Flow resistance dynamics in step‐pool channels: 2. Partitioning between grain, spill, and woody debris resistance
Andrew C. Wilcox, Jonathan M. Nelson, Ellen E. Wohl
2006, Water Resources Research (42)
In step‐pool stream channels, flow resistance is created primarily by bed sediments, spill over step‐pool bed forms, and large woody debris (LWD). In order to measure resistance partitioning between grains, steps, and LWD in step‐pool channels we completed laboratory flume runs in which total resistance was measured with and without...
Source apportionment modeling of volatile organic compounds in streams
J. F. Pankow, W.E. Asher, J.S. Zogorski
2006, Environmental Toxicology and Chemistry (25) 921-932
It often is of interest to understand the relative importance of the different sources contributing to the concentration cw of a contaminant in a stream; the portions related to sources 1, 2, 3, etc. are denoted cw,1, cw,2, cw,3, etc. Like c w, 'he fractions ??1, = cw,1/c w, ??2...
Effects of ascorbic acid enrichment by immersion of rainbow trout (Oncorhynchus mykiss, Walbaum 1792) eggs and embryos
B. Falahatkar, K. Dabrowski, M. Arslan, J. Rinchard
2006, Aquaculture Research (37) 834-841
This study was conducted to examine the effects of different forms and concentrations of ascorbic acid (vitamin C), and different enrichment times (24 and 48 h post ovulation) on egg, embryo and alevin ascorbate concentrations and survival of rainbow trout (enrichment was at the ova stage). In experiments 1 and...
Temporal-spatial distribution of American bison (Bison bison) in a tallgrass prairie fire mosaic
K.L. Schuler, David M. Leslie Jr., J.H. Shaw, E.J. Maichak
2006, Journal of Mammalogy (87) 539-544
Fire and bison (Bison bison) are thought to be historically responsible for shaping prairie vegetation in North America. Interactions between temporal-spatial distributions of bison and prescribed burning protocols are important in current restoration of tallgrass prairies. We examined dynamics of bison distribution in a patch-burned tallgrass prairie in the south-central...
Henslow's sparrow winter-survival estimates and response to prescribed burning
B.S. Thatcher, D.G. Krementz, M.S. Woodrey
2006, Journal of Wildlife Management (70) 198-206
Wintering Henslow's sparrow (Ammodramus henslowii) populations rely on lands managed with prescribed burning, but the effects of various burn regimes on their overwinter survival are unknown. We studied wintering Henslow's sparrows in coastal pine savannas at the Mississippi Sandhill Crane National Wildlife Refuge, Jackson County, Mississippi, USA, during January and...
Pulley reef: a deep photosynthetic coral reef on the West Florida Shelf, USA
J.K. Culter, K.B. Ritchie, S.A. Earle, D.E. Guggenheim, R. B. Halley, K.T. Ciembronowicz, A. C. Hine, B. D. Jarrett, S. D. Locker, W.C. Jaap
2006, Coral Reefs (25) 228-228
Pulley Reef (24°50′N, 83°40′W) lies on a submerged late Pleistocene shoreline feature that formed during a sea-level stillstand from 13.8 to 14.5 ka (Jarrett et al. 2005). The reef is currently 60–75 m deep, exhibits 10–60% coral cover, and extends over approximately 160 km2 of the sea floor. Zooxanthellate corals...
Forest reproduction along a climatic gradient in the Sierra Nevada, California
Phillip J. van Mantgem, Nathan L. Stephenson, Jon E. Keeley
2006, Forest Ecology and Management (225) 391-399
To elucidate broad-scale environmental controls of coniferous forest reproduction in the Sierra Nevada, California, we monitored reproduction for 5 years in 47 plots arrayed across a steep elevational (climatic) gradient. We found that both absolute seedling densities (stems < 1.37 m) and seedling densities relative to overstory parent tree basal area declined sharply...
The Cretaceous Tetori biota in Japan and its evolutionary significance for terrestrial ecosystems in Asia
M. Matsukawa, M. Ito, N. Nishida, K. Koarai, M.G. Lockley, D. J. Nichols
2006, Cretaceous Research (27) 199-225
Cretaceous nonmarine deposits are widely distributed on the Asian continent and include various kinds of zoo- and phyto-assemblages. The Tetori Group is one of the most important Mesozoic terrestrial deposits in East Asia, and for this reason its geology, stratigraphy, and biota have been studied intensively by our group for...
Fat dynamics of arctic-nesting sandpipers during spring in mid-continental North America
Gary L. Krapu, J.L. Eldridge, C. L. Gratto-Trevor, D. A. Buhl
2006, The Auk (123) 323-334
We measured fresh body mass, total body fat, and fat-free dry mass (FFDM) of three species of Arctic-nesting calidrid sandpipers (Baird's Sandpiper [Calidris bairdii], hereafter “BASA”; Semipalmated Sandpiper [C. pusilla], hereafter “SESA”; and White-rumped Sandpiper [C. fuscicollis], hereafter “WRSA”) during spring stopovers in the Prairie Pothole Region (PPR) of North...
Thinking about feathers: Adaptations of Golden Eagle rectrices
D. H. Ellis, J.W. Lish
2006, Journal of Raptor Research (40) 1-28
The striking black and white plumage of the juvenile Golden Eagle (Aquila chrysaetos) provides an excellent opportunity to examine the possible selective forces influencing the strategic placement of dark pigment in birds. The conflict between opposing selective pressures (first, toward large white patches, which may allay aggression in adults, and...
Real-time monitoring and massive inversion of source parameters of very long period seismic signals: An application to Stromboli Volcano, Italy
E. Auger, L. D’Auria, M. Martini, B. Chouet, P. Dawson
2006, Geophysical Research Letters (33)
We present a comprehensive processing tool for the real‐time analysis of the source mechanism of very long period (VLP) seismic data based on waveform inversions performed in the frequency domain for a point source. A search for the source providing the best‐fitting solution is conducted over a three‐dimensional grid of...
Large rock avalanches triggered by the M 7.9 Denali Fault, Alaska, earthquake of 3 November 2002
R.W. Jibson, E. L. Harp, W. Schulz, D. K. Keefer
2006, Engineering Geology (83) 144-160
The moment magnitude (M) 7.9 Denali Fault, Alaska, earthquake of 3 November 2002 triggered thousands of landslides, primarily rock falls and rock slides, that ranged in volume from rock falls of a few cubic meters to rock avalanches having volumes as great as 20 ?? 106 m3. The pattern of...
Effect of diet processing method and ingredient substitution on feed characteristics and survival of larval walleye, Sander vitreus
F.T. Barrows, W.A. Lellis
2006, Journal of the World Aquaculture Society (37) 154-160
Two methods were developed for the production of larval fish diets. The first method, microextrusion marumerization (MEM), has been tested in laboratory feeding trials for many years and produces particles that are palatable and water stable. The second method, particle-assisted rotational agglomeration (PARA), produced diets that have lower density than...
Prolactin and growth hormone in fish osmoregulation
T. Sakamoto, S. D. McCormick
2006, General and Comparative Endocrinology (147) 24-30
Prolactin is an important regulator of multiple biological functions in vertebrates, and has been viewed as essential to ion uptake as well as reduction in ion and water permeability of osmoregulatory surfaces in freshwater and euryhaline fish. Prolactin-releasing peptide seems to stimulate prolactin expression in the pituitary and peripheral organs...
Ontogenetic dynamics of mercury accumulation in Northwest Atlantic sea lamprey (Petromyzon marinus)
P.E. Drevnick, M.J. Horgan, J.T. Oris, B.E. Kynard
2006, Canadian Journal of Fisheries and Aquatic Sciences (63) 1058-1066
We examined the ontogenetic dynamics of mercury accumulation in sea lamprey (Petromyzon marinus) from the Connecticut River, USA. Mercury concentrations in eggs (mean 84 ng??g-1 wet weight) were lowest of all life stages and correlated to concentrations in females. There was a higher rate of maternal transfer of mercury to...
Basic concepts for the linear model of ground water level recession
A. T. Rutledge
2006, Ground Water (44) 483-487
Basic concepts are illustrated for the display of ground water level recession as a linear plot on a semilog graph, as first described by Rorabaugh. This exponential decay function can be achieved if there is a definable outflow boundary such as a lake or river and if water levels are...
Thermodynamic calculations in the system CH4-H2O and methane hydrate phase equilibria
S. Circone, S. H. Kirby, L.A. Stern
2006, Journal of Physical Chemistry B (110) 8232-8239
Using the Gibbs function of reaction, equilibrium pressure, temperature conditions for the formation of methane clathrate hydrate have been calculated from the thermodynamic properties of phases in the system CH4-H 2O. The thermodynamic model accurately reproduces the published phase-equilibria data to within ??2 K of the observed equilibrium boundaries in...
Patterns of fish use and piscivore abundance within a reconnected saltmarsh impoundment in the northern Indian River Lagoon, Florida
Philip W. Stevens, C.L. Montague, K. J. Sulak
2006, Wetlands Ecology and Management (14) 147-166
Nearly all saltmarshes in east-central, Florida were impounded for mosquito control during the 1960s. The majority of these marshes have since been reconnected to the estuary by culverts, providing an opportunity to effectively measure exchange of aquatic organisms. A multi-gear approach was used monthly to simultaneously estimate fish standing stock...
Sustained long-period seismicity at Shishaldin Volcano, Alaska
Tanja Petersen, Jacqueline Caplan-Auerbach, Stephen R. McNutt
2006, Journal of Volcanology and Geothermal Research (151) 365-381
From September 1999 through April 2004, Shishaldin Volcano, Aleutian Islands, Alaska, exhibited a continuous and extremely high level of background seismicity. This activity consisted of many hundreds to thousands of long-period (LP; 1–2 Hz) earthquakes per day, recorded by a 6-station monitoring network around Shishaldin. The LP events originate beneath...
A Lower Carboniferous two-stage extensional basin along the Avalon-Meguma terrane boundary: Evidence from southeastern Isle Madame, Nova Scotia
Eric R. Force, S. M. Barr
2006, Atlantic Geology (42) 53-68
Anomalously thick and coarse clastic sedimentary successions, including over 5000 m of conglomerate, are exposed on Isle Madame off the southern coast of Cape Breton island. Two steeply to moderately dipping stratigraphic packages are recognized: one involving Horton and lower Windsor groups (Tournasian–Visean); the other involving upper Windsor and Mabou...
Landslides triggered by the 2004 Niigata Ken Chuetsu, Japan, earthquake
D.S. Kieffer, R. Jibson, E.M. Rathje, K. Kelson
2006, Earthquake Spectra (22)
The Niigata Ken Chuetsu earthquake triggered a vast number of lanslides in the epicentral region. Landslide concentrations were among the highest ever measured after an earthquake, and most of the triggered landslides were relatively shallow failures parallel to the steep slope faces. The dense concentration of landslides can be attributed...
Factors determining Pochard nest predation along a wetland gradient
T. Albrecht, D. Horak, J. Kreisinger, K. Weidinger, P. Klvana, T.C. Michot
2006, Journal of Wildlife Management (70) 784-791
Waterfowl management on breeding grounds focuses on improving nest success, but few studies have compared waterfowl nest success and factors affecting nest survival along a wetland gradient and simultaneously identified nest predators. We monitored nests (n = 195) of common pochards (Aythya ferina) in Trebon Basin Biosphere Reserve, Czech...
Population momentum: Implications for wildlife management
D. N. Koons, R.F. Rockwell, J.B. Grand
2006, Journal of Wildlife Management (70) 19-26
Maintenance of sustainable wildlife populations is one of the primary purposes of wildlife management. Thus, it is important to monitor and manage population growth over time. Sensitivity analysis of the long-term (i.e., asymptotic) population growth rate to changes in the vital rates is commonly used in management to identify the...
Simple equations guide high-frequency surface-wave investigation techniques
J. Xia, Y. Xu, C. Chen, R.D. Kaufmann, Y. Luo
2006, Soil Dynamics and Earthquake Engineering (26) 395-403
We discuss five useful equations related to high-frequency surface-wave techniques and their implications in practice. These equations are theoretical results from published literature regarding source selection, data-acquisition parameters, resolution of a dispersion curve image in the frequency-velocity domain, and the cut-off frequency of high modes. The first equation suggests Rayleigh...
Using diatom assemblages to assess urban stream conditions
C. E. Walker, Y. Pan
2006, Hydrobiologia (561) 179-189
We characterized changes in diatom assemblages along an urban-to-rural gradient to assess impacts of urbanization on stream conditions. Diatoms, water chemistry, and physical variables of riffles at 19 urban and 28 rural stream sites were sampled and assessed during the summer base flow period. Near stream land use was characterized...
