Restoration of wildcelery, Vallisneria americana Michx., in the lower Detroit River of the Lake Huron-Lake Erie Corridor
D. W. Schloesser, B.A. Manny
2007, Journal of Great Lakes Research (33) 8-19
American wildcelery (Vallisneria americana Michx.) is a valuable submersed aquatic plant that was negatively affected by pollution and urban runoff in the lower Detroit River for much of the 20th century. Following 25 years of water-pollution and urban-runoff abatement initiated in the early 1970s, we postulated that water clarity had...
Genetic variability in spotted seatrout (Cynoscion nebulosus), determined with microsatellite DNA markers
R. Ward, K. Bowers, R. Hensley, B. Mobley, E. Belouski
2007, Fishery Bulletin (105) 197-206
Variation in the allele frequencies of five microsatellite loci was surveyed in 1256 individual spotted seatrout (Cynoscion nebulosus) obtained from 12 bays and estuaries from Laguna Madre, Texas, to Charlotte Harbor, Florida, to St. John's River on the Florida Atlantic Coast. Texas and Louisiana collection sites were resampled each year...
Porphyry copper deposit tract definition - A global analysis comparing geologic map scales
G. L. Raines, K.A. Connors, L.B. Chorlton
2007, Natural Resources Research (16) 191-198
Geologic maps are a fundamental data source used to define mineral-resource potential tracts for the first step of a mineral resource assessment. Further, it is generally believed that the scale of the geologic map is a critical consideration. Previously published research has demonstrated that the U.S. Geological Survey porphyry tracts...
Cascading events in linked ecological and socioeconomic systems
Debra P. C. Peters, O.E. Sala, Craig D. Allen, A. Covich, M. Brunson
2007, Frontiers in Ecology and the Environment (5) 221-224
Cascading events that start at small spatial scales and propagate non-linearly through time to influence larger areas often have major impacts on ecosystem goods and services. Events such as wildfires and hurricanes are increasing in frequency and magnitude as systems become more connected through globalization processes. We need to improve...
High-resolution sequence stratigraphy of lower Paleozoic sheet sandstones in central North America: The role of special conditions of cratonic interiors in development of stratal architecture
Anthony C. Runkel, J.F. Miller, R.M. McKay, A. R. Palmer, John F. Taylor
2007, Geological Society of America Bulletin (119) 860-881
Well-known difficulties in applying sequence stratigraphic concepts to deposits that accumulated across slowly subsiding cratonic interior regions have limited our ability to interpret the history of continental-scale tectonism, oceanographic dynamics of epeiric seas, and eustasy. We used a multi-disciplinary approach to construct a high-resolution stratigraphic framework for lower Paleozoic strata...
Effect of tidal fluctuations on contaminant transfer to the ocean
I.L. Licata, C.D. Langevin, A.M. Dausman
2007, Conference Paper, IAHS-AISH Publication
Variable-density groundwater flow was simulated to examine the effects that tide has on the coastward migration of a contaminant through a freshwater/saltwater interface and toward a coastal ocean boundary. Simulated ocean tides did not significantly affect the total contaminant mass input to the ocean; however, the difference in tidal and...
The influence of extractable organic matter on vitrinite reflectance suppression: A survey of kerogen and coal types
C.E. Barker, M. D. Lewan, M. J. Pawlewicz
2007, International Journal of Coal Geology (70) 67-78
The vitrinite reflectance suppression literature shows that while bitumen impregnation of the vitrinite group is often invoked as a significant contributor to suppression, its existence is not often supported by petrological evidence. This study examines bitumen impregnation as a factor in vitrinite suppression by comparing the vitrinite reflectance of source...
Remaining uncertainties in the use of Rn-222 as a quantitative tracer of submarine groundwater discharge
W. C. Burnett, I.R. Santos, Y. Weinstein, P.W. Swarzenski, B. Herut
2007, Conference Paper, IAHS-AISH Publication
Research performed in many locations over the past decade has shown that radon is an effective tracer for quantifying submarine groundwater discharge (SGD). The technique works because both fresh and saline groundwaters acquire radon from the subterranean environment and display activities that are typically orders of magnitude greater than those...
Distribution and abundance of burrowing mayflies (Hexagenia spp.) in Lake Erie, 1997-2005
K.A. Krieger, M.T. Bur, J.J.H. Ciborowski, D.R. Barton, D. W. Schloesser
2007, Journal of Great Lakes Research (33) 20-33
Burrowing mayflies (Hexagenia limbata and H. rigida) recolonized sediments of the western basin of Lake Erie in the 1990s following decades of pollution abatement. We predicted that Hexageniawould also disperse eastward or expand from existing localized populations and colonize large regions of the other basins. We sampled zoobenthos in parts of the western...
DOM in recharge waters of the Santa Ana River Basin
J.A. Leenheer, G. R. Aiken, G. Woodside, K. O’Connor-Patel
2007, Journal - American Water Works Association (99) 118-131
Assessment of the composition, reactivity, and potential health effects of dissolved organic matter (DOM) is an important issue in the regulation and operation of groundwater recharge projects. The composition of DOM in various natural surface waters and reclaimed waters used to recharge the alluvial aquifers of the lower Santa Ana...
Depredation of common eider, Somateria mollissima, nests on a central Beaufort Sea barrier island: A case where no one wins
John A. Reed, Deborah L. Lacroix, Paul L. Flint
2007, Canadian Field-Naturalist (121) 308-312
Along the central Beaufort Sea, Pacific Common Eiders (Somateria mollissima v-nigra) nest on unvegetated, barrier islands; often near nesting Glaucous Gulls (Larus hyperboreus). Nest-site choice likely reflects a strategy of predator avoidance: nesting on islands to avoid mammalian predators and near territorial gulls to avoid other avian predators. We observed...
Hydrologic response of the Crow Wing Watershed, Minnesota, to mid-Holocene climate change
M. Person, P. Roy, H. Wright, W. Gutowski Jr., E. Ito, T. Winter, D. Rosenberry, D. Cohen
2007, Geological Society of America Bulletin (119) 363-376
In this study, we have integrated a suite of Holocene paleoclimatic proxies with mathematical modeling in an attempt to obtain a comprehensive picture of how watersheds respond to past climate change. A three-dimensional surface-water-groundwater model was developed to assess the effects of mid-Holocene climate change on water resources within the...
Changes in a population of exotic rainbow smelt in Lake Superior: Boom to bust, 1974-2005
O. T. Gorman
2007, Journal of Great Lakes Research (33) 75-90
Changes in a population of rainbow smelt (Osmerus mordax) in the Apostle Islands region of Lake Superior were chronicled over a 32-yr time series, 1974–2005. At the beginning of the time series, rainbow smelt was the predominant prey species, abundance of lake herring (Coregonis artedi) was very low, and the...
A simple daily soil-water balance model for estimating the spatial and temporal distribution of groundwater recharge in temperate humid areas
W. R. Dripps, K. R. Bradbury
2007, Hydrogeology Journal (15) 433-444
Quantifying the spatial and temporal distribution of natural groundwater recharge is usually a prerequisite for effective groundwater modeling and management. As flow models become increasingly utilized for management decisions, there is an increased need for simple, practical methods to delineate recharge zones and quantify recharge rates. Existing models for estimating...
Cosmogenic 10Be and 36Cl geochronology of offset alluvial fans along the northern Death Valley fault zone: Implications for transient strain in the eastern California shear zone
K.L. Frankel, K.S. Brantley, J.F. Dolan, R.C. Finkel, R.E. Klinger, J.R. Knott, M. N. Machette, L.A. Owen, F. M. Phillips, J. L. Slate, B.P. Wernicke
2007, Journal of Geophysical Research B: Solid Earth (112)
The northern Death Valley fault zone (NDVFZ) has long been recognized as a major right-lateral strike-slip fault in the eastern California shear zone (ECSZ). However, its geologic slip rate has been difficult to determine. Using high-resolution digital topographic imagery and terrestrial cosmogenic nuclide dating, we present the first geochronologically determined...
Airborne desert dust and aeromicrobiology over the Turkish Mediterranean coastline
Dale W. Griffin, Nilgun Kubilay, Mustafa Kocak, Mike A. Gray, Timothy C. Borden, Eugene A. Shinn
2007, Atmospheric Environment (41) 4050-4062
Between 18 March and 27 October 2002, 220 air samples were collected on 209 of 224 calendar days, on top of a coastal atmospheric research tower in Erdemli, Turkey. The volume of air filtered for each sample was 340 liters. Two hundred fifty-seven bacterial and 2598 fungal colony forming units...
Interactions between slimy sculpin and trout: Slimy sculpin growth and diet in relation to native and nonnative trout
J. K. H. Zimmerman, B. Vondracek
2007, Transactions of the American Fisheries Society (136) 1791-1800
To investigate whether introductions of nonnative trout affect growth and diet of nongame fish in small streams, we designed a field experiment to examine interactions between slimy sculpin Cottus cognatus and native brook trout Salvelinus fontinalis or nonnative brown trout Salmo trutta. We hypothesized that brown trout would compete with...
Sediment compaction rates and subsidence in deltaic plains: Numerical constraints and stratigraphic influences
T.A. Meckel, Uri S. ten Brink, S.J. Williams
2007, Basin Research (19) 19-31
Natural sediment compaction in deltaic plains influences subsidence rates and the evolution of deltaic morphology. Determining compaction rates requires detailed knowledge of subsurface geotechnical properties and depositional history, neither of which is often readily available. To overcome this lack of knowledge, we numerically forward model the incremental sedimentation and compaction...
Variable role of aquatic macroinvertebrates in initial breakdown of seasonal leaf litter inputs to a cold-desert river
S. M. Nelson, D.C. Andersen
2007, Southwestern Naturalist (52) 219-228
We used coarse-mesh and fine-mesh leafpacks to examine the importance of aquatic macroinvertebrates in the breakdown of floodplain tree leaf litter that seasonally entered a sand-bedded reach of the sixth-order Yampa River in semiarid Colorado. Leafpacks were positioned off the easily mobilized channel bed, mimicking litter trapped in debris piles....
Mercury exposure and effects on cavity-nesting birds from the Carson River, Nevada
Christine M. Custer, T. W. Custer, E. F. Hill
2007, Archives of Environmental Contamination and Toxicology (52) 129-136
Mercury (Hg) concentrations were 15-40 times higher in the eggs and livers of tree swallows (Tachycineta bicolor) and house wrens (Troglodytes aedon) that nested along the Carson River at and below Dayton, Nevada than in the same species above the mining-impacted areas. Hg contamination was mainly the result of processing...
Comparative growth and consumption potential of rainbow trout and humpback chub in the Colorado River, Grand Canyon, Arizona, under different temperature scenarios
C.P. Paukert, J.H. Petersen
2007, Southwestern Naturalist (52) 234-242
We used bioenergetics models for humpback chub, Gila cypha, and rainbow trout, Oncorhynchus mykiss, to examine how warmer water temperatures in the Colorado River, Grand Canyon, Arizona, through a proposed selective withdrawal system (SWS) at Glen Canyon Dam, would affect growth, consumption, and predation rates. Consumption by the rainbow trout...
Heat transport in the Red Lake Bog, Glacial Lake Agassiz Peatlands
J.M. McKenzie, D. I. Siegel, Donald O. Rosenberry, P.H. Glaser, Clifford I. Voss
2007, Hydrological Processes (21) 369-378
We report the results of an investigation on the processes controlling heat transport in peat under a large bog in the Glacial Lake Agassiz Peatlands. For 2 years, starting in July 1998, we recorded temperature at 12 depth intervals from 0 to 400 cm within a vertical peat profile at...
Egg flotation estimates nest age for Pacific and Red-throated Loons
Daniel Rizzolo, Joel A. Schmutz
2007, Waterbirds (30) 207-213
We used Pacific Loon (Gavia pacifica) and Red-throated Loon (G. stellata) nests with known ages to gauge the efficacy of egg flotation for determining nest age in coastal Alaska. Egg flotation accurately estimated nest age for both species; the mean ± 1SD difference between known age and age determined with egg...
Waveform inversion of volcano-seismic signals for an extended source
M. Nakano, Hiroyuki Kumagai, B. Chouet, P. Dawson
2007, Journal of Geophysical Research B: Solid Earth (112)
[1] We propose a method to investigate the dimensions and oscillation characteristics of the source of volcano-seismic signals based on waveform inversion for an extended source. An extended source is realized by a set of point sources distributed on a grid surrounding the centroid of...
Dating young geomorphic surfaces using age of colonizing Douglas fir in southwestern Washington and northwestern Oregon, USA
T.C. Pierson
2007, Earth Surface Processes and Landforms (32) 811-831
Dating of dynamic, young (<500 years) geomorphic landforms, particularly volcanofluvial features, requires higher precision than is possible with radiocarbon dating. Minimum ages of recently created landforms have long been obtained from tree-ring ages of the oldest trees growing on new surfaces. But to estimate the year of landform creation requires...
