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Page 3119, results 77951 - 77975

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Not all publications have extents, not all extents are completely accurate
Relationship of bull fertility to sperm nuclear shape
G.C. Ostermeier, G.A. Sargeant, B.S. Yandell, J.J. Parrish
2001, Journal of Andrology (22) 595-603
The relationship between sperm nuclear shape and bull fertility was determined. Two groups of bulls, 3 per group, were selected. Bulls differed in fertility based on lifetime nonreturn rates. Digital images of propidium iodide-stained sperm from each bull were collected and shape-evaluated by Fourier harmonic amplitudes 0 to 5. A...
Assessing an open-well aquifer test in fractured crystalline rock
C. R. Tiedeman, P. A. Hsieh
2001, Ground Water (39) 68-78
Use of open wells to conduct aquifer tests in fractured crystalline rock aquifers is potentially problematic, because open wells can hydraulically connect highly permeable fracture zones at different depths within the rock. Because of this effect, it is questionable whether estimates of the hydraulic properties of the rock obtained from...
A field and statistical modeling study to estimate irrigation water use at Benchmark Farms study sites in southwestern Georgia, 1995-96
Julia L. Fanning, Gregory E. Schwarz, William C. Lewis
2001, Water-Resources Investigations Report 2000-4292
A benchmark irrigation monitoring network of farms located in a 32-county area in southwestern Georgia was established in 1995 to improve estimates of irrigation water use. A stratified random sample of 500 permitted irrigators was selected from a data base--maintained by the Georgia Department of Natural Resources, Georgia Environmental Protection...
Water quality and occurrence of methyl-tert butyl ether (MTBE) and other fuel related compounds in lakes and ground water at lakeside communities in Sussex and Morris Counties, New Jersey, 1998-1999
Arthur L. Baehr, Timothy J. Reilly
2001, Water-Resources Investigations Report 2001-4149
Densely populated communities surround many of the larger lakes in northwestern New Jersey. These communities derive most of their water supply from wells. The lakes can be navigated by gasoline-powered watercraft, can be in various stages of eutrophication, may contain pathogens associated with bathing and waterfowl, and are periodically subjected...
Earthquake shaking — Finding the "hot spots"
Edward H. Field, Lucile Jones, Tom Jordan, Mark Benthien, Lisa Wald
2001, Fact Sheet 001-01
A new Southern California Earthquake Center study has quantified how local geologic conditions affect the shaking experienced in an earthquake. The important geologic factors at a site are softness of the rock or soil near the surface and thickness of the sediments above hard bedrock. Even when these 'site effects'...
Comparison of methods used to estimate numbers of walruses on sea ice
Mark S. Udevitz, James R. Gilbert, Gennadii A. Fedoseev
2001, Marine Mammal Science (17) 601-616
The US and former USSR conducted joint surveys of Pacific walruses on sea ice and at land haul-outs in 1975, 1980, 1985, and 1990. One of the difficulties in interpreting results of these surveys has been that, except for the 1990 survey, the Americans and Soviets used different methods for...
Late cenozoic fluvial stratigraphy of the New Jersey piedmont: A record of glacioeustasy, planation, and incision on a low-relief passive margin
S.D. Stanford, G.M. Ashley, G.J. Brenner
2001, Journal of Geology (109) 265-276
Late Cenozoic fluvial deposits and erosional landforms in the New Jersey Piedmont record two episodes of valley incision, one in the Late Miocene and one in the Early Pleistocene, separated by periods of planation and fluvial deposition. The upland erosion surface and a fluvial gravel are the remnants of a...
Assessing large-scale surveyor variability in the historic forest data of the original U.S. Public Land Survey
K.L. Manies, D.J. Mladenoff, E.V. Nordheim
2001, Canadian Journal of Forest Research (31) 1719-1730
The U.S. General Land Office Public Land Survey (PLS) records are a valuable resource for studying pre-European settlement vegetation. However, these data were taken for legal, not ecological, purposes. In turn, the instructions the surveyors followed affected the data collected. For this reason, it has been suggested that the PLS...
Seasonal food habits of swift fox (Vulpes velox) in cropland and rangeland landscapes in western Kansas
M.A. Sovada, C.C. Roy, D.J. Telesco
2001, American Midland Naturalist (145) 101-111
Food habits of swift foxes (Vulpes velox) occupying two distinct landscapes (dominated by cropland versus rangeland) in western Kansas were determined by analysis of scats collected in 1993 and 1996. Frequencies of occurrence of prey items in scats were compared between cropland and rangeland areas by season. Overall, the most...
Monitoring the effect of poplar trees on petroleum-hydrocarbon and chlorinated-solvent contaminated ground water
James Landmeyer
2001, International Journal of Phytoremediation (3) 61-85
At contaminated groundwater sites, poplar trees can be used to affect ground-water levels, flow directions, and ultimately total groundwater and contaminant flux to areas downgradient of the trees. The magnitude of the hydrologic changes can be monitored using fundamental concepts of groundwater hydrology, in addition to plant physiology-based approaches, and...
Florida manatees: Perspectives on populations, pain, and protection
Thomas J. O’Shea, Lynn W. Lefebvre, Cathy A. Beck
Leslie A. Dierauf, Frances M. D. Gulland, editor(s)
2001, Book chapter, Handbook of marine mammal Medicine: Health, disease, and rehabilitation
This overview has three related objectives. First, it provides simple documentation, descriptive summaries, and anecdotal accounts that demonstrate the extent to which maiming, and likely pain and suffering, occur in wild manatees as a result of strikes by boats. The chapter calls attention to the issues wounding raises for policy...
Breeding bird response to juniper woodland expansion
Steven S. Rosenstock, Charles van Riper III
2001, Journal of Range Management (54) 226-232
In recent times, pinyon (Pinus spp.)-juniper (Juniperus spp.) woodlands have expanded into large portions of the Southwest historically occupied by grassland vegetation. From 1997-1998, we studied responses of breeding birds to one-seed juniper (J. monosperma) woodland expansion at 2 grassland study areas in northern Arizona. We sampled breeding birds in...
Organochlorine contaminants and biomarker response in double-crested cormorants nesting in Green Bay and Lake Michigan, Wisconsin, USA
T. W. Custer, Christine M. Custer, R. K. Hines, K. L. Stromborg, P. David Allen, M. J. Melancon, D.S. Henshel
2001, Archives of Environmental Contamination and Toxicology (40) 89-100
Double-crested cormorant (Phalacrocorax auritus) eggs at pipping and sibling 10-day-old chicks were collected from two colonies in Green Bay, WI, one colony in Lake Michigan, WI, and reference colonies in South Dakota and Minnesota. Egg contents and chicks were analyzed for organochlorine contaminants including polychlorinated biphenyl (PCB) congeners....