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Filter Total Items: 2,153
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Year Published: 2018

Convergent validity between willingness to pay elicitation methods: An application to Grand Canyon whitewater boaters

We directly compare trip willingness to pay (WTP) values between dichotomous choice contingent valuation (DCCV) and discrete choice experiment (DCE) stated preference surveys of private party Grand Canyon whitewater boaters. The consistency of DCCV and DCE estimates is debated in the literature, and this study contributes to the body of work...

Neher, Christopher; Bair, Lucas S.; Duffield, John; Patterson, David A.; Neher, Katherine
Neher, C., Bair, L.S., Duffield, J., Patterson, D., and Neher, K., 2018, Exploring convergent validity between willingness to pay elicitation methods—An application to Grand Canyon whitewater boaters: Journal of Environmental Planning and Management, v. (online), https://doi.org/10.1080/09640568.2018.1435411.

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Year Published: 2018

Ancient Martian aeolian processes and palaeomorphology reconstructed from the Stimson formation on the lower slope of Aeolis Mons, Gale crater, Mars

Reconstruction of the palaeoenvironmental context of Martian sedimentary rocks is central to studies of ancient Martian habitability and regional palaeoclimate history. This paper reports the analysis of a distinct aeolian deposit preserved in Gale crater, Mars, and evaluates its palaeomorphology, the processes responsible for its deposition, and...

Banham, Steve G.; Gupta, Sanjeev; Rubin, David M.; Watkins, Jessica A.; Sumner, Dawn Y.; Edgett, Kenneth S.; Grotzinger, John P.; Lewis, Kevin W.; Edgar, Lauren A.; Stack, Kathryn M.; Barnes, Robert; Bell, Jame F. III; Day, Mackenzie D.; Ewing, Ryan C.; Lapotre, Mathieu G.A.; Stein, Nathan T.; Rivera-Hernández, Frances; Vasavada, Ashwin R.
Banham, S. G., Gupta, S., Rubin, D. M., Watkins, J. A., Sumner, D. Y., Edgett, K. S., Grotzinger, J. P., Lewis, K. W., Edgar, L. A., Stack-Morgan, K. M., Barnes, R., Bell, J. F., Day, M. D., Ewing, R. C., Lapotre, M. G.A., Stein, N. T., Rivera-Hernandez, F. and Vasavada, A. R. (2018), Ancient Martian aeolian processes and palaeomorphology reconstructed from the Stimson formation on the lower slope of Aeolis Mons, Gale crater, Mars. Sedimentology. https://doi.org/10.1111/sed.12469

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Year Published: 2018

Relaxed impact craters on Ganymede: Regional variation and high heat flows

Viscously relaxed craters provide a window into the thermal history of Ganymede, a satellite with copious geologic signs of past high heat flows. Here we present measurements of relaxed craters in four regions for which suitable imaging exists: near Anshar Sulcus, Tiamat Sulcus, northern Marius Regio, and Ganymede's south pole. We describe a...

Singer, Kelsi N.; Bland, Michael T.; Schenk, Paul M.; McKinnon, William B.
Sing, K. N., Bland, M. T., Schenk, P. M., McKinnon, W. B., 2018. Relaxed impact craters on Ganymede: Regional variation and high heat flows. Icarus 306, 214-224.

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Year Published: 2018

Identifying cost-effective invasive species control to enhance endangered species populations in the Grand Canyon, USA

Recovering endangered species populations when confronted with the threat of invasive species is an ongoing natural resource management challenge. While eradication of the invasive species is often the optimal economic solution, it may not be a feasible nor desirable management action in other cases. For example, when...

Bair, Lucas S.; Yackulic, Charles B.; Springborn, Michael R.; Reimer, Matthew N.; Bond, Craig A.; Coggins, Lewis G.
Bair, L.S., Yackulic, C.B., Springborn, M.R., Reimer, M.N., Bond, C.A., and Coggins, L.G., 2018, Identifying cost-effective invasive species control to enhance endangered species abundance in the Grand Canyon, USA: Biological Conservation, v. 220, p. 12-20, https://dx.doi.org/10.1016/j.biocon.2018.01.032.

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Year Published: 2018

Geologic map of the Nepenthes Planum Region, Mars

This map product contains a map sheet at 1:1,506,000 scale that shows the geology of the Nepenthes Planum region of Mars, which is located between the cratered highlands that dominate the southern hemisphere and the less-cratered sedimentary plains that dominate the northern hemisphere.  The map region contains cone- and mound-shaped...

Skinner, James A.; Tanaka, Kenneth L.
Skinner, J.A., Jr., and Tanaka, K.L., 2018, Geologic map of the Nepenthes Planum Region, Mars: U.S. Geological Survey Scientific Investigations Map 3389, pamphlet 11 p., scale 1:1,506,000, https://doi.org/10.3133/sim3389.

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Year Published: 2018

Inferring species interactions through joint mark–recapture analysis

Introduced species are frequently implicated in declines of native species. In many cases, however, evidence linking introduced species to native declines is weak. Failure to make strong inferences regarding the role of introduced species can hamper attempts to predict population viability and delay effective management responses. For many species...

Yackulic, Charles B.; Korman, Josh; Yard, Michael D.; Dzul, Maria C.
Yackulic, C.B., Korman, J., Yard, M.D., and Dzul, M.C., 2018, Inferring species interactions through joint mark-recapture analysis: Ecology, early view available at http://dx.doi.org/10.1002/ecy.2166.

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Year Published: 2018

Assessment of geochemical and hydrologic conditions near Old Yuma Mine in Saguaro National Park, Arizona, 2014–17

The Old Yuma Mine is an abandoned copper, lead, zinc, silver, and gold mine located within the boundaries of Saguaro National Park, Tucson Mountain District, Arizona. This study analyzed the geochemistry of sediments associated with the Old Yuma Mine and assessed hydrologic and geochemical conditions of groundwater to evaluate the area surrounding...

Beisner, Kimberly R.; Gray, Floyd
Beisner, K.R., and Gray, F., 2018, Assessment of geochemical and hydrologic conditions near Old Yuma Mine in Saguaro National Park, Arizona, 2014–17: U.S. Geological Survey Scientific Investigations Report 2018–5019, 52 p., https://doi.org/10.3133/sir20185019.

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Year Published: 2018

Collection methods and quality assessment for Escherichia coli, water quality, and microbial source tracking data within Tumacácori National Historical Park and the upper Santa Cruz River, Arizona, 2015-16

Tumacácori National Historical Park protects the culturally important Mission, San José de Tumacácori, while also managing a portion of the ecologically diverse riparian corridor of the Santa Cruz River. This report describes the methods and quality assurance procedures used in the collection of water samples for the analysis of Escherichia...

Paretti, Nicholas V.; Coes, Alissa L.; Kephart, Christopher M.; Mayo, Justine P.
Paretti, N.V., Coes, A.L., Kephart, C.M., and Mayo, J.P., 2018, Collection methods and quality assessment for Escherichia coli, water quality, and microbial source tracking data within Tumacácori National Historical Park and the upper Santa Cruz River, Arizona, 2015-16: U.S. Geological Survey, Scientific Investigations Report 2017–5139, 30 p., https://doi.org/10.3133/sir20175139.

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Year Published: 2018

A phylogenetic overview of the genus Vertigo O. F. Müller, 1773 (Gastropoda: Pulmonata: Pupillidae: Vertigininae)

We document global phylogenetic pattern in the pupillid land snail genus Vertigo by analyses of nDNA (ITS1 and ITS2) and mtDNA (CytB and 16S) sequence from 424 individuals representing 91 putative specific and subspecific Vertigo taxa. nDNA and mtDNA data were separately subjected to neighbor-joining, minimum evolution, maximum...

Nekola, Jeffrey C.; Chiba, Satoshi; Coles, Brian F.; Drost, Charles A.; von Proschwitz, Ted; Horsák, Michal
Nekola, J.C., Chiba, S., Coles, B.F., Drost, C.A., von Proschwitz, T., and Horsák, Michal, 2018, A phylogenetic overview of the genus Vertigo O.F. Müller, 1773 (Gastropoda: Pulmonata: Pupillidae: Vertiginininae): Malacologia, v. 62, no. 1, p. 21-161, https://doi.org/10.4002/040.062.0104.

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Year Published: 2018

Technical note: False low turbidity readings from optical probes during high suspended-sediment concentrations

Turbidity, a measure of water clarity, is monitored for a variety of purposes including (1) to help determine whether water is safe to drink, (2) to establish background conditions of lakes and rivers and detect pollution caused by construction projects and stormwater discharge, (3) to study sediment transport in rivers...

Voichick, Nicholas; Topping, David; Griffiths, Ronald
Voichick, N., Topping, D.J., and Griffiths, R.E., 2018, Technical note--False low turbidity readings during high suspended-sediment concentrations: Hydrology and Earth System Sciences, v. 22, p. 1767-1773, https://doi.org/10.5194/hess-22-1767-2018.

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Year Published: 2018

Automated remote cameras for monitoring alluvial sandbars on the Colorado River in Grand Canyon, Arizona

Automated camera systems deployed at 43 remote locations along the Colorado River corridor in Grand Canyon National Park, Arizona, are used to document sandbar erosion and deposition that are associated with the operations of Glen Canyon Dam. The camera systems, which can operate independently for a year or more, consist of a digital camera...

Grams, Paul E.; Tusso, Robert B.; Buscombe, Daniel
Grams, P.E., Tusso, R.B., and Buscombe, D., 2018, Automated remote cameras for monitoring alluvial sandbars on the Colorado River in Grand Canyon, Arizona: U.S. Geological Survey Open-File Report 2018–1019, 50 p., https://doi.org/10.3133/ofr20181019.

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Year Published: 2018

Pulsed flows, tributary inputs, and food web structure in a highly regulated river

1.Dams disrupt the river continuum, altering hydrology, biodiversity, and energy flow. Although research indicates that tributary inputs have the potential to dilute these effects, knowledge at the food web level is still scarce.2.Here we examined the riverine food web structure of the Colorado River below Glen Canyon Dam, focusing on organic...

Sabo, John; Caron, Melanie; Doucett, Richard R.; Dibble, Kimberly L.; Ruhi, Albert; Marks, Jane; Hungate, Bruce; Kennedy, Theodore A.
Sabo, J.L., Caron, M., Doucett, R., Dibble, K.L., Ruhi, A., Marks, J.C., Hungate, B.A., and Kennedy, T.A., 2018, in press, Pulsed flows, tributary inputs and food web structure in a highly regulated river: Journal of Applied Ecology, v. (online), http://onlinelibrary.wiley.com/doi/10.1111/1365-2664.13109/full.

Filter Total Items: 239
Bureau of Land Management truck sprays herbicide in southwestern Idaho as part of a restoration effort. 
December 31, 2012

Truck sprays herbicide in Idaho as part of a restoration effort.

Bureau of Land Management truck sprays herbicide in southwestern Idaho as part of a restoration effort. 

An examination of long-term data for lands managed by the Bureau of Land Management finds that land treatments in the southwestern United States are increasingly large, expensive and related to fire and invasive species control.

Mount Hood with Portland, Oregon in the foreground.
May 23, 2012

Mount Hood dominates the skyline outside of Portland, Oregon

A major eruption of Mount Hood would pose a great hazard to the regional economy.

Overhead view of coast with green land on right, blue water plus bands of white on left. Sand bars and other features labeled.
April 18, 2012

Ebb-tidal delta at Raglan Bar on New Zealand’s North Island

Seafloor features of the ebb-tidal delta at Raglan Bar on New Zealand’s North Island, as revealed in a composite “time-averaged” image made by averaging light intensities recorded at each pixel in each frame of two videos. The originally oblique image has been transformed into a map view (looking straight down from overhead). CMLB, channel margin linear bar (

...
A brown treesnake on frangipangi blossoms, by Bjorn Lardner, USGS.
January 1, 2011

A brown treesnake on frangipangi blossoms

A brown treesnake crawls on some frangipangi blossoms in Guam. 

Image: Black Skimmer
July 30, 2010

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmer
July 30, 2010

Black Skimmer

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet
July 30, 2010

American Avocet

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Black Skimmers
July 28, 2010

Black Skimmers

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Heron and Egret Nesting
July 28, 2010

Heron and Egret Nesting

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: American Avocet
July 18, 2010

American Avocet

Birds found in and around the Salton Sea, California.

Attribution: Southwest
Image: Dry Docks Morton Bay
July 18, 2010

Dry Docks Morton Bay

Dry Docks found in and around the Salton Sea, California.

Attribution: Southwest
Image: Dry Docks Morton Bay
July 18, 2010

Dry Docks Morton Bay

Dry Docks 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.