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Filter Total Items: 2,153
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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

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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Year Published: 2017

Nitrogenase activity by biological soil crusts in cold sagebrush steppe ecosystems

In drylands worldwide, biological soil crusts (BSC) form a thin photosynthetic cover across landscapes, and provide vital benefits in terms of stabilizing soil and fixing nitrogen (N) and carbon (C). Numerous studies have examined the effects of climate and disturbance on BSC functions; however, few have characterized these responses in rolling...

Schwabedissen, Stacy G.; Lohse, Kathleen A.; Reed, Sasha C.; Aho, Ken A.; Magnuson, Timothy S.
Schwabedissen, S.G., Lohse, K.A., Reed, S.C., Aho, K.A., and Magnuson, T.S., 2017, Nitrogenase activity by biological soil crusts in cold sagebrush steppe ecosystems: Biogeochemistry, v. 134, no. 1-2, p. 56-76. http://dx.doi.org/10.1007/s10533-017-0342-9.

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Year Published: 2017

The U.S. Geological Survey Flagstaff Science Campus—Providing expertise on planetary science, ecology, water resources, geologic processes, and human interactions with the Earth

The U.S. Geological Survey’s Flagstaff Science Campus is focused on interdisciplinary study of the Earth and solar system, and has the scientific expertise to detect early environmental changes and provide strategies to minimize possible adverse effects on humanity. The Flagstaff Science Campus (FSC) is located in Flagstaff, Arizona, which is...

Hart, Robert J.; Vaughan, R. Greg; McDougall, Kristin; Wojtowicz, Todd; Thenkenbail, Prasad
Hart, R.J., Vaughan, R.G., McDougall, K., Wojtowicz, T., and Thenkenbail, P., 2017, The U.S. Geological Survey Flagstaff Science Campus—Providing expertise on planetary science, ecology, water resources, geologic processes, and human interactions with the Earth: U.S. Geological Survey Fact Sheet 2017–3051, 2 p., https://doi.org/10.3133/fs20173051.

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Year Published: 2017

Biological soil crusts: Diminutive communities of potential global importance

Biological soil crusts (biocrusts) are widespread, diverse communities of cyanobacteria, fungi, lichens, and mosses living on soil surfaces, primarily in drylands. Biocrusts can locally govern primary production, soil fertility, hydrology, and surface energy balance, with considerable variation in these functions across alternate community states...

Ferrenberg, Scott; Tucker, Colin; Reed, Sasha C.
Ferrenberg S., Tucker C.L., Reed S.C. Biological soil crusts: diminutive communities of potential global importance Front Ecol Environ 2017; 15(3): 160–167

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Year Published: 2017

Climate change may restrict dryland forest regeneration in the 21st century

The persistence and geographic expansion of dryland forests in the 21st century will be influenced by how climate change supports the demographic processes associated with tree regeneration. Yet, the way that climate change may alter regeneration is unclear. We developed a quantitative framework that estimates forest regeneration potential (RP) as...

Petrie, M.D.; Bradford, John B.; Hubbard, R.M.; Lauenroth, W.K.; Andrews, Caitlin M.; Schlaepfer, D.R.
Petrie, M.D., Bradford, J.B., Hubbard, R.M., Lauenroth, W.K., Andrews, C.M., Schlaepfer, D.R., 2017, Climate change may restrict dryland forest regeneration in the 21st century: Ecology, vol. 98, no. 6, p. 1548-1559, http://dx.doi.org/10.1002/ecy.1791/full.

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.