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Filter Total Items: 2,184
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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.

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Year Published: 2017

UAV lidar and hyperspectral fusion for forest monitoring in the southwestern USA

Forest vegetation classification and structure measurements are fundamental steps for planning, monitoring, and evaluating large-scale forest changes including restoration treatments. High spatial and spectral resolution remote sensing data are critically needed to classify vegetation and measure their 3-dimensional (3D) canopy structure at the...

Sankey, Temuulen T.; Donager, Jonathon; McVay, Jason L.; Sankey, Joel B.
Sankey, T., Donager, J., McVay, J., and Sankey, J.B., 2017, UAV lidar and hyperspectral fusion for forest monitoring in the southwestern USA: Remote Sensing of Environment, v. 195, p. 30-43, https://doi.org/10.1016/j.rse.2017.04.007.

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Year Published: 2017

The evolution of different maternal investment strategies in two closely related desert vertebrates

We compared egg size phenotypes and tested several predictions from the optimal egg size (OES) and bet-hedging theories in two North American desert-dwelling sister tortoise taxa, Gopherus agassizii and G. morafkai, that inhabit different climate spaces: relatively unpredictable and more predictable climate spaces, respectively. Observed...

Ennen, Joshua R.; Lovich, Jeffrey E.; Averill-Murray, Roy C.; Yackulic, Charles B.; Agha, Mickey; Loughran, Caleb; Tennant, Laura A.; Sinervo, Barry
Ennen, J.R., Lovich, J.E., Averill-Murray, R.C., Yackulic, C.B., Agha, M., Loughran, C., Tennant, L., Sinervo, B., 2017, The Evolution of Different Maternal Investment Strategies in Two Closely Related Desert Vertebrates: Ecology and Evolution, vol. 7, no. 9, p. 3177-3189, http://dx.doi.org/10.1002/ece3.2838.

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Year Published: 2017

Unusual population attributes of invasive red-eared slider turtles (Trachemys scripta elegans) in Japan: do they have a performance advantage?

The slider turtle (Trachemys scripta Thunberg in Schoepff, 1792) is native to the USA and Mexico. Due to the popularity of their colorful hatchlings as pets, they have been exported worldwide and are now present on all continents, except Antarctica. Slider turtles are well-established in Japan and occupy aquatic habitats in urban and agricultural...

Taniguchi, Mari; Lovich, Jeffrey E.; Mine, Kanako; Ueno, Shintaro; Kamezaki, Naoki

Filter Total Items: 239
Image: Black Tern
May 2, 2007

Black Tern

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Salton Sea Sunset
October 1, 2006

Salton Sea Sunset

Sunset on the southeast side of the Salton Sea, CA.

Image: Wilson's Phalarope
August 15, 2006

Wilson's Phalarope

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Wilson's Phalarope
July 28, 2006

Wilson's Phalarope

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Western Sandpiper
July 28, 2006

Western Sandpiper

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Wood Stork
July 28, 2006

Wood Stork

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Wood Storks
July 28, 2006

Wood Storks

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Clarks Grebe
July 13, 2006

Clarks Grebe

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black-necked Stilt Chick
July 13, 2006

Black-necked Stilt Chick

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet on Her Eggs
July 11, 2006

American Avocet on Her Eggs

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet Nesting
July 11, 2006

American Avocet Nesting

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Salton Sea Birds
July 11, 2006

Salton Sea Birds

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.