Prioritizing bottomland hardwood forest sites for protection and augmentation
J. Carter, J. Biagas
2007, Natural Areas Journal (27) 72-82
Bottomland hardwood forest has been greatly diminished by conversion to agriculture. Less than 25% of the pre-Columbian bottomland hardwood forests remain in the southeastern United States. Because of the valuable ecological and hydrological functions performed by these forests, their conservation and restoration has been a high priority. Part of these...
Effects of river discharge on abundance and instantaneous growth of age-0 carpsuckers in the Oconee River, Georgia, USA
Ronald C. Peterson, Cecil A. Jennings
2007, River Research and Applications (23) 1016-1025
The Oconee River in middle Georgia, U.S.A., has been regulated by the Sinclair Dam since 1953. Since then, the habitat of the lower Oconee River has been altered and the river has become more incised. The altered environmental conditions of the Oconee River may limit the success of various fish...
Incorporating availability for detection in estimates of bird abundance
Duane R. Diefenbach, M.R. Marshall, J.A. Mattice, D.W. Brauning
2007, The Auk (124) 96-106
Several bird-survey methods have been proposed that provide an estimated detection probability so that bird-count statistics can be used to estimate bird abundance. However, some of these estimators adjust counts of birds observed by the probability that a bird is detected and assume that all birds are available to be...
Warming may create substantial water supply shortages in the Colorado River basin
G.J. McCabe, D.M. Wolock
2007, Geophysical Research Letters (34)
The high demand for water, the recent multiyear drought (1999-2007), and projections of global warming have raised questions about the long-term sustainability of water supply in the southwestern United States. In this study, the potential effects of specific levels of atmospheric warming on water-year streamflow in the Colorado River basin...
Surface drifter derived circulation in the northern and middle Adriatic Sea: Response to wind regime and season
L. Ursella, P.-M. Poulain, R. P. Signell
2007, Journal of Geophysical Research C: Oceans (112)
More than 120 satellite-tracked drifters were deployed in the northern and middle Adriatic (NMA) Sea between September 2002 and November 2003, with the purpose of studying the surface circulation at mesoscale to seasonal scale in relation to wind forcing, river runoff, and bottom topography. Pseudo-Eulerian and Lagrangian statistics were calculated...
Modelingevapotranspirationina sub-tropical climate
M.R. Savabi, T.A. Cochrane, E. German, C. Ikiz, N. Cockshutt
2007, Journal of Environmental Hydrology (15) 1-15
Evapotranspiration (ET) loss is estimated at about 80-85% of annual precipitation in South Florida. Accurate prediction of ET is important during and beyond the implementation of the Comprehensive Everglades Restoration Plan (CERP). In the USDA's Everglades Agro-Hydrology Model (EAHM) the soil water intake is linked with the soil water redistribution,...
Assessments of habitat preferences and quality depend on spatial scale and metrics of fitness
A.D. Chalfoun, T. E. Martin
2007, Journal of Applied Ecology (44) 983-992
1. Identifying the habitat features that influence habitat selection and enhance fitness is critical for effective management. Ecological theory predicts that habitat choices should be adaptive, such that fitness is enhanced in preferred habitats. However, studies often report mismatches between habitat preferences and fitness consequences across a wide variety of...
Use of a watershed model to characterize the fate and transport of fluometuron, a soil-applied cotton herbicide, in surface water
R.H. Coupe
2007, International Journal of Environmental Analytical Chemistry (87) 883-896
The Soil and Water Assessment Tool (SWAT) was used to characterize the fate and transport of fluometuron (a herbicide used on cotton) in the Bogue Phalia Basin in northwestern Mississippi, USA. SWAT is a basin-scale watershed model, able to simulate hydrological, chemical, and sediment transport processes. After adjustments to a...
Recent records of alien anurans on the Pacific Island of Guam
M.T. Christy, C.S. Clark, D.E. Gee II, D. Vice, D.S. Vice, M.P. Warner, C.L. Tyrrell, G.H. Rodda, J. A. Savidge
2007, Pacific Science (61) 469-483
Eight anuran species were recorded for the first time in Guam in the period May 2003-December 2005, all apparently the result of arrivals to the island since 2000. Three of the eight species (Rana guentheri, Polypedates megacephalus, and Eleutherodactylus planirostris) had well-established breeding populations by 2005. A further three (Fejevarya...
Danger lurks deep: The human impact of volcanoes
J. Feldman, Robert I. Tilling
2007, Geotimes (52) 30-35
Near midnight of March 28, 1982, El Chichón — an obscure, little-studied volcano in Chiapas State, southern Mexico — violently erupted, terrifying local villagers and prompting a confused, poorly executed evacuation. For the next five days, the volcano remained intermittently but only weakly active, so many evacuees were allowed to...
Seismic amplification within the Seattle Basin, Washington State: Insights from SHIPS seismic tomography experiments
C.M. Snelson, T.M. Brocher, K.C. Miller, T. L. Pratt, A.M. Trehu
2007, Bulletin of the Seismological Society of America (97) 1432-1448
Recent observations indicate that the Seattle sedimentary basin, underlying Seattle and other urban centers in the Puget Lowland, Washington, amplifies long-period (1-5 sec) weak ground motions by factors of 10 or more. We computed east-trending P- and S-wave velocity models across the Seattle basin from Seismic Hazard Investigations of Puget...
Generation and propagation of nonlinear internal waves in Massachusetts Bay
A. Scotti, R.C. Beardsley, B. Butman
2007, Journal of Geophysical Research C: Oceans (112)
During the summer, nonlinear internal waves (NLIWs) are commonly observed propagating in Massachusetts Bay. The topography of the area is unique in the sense that the generation area (over Stellwagen Bank) is only 25 km away from the shoaling area, and thus it represents an excellent natural laboratory to study...
History of the shortjaw cisco (Coregonus zenithicus) in Lake Superior, 1895-2003
O. T. Gorman, T. N. Todd
Jankun M.Brzuzan P.Hliwa P.Luczynski M., editor(s)
2007, Book chapter, Biology and Management of Coregonid Fishes
No abstract available....
Crossing disciplines and scales to understand the critical zone
S.L. Brantley, M. B. Goldhaber, Ragnarsdottir K. Vala
2007, Elements (3) 307-314
The Critical Zone (CZ) is the system of coupled chemical, biological, physical, and geological processes operating together to support life at the Earth's surface. While our understanding of this zone has increased over the last hundred years, further advance requires scientists to cross disciplines and scales to integrate understanding of...
Methane-derived authigenic carbonates from the northern Gulf of Mexico - MD02 Cruise
Y. Chen, R. Matsumoto, C. K. Paull, W. Ussler III, T. Lorenson, P. Hart, W. Winters
2007, Journal of Geochemical Exploration (95) 1-15
Authigenic carbonates were sampled in piston cores collected from both the Tunica Mound and the Mississippi Canyon area on the continental slope of the northern Gulf of Mexico during a Marion Dufresne cruise in July 2002. The carbonates are present as hardgrounds, porous crusts, concretions or nodules and shell fragments with or...
Geochemistry of natural components in the near-field environment, Yucca Mountain, Nevada
Z. E. Peterman, T.A. Oliver
2007, Conference Paper, Materials Research Society Symposium Proceedings
The natural near-field environment in and around the emplacement drifts of the proposed nuclear waste repository at Yucca Mountain, Nevada, includes the host rock, dust, seepage, and pore water. The chemical compositions of these components have been determined for assessing possible chemical and mineralogical reactions that may occur after nuclear...
The reality of reserve growth
Mahendra K. Verma
2007, GEO ExPro (4) 34-35
No abstract available....
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...
Ground-penetrating radar: A tool for monitoring bridge scour
N.L. Anderson, A.M. Ismael, T. Thitimakorn
2007, Environmental & Engineering Geoscience (13) 1-10
Ground-penetrating radar (GPR) data were acquired across shallow streams and/or drainage ditches at 10 bridge sites in Missouri by maneuvering the antennae across the surface of the water and riverbank from the bridge deck, manually or by boat. The acquired two-dimensional and three-dimensional data sets accurately image the channel bottom,...
Possible refugia in the Alexander Archipelago of southeastern Alaska during the late Wisconsin glaciation
P. E. Carrara, T. A. Ager, J.F. Baichtal
2007, Canadian Journal of Earth Sciences (44) 229-244
The interpretation of the extent of late Wisconsin glaciation in southeastern Alaska has varied between geologists and biologists. Maps and reports of the region prepared by geologists commonly indicated that late Wisconsin ice extended as a large uniform front west to the edge of the continental shelf. However, the distribution...
Soil nutrients influence spatial distributions of tropical trees species
R. John, J.W. Dalling, K.E. Harms, J.B. Yavitt, R.F. Stallard, M. Mirabello, S.P. Hubbell, R. Valencia, H. Navarrete, M. Vallejo, R.B. Foster
2007, Proceedings of the National Academy of Sciences of the United States of America (104) 864-869
The importance of niche vs. neutral assembly mechanisms in structuring tropical tree communities remains an important unsettled question in community ecology [Bell G (2005) Ecology 86:1757-1770]. There is ample evidence that species distributions are determined by soils and habitat factors at landscape (<104 km2) and regional scales. At local scales...
An efficient mode-splitting method for a curvilinear nearshore circulation model
Fengyan Shi, James T. Kirby, Daniel M. Hanes
2007, Coastal Engineering (54) 811-824
A mode-splitting method is applied to the quasi-3D nearshore circulation equations in generalized curvilinear coordinates. The gravity wave mode and the vorticity wave mode of the equations are derived using the two-step projection method. Using an implicit algorithm for the gravity mode and an explicit algorithm for the vorticity mode,...
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...
Possible use of foresight, understanding, and planning by wolves hunting muskoxen
L. David Mech
2007, Arctic (60) 145-149
On Ellesmere Island in 2006, arctic wolves (Canis lupus arctos) were observed making a two-pronged approach to a herd of muskoxen (Ovibos moschatus) and, on another occasion, ambushing muskoxen. Both observations seemed to provide evidence that the wolves were using foresight, understanding, and planning. Although the possible use of insight...
Monitoring and modeling ice-rock avalanches from ice-capped volcanoes: A case study of frequent large avalanches on Iliamna Volcano, Alaska
C. Huggel, J. Caplan-Auerbach, C. F. Waythomas, R.L. Wessels
2007, Journal of Volcanology and Geothermal Research (168) 114-136
Iliamna is an andesitic stratovolcano of the Aleutian arc with regular gas and steam emissions and mantled by several large glaciers. Iliamna Volcano exhibits an unusual combination of frequent and large ice-rock avalanches in the order of 1 ?? 106??m3 to 3 ?? 107??m3 with recent return periods of 2-4??years....
