Reproductive strategies of northern geese: Why wait?
Craig R. Ely, K.S. Bollinger, R.V. Densmore, T.C. Rothe, M.J. Petrula, John Y. Takekawa, D.L. Orthmeyer
2007, The Auk (124) 594-605
Migration and reproductive strategies in waterbirds are tightly linked, with timing of arrival and onset of nesting having important consequences for reproductive success. Whether migratory waterbirds are capital or income breeders is predicated by their spring migration schedule, how long they are on breeding areas before nesting, and how adapted...
Persistence of pharmaceuticals and other organic compounds in chlorinated drinking water as a function of time
Jacob Gibs, Paul E. Stackelberg, Edward T. Furlong, Michael T. Meyer, Steven D. Zaugg, R.L. Lippincott
2007, Science of the Total Environment (373) 240-249
Ninety eight pharmaceuticals and other organic compounds (POOCs) that were amended to samples of chlorinated drinking-water were extracted and analyzed 1, 3, 6, 8, and 10 days after amendment to determine whether the total chlorine residual reacted with the amended POOCs in drinking water in a time frame similar to...
Migration of bats past a remote island offers clues toward the problem of bat fatalities at wind turbines
P.M. Cryan, A.C. Brown
2007, Biological Conservation (139) 1-11
Wind energy is rapidly becoming a viable source of alternative energy, but wind turbines are killing bats in many areas of North America. Most of the bats killed by turbines thus far have been migratory species that roost in trees throughout the year, and the highest fatality events appear to...
Influence of fluctuating water levels on mercury concentrations in adult walleye
T.M. Selch, C.W. Hoagstrom, E.J. Weimer, J.P. Duehr, S. R. Chipps
2007, Bulletin of Environmental Contamination and Toxicology (79) 36-40
[No abstract available]...
Formation of mixed Al-Fe colloidal sorbent and dissolved-colloidal partitioning of Cu and Zn in the Cement Creek - Animas River Confluence, Silverton, Colorado
Laurence E. Schemel, Briant A. Kimball, Robert L. Runkel, Marisa H. Cox
2007, Applied Geochemistry (22) 1467-1484
Transport and chemical transformations of dissolved and colloidal Al, Fe, Cu and Zn were studied by detailed sampling in the mixing zone downstream from the confluence of Cement Creek (pH 4.1) with the Animas River (pH 7.6). Complete mixing resulted in...
Steeply dipping heaving bedrock, Colorado: Part 1 - Heave features and physical geological framework
D.C. Noe, J.D. Higgins, H. W. Olsen
2007, Environmental & Engineering Geoscience (13) 289-308
Differentially heaving bedrock has caused severe damage near the Denver metropolitan area. This paper describes heave-feature morphologies, the underlying bedrock framework, and their inter-relationship. The heave features are linear to curvilinear and may attain heights of 0.7 m (2.4 ft), widths of 58 m (190 ft), and lengths of 1,067...
Application of a coupled ecosystem-chemical equilibrium model, DayCent-Chem, to stream and soil chemistry in a Rocky Mountain watershed
M.D. Hartman, Jill Baron, D.S. Ojima
2007, Ecological Modelling (200) 493-510
Atmospheric deposition of sulfur and nitrogen species have the potential to acidify terrestrial and aquatic ecosystems, but nitrate and ammonium are also critical nutrients for plant and microbial productivity. Both the ecological response and the hydrochemical response to atmospheric deposition are of interest to regulatory and land management agencies. We...
Effects of river discharge on abundance and instantaneous growth of age-0 carpsuckers in the Oconee River, Georgia, USA
Ronald C. Peterson, Cecil A. Jennings
2007, River Research and Applications (23) 1016-1025
The Oconee River in middle Georgia, U.S.A., has been regulated by the Sinclair Dam since 1953. Since then, the habitat of the lower Oconee River has been altered and the river has become more incised. The altered environmental conditions of the Oconee River may limit the success of various fish...
Forensic fingerprinting of oil-spill hydrocarbons in a methanogenic environment-Mandan, ND and Bemidji, MN
Frances D. Hostettler, Y. Wang, Y. Huang, W. Cao, Barbara A. Bekins, Colleen E. Rostad, C. F. Kulpa, Andrew E. Laursen
2007, Environmental Forensics (8) 139-153
In recent decades forensic fingerprinting of oil-spill hydrocarbons has emerged as an important tool for correlating oils and for evaluating their source and character. Two long-term hydrocarbon spills, an off-road diesel spill (Mandan, ND) and a crude oil spill (Bemidji, MN) experiencing methanogenic biodegradation were previously shown to be undergoing...
Insights into the use of time-lapse GPR data as observations for inverse multiphase flow simulations of DNAPL migration
R.H. Johnson, E. P. Poeter
2007, Journal of Contaminant Hydrology (89) 136-155
Perchloroethylene (PCE) saturations determined from GPR surveys were used as observations for inversion of multiphase flow simulations of a PCE injection experiment (Borden 9??m cell), allowing for the estimation of optimal bulk intrinsic permeability values. The resulting fit statistics and analysis of residuals (observed minus simulated PCE saturations) were used...
Mass dynamics of wintering Pacific Black Brant: Body, adipose tissue, organ, and muscle masses vary with location
D.D. Mason, P.S. Barboza, David H. Ward
2007, Canadian Journal of Zoology (85) 728-736
We compared body size and mass of the whole body, organs, adipose tissue, and muscles of adult Pacific Black Brant (Branta bernicla nigricans (Lawrence, 1846)) collected concurrently in Alaska and Baja California during the fall, winter, and spring of 2002–2003. Head and tarsal lengths of males were similar between sites...
Anthropogenic contaminants as tracers in an urbanizing karst aquifer
B. Mahler, N. Massei
2007, Journal of Contaminant Hydrology (91) 81-106
Karst aquifers are uniquely vulnerable to contamination. In the Barton Springs segment of the karstic Edwards aquifer (Texas, U.S.A.), urban contaminants such as pesticides and volatile organic compounds frequently are detected in spring base flow. To determine whether contaminant concentrations change in response to storms, and if they therefore might...
Influence of soil chemistry on metal and bioessential element concentrations in nymphal and adult periodical cicadas (Magicicada spp.)
G.R. Robinson Jr., P.L. Sibrell, C.J. Boughton, L.H. Yang
2007, Science of the Total Environment (374) 367-378
Metal and bioessential element concentrations were measured in three species of 17-year periodical cicadas (Magicicada spp.) to determine how cicada tissue chemistry is affected by soil chemistry, measure the bioavailability of metals from both uncontaminated and lead-arsenate-pesticide contaminated soils, and assess the potential risks of observed metal contamination for wildlife....
Recovery of three arctic stream reaches from experimental nutrient enrichment
J.P. Benstead, A.C. Green, Linda A. Deegan, B. J. Peterson, K. Slavik, W.B. Bowden, A.E. Hershey
2007, Freshwater Biology (52) 1077-1089
1. Nutrient enrichment and resulting eutrophication is a widespread anthropogenic influence on freshwater ecosystems, but recovery from nutrient enrichment is poorly understood, especially in stream environments. We examined multi-year patterns in community recovery from experimental low-concentration nutrient enrichment (N + P or P only) in three reaches of two Arctic...
Athabasca Valles, Mars: A lava-draped channel system
Windy L. Jaeger, Laszlo P. Keszthelyi, Alfred S. McEwen, Colin M. Dundas, Paul C. Russell
2007, Science (317) 1709-1711
Athabasca Valles is a young outflow channel system on Mars that may have been carved by catastrophic water floods. However, images acquired by the High-Resolution Imaging Science Experiment camera onboard the Mars Reconnaissance Orbiter spacecraft reveal that Athabasca Valles is now entirely draped by a thin layer of solidified lava...
Waterfowl distribution and abundance during spring migration in Southern Oregon and Northeastern California
J. P. Fleskes, J.L. Yee
2007, Western North American Naturalist (67) 409-428
We used aerial surveys to study abundance and distribution of waterfowl (ducks, geese, swans, and coots) during spring in southern Oregon and northeastern California (SONEC). Total waterfowl-use days in SONEC during the 119-day, 5 January-3 May, spring period was similar during 2002 (127,977,700) and 2003 (128,076,200) and averaged 1,075,900 birds...
Best management practices for nutrient and sediment retention in urban stormwater runoff
D.M. Hogan, M.R. Walbridge
2007, Journal of Environmental Quality (36) 386-395
Stormwater management infrastructure is utilized in urban areas to alleviate flooding caused by decreased landscape permeability from increased impervious surface cover (ISC) construction. In this study, we examined two types of stormwater detention basins, SDB-BMPs (stormwater detention basin-best management practice), and SDB-FCs (stormwater detention basin-flood control). Both are constructed to...
USGS National Wildlife Health Center's Quarterly Wildlife Mortality Report (United States)
M. Jankowski, K. Schuler, Rachel Guy
2007, Supplement to the Journal of Wildlife Diseases (43)
USGS National Wildlife Health Center's Quarterly Wildlife Mortality Report (North America)
M. Jankowski, K. Schuler, J. Bradsby
2007, Supplement to the Journal of Wildlife Diseases (43)
Biology and impacts of Pacific island invasive species. 2. Boiga irregularis, the Brown Tree Snake (Reptilia: Colubridae)
Gordon H. Rodda, Julie A. Savidge
2007, Pacific Science (61) 307-324
The Brown Tree Snake, Boiga irregularis (Merrem, 1802), was accidentally transported to the island of Guam shortly after World War II. Over the following two decades it spread throughout the island with little public or professional recognition of its extent or impacts. This secretive nocturnal arboreal snake occurs in all...
Longterm trends in nest counts of colonial seabirds in South Carolina, USA
P.G.R. Jodice, T.M. Murphy, F.J. Sanders, L.M. Ferguson
2007, Waterbirds (30) 40-51
We analyzed temporal and spatial trends in annual nest counts of Brown Pelicans (Pelecanus occidentalis), Royal Terns (Sterna maxima), and Sandwich Terns (Sterna sandvicensis) throughout South Carolina from 1969 through 2005. There was an increase in the number of active pelican nests from 1969 through the mid 1980s, although this...
Quantifying foodweb interactions with simultaneous linear equations: Stable isotope models of the Truckee River, USA
L. Saito, C. Redd, S. Chandra, L. Atwell, C.H. Fritsen, Michael R. Rosen
2007, Journal of the North American Benthological Society (26) 642-662
Aquatic foodweb models for 2 seasons (relatively high- [March] and low-flow [August] conditions) were constructed for 4 reaches on the Truckee River using ??13C and ??15N data from periphyton, macroinvertebrate, and fish samples collected in 2003 and 2004. The models were constructed with isotope values that included measured periphyton signatures...
Plumbing the global carbon cycle: Integrating inland waters into the terrestrial carbon budget
J. J. Cole, Y.T. Prairie, N.F. Caraco, W. H. McDowell, L.J. Tranvik, Robert G. Striegl, C.M. Duarte, Pirkko Kortelainen, J. A. Downing, J.J. Middelburg, J. Melack
2007, Ecosystems (10) 171-184
Because freshwater covers such a small fraction of the Earth's surface area, inland freshwater ecosystems (particularly lakes, rivers, and reservoirs) have rarely been considered as potentially important quantitative components of the carbon cycle at either global or regional scales. By taking published estimates of gas exchange, sediment accumulation, and carbon...
Natural versus anthropogenic dispersion of metals to the environment in the Wulik River area, western Brooks Range, northern Alaska
K.D. Kelley, T. Hudson
2007, Geochemistry: Exploration, Environment, Analysis (7) 87-96
Zinc-lead-silver mineral deposits in the Wulik River region, Alaska, contain an enormous accumulation of Zn. In addition to the giant deposits at Red Dog, at least nine other deposits are known. Natural weathering of these deposits has dispersed metals over a wide region over a long period of time (c....
CO2 transport over complex terrain
Jielun Sun, Sean P. Burns, A.C. Delany, S.P. Oncley, A.A. Turnipseed, B.B. Stephens, D.H. Lenschow, M.A. LeMone, Russell K. Monson, D.E. Anderson
2007, Agricultural and Forest Meteorology (145) 1-21
CO2 transport processes relevant for estimating net ecosystem exchange (NEE) at the Niwot Ridge AmeriFlux site in the front range of the Rocky Mountains, Colorado, USA, were investigated during a pilot experiment. We found that cold, moist, and CO2-rich air was transported downslope at night and upslope in the early...
