Does avian species richness in natural patch mosaics follow the forest fragmentation paradigm?
D.C. Pavlacky Jr., S.H. Anderson
2007, Animal Conservation (10) 57-68
As one approaches the north-eastern limit of pinyon (Pinus spp.) juniper (Juniperus spp.) vegetation on the Colorado Plateau, USA, woodland patches become increasingly disjunct, grading into sagebrush (Artemisia spp.)-dominated landscapes. Patterns of avian species richness in naturally heterogeneous forests may or may not respond to patch discontinuity in the same...
Solar forcing of Gulf of California climate during the past 2000 yr suggested by diatoms and silicoflagellates
John A. Barron, David Bukry
2007, Marine Micropaleontology (62) 115-139
High-resolution records of the past 2000 yr are compared in a north–south transect (28° N to 24° N) of three cores from the eastern slopes of the Guaymas, Carmen, and Pescadero Basins of the Gulf of California (hereafter referred to as the “Gulf”). Evenly-spaced samples from the varved sediments in each...
The impact of floods and storms on the acoustic reflectivity of the inner continental shelf: A modeling assessment
Lincoln F. Pratson, E. W. H. Hutton, A.J. Kettner, J.P.M. Syvitski, P.S. Hill, D.A. George, T.G. Milligan
2007, Continental Shelf Research (27) 542-559
Flood deposition and storm reworking of sediments on the inner shelf can change the mixture of grain sizes on the seabed and thus its porosity, bulk density, bulk compressional velocity and reflectivity. Whether these changes are significant enough to be detectable by...
Glaciers dominate eustatic sea-level rise in the 21st century
Mark Frederick Meier, M.B. Dyurgerov, Ursula K. Rick, William Tad Pfeffer, Suzanne P. Anderson, Andrey F. Glazovsky
2007, Science (317) 1064-1067
Ice loss to the sea currently accounts for virtually all of the sea-level rise that is not attributable to ocean warming, and about 60% of the ice loss is from glaciers and ice caps rather than from the two ice sheets. The contribution of these smaller glaciers has accelerated over...
Sequence analysis of the msp4 gene of Anaplasma ovis strains
J. de la Fuente, M.W. Atkinson, V. Naranjo, I. G. Fernandez de Mera, A.J. Mangold, K.A. Keating, K. M. Kocan
2007, Veterinary Microbiology (119) 375-381
Anaplasma ovis (Rickettsiales: Anaplasmataceae) is a tick-borne pathogen of sheep, goats and wild ruminants. The genetic diversity of A. ovis strains has not been well characterized due to the lack of sequence information. In this study, we evaluated bighorn sheep (Ovis canadensis) and mule deer (Odocoileus hemionus) from Montana for...
Characterizing a December 2005 density current event in the Chicago River, Chicago, Illinois
C.M. Garcia, P.R. Jackson, K. A. Oberg, K. K. Johnson, M.H. Garcia
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
During the winter months, the Chicago River in Chicago, Illinois is subject to bi-directional flows, and density currents are thought to be responsible for these flow variations. This paper presents detailed field measurements using three acoustic Doppler current profiler instruments and simultaneous water-quality measurements made during December 2005. Observations indicate...
Hazards from hydrothermally sealed volcanic conduits
B.W. Christenson, Cynthia A. Werner, A.G. Reyes, S. Sherburn, B.J. Scott, C. Miller, M.J. Rosenburg, A.W. Hurst, K.A. Britten
2007, Eos, Transactions, American Geophysical Union (88) 53-55
The 17 March 2006 eruption from Raoul Island (Kermadec arc, north of New Zealand) is interpreted as a magmatic‐hydrothermal event triggered by shaking associated with a swarm of local earthquakes. The eruption, which tragically claimed the life of New Zealand Department of Conservation Ranger Mark Kearney, occurred...
Weirs: Counting and sampling adult salmonids in streams and rivers
Christian E. Zimmerman, Laura M. Zabkar
2007, Book chapter, Salmonid field protocols handbook: techniques for assessing status and trends in salmon and trout populations.
Weirs—which function as porous barriers built across stream—have long been used to capture migrating fish in flowing waters. For example, the Netsilik peoples of northern Canada used V-shaped weirs constructed of river rocks gathered onsite to capture migrating Arctic char Salvelinus alpinus (Balikci 1970). Similarly, fences constructed of stakes and...
Silurian extension in the Upper Connecticut Valley, United States and the origin of middle Paleozoic basins in the Québec embayment
D.W. Rankin, R.A. Coish, R. D. Tucker, Z.X. Peng, S. A. Wilson, A.A. Rouff
2007, American Journal of Science (307) 216-264
Pre-Silurian strata of the Bronson Hill arch (BHA) in the Upper Connecticut Valley, NH-VT are host to the latest Ludlow Comerford Intrusive Suite consisting, east to west, of a mafic dike swarm with sheeted dikes, and an intrusive complex. The rocks are mostly mafic but with compositions ranging from gabbro...
Response of western mountain ecosystems to climatic variability and change: The Western Mountain Initiative
Nathan L. Stephenson, Dave Peterson, Daniel B. Fagre, Craig D. Allen, Donald McKenzie, Jill Baron, Kelly O’Brian
2007, Mountain Views (1) 4-9
Mountain ecosystems within our national parks and other protected areas provide valuable goods and services such as clean water, biodiversity conservation, and recreational opportunities, but their potential responses to expected climatic changes are inadequately understood. The Western Mountain Initiative (WMI) is a collaboration of scientists whose research focuses on understanding...
The application of satellite differential SAR interferometry-derived ground displacements in hydrogeology
D. L. Galloway, J. Hoffmann
2007, Hydrogeology Journal (15) 133-154
The application of satellite differential synthetic aperture radar (SAR) interferometry, principally coherent (InSAR) and to a lesser extent, persistent-scatterer (PSI) techniques to hydrogeologic studies has improved capabilities to map, monitor, analyze, and simulate groundwater flow, aquifer-system compaction and land subsidence. A number of investigations over the previous decade show how...
The influence of major dams on hydrology through the drainage network of the Sacramento River basin, California
M.B. Singer
2007, River Research and Applications (23) 55-72
This paper reports basinwide patterns of hydrograph alteration via statistical and graphical analysis from a network of long-term streamflow gauges located various distances downstream of major dams and confluences in the Sacramento River basin in California, USA. Streamflow data from 10 gauging stations downstream of major dams were divided into...
USGS national surveys and analysis projects: Preliminary compilation of integrated geological datasets for the United States
Suzanne W. Nicholson, Douglas B. Stoeser, Frederic H. Wilson, Connie L. Dicken, Steve Ludington
2007, Conference Paper
The growth in the use of Geographic nformation Systems (GS) has highlighted the need for regional and national digital geologic maps attributed with age and rock type information. Such spatial data can be conveniently used to generate derivative maps for purposes that include mineral-resource assessment, metallogenic studies, tectonic studies, human...
Preface to the Madison declaration and critical synthesis papers on mercury pollution
James P. Hurley, David P. Krabbenhoft, James G. Wiener, Christopher L. Babiarz
2007, Ambio (36) 2-2
No abstract available....
Controls on the variability of net infiltration to desert sandstone
Victor M. Heilweil, Tim S. McKinney, Michael S. Zhdanov, Dennis E. Watt
2007, Water Resources Research (43)
As populations grow in arid climates and desert bedrock aquifers are increasingly targeted for future development, understanding and quantifying the spatial variability of net infiltration becomes critically important for accurately inventorying water resources and mapping contamination vulnerability. This paper presents a conceptual model of net infiltration to desert sandstone and...
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...
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...
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...
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...
Quantifying the media bias in intensity surveys: Lessons from the 2001 Bhuj, India, earthquake
S. E. Hough, P. Pande
2007, Bulletin of the Seismological Society of America (97) 638-645
Many seismologists have looked at the 26 January 2001 Bhuj earthquake as a key modern calibration event that could be used to improve estimates of magnitudes of large historic mainshocks in stable continental regions. Since no instrumental data are available for important historic events such as the 1819 Allah Bund,...
The chemical response of particle-associated contaminants in aquatic sediments to urbanization in New England, U.S.A.
A.T. Chalmers, P. C. Van Metre, E. Callender
2007, Journal of Contaminant Hydrology (91) 4-25
Relations between urbanization and particle-associated contaminants in New England were evaluated using a combination of samples from sediment cores, streambed sediments, and suspended stream sediments. Concentrations of PAHs, PCBs, DDT, and seven trace metals (Cd, Cr, Cu, Hg, Ni, Pb, Zn) were correlated strongly with urbanization, with the strongest relations...
Ground water stratification and delivery of nitrate to an incised stream under varying flow conditions
John Karl Bohlke, M. E. O’Connell, K.L. Prestegaard
2007, Journal of Environmental Quality (36) 664-680
Ground water processes affecting seasonal variations of surface water nitrate concentrations were investigated in an incised first-order stream in an agricultural watershed with a riparian forest in the coastal plain of Maryland. Aquifer characteristics including sediment stratigraphy, geochemistry, and hydraulic properties were examined in combination with chemical and isotopic analyses...
1400 yr multiproxy record of climate variability from the northern Gulf of Mexico
J.N. Richey, R.Z. Poore, B.P. Flower, T. M. Quinn
2007, Geology (35) 423-426
A continuous decadal-scale resolution record of climate variability over the past 1400 yr in the northern Gulf of Mexico was constructed from a box core recovered in the Pigmy Basin, northern Gulf of Mexico. Proxies include paired analyses of Mg/Ca and δ18O in the white variety of the planktic foraminifer...
Winter behavior and ecology of the Alder Flycatcher (Empidonax alnorum) in Peru
M.S. Foster
2007, Ornitologia Neotropical (18) 171-186
The winter ecology and behavior of Alder Flycatchers (Empidonax alnorum) were studied along the Manu, a white-water meander river in Manu National Park, Madre de Dios, Peru?? during October and November, 1993 to 1997. The birds occupied territories in primary-succession habitats on growing point bars. They were most common in...
Estimation of forest fuel load from radar remote sensing
S. Saatchi, K. Halligan, Don G. Despain, R.L. Crabtree
2007, IEEE Transactions on Geoscience and Remote Sensing (45) 1726-1740
Understanding fire behavior characteristics and planning for fire management require maps showing the distribution of wildfire fuel loads at medium to fine spatial resolution across large landscapes. Radar sensors from airborne or spaceborne platforms have the potential of providing quantitative information about the forest structure and biomass components that can...
