Geomorphic and sedimentologic evidence for the separation of Lake Superior from Lake Michigan and Huron
J.W. Johnston, T.A. Thompson, D.A. Wilcox, S.J. Baedke
2007, Journal of Paleolimnology (37) 349-364
A common break was recognized in four Lake Superior strandplain sequences using geomorphic and sedimentologic characteristics. Strandplains were divided into lakeward and landward sets of beach ridges using aerial photographs and topographic surveys to identify similar surficial features and core data to identify similar subsurface features. Cross-strandplain, elevation-trend changes from...
Variation in the establishment of a non-native annual grass influences competitive interactions with Mojave Desert perennials
L.A. DeFalco, G.C.J. Fernandez, R.S. Nowak
2007, Biological Invasions (9) 293-307
Competition between native and non-native species can change the composition and structure of plant communities, but in deserts, the highly variable timing of resource availability also influences non-native plant establishment, thus modulating their impacts on native species. In a field experiment, we varied densities of the non-native annual grass Bromus...
Restoring coastal wetlands that were ditched for mosquito control: a preliminary assessment of hydro-leveling as a restoration technique
Thomas J. Smith III, Ginger Tiling, Pamela S. Leasure
2007, Journal of Coastal Conservation (11) 67-74
The wetlands surrounding Tampa Bay, Florida were extensively ditched for mosquito control in the 1950s. Spoil from ditch construction was placed adjacent to the wetlands ditches creating mound-like features (spoil-mounds). These mounds represent a loss of 14% of the wetland area in Tampa Bay. Spoil mounds interfere with tidal flow...
Late Quaternary paleoenvironments of an ephemeral wetland in North Dakota, USA: Relative interactions of ground-water hydrology and climate change
C.H. Yansa, W.E. Dean, E.C. Murphy
2007, Journal of Paleolimnology (38) 441-457
This study of fossils (pollen, plant macrofossils, stomata and fish) and sediments (lithostratigraphy and geochemistry) from the Wendel site in North Dakota, USA, emphasizes the importance of considering ground-water hydrology when deciphering paleoclimate signals from lakes in postglacial landscapes. The Wendel site was a paleolake from about 11,500 14C yr...
An evaluation of freshwater mussel toxicity data in the derivation of water quality guidance and standards for copper
F.A. March, F.J. Dwyer, T. Augspurger, C.G. Ingersoll, N. Wang, C.A. Mebane
2007, Environmental Toxicology and Chemistry (26) 2066-2074
The state of Oklahoma has designated several areas as freshwater mussel sanctuaries in an attempt to provide freshwater mussel species a degree of protection and to facilitate their reproduction. We evaluated the protection afforded freshwater mussels by the U.S. Environmental Protection Agency (U.S. EPA) hardness-based 1996 ambient copper water quality...
Compositional zoning of the Bishop Tuff
W. Hildreth, C. J. N. Wilson
2007, Journal of Petrology (48) 951-999
Compositional data for >400 pumice clasts, organized according to eruptive sequence, crystal content, and texture, provide new perspectives on eruption and pre-eruptive evolution of the >600 km3 of zoned rhyolitic magma ejected as the Bishop Tuff during formation of Long Valley caldera. Proportions and compositions of different pumice types are given for...
Pharmaceuticals in on-site sewage effluent and ground water, Western Montana
E. Godfrey, W.W. Woessner, M.J. Benotti
2007, Ground Water (45) 263-271
Human use of pharmaceuticals results in the excretion and disposal of compounds that become part of municipal and domestic waste streams. On-site waste water disposal and leaking city sewer systems can provide avenues for the migration of effluent to the underlying aquifers. This research assessed the occurrence and persistence of...
Ambiguous taxa: Effects on the characterization and interpretation of invertebrate assemblages
T. F. Cuffney, Michael D. Bilger, A.M. Haigler
2007, Journal of the North American Benthological Society (26) 286-307
Damaged and immature specimens often result in macroinvertebrate data that contain ambiguous parent-child pairs (i.e., abundances associated with multiple related levels of the taxonomic hierarchy such as Baetis pluto and the associated ambiguous parent Baetis sp.). The choice of method used to resolve ambiguous parent-child pairs may have a very...
Early vegetation development on an exposed reservoir: Implications for dam removal
G.T. Auble, P.B. Shafroth, M. L. Scott, J. E. Roelle
2007, Environmental Management (39) 806-818
The 4-year drawdown of Horsetooth Reservoir, Colorado, for dam maintenance, provides a case study analog of vegetation response on sediment that might be exposed from removal of a tall dam. Early vegetation recovery on the exposed reservoir bottom was a combination of (1) vegetation colonization on bare, moist substrates typical...
Biotransformation of caffeine, cotinine, and nicotine in stream sediments: Implications for use as wastewater indicators
Paul M. Bradley, Larry B. Barber, Dana W. Kolpin, Peter B. McMahon, Francis H. Chapelle
2007, Environmental Toxicology and Chemistry (26) 1116-1121
Microbially catalyzed cleavage of the imadazole ring of caffeine was observed in stream sediments collected upstream and downstream of municipal wastewater treatment plants (WWTP) in three geographically separate stream systems. Microbial demethylation of the N-methyl component of cotinine and its metabolic precursor, nicotine, also was observed in these sediments. These...
Response of the St. Joseph River to lake level changes during the last 12,000 years in the Lake Michigan basin
K.A. Kincare
2007, Journal of Paleolimnology (37) 383-394
The water level of the Lake Michigan basin is currently 177 m above sea level. Around 9,800 14C years B.P., the lake level in the Lake Michigan basin had dropped to its lowest level in prehistory, about 70 m above sea level. This low level (Lake Chippewa) had profound effects...
Quantifying tolerance indicator values for common stream fish species of the United States
M. R. Meador, D.M. Carlisle
2007, Ecological Indicators (7) 329-338
The classification of fish species tolerance to environmental disturbance is often used as a means to assess ecosystem conditions. Its use, however, may be problematic because the approach to tolerance classification is based on subjective judgment. We analyzed fish and physicochemical data from 773 stream sites collected as part of...
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...
Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh
Heather A. Lowers, George N. Breit, Andrea L. Foster, John W. Whitney, James Yount, Nehal Uddin, Ad. Atual Muneem
2007, Geochimica et Cosmochimica Acta (71) 2699-2717
Sediment from two deep boreholes (∼400 m) approximately 90 km apart in southern Bangladesh was analyzed by X-ray absorption spectroscopy (XAS), total chemical analyses, chemical extractions, and electron probe microanalysis to establish the importance of authigenic pyrite as a sink for arsenic in...
Temperature and diet effects on omnivorous fish performance: Implications for the latitudinal diversity gradient in herbivorous fishes
M.D. Behrens, K. D. Lafferty
2007, Canadian Journal of Fisheries and Aquatic Sciences (64) 867-873
Herbivorous fishes show a clear latitudinal diversity gradient, making up a larger proportion of the fish species in a community in tropical waters than in temperate waters. One proposed mechanism that could drive this gradient is a physiological constraint due to temperature. One prediction based on this mechanism is that...
Relative influence of streamflows in assessing temporal variability in stream habitat
R. M. Goldstein, M. R. Meador, K.E. Ruhl
2007, Journal of the American Water Resources Association (43) 642-650
The effects of streamflows on temporal variation in stream habitat were analyzed from the data collected 6-11 years apart at 38 sites across the United States. Multiple linear regression was used to assess the variation in habitat caused by streamflow at the time of sampling and high flows between sampling....
Sources and temporal dynamics of arsenic in a New Jersey watershed, USA
J. L. Barringer, J.L. Bonin, M.J. DeLuca, T. Romagna, K. Cenno, M. Alebus, T. Kratzer, B. Hirst
2007, Science of the Total Environment (379) 56-74
We examined potential sources and the temporal dynamics of arsenic (As) in the slightly alkaline waters of the Wallkill River, northwestern New Jersey, where violations of water-quality standards have occurred. The study design included synoptic sampling of stream water and bed sediments in...
The effect of long-term spatiotemporal variations in urbanization-induced eutrophication on a benthic ecosystem, Osaka Bay, Japan
Moriaki Yasuhara, Hideo Yamazaki, Akira Tsujimoto, K. Hirose
2007, Limnology and Oceanography (52) 1633-1644
Detailed spatiotemporal patterns of the influence of urbanization-induced eutrophication on a metazoan benthic community in Osaka Bay were determined using sediment cores and fossil ostracode assemblages from the last 200 yr. Results suggest that total abundance of ostracodes increased in the middle part of the bay as a result of...
A post-Calumet shoreline along southern Lake Michigan
D.K. Capps, T.A. Thompson, R.K. Booth
2007, Journal of Paleolimnology (37) 395-409
The southern shore of Lake Michigan is the type area for many of ancestral Lake Michigan's late Pleistocene lake phases, but coastal deposits and features of the Algonquin phase of northern Lake Michigan, Lake Huron, and Lake Superior are not recognized in the area. Isostatic rebound models suggest that Algonquin...
Holocene sea-level oscillations and environmental changes on the Eastern Black Sea shelf
E.V. Ivanova, I.O. Murdmaa, A.L. Chepalyga, T. M. Cronin, I.V. Pasechnik, O.V. Levchenko, S. S. Howe, A.V. Manushkina, E.A. Platonova
2007, Palaeogeography, Palaeoclimatology, Palaeoecology (246) 228-259
A multi-proxy study of four sediment cores from the Eastern (Caucasian) Black Sea shelf revealed five transgressive-regressive cycles overprinted on the general trend of glacioeustatic sea-level rise during the last 11,000??14C yr. These cycles are well represented in micro-and macrofossil assemblages, sedimentation rates, and grain size variations. The oldest recovered...
Free zinc ion and dissolved orthophosphate effects on phytoplankton from Coeur d'Alene Lake, Idaho
James S. Kuwabara, Brent R. Topping, Paul F. Woods, James L. Carter
2007, Environmental Science & Technology (41) 2811-2817
Coeur d'Alene Lake in northern Idaho is fed by two major rivers: the Coeur d'Alene River from the east and the St. Joe River from the south, with the Spokane River as its outlet to the north. This phosphorus-limited lake has been subjected to decades of mining (primarily for zinc...
Organic compounds in produced waters from coalbed natural gas wells in the Powder River Basin, Wyoming, USA
W. H. Orem, C. A. Tatu, H.E. Lerch, C. A. Rice, T.T. Bartos, A. L. Bates, S. Tewalt, M.D. Corum
2007, Applied Geochemistry (22) 2240-2256
The organic composition of produced water samples from coalbed natural gas (CBNG) wells in the Powder River Basin, WY, sampled in 2001 and 2002 are reported as part of a larger study of the potential health and environmental effects of organic compounds derived from coal. The quality of CBNG produced...
Forward model nonlinearity versus inverse model nonlinearity
S. Mehl
2007, Ground Water (45) 791-794
The issue of concern is the impact of forward model nonlinearity on the nonlinearity of the inverse model. The question posed is, "Does increased nonlinearity in the head solution (forward model) always result in increased nonlinearity in the inverse solution (estimation of hydraulic conductivity)?" It is shown that the two...
The relationship between productivities of salmonids and forest stands in northern California watersheds
S.L. Frazey, M.A. Wilzbach
2007, Western Journal of Applied Forestry (22) 73-80
Productivities of resident salmonids and upland and riporian forests in 22 small watersheds of coastal northern California were estimated and compared to determine whether: 1) upland site productivity predicted riparian site productivity; 2) either upland or riparian site productivity predicted salmonid productivity; and 3) other parameters explained more of the...
Fractal topography and subsurface water flows from fluvial bedforms to the continental shield
A. Worman, A.I. Packman, L. Marklund, J. W. Harvey, S.H. Stone
2007, Geophysical Research Letters (34)
Surface-subsurface flow interactions are critical to a wide range of geochemical and ecological processes and to the fate of contaminants in freshwater environments. Fractal scaling relationships have been found in distributions of both land surface topography and solute efflux from watersheds, but the linkage between those observations has not been...
