Validating growth and development of a seabird as an indicator of food availability: Captive-reared Caspian Tern chicks fed ad libitum and restricted diets
Donald E. Lyons, Daniel D. Roby
2011, Journal of Field Ornithology (82) 88-100
For seabirds raising young under conditions of limited food availability, reducing chick provisioning and chick growth rates are the primary means available to avoid abandonment of a breeding effort. For most seabirds, however, baseline data characterizing chick growth and development under known feeding conditions are unavailable, so it is difficult...
The secret to successful solute-transport modeling
Leonard F. Konikow
2011, Ground Water (49) 144-159
Modeling subsurface solute transport is difficult—more so than modeling heads and flows. The classical governing equation does not always adequately represent what we see at the field scale. In such cases, commonly used numerical models are solving the wrong equation. Also, the transport equation is hyperbolic where advection is dominant,...
Measurement of net nitrogen and phosphorus mineralization in wetland soils using a modification of the resin-core technique
Gregory B. Noe
2011, Biogeochemistry (75) 760-770
A modification of the resin-core method was developed and tested for measuring in situ soil N and P net mineralization rates in wetland soils where temporal variation in bidirectional vertical water movement and saturation can complicate measurement. The modified design includes three mixed-bed ion-exchange resin bags located above and three...
On the Hydrologic Adjustment of Climate-Model Projections: The Potential Pitfall of Potential Evapotranspiration
Paul C.D. Milly, Krista A. Dunne
2011, Earth Interactions (15) 1-14
Hydrologic models often are applied to adjust projections of hydroclimatic change that come from climate models. Such adjustment includes climate-bias correction, spatial refinement ("downscaling"), and consideration of the roles of hydrologic processes that were neglected in the climate model. Described herein is a quantitative analysis of the effects of hydrologic...
Occurrence and fate of the herbicide glyphosate and its degradate aminomethylphosphonic acid in the atmosphere
Feng-Chih Chang, M.F. Simcik, P. D. Capel
2011, Environmental Toxicology and Chemistry (30) 548-555
This is the first report on the ambient levels of glyphosate, the most widely used herbicide in the United States, and its major degradation product, aminomethylphosphonic acid (AMPA), in air and rain. Concurrent, weekly integrated air particle and rain samples were collected during two growing seasons in agricultural areas in...
Anthropogenic disturbance and landscape patterns affect diversity patterns of aquatic benthic macroinvertebrates
K.O. Maloney, P. Munguia, R.M. Mitchell
2011, Journal of the North American Benthological Society (30) 284-295
Measures of species diversity are valuable tools for assessing ecosystem health. However, most assessments have addressed individual sites or regional taxon pools, with few comparisons of differences in assemblage composition within or among regions. We examined the effects of anthropogenic disturbance on local richness (α diversity) and species turnover (β...
In-situ gas hydrate hydrate saturation estimated from various well logs at the Mount Elbert Gas Hydrate Stratigraphic Test Well, Alaska North Slope
Myung W. Lee, Timothy S. Collett
2011, Marine and Petroleum Geology (28) 439-449
In 2006, the U.S. Geological Survey (USGS) completed detailed analysis and interpretation of available 2-D and 3-D seismic data and proposed a viable method for identifying sub-permafrost gas hydrate prospects within the gas hydrate stability zone in the Milne Point area of northern Alaska. To validate the predictions of...
Growth rate and age distribution of deep-sea black corals in the Gulf of Mexico
N.G. Prouty, E.B. Roark, N.A. Buster, Steve W. Ross
2011, Marine Ecology Progress Series (423) 101-115
Black corals (order Antipatharia) are important long-lived, habitat-forming, sessile, benthic suspension feeders that are found in all oceans and are usually found in water depths greater than 30 m. Deep-water black corals are some of the slowest-growing, longest-lived deep-sea corals known. Previous age dating of a limited number of black...
Effects of a low severity prescribed fire on water-soluble elements in ash from a cork oak (Quercus suber) forest located in the northeast of the Iberian Peninsula
P. Pereira, X. beda, Deborah A. Martin, J. Mataix-Solera, C. Guerrero
2011, Environmental Research (111) 237-247
Wildfire is the major disturbance in Mediterranean forests. Prescribed fire can be an alternative to reduce the amount of fuel and hence decrease the wildfire risk. However the effects of prescribed fire must be studied, especially on ash properties, because ash is an important nutrient source for ecosystem recovery. The...
Molecular typing of Escherichia coli strains associated with threatened sea ducks and near-shore marine habitats of south-west Alaska
Tuula E. Hollmén, Chitrita DebRoy, Paul L. Flint, David E. Safine, Jason L. Schamber, Ann E. Riddle, Kimberly A. Trust
2011, Environmental Microbiology Reports (3) 262-269
In Alaska, sea ducks winter in coastal habitats at remote, non-industrialized areas, as well as in proximity to human communities and industrial activity. We evaluated prevalence and characteristics of Escherichia coli strains in faecal samples of Steller's eiders (Polysticta stelleri; n = 122) and harlequin ducks (Histrionicus histrionicus; n = 21) at an industrialized site and Steller's eiders...
Mineral resource of the month: potash
Stephen M. Jasinski
2011, Earth (56) 25-25
The article offers basic information about the mineral resource potash. According to the author, potash is the generic term for a variety of mined and manufactured salts that contain the mineral potassium in a water-soluble form. The author adds that potash is used in fertilizers, soaps and detergents, glass and...
The ShakeOut Scenario: Meeting the needs for construction aggregates, hot mix asphalt, and ready mix concrete
William H. Langer
2011, Earthquake Spectra (27) 505-520
An Mw 7.8 earthquake as described in the ShakeOut Scenario would cause significant damage to buildings and infrastructure. Over 6 million tons of newly mined aggregate would be used for emergency repairs and for reconstruction in the five years following the event. This aggregate would be applied mostly in the form...
Mountain-block recharge, present and past, in the eastern Espanola Basin, New Mexico, USA
Andrew H. Manning
2011, Hydrogeology Journal (19) 379-397
Noble gas recharge temperatures (NGTs) and radiocarbon ages were determined for 43 groundwater samples collected in the eastern Española Basin, New Mexico (USA), to identify mountain-block recharge in waters <10 thousand years (ka) old and to evaluate possible changes in mountain-block recharge over the past ∼35 ka. For Holocene samples from...
Active channel for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the active, wetted channel as...
Geomorphic floodplain with organic matter (biomass) estimates for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the geomorphic floodplain as derived...
Land cover classification for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the floodplain land cover as...
A Digital Hydrologic Network Supporting NAWQA MRB SPARROW Modeling--MRB_E2RF1WS
J. W. Brakebill, S.E. Terziotti
2011, Report
A digital hydrologic network was developed to support SPAtially Referenced Regression on Watershed attributes (SPARROW) models within selected regions of the United States. These regions correspond with the U.S. Geological Survey's National Water Quality Assessment (NAWQA) Program Major River Basin (MRB) study units 2, 3, 4, 5, and 7 (Preston...
Normalized Difference Vegetation Index for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the Normalized Difference Vegetation Index...
Solid sample locations for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the locations where solid samples...
Stream Centerline for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the stream centerline of the...
Water sample locations for Fanno Creek, Oregon
Steven Sobieszczyk
2011, Report
Fanno Creek is a tributary to the Tualatin River and flows though parts of the southwest Portland metropolitan area. The stream is heavily influenced by urban runoff and shows characteristic flashy streamflow and poor water quality commonly associated with urban streams. This data set represents the locations where water-quality samples...
GAGES-II: Geospatial Attributes of Gages for Evaluating Streamflow
James A. Falcone
2011, Report
This dataset, termed "GAGES II", an acronym for Geospatial Attributes of Gages for Evaluating Streamflow, version II, provides geospatial data and classifications for 9,322 stream gages maintained by the U.S. Geological Survey (USGS). It is an update to the original GAGES, which was published as a Data Paper on the...
A Digital Hydrologic Network Supporting NAWQA MRB SPARROW Modeling--MRB_E2RF1
J. W. Brakebill, S.E. Terziotti
2011, Report
A digital hydrologic network was developed to support SPAtially Referenced Regression on Watershed attributes (SPARROW) models within selected regions of the United States. These regions correspond with the U.S. Geological Survey's National Water Quality Assessment (NAWQA) Program Major River Basin (MRB) study units 2, 3, 4, 5, and 7 (Preston...
Estimation of mussel population response to hydrologic alteration in a southeastern U.S. stream
James T. Peterson, J.M. Wisniewski, C.P. Shea, Jackson C. Rhett
2011, Environmental Management (48) 109-122
The southeastern United States has experienced severe, recurrent drought, rapid human population growth, and increasing agricultural irrigation during recent decades, resulting in greater demand for the water resources. During the same time period, freshwater mussels (Unioniformes) in the region have experienced substantial population declines. Consequently, there is growing interest in...
Helicopter magnetic and electromagnetic surveys at Mounts Adams, Baker and Rainier, Washington: implications for debris flow hazards and volcano hydrology
Carol A. Finn, Maria Deszcz-Pan
2011, Conference Paper, International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Beijing, China, October 10-13, 2011
High‐resolution helicopter magnetic and electromagnetic (HEM) data flown over the rugged, ice‐covered Mt. Adams, Mt. Baker and Mt. Rainier volcanoes (Washington), reveal the distribution of alteration, water and ice thickness essential to evaluating volcanic landslide hazards. These data, combined with geological mapping and rock property measurements, indicate the presence of...
