabs

Filter Total Items: 2,176
Publication Thumbnail
Year Published: 2017

Evapotranspiration by remote sensing: An analysis of the Colorado River Delta before and after the Minute 319 pulse flow to Mexico

The unique hydrologic conditions characterizing riparian ecosystems in dryland (arid and semi-arid) areas help maintain high biodiversity and support high levels of primary productivity compared to associated uplands. In western North America, many riparian ecosystems have been damaged by altered flow regimes (e.g., impoundments and diversions)...

Jarchow, Christopher J.; Nagler, Pamela L.; Glenn, Edward P.; Ramirez-Hernandez, Jorge; Rodriguez-Burgueno, Eliana
Christopher J. Jarchow, Pamela L. Nagler, Edward P. Glenn, Jorge Ramírez-Hernandez, Eliana Rodríguez-Burgueño, Evapotranspiration by remote sensing: An analysis of the Colorado River Delta before and after the Minute 319 pulse flow to Mexico, Ecological Engineering, 2016, http://dx.doi.org/10.1016/j.ecoleng.2016.10.056.

Publication Thumbnail
Year Published: 2017

Greenup and evapotranspiration following the Minute 319 pulse flow to Mexico: An analysis using Landsat 8 Normalized Difference Vegetation Index (NDVI) data

In the southwestern U.S., many riparian ecosystems have been altered by dams, water diversions, and other anthropogenic activities. This is particularly true of the Colorado River, where numerous dams and agricultural diversions have affected this water course, especially south of the U.S.–Mexico border. In the spring of 2014, 130 million cubic...

Jarchow, Christopher J.; Nagler, Pamela L.; Glenn, Edward P.
Christopher J. Jarchow, Pamela L. Nagler, Edward P. Glenn, Greenup and evapotranspiration following the Minute 319 pulse flow to Mexico: An analysis using Landsat 8 Normalized Difference Vegetation Index (NDVI) data, Ecological Engineering, 2016, ISSN 0925-8574, http://dx.doi.org/10.1016/j.ecoleng.2016.08.007.

Publication Thumbnail
Year Published: 2017

Competition amplifies drought stress in forests across broad climatic and compositional gradients

Forests around the world are experiencing increasingly severe droughts and elevated competitive intensity due to increased tree density. However, the influence of interactions between drought and competition on forest growth remains poorly understood. Using a unique dataset of stand-scale dendrochronology sampled from 6405 trees, we quantified how...

Gleason, Kelly; Bradford, John B.; Bottero, Alessandra; D'Amato, Tony; Fraver, Shawn; Palik, Brian J.; Battaglia, Michael; Iverson, Louis R.; Kenefic, Laura; Kern, Christel C.
Gleason, K.E., Bradford, J.B., Bottero, A., D’Amato, A.W., Fraver, S., Palik, B.J., Battaglia, M.A., Iverson, L., Kenefic, L., and Kern, C.C., 2017, Competition amplifies drought stress in forests across broad climatic and compositional gradients: Ecosphere, v. 8, no. 7, http://dx.doi.org/10.1002/ecs2.1849.

Publication Thumbnail
Year Published: 2017

It takes more than water: Restoring the Colorado River Delta

Environmental flows have become important tools for restoring rivers and associated riparian ecosystems (Arthington, 2012; Glenn et al., 2017). In March 2014, the United States and Mexico initiated a bold effort in restoration, delivering from Morelos Dam a “pulse flow” of water into the Colorado River in its delta for the purpose of learning...

Pitt, Jennifer; Kendy, Eloise; Schlatter, Karen; Hinojosa-Huertaf, Osvel; Flessa, Karl W.; Shafroth, Patrick B.; Ramirez-Hernandez, Jorge; Nagler, Pamela L.; Glenn, Edward P.
ennifer Pitt, Eloise Kendy, Karen Schlatter, Osvel Hinojosa-Huerta, Karl Flessa, Patrick B. Shafroth, Jorge Ramirez-Hernandez, Pamela Nagler, Edward P. Glenn, It takes more than water: Restoring the Colorado River Delta, Ecological Engineering, Available online 3 June 2017, ISSN 0925-8574, https://doi.org/10.1016/j.ecoleng.2017.05.028.

Publication Thumbnail
Year Published: 2017

Spatial variation in edaphic characteristics is a stronger control than nitrogen inputs in regulating soil microbial effects on a desert grass

Increased atmospheric nitrogen (N) deposition can have wide-ranging effects on plant community structure and ecosystem function, some of which may be indirectly mediated by soil microbial responses to an altered biogeochemical environment. In this study, soils from a field N fertilization experiment that spanned a soil texture gradient were used...

Chung, Y. Anny; Sinsabaugh, Robert L; Kuske, Cheryl R.; Reed, Sasha C.; Rudgers, Jennifer A.
Y. Anny Chung, Robert L. Sinsabaugh, Cheryl R. Kuske, Sasha C. Reed, Jennifer A. Rudgers, Spatial variation in edaphic characteristics is a stronger control than nitrogen inputs in regulating soil microbial effects on a desert grass, Journal of Arid Environments, Volume 142, July 2017, Pages 59-65

Publication Thumbnail
Year Published: 2017

Topographic, edaphic, and vegetative controls on plant-available water

Soil moisture varies within landscapes in response to vegetative, physiographic, and climatic drivers, which makes quantifying soil moisture over time and space difficult. Nevertheless, understanding soil moisture dynamics for different ecosystems is critical, as the amount of water in a soil determines a myriad ecosystem services and processes...

Dymond, Salli F.; Bradford, John B.; Bolstad, Paul V.; Kolka, Randall K.; Sebestyen, Stephen D.; DeSutter, Thomas S.
Dymond, S.F., Bradford, J.B., Bolstad, P.V., Kolka, R.K., Sebestyen, S.D., and DeSutter, T.M., 2017, Topographic, Edaphic, and Vegetative Controls on Plant-available Water: Ecohydrology, v. (online), http://dx.doi.org/10.1002/eco.1897.

Publication Thumbnail
Year Published: 2017

Climate and soil texture influence patterns of forb species richness and composition in big sagebrush plant communities across their spatial extent in the western US

Article for outlet: Plant Ecology. Abstract: Big sagebrush (Artemisia tridentata Nutt.) plant communities are widespread non-forested drylands in western North American and similar to all shrub steppe ecosystems world-wide are composed of a shrub overstory layer and a forb and graminoid understory layer. Forbs account for the majority of plant...

Pennington, Victoria E.; Palmquist, Kyle A.; Bradford, John B.; Lauenroth, William K.
Pennington, V.E., Palmquist, K.A., Bradford, J.B., and Lauenroth, W.K., 2017, Climate and soil texture influence patterns of forb species richness and composition in big sagebrush plant communities across their spatial extent in the western US: Plant Ecology, v. (online), http://dx.doi.org/10.1007/s11258-017-0743-9.

Publication Thumbnail
Year Published: 2017

The U.S. Geological Survey Astrogeology Science Center

In 1960, Eugene Shoemaker and a small team of other scientists founded the field of astrogeology to develop tools and methods for astronauts studying the geology of the Moon and other planetary bodies. Subsequently, in 1962, the U.S. Geological Survey Branch of Astrogeology was established in Menlo Park, California. In 1963, the Branch moved to...

Kestay, Laszlo P.; Vaughan, R. Greg; Gaddis, Lisa R.; Herkenhoff, Kenneth E.; Hagerty, Justin J.

Publication Thumbnail
Year Published: 2017

Ecohydrological role of biological soil crusts across a gradient in levels of development

Though biological soil crusts (biocrusts) form abundant covers in arid and semiarid regions, their competing effects on soil hydrologic conditions are rarely accounted for in models. This study presents the modification of a soil water balance model to account for the presence of biocrusts at different levels of development (LOD) and their impact...

Whitney, Kristen M.; Vivoni, Enrique R.; Duniway, Michael C.; Bradford, John B.; Reed, Sasha C.; Belnap, Jayne
Whitney, K. M., Vivoni, E. R., Duniway, M. C., Bradford, J. B., Reed, S. C., and Belnap, J. (2017) Ecohydrological Role of Biological Soil Crusts Across a Gradient in Levels of Development. Ecohydrol., doi: 10.1002/eco.1875.

Publication Thumbnail
Year Published: 2017

Does bioelectrical impedance analysis accurately estimate the condition of threatened and endangered desert fish species?

Bioelectrical impedance analysis (BIA) is a nonlethal tool with which to estimate the physiological condition of animals that has potential value in research on endangered species. However, the effectiveness of BIA varies by species, the methodology continues to be refined, and incidental mortality rates are unknown. Under laboratory conditions we...

Dibble, Kimberly L.; Yard, Micheal D.; Ward, David L.; Yackulic, Charles B.
Dibble, K.L., Yard, M.D., Ward, D.L., and Yackulic, C.B., 2017, Does Bioelectrical Impedance Analysis Accurately Estimate the Physiological Condition of Threatened and Endangered Desert Fish Species?: Transactions of the American Fisheries Society, v. 146, no. 5, p. 888-902, http://dx.doi.org/10.1080/00028487.2017.1302993.

Publication Thumbnail
Year Published: 2017

Geomorphology of comet 67P/Churyumov–Gerasimenko

We present a global geomorphological map of comet 67P/Churyumov–Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter’s OSIRIS Narrow Angle Camera. The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Imagery of the Southern hemisphere was included in our study...

Birch, Samuel P. D.; Tang, Y.; Hayes, A. G.; Kirk, Randolph L.; Bodewitz, D.; Campins, H.; Fernandez, Y.; de Freitas Bart, R.; Kutsop, N. W.; Sierks, H.; Soderblom, J. M.; Squyres, S. W.; Vincent, J.-B.
Birch, S.P.D., Tang, Y., Hayes, A.G., Kirk, R.L., Bodewits, D., Campins, H., Fernandez, Y., de Freitas, B.R., Kutsop, N.W., Sierks, H., Soderblom, J.M., Squyres, S.W., and Vincent, J-B., 2017, Geomorphology of comet 67P/Churyumov--Gerasimenko: Monthly Notices of the Royal Astronomical Society, p. S50-S67, https://doi.org/10.1093/mnras/stx1096.

Publication Thumbnail
Year Published: 2017

Monitoring water content dynamics of biological soil crusts

Biological soil crusts (hereafter, “biocrusts”) dominate soil surfaces in nearly all dryland environments. To better understand the influence of water content on carbon (C) exchange, we assessed the ability of dual-probe heat-pulse (DPHP) sensors, installed vertically and angled, to measure changes in near-surface water content. Four DPHP sensors...

Young, Michael H.; Fenstermaker, Lynn F.; Belnap, Jayne
Young, M.H., Fenstermaker, L.F., and Belnap, J., 2017, Monitoring water content dynamics of biological soil crusts: Journal of Arid Environments, v. 142, p. 41-49, http://dx.doi.org/10.1016/j.jaridenv.2017.03.004.

Filter Total Items: 239
Image: Wood Storks
July 24, 2007

Wood Storks

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Wood Storks
July 24, 2007

Wood Storks

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
July 17, 2007

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
July 17, 2007

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
July 10, 2007

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
July 10, 2007

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
July 10, 2007

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Drilling for mineral resources near Canyonlands National Park, Utah
May 31, 2007

Drilling for mineral resources near Canyonlands National Park, Utah

Drilling for mineral resources near Canyonlands National Park, Utah

Climate change combined with overlapping high-intensity land uses are likely to create conditions detrimental to the recreation economy, wildlife habitat, water availability and other resources in hyper-arid landscapes, or drylands, in the future, according to a paper published in Ecosphere

...
Image: Caspian Tern Diving
May 24, 2007

Caspian Tern Diving

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Caspian Tern Diving
May 24, 2007

Caspian Tern Diving

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Caspian Tern Hovering
May 24, 2007

Caspian Tern Hovering

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Caspian Tern
May 24, 2007

Caspian Tern

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.