Relationship between evapotranspiration and precipitation pulses in a semiarid rangeland estimated by moisture flux towers and MODIS vegetation indices
P.L. Nagler, E. P. Glenn, H. Kim, W. Emmerich, R.L. Scott, T. E. Huxman, A.R. Huete
2007, Journal of Arid Environments (70) 443-462
We used moisture Bowen ratio flux tower data and the enhanced vegetation index (EVI) from the moderate resolution imaging spectrometer (MODIS) on the Terra satellite to measure and scale evapotranspiration (ET) over sparsely vegetated grassland and shrubland sites in a semiarid watershed in southeastern Arizona from 2000 to 2004. The...
Juvenile blue crab abundances in natural and man-made tidal channels in mangrove habitat, Tampa Bay, Florida (USA)
L.A. Yeager, J.M. Krebs, C.C. McIvor, A.B. Brame
2007, Conference Paper, Bulletin of Marine Science
[No abstract available]...
A catastrophic meltwater flood event and the formation of the Hudson Shelf Valley
E. Robert Thieler, Bradford Butman, William C. Schwab, Mead A. Allison, Neal W. Driscoll, John P. Donnelly, Elazar Uchupi
2007, Palaeogeography, Palaeoclimatology, Palaeoecology (246) 120-136
The Hudson Shelf Valley (HSV) is the largest physiographic feature on the U.S. mid-Atlantic continental shelf. The 150-km long valley is the submerged extension of the ancestral Hudson River Valley that connects to the Hudson Canyon. Unlike other incised valleys on the mid-Atlantic shelf, it has not been infilled with...
Digital floodplain mapping and an analysis of errors involved
C.S. Hamblen, D.T. Soong, X. Cai
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
Mapping floodplain boundaries using geographical information system (GIS) and digital elevation models (DEMs) was completed in a recent study. However convenient this method may appear at first, the resulting maps potentially can have unaccounted errors. Mapping the floodplain using GIS is faster than mapping manually, and digital mapping is expected...
Evidence of CFC degradation in groundwater under pyrite-oxidizing conditions
L.A. Sebol, W.D. Robertson, Eurybiades Busenberg, Niel Plummer, M.C. Ryan, S.L. Schiff
2007, Journal of Hydrology (347) 1-12
A detailed local-scale monitoring network was used to assess CFC distribution in an unconfined sand aquifer in southwestern Ontario where the zone of 1–5-year-old groundwater was known with certainty because of prior use of a bromide tracer. Groundwater ⩽5 years old was confined to an aerobic zone at ⩽5 m depth and had CFC concentrations...
Geologic framework of the Mississippian Barnett Shale, Barnett-Paleozoic total petroleum system, Bend arch-Fort Worth Basin, Texas
R. M. Pollastro, D.M. Jarvie, R.J. Hill, C.W. Adams
2007, American Association of Petroleum Geologists Bulletin (91) 405-436
This article describes the primary geologic characteristics and criteria of the Barnett Shale and Barnett-Paleozoic total petroleum system (TPS) of the Fort Worth Basin used to define two geographic areas of the Barnett Shale for petroleum resource assessment. From these two areas, referred to as "assessment units," the U.S. Geological...
Nature, diversity of deposit types and metallogenic relations of South China
K. Zaw, S. G. Peters, P. Cromie, C. Burrett, Z. Hou
2007, Ore Geology Reviews (31) 3-47
The South China Region is rich in mineral resources and has a wide diversity of deposit types. The region has undergone multiple tectonic and magmatic events and related metallogenic processes throughout the earth history. These tectonic and metallogenic processes were responsible for the formation of the diverse styles of base...
Dynamics of CFCs in northern temperate lakes and adjacent groundwater
John F. Walker, David A. Saad, Randall J. Hunt
2007, Water Resources Research (43)
Three dimictic lakes and one meromictic lake in and near the Trout Lake, Wisconsin, watershed were sampled to determine the variation of chlorofluorocarbon (CFC) concentrations within the lakes. The lakes were sampled during stratified conditions, during fall turnover, and during ice cover. The results demonstrate a considerable variation in CFC...
Comparative lahar hazard mapping at Volcan Citlaltépetl, Mexico using SRTM, ASTER and DTED-1 digital topographic data
Bernard E. Hubbard, Michael F. Sheridan, Gerardo Carrasco-Nunez, Rodolfo Diaz-Castellon, Sergio R. Rodriguez
2007, Journal of Volcanology and Geothermal Research (160) 99-124
In this study, we evaluated and compared the utility of spaceborne SRTM and ASTER DEMs with baseline DTED-1 “bald-earth” topography for mapping lahar inundation hazards from volcan Citlaltépetl, Mexico, a volcano which has had a history of producing debris flows of various extents. In particular, we tested the utility...
Ranking Alaska moose nutrition: Signals to begin liberal antlerless harvests
Rodney D. Boertje, Kalin A. Kellie, C. Tom Seaton, Mark A. Keech, Donald D. Young, Bruce W. Dale, Layne G. Adams, Andrew R. Aderman
2007, Journal of Wildlife Management (71) 1494-1506
We focused on describing low nutritional status in an increasing moose (Alces alces gigas) population with reduced predation in Game Management Unit (GMU) 20A near Fairbanks, Alaska, USA. A skeptical public disallowed liberal antlerless harvests of this moose population until we provided convincing data on low nutritional status. We ranked...
Flocculation, heavy metals (Cu, Pb, Zn) and the sand-mud transition on the Adriatic continental shelf, Italy
D.A. George, P.S. Hill, T.G. Milligan
2007, Continental Shelf Research (27) 475-488
Across a limited depth range (5-10 m) on many continental shelves, the dominant sediment size changes from sand to mud. This important boundary, called the sand-mud transition (SMT), separates distinct benthic habitats, causes a significant change in acoustic backscatter, represents a key facies change, and delimits more surface-reactive mud from...
A global organism detection and monitoring system for non-native species
J. Graham, G. Newman, C. Jarnevich, R. Shory, T.J. Stohlgren
2007, Ecological Informatics (2) 177-183
Harmful invasive non-native species are a significant threat to native species and ecosystems, and the costs associated with non-native species in the United States is estimated at over $120 Billion/year. While some local or regional databases exist for some taxonomic groups, there are no effective geographic databases designed to detect...
Enhancing water cycle measurements for future hydrologic research
H.W. Loescher, J.M. Jacobs, O. Wendroth, D.A. Robinson, G.S. Poulos, K. McGuire, P. Reed, B.P. Mohanty, J. B. Shanley, W. Krajewski
2007, Bulletin of the American Meteorological Society (88) 669-676
The Consortium of Universities for the Advancement of Hydrologic Sciences, Inc., established the Hydrologic Measurement Facility to transform watershed-scale hydrologic research by facilitating access to advanced instrumentation and expertise that would not otherwise be available to individual investigators. We outline a committee-based process that determined which suites of instrumentation best...
Assessment of marine-derived nutrients in the Copper River Delta, Alaska, using natural abundance of the stable isotopes of nitrogen, sulfur, and carbon
Thomas C. Kline, Carol Ann Woody, Mary Anne Bishop, Sean P. Powers, E. Eric Knudsen
2007, American Fisheries Society Symposium (54) 51-60
We performed nitrogen, sulfur, and carbon stable isotope analysis (SIA) on maturing and juvenile anadromous sockeye and coho salmon, and periphyton in two Copper River delta watersheds of Alaska to trace salmonderived nutrients during 2003–2004. Maturing salmon were isotopically enriched relative to alternate freshwater N, S, and C sources as...
Mercury in sediments, Alviso and Eden Landing salt ponds, south San Francisco Bay, California
A.K. Miles, M.A. Ricca, S.E. Spring, C. Morris, C. Wilcox, T. Maurer
2007, Conference Paper, Proceedings, Society of Wetland Scientists International Conference
No abstract available....
New technologies at the Desert Research Institute make a difference in wildland fire management
Timothy J. Brown, Crystal A. Kolden
2007, Wildland Firefighter (11) 28-32
No abstract available....
Tower counts
Carol Ann Woody
2007, Book chapter, Salmonid Field Protocols Handbook: Techniques for Assessing Status and Trends in Salmon and Trout Populations
Counting towers provide an accurate, low-cost, low-maintenance, low-technology, and easily mobilized escapement estimation program compared to other methods (e.g., weirs, hydroacoustics, mark-recapture, and aerial surveys) (Thompson 1962; Siebel 1967; Cousens et al. 1982; Symons and Waldichuk 1984; Anderson 2000; Alaska Department of Fish and Game 2003). Counting tower data has...
Effects of flow diversions on water and habitat quality: Examples from California's highly manipulated Sacramento–San Joaquin Delta
Nancy E. Monsen, James E. Cloern, Jon R. Burau
2007, San Francisco Estuary and Watershed Science (5)
We use selected monitoring data to illustrate how localized water diversions from seasonal barriers, gate operations, and export pumps alter water quality across the Sacramento-San Joaquin Delta (California). Dynamics of water-quality variability are complex because the Delta is a mixing zone of water from the Sacramento and San Joaquin Rivers,...
Efficiently estimating salmon escapement uncertainty using systematically sampled data
Joel H. Reynolds, Carol Ann Woody, Nancy E. Gove, Lowell F. Fair
2007, American Fisheries Society Symposium (54) 121-129
Fish escapement is generally monitored using nonreplicated systematic sampling designs (e.g., via visual counts from towers or hydroacoustic counts). These sampling designs support a variety of methods for estimating the variance of the total escapement. Unfortunately, all the methods give biased results, with the magnitude of the bias being determined...
Fire risk in San Diego County, California: A weighted Bayesian model approach
Crystal A. Kolden, Timothy J. Weigel
2007, California Geographer (47) 42-60
Fire risk models are widely utilized to mitigate wildfire hazards, but models are often based on expert opinions of less understood fire-ignition and spread processes. In this study, we used an empirically derived weights-of-evidence model to assess what factors produce fire ignitions east of San Diego, California. We created and...
The blind men and the elephant: Concerns about the use of juvenile proportion data
Brian J. McCaffery, Colleen M. Handel, Robert E. Gill Jr., Daniel R. Ruthrauff
2007, Stilt - The journal for the East Asian-Australasian Flyway (50) 194-204
Juvenile proportion data in shorebirds are being used with increasing frequency to estimate recruitment and even breeding success. Although this area of investigation holds great promise, flaws in current study designs preclude great confidence in the broad-scale inferences being drawn. We present data from our own investigations on juvenile proportions...
Signatures of mountain building: Detrital zircon U/Pb ages from northeast Tibet
Richard O. Lease, Douglas W. Burbank, George E. Gehrels, Zhicai Wang, Daoyang Yuan
2007, Geology (35) 239-242
Although detrital zircon has proven to be a powerful tool for determining provenance, past work has focused primarily on delimiting regional source terranes. Here we explore the limits of spatial resolution and stratigraphic sensitivity of detrital zircon in ascertaining provenance, and we demonstrate its ability to detect source changes for...
Inventory of montane-nesting birds in Katmai and Lake Clark national parks and preserves
Daniel R. Ruthrauff, T. Lee Tibbitts, Robert E. Gill Jr., Colleen M. Handel
2007, Report
As part of the National Park Service’s Inventory and Monitoring Program, biologists from the U. S. Geological Survey’s Alaska Science Center conducted an inventory of birds in montane regions of Katmai and Lake Clark National Parks and Preserves during 2004–2006. We used a stratified random survey design to allocate samples...
Concordance of nuclear and mitochondrial DNA markers in detecting a founder event in Lake Clark sockeye salmon
Kristina M. Ramstad, Carol Ann Woody, Chris Habicht, G. Kevin Sage, James E. Seeb, Fred W. Allendorf
2007, American Fisheries Society Symposium (54) 31-50
Genetic bottleneck effects can reduce genetic variation, persistence probability, and evolutionary potential of populations. Previous microsatellite analysis suggested a bottleneck associated with a common founding of sock-eye salmon Oncorhynchus nerka populations of Lake Clark, Alaska, about 100 to 400 generations ago. The common foundingevent occurred after the last glacial recession...
Two new genera of Lumbriculidae (Annelida, Clitellata) from North Carolina, USA
S.V. Fend, D. R. Lenat
2007, Zootaxa 1-22
Recent benthic macroinvertebrate collections from North Carolina contained many undescribed oligochaete taxa, mostly belonging to the family Lumbriculidae. Three of the new species had arrangements of spermathecae and atria previously unreported for the family, and were assigned to new two genera. Pilaridrilus is distinguished by the location of spermathecal pores...
