Multiple baseline radar interferometry applied to coastal land cover classification and change analyses
Elijah W. Ramsey III, Z. Lu, A. Rangoonwala, Russ Rykhus
2006, GIScience and Remote Sensing (43) 283-309
ERS-1 and ERS-2 SAR data were collected in tandem over a four-month period and used to generate interferometric coherence, phase, and intensity products that we compared to a classified land cover coastal map of Big Bend, Florida. Forests displayed the highest intensity, and marshes the lowest. The intensity for fresh...
Distribution of spawning activity by anadromous fishes in an atlantic slope drainage after removal of a low-head dam
S. M. Burdick, J.E. Hightower
2006, Transactions of the American Fisheries Society (135) 1290-1300
In 1998, the Quaker Neck Dam was removed from the Neuse River near Goldsboro, North Carolina, restoring access to more than 120 km of potential main-stem spawning habitat and 1,488 km of potential tributary spawning habitat to anadromous fishes. We used plankton sampling and standardized electrofishing to examine the extent...
River size and fish assemblages in southwestern South Dakota
C.W. Hoagstrom, S.S. Wall, J.P. Duehr, C. R. Berry Jr.
2006, Great Plains Research (16) 117-126
We studied relations between river size, fish species diversity, and fish species composition along four major rivers in the Great Plains of southwestern South Dakota to assess patterns of species diversity and composition. We expected diversity to increase with river size and fish composition to change via species addition downstream....
Bluff evolution along coastal drumlins: Boston Harbor Islands, Massachusetts
E. A. Himmelstoss, D. M. FitzGerald, P.S. Rosen, J.R. Allen
2006, Journal of Coastal Research (22) 1230-1240
A series of partially drowned drumlins forms the backbone of the inner islands within Boston Harbor. The shoreline of these rounded glacial deposits is composed of actively retreating bluffs formed by continual wave attack. Comparisons of bluffs reveal variability in their height and lateral extent, as well as in the...
Effects of substrate and hydrodynamic conditions on the formation of mussel beds in a large river
Y. Morales, L.J. Weber, A.E. Mynett, T.J. Newton
2006, Journal of the North American Benthological Society (25) 664-676
A numerical model for simulation of freshwater mussel dynamics was used to investigate the effects of substrate and hydrodynamic conditions on the formation of mussel beds in a 10-km reach of the Upper Mississippi River (UMR). Suitable habitats for mussel survival were identified by creating a dimensionless parameter (shear stress...
Devils Hole, Nevada, δ18O record extended to the mid-Holocene
Isaac J. Winograd, Jurate M. Landwehr, Tyler B. Coplen, Warren D. Sharp, Alan C. Riggs, Kenneth R. Ludwig, Peter T. Kolesar
2006, Quaternary Research (66) 202-212
The mid-to-late Pleistocene Devils Hole δ18O record has been extended from 60,000 to 4500 yr ago. The new δ18O time series, in conjunction with the one previously published, is shown to be a proxy of Pacific Ocean sea surface temperature (SST) off the coast of California. During marine oxygen isotope stages...
The composite method: An improved method for stream-water solute load estimation
Brent T. Aulenbach, R. P. Hooper
2006, Hydrological Processes (20) 3029-3047
The composite method is an alternative method for estimating stream-water solute loads, combining aspects of two commonly used methods: the regression-model method (which is used by the composite method to predict variations in concentrations between collected samples) and a period-weighted approach (which is used by the composite method to apply...
Evaluating the relative contributions of hydroperiod and soil fertility on growth of south Florida mangroves
K. W. Krauss, T.W. Doyle, R.R. Twilley, V. H. Rivera-Monroy, J.K. Sullivan
2006, Hydrobiologia (569) 311-324
Low and high water periods create contrasting challenges for trees inhabiting periodically flooded wetlands. Low to moderate flood durations and frequencies may bring nutrient subsidies, while greater hydroperiods can be energetically stressful because of oxygen deficiency. We tested the hypothesis that hydroperiod affects the growth of mangrove seedlings and saplings...
Attenuated total reflectance spectroscopy of plant leaves: A tool for ecological and botanical studies
B. Ribeiro da Luz
2006, New Phytologist (172) 305-318
??? Attenuated total reflectance (ATR) spectra of plant leaves display complex absorption features related to organic constituents of leaf surfaces. The spectra can be recorded rapidly, both in the field and in the laboratory, without special sample preparation. ??? This paper explores sources of ATR spectral variation in leaves, including...
Spatial modeling of biological soil crusts to support rangeland assessment and monitoring
M. A. Bowker, J. Belnap, M. E. Miller
2006, Rangeland Ecology and Management (59) 519-529
Biological soil crusts are a diverse soil surface community, prevalent in semiarid regions, which function as ecosystem engineers and perform numerous important ecosystem services. Loss of crusts has been implicated as a factor leading to accelerated soil erosion and other forms of land degradation. To support assessment and monitoring efforts...
Seasonal persistence and population characteristics of Escherichia coli and entercocci in deep backshore sand of two freshwater beaches
M.N. Byappanahalli, R.L. Whitman, D.A. Shively, W.T.E. Ting, C.C. Tseng, M.B. Nevers
2006, Journal of Water and Health (4) 313-320
We studied the shoreward and seasonal distribution of E. coli and enterococci in sand (at the water table) at two southern Lake Michigan beaches—Dunbar and West Beach (in Indiana). Deep, backshore sand (∼20 m inland) was regularly sampled for 15 months during 2002–2003. E. coli counts were not significantly different in samples taken at 5-m...
Influence of deflection on a fold-to-fault progression: field evidence from near Marietta, South Carolina
C.W. Clendenin, J.M. Garihan
2006, Journal of Structural Geology (28) 1316-1326
Four periods of deformation (D1-D4) are recognized in the Lion Park Road borrow pit near Marietta, South Carolina. Although each period is characterized by distinct structures, D3 produced two structural styles (D3a, D3b) resulting from layer-parallel shortening. D3a is characterized by detachment folding at the tip of an underlying thrust....
Diurnal versus nocturnal surveys for California red-legged frogs
G. M. Fellers, P.M. Kleeman
2006, Journal of Wildlife Management (70) 1805-1808
[No abstract available]...
Applications of GIS and database technologies to manage a Karst Feature Database
Y. Gao, R.G. Tipping, E.C. Alexander Jr.
2006, Journal of Cave and Karst Studies (68) 144-152
This paper describes the management of a Karst Feature Database (KFD) in Minnesota. Two sets of applications in both GIS and Database Management System (DBMS) have been developed for the KFD of Minnesota. These applications were used to manage and to enhance the usability of the KFD. Structured Query Language...
The practical use of simplicity in developing ground water models
M. C. Hill
2006, Conference Paper, Ground Water
The advantages of starting with simple models and building complexity slowly can be significant in the development of ground water models. In many circumstances, simpler models are characterized by fewer defined parameters and shorter execution times. In this work, the number of parameters is used as the primary measure of...
Quantity-activity relationship of denitrifying bacteria and environmental scaling in streams of a forested watershed
B.L. O’Connor, Miki Hondzo, D. Dobraca, T.M. LaPara, J.A. Finlay, P.L. Brezonik
2006, Journal of Geophysical Research G: Biogeosciences (111)
The spatial variability of subreach denitrification rates in streams was evaluated with respect to controlling environmental conditions, molecular examination of denitrifying bacteria, and dimensional analysis. Denitrification activities ranged from 0 and 800 ng-N gsed-1 d-1 with large variations observed within short distances (<50 m) along stream reaches. A log-normal probability...
Mercury methylation influenced by areas of past mercury mining in the Terlingua district, Southwest Texas, USA
J. E. Gray, M.E. Hines, H. Biester
2006, Applied Geochemistry (21) 1940-1954
Speciation and microbial transformation of Hg was studied in mine waste from abandoned Hg mines in SW Texas to evaluate the potential for methyl-Hg production and degradation in mine wastes. In mine waste samples, total Hg, ionic Hg2+, Hg0, methyl-Hg, organic C, and total S concentrations were measured, various Hg...
Survival of largemouth bass from populations infected with largemouth bass virus and subjected to simulated tournament conditions
H.L. Schramm Jr., J.G. Davis
2006, North American Journal of Fisheries Management (26) 826-832
Mortality was measured for largemouth bass Micropterus salmoides in simulated tournaments conducted at 26??C to determine whether an easily accomplished live-well management protocol reduced mortality. Treatment fish, which received the live-well management protocol, were held for 8 h in live wells at 23??C with water containing more than 5 mg...
Deep Europe today: Geophysical synthesis of the upper mantle structure and lithospheric processes over 3.5 Ga
I.M. Artemieva, H. Thybo, M.K. Kaban
Gee D.G.Stephenson R.A., editor(s)
2006, Geological Society Memoir 11-41
We present a summary of geophysical models of the subcrustal lithosphere of Europe. This includes the results from seismic (reflection and refraction profiles, P- and S-wave tomography, mantle anisotropy), gravity, thermal, electromagnetic, elastic and petrological studies of the lithospheric mantle. We discuss major tectonic processes as reflected in the lithospheric...
USGS directions in MODFLOW development
P. M. Barlow, A.W. Harbaugh
2006, Conference Paper, Ground Water
[No abstract available]...
Soluble reactive phosphorus (SRP) transport and retention in tropical, rain forest streams draining a volcanic landscape in Costa Rica: In situ SRP amendment to streams and laboratory studies
F. Triska, C. M. Pringle, J.H. Duff, R.J. Avanzino, G. Zellweger
2006, Biogeochemistry (81) 145-157
Soluble reactive phosphorus (SRP) transport/retention was determined in two rain forest streams (Salto, Pantano) draining La Selva Biological Station, Costa Rica. There, SRP levels can be naturally high due to groundwater enriched by geothermal activity within the surfically dormant volcanic landscape, and subsequently discharged at ambient temperature. Combined field and...
Survival and growth of American alligator (Alligator mississippiensis) hatchlings after artificial incubation and repatriation
Y. Temsiripong, A.R. Woodward, J.P. Ross, P.S. Kubilis, H.F. Percival
2006, Journal of Herpetology (40) 415-423
Hatchling American Alligators (Alligator mississippiensis) produced from artificially incubated wild eggs were returned to their natal areas (repatriated). We compared artificially incubated and repatriated hatchlings released within and outside the maternal alligator's home range with naturally incubated hatchlings captured and released within the maternal alligator's home range on Lake Apopka,...
Estimating the abundance of prairie dogs
Dean E. Biggins, John G. Sidle, D.B. Seery, A. E. Ernst
2006, Book chapter, Conservation of the black-tailed prairie dog: saving North America's western grasslands
No abstract available....
Wetland and microhabitat use by nesting four-toed salamanders in Maine
R.J. Chalmers, C.S. Loftin
2006, Journal of Herpetology (40) 478-485
Little is known of Four-Toed Salamander (Hemidactylium scutatum) habitat use, despite the species' extensive range and elevated conservation status. We investigated species-habitat relationships that predict H. scutatum nesting presence in Maine at wetland and microhabitat scales by comparing microhabitats with and without nests. We created logistic regression models, selected models...
Short-term oscillations in avian molt intensity: Evidence from the golden eagle Aquila chrysaetos
D. H. Ellis, J.W. Lish, M. Kery, S.M. Redpath
2006, Journal of Avian Biology (37) 642-644
From a year-long study of molt in the golden eagle Aquila chrysaetos, we recorded 2069 contour feathers replaced in 137 d (6 May-19 September). Very few contour feathers were lost outside this period. From precise daily counts of feathers lost, and using time series analysis, we identified short-term fluctuations (i.e.,...
