Diet composition of larval and young-of-year shovelnose sturgeon in the Upper Missouri River
P. J. Braaten, D.B. Fuller, N.D. McClenning
2007, Journal of Applied Ichthyology (23) 516-520
Obtaining food following the transition from endogenous to exogenous feeding and during the first year of life is a critical event that strongly influences growth and survival of young-of-year fishes. For shovelnose sturgeon Scaphirhynchus platorynchus, limited information is available on food habits during the first year of life. The objective of...
Effect of catch-and-release angling on growth and survival of rainbow trout, Oncorhynchus mykiss
K.L. Pope, G.R. Wilde, D.W. Knabe
2007, Fisheries Management and Ecology (14) 115-121
Catch-and-release angling is popular in many parts of the world and plays an increasingly important role in fish conservation efforts. Although survival rates associated with catch-and-release angling are well documented for many species, sublethal effects have been less studied. An experiment was conducted to directly assess the effects of catch-and-release...
A five-year analysis of MODIS NDVI and NDWI for grassland drought assessment over the central Great Plains of the United States
Yingxin Gu, Jesslyn F. Brown, J. P. Verdin, B. Wardlow
2007, Geophysical Research Letters (34) 1-6
A five-year (2001–2005) history of moderate resolution imaging spectroradiometer (MODIS) normalized difference vegetation index (NDVI) and normalized difference water index (NDWI) data was analyzed for grassland drought assessment within the central United States, specifically for the Flint Hills of Kansas and Oklahoma. Initial results show strong relationships among NDVI, NDWI,...
Determinants of elephant distribution at Nazinga Game Ranch, Burkina Faso
Jonathan A. Jenks, Robert W. Klaver, Zeno W. Wicks III
2007, Pachyderm (42) 70-80
We used seasonal ground total counts and remote sensing and GIS technology to relate elephant (Loxodonta africana africana) distribution at Nazinga Game Ranch to environmental and anthropogenic factors. Variables used in analyses were normalized difference vegetation index, elevation, stream density, density of poaching and human illegal activities, distance to dams,...
The science, technology and research network (STARNET) a searchable thematic compilation of web resources
W.R. Blados, G.A. Cotter, T. Hermann
2007, Conference Paper, Proceedings of the 3rd International Conference on Recent Advances in Space Technologies, RAST 2007
International alliances in space efforts have resulted in a more rapid diffusion of space technology. This, in turn, increases pressure on organizations to push forward with technological developments and to take steps to maximize their inclusion into the research and development (R&D) process and the overall advancement and enhancement of...
A comparison of macroinvertebrate and habitat methods of data collection in the Little Colorado River Watershed, Arizona 2007
Patrice Spindler, Nick V. Paretti
2007, Open-File Report 10-05
The Arizona Department of Environmental Quality (ADEQ) and the U.S. Environmental Protection Agency (USEPA) Ecological Monitoring and Assessment Program (EMAP), use different field methods for collecting macroinvertebrate samples and habitat data for bioassessment purposes. Arizona’s Biocriteria index was developed using a riffle habitat sampling methodology, whereas the EMAP method employs...
Changes in ice-margin processes and sediment routing during ice-sheet advance across a marginal moraine
P. G. Knight, C.E. Jennings, R. I. Waller, Z. P. Robinson
2007, Geografiska Annaler, Series A: Physical Geography (89) 203-215
Advance of part of the margin of the Greenland ice sheet across a proglacial moraine ridge between 1968 and 2002 caused progressive changes in moraine morphology, basal ice formation, debris release, ice-marginal sediment storage, and sediment transfer to the distal proglacial zone. When the ice margin is behind the moraine,...
The relationship between circulating ecdysteroids and chela allometry in male tanner crabs: Evidence for a terminal molt in the genus Chionoecetes
S.L. Tamone, S. James Taggart, A.G. Andrews, Jennifer Mondragon, J.K. Nielsen
2007, Journal of Crustacean Biology (27) 635-642
Whether male Tanner crabs, Chionoecetes bairdi, undergo a terminal molt associated with a change in claw allometry has long been debated. We measured molting hormone levels in captured male C. bairdi to assess the potential for molting. We plotted a frequency histogram of chela height to carapace width ratios and...
Large-scale scour of the sea floor and the effect of natural armouring processes, land reclamation Maasvlakte 2, port of Rotterdam
S. Boer, E. Elias, S. Aarninkhof, D. Roelvink, T. Vellinga
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
Morphological model computations based on uniform (non-graded) sediment revealed an unrealistically strong scour of the sea floor in the immediate vicinity to the west of Maasvlakte 2. By means of a state-of-the-art graded sediment transport model the effect of natural armouring and sorting of bed material on the scour process...
Nesting habitat relationships of sympatric Crested Caracaras, Red-tailed Hawks, and White-tailed Hawks in South Texas
M.A. Actkinson, W.P. Kuvlesky Jr., C. W. Boal, L.A. Brennan, F. Hernandez
2007, Wilson Journal of Ornithology (119) 570-578
We quantified nesting-site habitats for sympatric White-tailed Hawks (Buteo albicaudatus) (n = 40), Red-tailed Hawks (B. jamaicensis) (n = 39), and Crested Caracaras (Caracara cheriway) (n = 24) in the Coastal Sand Plain of south Texas. White-tailed Hawks and Crested Caracara nest sites occurred in savannas, whereas Red-tailed Hawk nest...
Effect of in ovo exposure to an organochlorine mixture extracted from double crested cormorant eggs (Phalacrocorax auritus) and PCB 126 on immune function of juvenile chickens
E.T. Lavoie, F. Wiley, K.A. Grasman, D. E. Tillitt, J.G. Sikarskie, W.W. Bowerman
2007, Archives of Environmental Contamination and Toxicology (53) 655-661
Organochlorine (OC) contaminants including polychlorinated biphenyls (PCBs) and p, p'-dichlorodiphenyldichloroethylene (DDE) have been associated with immune modulation in wild fish-eating birds from the Great Lakes. The objective of this study was to evaluate the immune function of juvenile chickens after in ovo exposure to PCB 126 or an environmentally relevant...
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...
Kinematic GPS solutions for aircraft trajectories: Identifying and minimizing systematic height errors associated with atmospheric propagation delays
S. Shan, M. Bevis, E. Kendrick, G.L. Mader, D. Raleigh, K. Hudnut, M. Sartori, D. Phillips
2007, Geophysical Research Letters (34)
When kinematic GPS processing software is used to estimate the trajectory of an aircraft, unless the delays imposed on the GPS signals by the atmosphere are either estimated or calibrated via external observations, then vertical height errors of decimeters can occur. This problem is clearly manifested when the aircraft is...
A cold phase of the East Pacific triggers new phytoplankton blooms in San Francisco Bay
James E. Cloern, Alan D. Jassby, Janet K. Thompson, Kathryn Hieb
2007, Proceedings of the National Academy of Sciences of the United States of America (104) 18561-18565
Ecological observations sustained over decades often reveal abrupt changes in biological communities that signal altered ecosystem states. We report a large shift in the biological communities of San Francisco Bay, first detected as increasing phytoplankton biomass and occurrences of new seasonal blooms that began in 1999. This phytoplankton increase is...
Analysis of the sea otter (Enhydra lutris) reproductive tract: A methods manual
Vanessa R. von Biela, Verena A. Gill
2007, Technical Report MMM 2007-002
Reproduction in the female sea otter, Enhydra lutris, was relatively unstudied until Sinha et al. (1966) examined 140 reproductive tracts collected 1955-62 and used their findings to describe sea otter reproductive anatomy and biology. Two years later Sinha and Conaway (1968) published a more detailed paper on the ovary of...
Physical and hormonal examination of Missouri River shovelnose sturgeon reproductive stage: A reference guide
M. L. Wildhaber, D. M. Papoulias, A. J. DeLonay, D. E. Tillitt, J.L. Bryan, M.L. Annis
2007, Journal of Applied Ichthyology (23) 382-401
From May 2001 to June 2002 Wildhaber et al. (2005) conducted monthly sampling of Lower Missouri River shovelnose sturgeon (Scaphirhynchus platorynchus) to develop methods for determination of sex and the reproductive stage of sturgeons in the field. Shovelnose sturgeon were collected from the Missouri River and ultrasonic and endoscopic imagery and...
Mid-Pliocene planktic foraminifer assemblage of the North Atlantic Ocean
H.J. Dowsett, M.M. Robinson
2007, Micropaleontology (53) 105-126
The US Geological Survey Pliocene Research, Interpretation and Synoptic Mapping (PRISM) North Atlantic faunal data set provides a unique, temporally constrained perspective to document and evaluate the quantitative geographic distribution of key mid-Pliocene taxa. Planktic foraminifer census data from within the PRISM time slab (3.29 to 2.97 Ma) at thirteen...
Characterizing hydraulic conductivity with the direct-push permeameter
J.J. Butler Jr., P. Dietrich, V. Wittig, T. Christy
2007, Ground Water (45) 409-419
The direct-push permeameter (DPP) is a promising approach for obtaining high-resolution information about vertical variations in hydraulic conductivity (K) in shallow unconsolidated settings. This small-diameter tool, which consists of a short screened section with a pair of transducers inset in the tool near the screen, is pushed into the subsurface...
The Sonju Lake layered intrusion, northeast Minnesota: Internal structure and emplacement history inferred from magnetic fabrics
S.M. Maes, B. Tikoff, E.C. Ferre, P.E. Brown, J.D. Miller Jr.
2007, Precambrian Research (157) 269-288
The Sonju Lake intrusion (SLI), in northeastern Minnesota, is a layered mafic complex of Keweenawan age (1096.1 ?? 0.8 Ma) related to the Midcontinent rift. The cumulate paragenesis of the intrusion is recognized as broadly similar to the Skaergaard intrusion, a classic example of closed-system differentiation of a tholeiitic mafic...
Reproductive phenologies in a diverse temperate ant fauna
R.R. Dunn, C.R. Parker, M. Geraghty, N.J. Sanders
2007, Ecological Entomology (32) 135-142
1. Ant nuptial flights are central to understanding ant life history and ecology but have been little studied. This study examined the timing of nuptial flights, the synchronicity of nuptial flights (as a potential index of mating strategy), and variation in nuptial flights with elevation and among years in a...
Persistent mortality of brook trout in episodically acidified streams of the Southwestern Adirondack Mountains, New York
Barry P. Baldigo, G. Lawrence, H. Simonin
2007, Transactions of the American Fisheries Society (136) 121-134
Water chemistry, discharge, and mortality of caged brook trout Salvelinus fontinalis were characterized in six headwater streams in the southwestern Adirondack Mountains of New York during spring 2001-2003. Results were compared with mortality recorded during similar tests during 1984-1985, 1988-1990, and 1997 to assess contemporary relations between stream acidification and...
Disruptions of stream sediment size and stability by lakes in mountain watersheds: Potential effects on periphyton biomass
A.K. Myers, A.M. Marcarelli, C.D. Arp, M. A. Baker, W.A. Wurtsbaugh
2007, Journal of the North American Benthological Society (26) 390-400
The location of a stream reach relative to other landforms in a watershed is an important attribute. We hypothesized that lakes disrupt the frequency of finer, more mobile sediments and thereby change sediment transport processes such that benthic substrates are more stable (i.e., less mobile) below lakes than above lakes....
Separation of copper, iron, and zinc from complex aqueous solutions for isotopic measurement
David M. Borrok, Richard B. Wanty, William I. Ridley, Ruth E. Wolf, Paul J. Lamothe, M. Adams
2007, Chemical Geology (242) 400-414
The measurement of Cu, Fe, and Zn isotopes in natural samples may provide valuable information about biogeochemical processes in the environment. However, the widespread application of stable Cu, Fe, and Zn isotope chemistry to natural water systems remains limited by our ability to efficiently separate these trace elements from...
The distribution, occurrence and environmental effect of mercury in Chinese coals
Lingyun Zheng, Gaisheng Liu, C. L. Chou
2007, Science of the Total Environment (384) 374-383
Mercury (Hg) is a toxic, persistent, and globally distributed pollutant due to its characteristic properties such as low melting and boiling points, conversion between chemical forms and participation in biological cycles. During combustion mercury in coal is almost totally emitted to the atmosphere. With a huge amount of coal consumed,...
Mercury and drought along the lower Carson River, Nevada: I. Snowy egret and black-crowned night-heron annual exposure to mercury, 1997-2006
Charles J. Henny, E. F. Hill, R. A. Grove, J. L. Kaiser
2007, Archives of Environmental Contamination and Toxicology (53) 269-280
The dynamic nature of the annual volume of water discharged down the Carson River over a 10-year period, which included a century flood and drought, was examined in order to gain a better understanding of mercury movement, biological availability, and exposure to waterbirds nesting at Lahontan Reservoir. Total annual water...
