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Filter Total Items: 2,184
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Year Published: 2017

Sand pulses and sand patches on the Colorado River in Grand Canyon

Alluvial sandbars occur in lateral recirculation zones (eddies) along the Colorado River in Grand Canyon National Park (Schmidt, 1990). Resource managers periodically release controlled floods from the upstream Glen Canyon Dam to rebuild these bars (Grams et al., 2015), which erode during fluctuating dam releases, and by hillslope runoff and wind...

Grams, Paul E.; Buscombe, Daniel; Topping, David; Mueller, Erich R.
Grams P.E., Buscombe D., Topping D.J. and Mueller E.R., 2017, Sand Pulses and Sand Patches on the Colorado River in Grand Canyon—extended abstract in Lanzoni, S., Redolfi, M., and Zolezzi, G., eds., RCEM 2017 – Back to Italy—The 10th Symposium on River, Coastal and Estuarine Morphodynamics: Trento-Padova, Italy, September 15-22, 2017, p. 183, http://events.unitn.it/sites/events.unitn.it/files/download/rcem17/rcem-bookofabstract-ebook_0.pdf.

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Year Published: 2017

Spatial data analytics on heterogeneous multi- and many-core parallel architectures using python

Parallel vector spatial analysis concerns the application of parallel computational methods to facilitate vector-based spatial analysis. The history of parallel computation in spatial analysis is reviewed, and this work is placed into the broader context of high-performance computing (HPC) and parallelization research. The rise of cyber...

Laura, Jason R.; Rey, Sergio J.
Laura, Jason, and Rey, Sergio J., 2016, Spatial Data Analytics on Heterogeneous Multi- and Many-Core Parallel Architectures Using Python, in Shekhar, S., et al., eds.: Encyclopedia of GIS, Springer, 10 p., doi:10.1007/978-3-319-23519-6_1569-1.

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Year Published: 2017

The sand dunes of the Colorado River, Grand Canyon, USA

The flow (Wright and Kaplinski, 2011), suspended sediment transport (Topping et al., 2000), sediment storage (Grams et al., 2013), and sedimentology of sandbars (Rubin et al., 1998) of the 250 miles of the Colorado River that run through Grand Canyon National Park have been well studied and described. However, there has been little systematic or...

Buscombe, Daniel; Kaplinski, Matthew; Grams, Paul E.; Ashley, Thomas; McElroy, Brandon; Rubin, David M.
Buscombe D., Kaplinski M., Grams P.E., Ashley T., McElroy B.J. and Rubin D.M. , 2017, The sand dunes of the Colorado River, Grand Canyon, USA—extended abstract in Lanzoni, S., Redolfi, M., and Zolezzi, G., eds., RCEM 2017 – Back to Italy—The 10th Symposium on River, Coastal and Estuarine Morphodynamics: Trento-Padova, Italy, September 15-22, 2017, p. 161, http://events.unitn.it/sites/events.unitn.it/files/download/rcem17/rcem-bookofabstract-ebook_0.pdf.

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Year Published: 2017

Turtles: Freshwater

With their iconic shells, turtles are morphologically distinct in being the only extant or extinct vertebrate animals to have their shoulders and hips inside their rib cages. By the time an asteroid hit the earth 65.5 million years ago, causing the extinction of dinosaurs, turtles were already an ancient lineage that was 70% through their...

Gibbons, J. Whitfield; Lovich, Jeffrey E.; Bowden, R.M.
Gibbons, J.W., Lovich, J., and Bowden, R.M., 2017, Turtles--Freshwater, in Encyclopedia of animal behavior--Reference module in Life Sciences: Amsterdam, The Netherlands, Elsevier, p. 462-468, http://www.sciencedirect.com/science/article/pii/B9780128096338012188.

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Year Published: 2017

Hatching success and predation of Bog Turtle (Glyptemys muhlenbergii) eggs in New Jersey and Pennsylvania

Nest-site selection by most turtles affects the survival of females and their offspring. Although bog turtles (Glyptemys muhlenbergii) do not typically leave their wetlands for nesting, nest-site selection can impact hatching success and hatchling survival. Between 1974 and 2012, we monitored the fates of 258 bog turtle eggs incubated in the field...

Zappalorti, Robert T.; Tutterow, Annalee M.; Pittman, Shannon E.; Lovich, Jeffrey E.
Zappalorti, R.T., Tutterow, A.L., Pittman, S.E., and Lovich, J.E., 2017, in press, Hatching success and predation of bog turtle (Glyptemys muhlenbergii) eggs in New Jersey and Pennsylvania: Chelonian Conservation and Biology, v. (online), https://doi.org/10.2744/CCB-1237.1.

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Year Published: 2017

The Colour and Stereo Surface Imaging System (CaSSIS) for the ExoMars Trace Gas Orbiter

The Colour and Stereo Surface Imaging System (CaSSIS) is the main imaging system onboard the European Space Agency’s ExoMars Trace Gas Orbiter (TGO) which was launched on 14 March 2016. CaSSIS is intended to acquire moderately high resolution (4.6 m/pixel) targeted images of Mars at a rate of 10–20 images per day from a roughly circular orbit 400...

Thomas, N.; Cremonese, G.; Ziethe, R.; Gerber, M.; Brändli, M.; Bruno, G.; Erismann, M.; Gambicorti, L.; Gerber, T.; Ghose, K.; Gruber, M.; Gubler, P.; Mischler, H.; Jost, J.; Piazza, D.; Pommerol, A.; Rieder, M.; Roloff, V.; Servonet, A.; Trottmann, W.; Uthaicharoenpong, T.; Zimmermann, C.; Vernani, D.; Johnson, M.; Pelò, E.; Weigel, T.; Viertl, J.; De Roux, N.; Lochmatter, P.; Sutter, G.; Casciello, A.; Hausner, T.; Ficai Veltroni, I.; Da Deppo, V.; Orleanski, P.; Nowosielski, W.; Zawistowski, T.; Szalai, S.; Sodor, B.; Tulyakov, S.; Troznai, G.; Banaskiewicz, M.; Bridges, J.C.; Byrne, S.; Debei, S.; El-Maarry, M. R.; Hauber, E.; Hansen, C.J.; Ivanov, A.; Keszthelyil, L.; Kirk, Randolph L.; Kuzmin, R.; Mangold, N.; Marinangeli, L.; Markiewicz, W. J.; Massironi, M.; McEwen, A.S.; Okubo, Chris H.; Tornabene, L.L.; Wajer, P.; Wray, J.J.
Thomas, N., Cremonese, G., Ziethe, R., Gerber, M., Brändli, M., Bruno, G., … Wray, J. J. (2017). The Colour and Stereo Surface Imaging System (CaSSIS) for the ExoMars Trace Gas Orbiter. Space Science Reviews, 212(3–4), 1897–1944. https://doi.org/10.1007/s11214-017-0421-1

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Year Published: 2017

Future soil moisture and temperature extremes imply expanding suitability for rainfed agriculture in temperate drylands

The distribution of rainfed agriculture is expected to respond to climate change and human population growth. However, conditions that support rainfed agriculture are driven by interactions among climate, including climate extremes, and soil moisture availability that have not been well defined. In the temperate regions that support much of the...

Bradford, John B.; Schlaepfer, Daniel R.; Lauenroth, William K.; Yackulic, Charles B.; Duniway, Michael C.; Hall, Sonia A.; Jia, Gensuo; Jamiyansharav, Khishigbayar; Munson, Seth M.; Wilson, Scott D.; Tietjen, Britta
Bradford, J.B., Schlaepfer, D.R., Lauenroth, W.K., Yackulic, C.B., Duniway, M., Hall, S., Jia, G., Jamiyansharav, K., Munson, S.M., Wilson, S.D., and Tietjen, B., 2017, Future soil moisture and temperature extremes imply expanding suitability for rainfed agriculture in temperate drylands: Scientific Reports, v. (online), http://dx.doi.org/10.1038/s41598-017-13165-x.

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Year Published: 2017

Monitoring gas and heat emissions at Norris Geyser Basin, Yellowstone National Park, USA based on a combined eddy covariance and Multi-GAS approach

We quantified gas and heat emissions in an acid-sulfate, vapor-dominated area (0.04-km2) of Norris Geyser Basin, located just north of the 0.63 Ma Yellowstone Caldera and near an area of anomalous uplift. From 14 May to 3 October 2016, an eddy covariance system measured half-hourly CO2, H2O and sensible (H) and latent (LE) heat fluxes and a...

Lewicki, Jennifer L.; Kelly, Peter J.; Bergfeld, Deborah; Vaughan, R. Greg; Lowenstern, Jacob B.
Lewicki, J.L., P.J. Kelly, D. Bergfeld, R.G. Vaughan, J.B. Lowenstern. Monitoring gas and heat emissions at Norris Geyser Basin, Yellowstone National Park, USA based on a combined eddy covariance and Multi-GAS approach. Journal of Volcanology and Geothermal Research, 347, 312-326, https://doi.org/10.1016/j.jvolgeores.2017.10.001, 2017.

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Year Published: 2017

Variation in annual clutch phenology of desert tortoises (Gopherus morafkai) in the Sonoran Desert of Arizona

The phenology of egg production and oviposition in organisms affects survival and development of neonates and thus, both offspring and maternal fitness. In addition, in organisms with environmental sex determination, clutch phenology can affect hatchling sex ratios with attendant effects on population demography. The rapid rate of contemporary...

Lovich, Jeffrey E.; Averill-Murray, Roy C.; Agha, Mickey; Ennen, Joshua R.; Austin, Meaghan
Lovich, J.E., Averill-Murray, R.C., Agha, M., Ennen, J.R., and Austin, M., 2017, in press, Variation in Annual Clutch Phenology of Sonoran Desert Tortoises (Gopherus morafkai) in Central Arizona: Herpetologica, v. (online), http://dx.doi.org/10.1655/HERPETOLOGICA-D-17-00007.1.

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Year Published: 2017

Biocrust ecology: Unifying micro- and macro-scales to confront global change

Biological soil crusts (biocrusts) are communities of microbes, lichens and bryophytes living at the soil surface in drylands (Fig. 1; Belnap et al., 2016). Biocrusts occur on all continents and can comprise a majority of cover in some systems (Belnap et al., 2016). While species diversity and distributions have long been a research focus,...

Ferrenberg, Scott; Reed, Sasha C.
Ferrenberg, S., and Reed, S.C., 2017, Biocrust ecology: unifying micro- and macro-scales to confront global change: New Phytologist, v. 216, no. 3, p. 643-646, http://dx.doi.org/10.1111/nph.14826.

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Year Published: 2017

Origin of discrepancies between crater size-frequency distributions of coeval lunar geologic units via target property contrasts

Recent work on dating Copernican-aged craters, using Lunar Reconnaissance Orbiter (LRO) Camera data, re-encountered a curious discrepancy in crater size-frequency distribution (CSFD) measurements that was observed, but not understood, during the Apollo era. For example, at Tycho, Copernicus, and Aristarchus craters, CSFDs of impact melt deposits...

Van der Bogert, Carolyn H.; Hiesinger, Harald; Dundas, Colin M.; Kruger, T.; McEwen, Alfred S.; Zanetti, Michael; Robinson, Mark S.
Van der Bogert, C. H., Hiesinger, H., Dundas, C. M., Kruger, T., Zanetti, M., McEwen, A. S., Robinson, M. S., 2017. Origins of discrepancies between crater size-frequency distributions of coeval lunar geologic units. Icarus, 298, 49-63, doi:10.1016/j.icarus.2016.11.040.

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Year Published: 2017

A coupled metabolic-hydraulic model and calibration scheme for estimating of whole-river metabolism during dynamic flow conditions

Conventional methods for estimating whole-stream metabolic rates from measured dissolved oxygen dynamics do not account for the variation in solute transport times created by dynamic flow conditions. Changes in flow at hourly time scales are common downstream of hydroelectric dams (i.e. hydropeaking), and hydrologic limitations of conventional...

Payn, Robert A.; Hall, Robert O Jr.; Kennedy, Theodore A.; Poole, Geoff C; Marshall, Lucy A.
Payn, R.A., Hall Jr., R.O., Kennedy, T.A., Poole, G.C., and Marshall, L.A., 2017, A coupled metabolic-hydraulic model and calibration scheme for estimating of whole-river metabolism during dynamic flow conditions: Limnology and Oceanography: Methods, v. (online), http://dx.doi.org/10.1002/lom3.10204.

Filter Total Items: 239
Image: Dowitcher Feeding
July 18, 2008

Dowitcher Feeding

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Salton Sea Birds
July 18, 2008

Salton Sea Birds

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet
July 18, 2008

American Avocet

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: White-faced Ibis and Egrets
June 28, 2008

White-faced Ibis and Egrets

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image:  Black Skimmer and Gull-billed Tern Nesting Colony
June 20, 2008

Black Skimmer and Gull-billed Tern Nesting Colony

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Gull-billed Tern
June 20, 2008

Gull-billed Tern

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
June 20, 2008

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image:  Black Skimmer and Gull-billed Tern Nesting Colony
May 21, 2008

Black Skimmer and Gull-billed Tern Nesting Colony

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet Feeding
April 29, 2008

American Avocet Feeding

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Egret
April 16, 2008

Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Egret
April 16, 2008

Egret

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Least Sandpiper
April 16, 2008

Least Sandpiper

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.