Seasonal climatology of aerosol optical depth over the Indian subcontinent: Trend and departures in recent years
A.K. Prasad, R.P. Singh, A. Singh
2006, International Journal of Remote Sensing (27) 2323-2329
[No abstract available]...
Influence of water flow on Neosho madtom (Noturus placidus) reproductive behavior
J.L. Bryan, M. L. Wildhaber, Douglas B. Noltie
2006, American Midland Naturalist (156) 305-318
The Neosho madtom is a small, short-lived catfish species endemic to gravel bars of the Neosho River in Kansas, Oklahoma and Missouri, U.S.A. It spawns during summer in nesting cavities excavated in gravel. Although the species has survived dam construction within the Neosho River basin, its declining numbers resulted in...
Spatial heterogeneity influences native and nonnative plant species richness
S. Kumar, T.J. Stohlgren, G.W. Chong
2006, Ecology (87) 3186-3199
Effects of permafrost melting on CO2 and CH4 exchange of a poorly drained black spruce lowland
K.P. Wickland, Robert G. Striegl, J. C. Neff, T. Sachs
2006, Journal of Geophysical Research G: Biogeosciences (111)
[1] Permafrost melting is occurring in areas of the boreal forest region where large amounts of carbon (C) are stored in organic soils. We measured soil respiration, net CO2 flux, and net CH4 flux during May–September 2003 and March 2004 in a black spruce lowland in interior Alaska to...
Recent observations of intraspecific predation and cannibalism among polar bears in the southern Beaufort Sea
Steven C. Amstrup, I. Stirling, T. S. Smith, C. Perham, G.W. Thiemann
2006, Polar Biology (29) 997-1002
Intraspecific killing has been reported among polar bears (Ursus maritimus), brown bears (U. arctos), and black bears (U. americanus). Although cannibalism is one motivation for such killings, the ecological factors mediating such events are poorly understood. Between 24 January and 10 April 2004, we confirmed three instances of intraspecific predation...
The global abundance and size distribution of lakes, ponds, and impoundments
J. A. Downing, Y.T. Prairie, J. J. Cole, C.M. Duarte, L.J. Tranvik, Robert G. Striegl, W. H. McDowell, Pirkko Kortelainen, N.F. Caraco, J.M. Melack, J. J. Middelburg
2006, Limnology and Oceanography (51) 2388-2397
One of the major impediments to the integration of lentic ecosystems into global environmental analyses has been fragmentary data on the extent and size distribution of lakes, ponds, and impoundments. We use new data sources, enhanced spatial resolution, and new analytical approaches to provide new estimates of the global abundance...
Changes in organic matter biodegradatility influencing sulfate reduction in an aquifer contaminated by landfill leachate
Steve H. Harris Jr., Jonathan D. Istok, Joseph M. Suflita
2006, Microbial Ecology (51) 535-542
In situ experiments were conducted to measure sulfate reduction rates and identify rate-limiting factors in a shallow, alluvial aquifer contaminated with municipal landfill leachate. Single-well, push–pull tests conducted in a well adjacent to the landfill with >8 mM dissolved organic carbon (DOC) exhibited a sulfate reduction rate of 3.2 μmol...
Monitoring planktivorous seabird populations: Validating surface counts of crevice-nesting auklets using mark-resight techniques
L.M. Sheffield, Adrian E. Gall, D.D. Roby, D.B. Irons, K.M. Dugger
2006, Canadian Journal of Zoology (84) 846-854
Least Auklets (Aethia pusilla (Pallas, 1811)) are the most abundant species of seabird in the Bering Sea and offer a relatively efficient means of monitoring secondary productivity in the marine environment. Counting auklets on surface plots is the primary method used to track changes in numbers of these crevice-nesters, but...
The global lambda visualization facility: An international ultra-high-definition wide-area visualization collaboratory
J. Leigh, L. Renambot, Aaron H. Johnson, B. Jeong, R. Jagodic, N. Schwarz, D. Svistula, R. Singh, J. Aguilera, X. Wang, V. Vishwanath, B. Lopez, D. Sandin, T. Peterka, J. Girado, R. Kooima, J. Ge, L. Long, A. Verlo, T.A. DeFanti, M. Brown, D. Cox, R. Patterson, P. Dorn, P. Wefel, S. Levy, J. Talandis, J. Reitzer, T. Prudhomme, T. Coffin, B. Davis, P. Wielinga, B. Stolk, Koo G. Bum, J. Kim, S. Han, B. Corrie, T. Zimmerman, P. Boulanger, M. Garcia
2006, Future Generation Computer Systems (22) 964-971
The research outlined in this paper marks an initial global cooperative effort between visualization and collaboration researchers to build a persistent virtual visualization facility linked by ultra-high-speed optical networks. The goal is to enable the comprehensive and synergistic research and development of the necessary hardware, software and interaction techniques to...
Establishment of non-native plant species after wildfires: Effects of fuel treatments, abiotic and biotic factors, and post-fire grass seeding treatments
M.E. Hunter, Philip N. Omi, E.J. Martinson, G.W. Chong
2006, International Journal of Wildland Fire (15) 271-281
Establishment and spread of non-native species following wildfires can pose threats to long-term native plant recovery. Factors such as disturbance severity, resource availability, and propagule pressure may influence where non-native species establish in burned areas. In addition, pre- and post-fire management activities may influence the likelihood of non-native species establishment....
High efficiency of meiotic gynogenesis in sea lamprey Petromyzon marinus
J. Rinchard, K. Dabrowski, M. #NAME? Garcia-Abiado
2006, Journal of Experimental Zoology Part B: Molecular and Developmental Evolution (306) 521-527
Induction of androgenesis and gynogenesis by applying a pressure (PS) or heat shock (HS) to double the haploid chromosomal set results in progenies possessing only chromosomes from a single parent. This has never been accomplished in representatives of Agnatha. The objective of this study was to induce gynogenesis and androgenesis...
Insect visitation and pollen deposition in an invaded prairie plant community
D.L. Larson, R.A. Royer, M.R. Royer
2006, Biological Conservation (130) 148-159
Mineral resource of the month: nickel
Peter H. Kuck
2006, Geotimes (2006)
Together with chromium, nickel makes steel more resistant to corrosion. Stainless steel thus accounts for more than 65 percent of primary nickel consumption in the world. One of the more common grades of stainless steel is Type 304, which contains 18 to 20 percent chromium and 10.5 to 12 percent...
Mineral resource of the month: beryllium
Kim B. Shedd
2006, Geotimes (2006)
Beryllium metal is lighter than aluminum and stiffer than steel. These and other properties, including its strength, dimensional stability, thermal properties and reflectivity, make it useful for aerospace and defense applications, such as satellite and space-vehicle structural components. Beryllium’s nuclear properties, combined with its low density, make it useful as...
Drowned coralline algal dominated deposits off Lanai, Hawaii; carbonate accretion and vertical tectonics over the last 30 ka
Jody M. Webster, David A. Clague, Juan Carlos Braga, Heather Spalding, Willem Renema, Christopher Kelley, Bruce Applegate, John R. Smith, Charles K. Paull, James G. Moore, Donald Potts
2006, Marine Geology (225) 223-246
We present detailed bathymetry, remotely operated vehicle (ROV) and submersible observations, and sedimentary and radiocarbon age data from carbonate deposits recovered from two submerged terraces at − 150 m (T1) and − 230 m (T2) off Lanai, Hawaii. The tops of the terraces are veneered by relatively thin (<5 m) in situ...
High severity fire in forests of the southwest: Conservation implications. Progress Report August 2005
Sandra L. Haire
2006, Open-File Report 2006-1077
The occurrence of large, severe fires in southwestern ponderosa pine (Pinus ponderosa) forests has resulted in concern that these forests may not persist under such an extreme disturbance regime. In our research, we are examining the outcomes of high-severity fire in ponderosa pine forests and their neighboring communities across an...
Determination of the δ34S of Total Sulfur in Solids: RSIL Lab Code 1800
Kinga Revesz, Tyler B. Coplen
2006, Techniques and Methods 10-C4
The purpose of Reston Stable Isotope Laboratory Lab (RSIL) Code 1800 is to determine the δ(34S/32S), abbreviated as δ34S, of total sulfur in a solid sample. A Carlo Erba NC 2500 elemental analyzer (EA) is used to convert total sulfur in a solid sample into SO2 gas. The EA is...
Evaluation of evidence supporting the effectiveness of desert tortoise recovery actions
William I. Boarman, William B. Kristan
2006, Scientific Investigations Report 2006-5143
As a federally threatened species, the desert tortoise's (Gopherus agassizii) recovery is required under the Endangered Species Act (ESA). According to the criteria established by the Desert Tortoise Recovery Plan (U.S. Fish and Wildlife Service 1994) for delisting the tortoise from ESA protection, the species as a whole will be considered...
Modeling post-fledging survival of lark buntings in response to ecological and biological factors
A. A. Yackel Adams, S. K. Skagen, J. A. Savidge
2006, Ecology (87) 178-188
We evaluated the influences of several ecological, biological, and methodological factors on post-fledging survival of a shortgrass prairie bird, the Lark Bunting (Calamospiza melanocorys). We estimated daily post-fledging survival (n = 206, 82 broods) using radiotelemetry and color bands to track fledglings. Daily survival probabilities were best explained by...
Assessment of factors limiting Klamath River fall Chinook salmon production potential using historical flows and temperatures
John M. Bartholow, James A. Henriksen
2006, Open-File Report 2006-1249
We parameterized and applied a deterministic salmon production model to infer the degree to which river flows and temperatures may limit freshwater production potential of the Klamath River in California. Specific parameter requirements, data sources, and significant assumptions are discussed in detail. Model simulations covered a wide variety of historical...
Surface waves in the western Taiwan coastal plain from an aftershock of the 1999 Chi-Chi, Taiwan, earthquake
G.-Q. Wang, G.-Q. Tang, D.M. Boore, Burbach G. Van Ness G., C.R. Jackson, X.-Y. Zhou, Q.-L. Lin
2006, Bulletin of the Seismological Society of America (96) 821-845
Significant surface waves were recorded in the western coastal plain (WCP) of Taiwan during the 1999 Chi-Chi, Taiwan, earthquake and its series of aftershocks. We study in detail the surface waves produced by one aftershock (20 September 1999, 18hr 03m 41.16sec, M 6.2) in this paper. We take the Chelungpu-Chukou...
Future trends in transport and fate of diffuse contaminants in catchments, with special emphasis on stable isotope applications
J. Turner, H.-J. Albrechtsen, M. Bonell, J.-P. Duguet, B. Harris, R. Meckenstock, K. McGuire, R. Moussa, N. Peters, H.H. Richnow, B. Sherwood-Lollar, S. Uhlenbrook, Lanen H. van
2006, Hydrological Processes (20) 205-213
A summary is provided of the first of a series of proposed Integrated Science Initiative workshops supported by the UNESCO International Hydrological Programme. The workshop brought together hydrologists, environmental chemists, microbiologists, stable isotope specialists and natural resource managers with the purpose of communicating new ideas on ways to assess microbial...
Differential response in chick survival to diet in least and crested auklets
Adrian E. Gall, D.D. Roby, D.B. Irons, I.C. Rose
2006, Marine Ecology Progress Series (308) 279-291
Least auklets Aethia pusilla and crested auklets A. cristatella are abundant planktivorous seabirds found throughout the Bering Sea and are inextricably linked to the secondary productivity of this northern marine ecosystem. We assessed the relationship between productivity and diet in least and crested auklets by examining breeding chronology, daily survival...
Ecological characteristics of coral patch reefs at Midway Atoll, Northwestern Hawaiian Islands
R.E. Schroeder, J.D. Parrish
2006, Atoll Research Bulletin 439-460
Ecological aspects of coral patch reefs were studied from 1981 to 1985 in Welles Harbor, Midway Atoll. Water temperatures varied from 17??C in February to 28??C in August. Sizes of reefs studied were described by mean area (59 m2), mean volume (52 m3), vertical relief (<1 m), and inter-reef isolation...
SHRIMP study of zircons from Early Archean rocks in the Minnesota River Valley: Implications for the tectonic history of the Superior Province
M. E. Bickford, J. L. Wooden, R. L. Bauer
2006, Geological Society of America Bulletin (118) 94-108
Interest in Paleoarchean to early Mesoarchean crust in North America has been sparked by the recent identification of ca. 3800-3500 Ma rocks on the northern margin of the Superior craton in the Assean Lake region of northern Manitoba and the Porpoise Cove terrane in northern Quebec. It has long been...
