The relative influence of nutrients and habitat on stream metabolism in agricultural streams
J.D. Frankforter, H.S. Weyers, J. D. Bales, P.W. Moran, D.L. Calhoun
2010, Environmental Monitoring and Assessment (168) 461-479
Stream metabolism was measured in 33 streams across a gradient of nutrient concentrations in four agricultural areas of the USA to determine the relative influence of nutrient concentrations and habitat on primary production (GPP) and respiration (CR-24). In conjunction with the stream metabolism estimates, water quality and algal biomass samples...
Transmission and reassortment of avian influenza viruses at the Asian-North American interface
Andrew M. Ramey, John M. Pearce, Craig R. Ely, Lisa M. Sheffield Guy, David B. Irons, Dirk V. Derksen, S. Ip
2010, Virology (406) 352-359
Twenty avian influenza viruses were isolated from seven wild migratory bird species sampled at St. Lawrence Island, Alaska. We tested predictions based on previous phylogenetic analyses of avian influenza viruses that support spatially dependent trans-hemispheric gene flow and frequent interspecies transmission at a location situated at the Asian–North American interface....
Linking MODFLOW with an agent-based land-use model to support decision making
H. W. Reeves, M.L. Zellner
2010, Ground Water (48) 649-660
The U.S. Geological Survey numerical groundwater flow model, MODFLOW, was integrated with an agent-based land-use model to yield a simulator for environmental planning studies. Ultimately, this integrated simulator will be used as a means to organize information, illustrate potential system responses, and facilitate communication within a participatory modeling framework. Initial...
A physiological approach to quantifying thermal habitat quality for redband rainbow trout (Oncorhynchus mykiss gairdneri) in the south Fork John Day River, Oregon
J.W. Feldhaus, S.A. Heppell, H. Li, M.G. Mesa
2010, Environmental Biology of Fishes (87) 277-290
We examined tissue-specific levels of heat shock protein 70 (hsp70) and whole body lipid levels in juvenile redband trout (Oncorhynchus mykiss gairdneri) from the South Fork of the John Day River (SFJD), Oregon, with the goal of determining if these measures could be used as physiological indicators of thermal habitat...
GIS-based spatial regression and prediction of water quality in river networks: A case study in Iowa
X. Yang, W. Jin
2010, Journal of Environmental Management (91) 1943-1951
Nonpoint source pollution is the leading cause of the U.S.'s water quality problems. One important component of nonpoint source pollution control is an understanding of what and how watershed-scale conditions influence ambient water quality. This paper investigated the use of spatial regression to evaluate the impacts of watershed characteristics on...
Landscape influences on genetic differentiation among bull trout populations in a stream-lake network
M.H. Meeuwig, C.S. Guy, S.T. Kalinowski, W.A. Fredenberg
2010, Molecular Ecology (19) 3620-3633
This study examined the influence of landscape heterogeneity on genetic differentiation between migratory bull trout (Salvelinus confluentus) populations in Glacier National Park, Montana. An information-theoretic approach was used to compare different conceptual models of dispersal associated with barriers, different models of isolation by distance, and the combined effects of barriers,...
An approach to quantify sources, seasonal change, and biogeochemical processes affecting metal loading in streams: Facilitating decisions for remediation of mine drainage
B. A. Kimball, R.L. Runkel, K. Walton-Day
2010, Applied Geochemistry (25) 728-740
Historical mining has left complex problems in catchments throughout the world. Land managers are faced with making cost-effective plans to remediate mine influences. Remediation plans are facilitated by spatial mass-loading profiles that indicate the locations of metal mass-loading, seasonal changes, and the extent of biogeochemical processes. Field-scale experiments during both...
Three-dimensional long-period groundmotion simulations in the upper Mississippi embayment
K.A. Macpherson, E.W. Woolery, Z. Wang, P. Liu
2010, Seismological Research Letters (81) 391-405
We employed a 3D velocity model and 3D wave propagation code to simulate long-period ground motions in the upper Mississippi embayment. This region is at risk from large earthquakes in the New Madrid seismic zone (NMSZ) and observational data are sparse, making simulation a valuable tool for predicting the effects...
Hydrated mineral stratigraphy of Ius Chasma, Valles Marineris
L.H. Roach, J.F. Mustard, G. Swayze, R.E. Milliken, J.L. Bishop, S.L. Murchie, K. Lichtenberg
2010, Icarus (206) 253-268
New high-resolution spectral and morphologic imaging of deposits on walls and floor of Ius Chasma extend previous geomorphic mapping, and permit a new interpretation of aqueous processes that occurred during the development of Valles Marineris. We identify hydrated mineralogy based on visible-near infrared (VNIR) absorptions. We map the extents of...
Comparison of thiaminase activity in fish using the radiometric and 4-nitrothiophenol colorimetric methods
D. C. Honeyfield, J.W. Hanes, L. Brown, C.E. Kraft, T.P. Begley
2010, Journal of Great Lakes Research (36) 641-645
NoticeThis publication has been retracted. See the retraction notice....
Solute and heat transport model of the Henry and Hilleke laboratory experiment
C.D. Langevin, A.M. Dausman, M.C. Sukop
2010, Ground Water (48) 757-770
SEAWAT is a coupled version of MODFLOW and MT3DMS designed to simulate variable-density ground water flow and solute transport. The most recent version of SEAWAT, called SEAWAT Version 4, includes new capabilities to represent simultaneous multispecies solute and heat transport. To test the new features in SEAWAT, the laboratory experiment...
Mercury in mosses Hylocomium splendens (Hedw.) B.S.G. and Pleurozium schreberi (Brid.) Mitt. from Poland and Alaska: Understanding the origin of pollution sources
Z.M. Migaszewski, A. Galuszka, ogonekgowska S. Dole, J.G. Crock, P. J. Lamothe
2010, Ecotoxicology and Environmental Safety (73) 1345-1351
This report shows baseline concentrations of mercury in the moss species Hylocomium splendens and Pleurozium schreberi from the Kielce area and the remaining Holy Cross Mountains (HCM) region (south-central Poland), and Wrangell-Saint Elias National Park and Preserve (Alaska) and Denali National Park and Preserve (Alaska). Like mosses from many European...
The relationship between noise correlation and the Green's function in the presence of degeneracy and the absence of equipartition
V.C. Tsai
2010, Geophysical Journal International (182) 1509-1514
Recent derivations have shown that when noise in a physical system has its energy equipartitioned into the modes of the system, there is a convenient relationship between the cross correlation of time-series recorded at two points and the Green's function of the system. Here, we show that even when energy...
Identification of nitrogen sources to four small lakes in the agricultural region of Khorezm, Uzbekistan
M. Shanafield, M. Rosen, L. Saito, S. Chandra, J. Lamers, Bakhriddin Nishonov
2010, Biogeochemistry (101) 357-368
Pollution of inland waters by agricultural land use is a concern in many areas of the world, and especially in arid regions, where water resources are inherently scarce. This study used physical and chemical water quality and stable nitrogen isotope (δ15N) measurements from zooplankton to examine nitrogen (N) sources and...
Multivariate analysis of the geochemistry and mineralogy of soils along two continental-scale transects in North America
L.J. Drew, E.C. Grunsky, D. M. Sutphin, L. G. Woodruff
2010, Science of the Total Environment (409) 218-227
Soils collected in 2004 along two North American continental-scale transects were subjected to geochemical and mineralogical analyses. In previous interpretations of these analyses, data were expressed in weight percent and parts per million, and thus were subject to the effect of the constant-sum phenomenon. In a new approach to the...
A comparative analysis of double-crested cormorant diets from stomachs and pellets from two Lake Ontario colonies
James H. Johnson, Robert M. Ross, Russell D. McCullough, Alastair Mathers
2010, Journal of Freshwater Ecology (25) 669-672
Double-crested cormorant (Phalacrocorax auritus) diets were compared with evidence from the stomachs of shot birds and from regurgitated pellets at High Bluff Island and Little Galloo Island, Lake Ontario. The highest similarity in diets determined by stomach and pellet analyses occurred when both samples were collected on the same day....
Fire helps restore natural disturbance regime to benefit rare and endangered marsh birds endemic to the Colorado River
C.J. Conway, C.P. Nadeau, L. Piest
2010, Ecological Applications (20) 2024-2035
Large flood events were part of the historical disturbance regime within the lower basin of most large river systems around the world. Large flood events are now rare in the lower basins of most large river systems due to flood control structures. Endemic organisms that are adapted to this historical...
Simulation and analysis of conjunctive use with MODFLOW's farm process
R. T. Hanson, W. Schmid, C.C. Faunt, B. Lockwood
2010, Ground Water (48) 674-689
The extension of MODFLOW onto the landscape with the Farm Process (MF-FMP) facilitates fully coupled simulation of the use and movement of water from precipitation, streamflow and runoff, groundwater flow, and consumption by natural and agricultural vegetation throughout the hydrologic system at all times. This allows for more complete analysis...
Contrasting activity patterns of sympatric and allopatric black and grizzly bears
C.C. Schwartz, S.L. Cain, S. Podruzny, S. Cherry, L. Frattaroli
2010, Journal of Wildlife Management (74) 1628-1638
The distribution of grizzly (Ursus arctos) and American black bears (U. americanus) overlaps in western North America. Few studies have detailed activity patterns where the species are sympatric and no studies contrasted patterns where populations are both sympatric and allopatric. We contrasted activity patterns for sympatric black and grizzly bears...
The Medieval Climate Anomaly and Little Ice Age in Chesapeake Bay and the North Atlantic Ocean
T. M. Cronin, K. Hayo, R.C. Thunell, G. S. Dwyer, C. Saenger, Debra A. Willard
2010, Palaeogeography, Palaeoclimatology, Palaeoecology (297) 299-310
A new 2400-year paleoclimate reconstruction from Chesapeake Bay (CB) (eastern US) was compared to other paleoclimate records in the North Atlantic region to evaluate climate variability during the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA). Using Mg/Ca ratios from ostracodes and oxygen isotopes from benthic foraminifera as proxies...
Dynamics and spatio-temporal variability of environmental factors in Eastern Australia using functional principal component analysis
J.K. Szabo, E.M. Fedriani, M. M. Segovia-Gonzalez, L.B. Astheimer, M.J. Hooper
2010, Journal of Biological Systems (18) 763-785
This paper introduces a new technique in ecology to analyze spatial and temporal variability in environmental variables. By using simple statistics, we explore the relations between abiotic and biotic variables that influence animal distributions. However, spatial and temporal variability in rainfall, a key variable in ecological studies, can cause difficulties...
Using noble gases measured in spring discharge to trace hydrothermal processes in the Norris Geyser Basin, Yellowstone National Park, U.S.A.
W.P. Gardner, D. D. Susong, D. K. Solomon, H.P. Heasler
2010, Journal of Volcanology and Geothermal Research (198) 394-404
Dissolved noble gas concentrations in springs are used to investigate boiling of hydrothermal water and mixing of hydrothermal and shallow cool water in the Norris Geyser Basin area. Noble gas concentrations in water are modeled for single stage and continuous steam removal. Limitations on boiling using noble gas concentrations are...
Growth, condition factor, and bioenergetics modeling link warmer stream temperatures below a small dam to reduced performance of juvenile steelhead
S.T. Sauter, P.J. Connolly
2010, Northwest Science (84) 369-377
We investigated the growth and feeding performance of juvenile steelhead Oncorhynchus mykiss using field measures and bioenergetics modeling. Juvenile steelhead populations were sampled from mid-June through August 2004 at study sites upstream and downstream of Hemlock Dam. The growth and diet of juvenile steelhead were determined for a warm (summer)...
Decay of aftershock density with distance does not indicate triggering by dynamic stress
K. Richards-Dinger, R.S. Stein, S. Toda
2010, Nature (467) 583-586
Resolving whether static or dynamic stress triggers most aftershocks and subsequent mainshocks is essential to understand earthquake interaction and to forecast seismic hazard. Felzer and Brodsky examined the distance distribution of earthquakes occurring in the first five minutes after 2 ≤ M M M ≥ 2 aftershocks...
Longitudinal trends and discontinuities in nutrients, chlorophyll, and suspended solids in the Upper Mississippi River: Implications for transport, processing, and export by large rivers
J.N. Houser, D.W. Bierman, R.M. Burdis, L. A. Soeken-Gittinger
2010, Hydrobiologia (651) 127-144
Across the distances spanned by large rivers, there are important differences in catchment characteristics, tributary inputs, and river morphology that may cause longitudinal changes in nutrient, chlorophyll, and suspended solids concentrations. We investigated longitudinal and seasonal patterns in the Upper Mississippi River (UMR) using long-term data (1994-2005) from five study...
