Determination of selection gradients using multiple regression versus Structural Equation Modeling (SEM)
B.H. Pugesek, A. Tomer
1995, Biometrical Journal (37) 449-462
Selection studies involving multiple intercorrelated independent variables have employed multiple regression analysis as a means to estimate and partition natural and sexual selection's direct and indirect effects. These statistical models assume that independent variables are measured without error. Most would conclude that such is not the case in the field...
Disarticulation of turtle shells in north-central Florida: How long does a shell remain in the woods?
C.K. Dodd Jr.
1995, American Midland Naturalist (134) 378-387
From 1985 through 1991, I examined and categorized the sequential shell disarticulation patterns of 80 turtle specimens, representing six species and three families, in N-central Florida. Shells were allowed to disarticulate on land under natural environmental conditions. Turtle shells were observed from 5-54 mo. Based on examinations of photos, nine...
The role of palynology in paleoecological analyses of Tertiary coals
D. J. Nichols
1995, International Journal of Coal Geology (28) 139-159
Pollen, spores, and other plant microfossils are important constituents of Tertiary coals, both as petrographic components (the maceral sporinite) and as distinctive indicators of the nature of the depositional environment in which the coal-forming peat accumulated. Palynological analyses, which have been...
Pattern of shoreline spawning by sockeye salmon in a glacially turbid lake: Evidence for subpopulation differentiation
C. V. Burger, J.E. Finn, L. Holland-Bartels
1995, Transactions of the American Fisheries Society (124) 1-15
Alaskan sockeye salmon Oncorhynchus nerka typically spawn in lake tributaries during summer (early run) and along clear‐water lake shorelines and outlet rivers during fall (late run). Production at the glacially turbid Tustumena Lake and its outlet, the Kasilof River (south‐central Alaska), was thought to be limited to a single...
Adjusting stream-sediment geochemical maps in the Austrian Bohemian Massif by analysis of variance
J.C. Davis, G. Hausberger, O. Schermann, G. Bohling
1995, Mathematical Geology (27) 279-299
The Austrian portion of the Bohemian Massif is a Precambrian terrane composed mostly of highly metamorphosed rocks intruded by a series of granitoids that are petrographically similar. Rocks are exposed poorly and the subtle variations in rock type are difficult to map in the field. A detailed geochemical survey of...
Undiscovered petroleum of the Brazilian interior sag basins
J. Kingston, J.R. Matzko
1995, International Geology Review (37) 959-980
This paper, the second in a series dealing with undiscovered petroleum in South American basins (exclusive of Venezuela and Colombia), focuses on the four large intracratonic (or interior) sag basins of Brazil: the Solimoes, Amazonas, Parnaiba, and Parana. The smaller Chaco basin also is discussed, although in...
Wind damage effects of Hurricane Andrew on mangrove communities along the southwest coast of Florida, USA
T.W. Doyle, T. J. Smith III, M. B. Robblee
1995, Journal of Coastal Research 159-168
On August 24, 1992, Hurricane Andrew downed and defoliated an extensive swath of mangrove trees across the lower Florida peninsula. Permanent field sites were established to assess the extent of forest damage and to monitor the rate and process of forest recovery. Canopy trees suffered the highest mortality particularly for...
Size-dependent, sex-dependent and seasonal changes in insulin-lige growth-factor-I in the loggerhead sea turtle
D.A. Crain, A.B. Bolten, K.A. Bjorndal, L. J. Guillette, T. S. Gross
1995, General and Comparative Endocrinology (98) 219-226
This study examines size-dependent, sex-dependent, and seasonal fluctuations in plasma insulin-like growth factor-I (IGF-I) concentrations in loggerhead sea turtles (Caretta caretta). Loggerhead turtles (n = 158) were captured in shrimp trawler nets during a 12-month survey in Cape Canaveral Channel, Florida. Plasma samples were analyzed using a validated heterologous radioimmunoassay. Large...
Simplified method for estimating total streambed scour at bridges in Illinois
Robert R. Holmes Jr., Daniel G. Ghere, Chad J. Dunn
Espey William H.Combs Phil G., editor(s)
1995, Conference Paper, International Water Resources Engineering Conference - Proceedings
A simplified method to estimate total streambed scour was developed for application to approximately 10,000 Local Agency bridges (bridges owned by local governments and not by the State of Illinois). This method consists of using total scour-envelope curves, developed as empirical relations between calculated total scour and bridge characteristics for...
Occurrence of active and inactive herbicide ingredients at selected sites in Iowa
W. Wang, M. Liszewski, R. Buchmiller, K. Cherryholmes
1995, Water, Air, & Soil Pollution (83) 21-35
The objective of this study was to investigate the occurrence of herbicide active and inactive ingredients (primarily volatile organic compounds) at four selected sites in Iowa representing drain tiles, observation wells, or lysimeters. Water samples were collected monthly and bi-monthly before and after herbicide applications in 1991, respectively. They...
Detection and identification of aquatic birnaviruses by PCR assay
S.L. Blake, W. B. Schill, P. E. McAllister, M.K. Lee, J.T. Singer, B.L. Nicholson
1995, Journal of Clinical Microbiology (33) 835-839
A reverse transcriptase polymerase chain reaction (RT-PCR) assay was developed for the detection and identification of aquatic birnaviruses. The four sets of primers (PrA, PrB, PrC, and PrD) that we used are specific for regions of cDNA coded by genome segment A of aquatic birnaviruses. PrA identifies a large fragment...
Some tests of the "migration hypothesis" for anadromous Dolly Varden (southern form)
David R. Bernard, Kelley R. Hepler, J. Douglas Jones, Mary E. Whalen, Douglas N. McBride
1995, Transactions of the American Fisheries Society (124) 297-307
Some aspects of a previously described migratory paradigm for the southern form of anadromous Dolly Varden Salvelinus malma were investigated with seven 3‐year mark–recapture experiments on fish that used lakes in eight watersheds as their winter residence. Weirs on Kodiak Island, around Prince William Sound, and near Juneau, Alaska, were used to...
Magnitude and frequency of peak discharges for Mississippi River Basin Flood of 1993
W.O. Thomas Jr., D. A. Eash
1995, Transportation Research Record 1-10
The magnitude and frequency of the 1993 peak discharges in the upper Mississippi River Basin are characterized by applying Bulletin 17B and L-moment methods to annual peak discharges at 115 unregulated watersheds in the basin. The analysis indicated that the 1993 flood was primarily a 50-year or less event on...
Large wave at Daytona Beach, Florida, explained as a squall-line surge
A. H. Sallenger Jr., J. H. List, G. Gelfenbaum, R. P. Stumpf, M. Hansen
1995, Journal of Coastal Research (11) 1383-1388
On a clear calm evening during July 1992, an anomalously large wave, reportedly 6 m high struck the Daytona Beach, Florida area. It is hypothesized that a squall line and associated pressure jump, travelling at the speed of a free gravity wave, coupled resonantly with the sea surface forming the...
Malignant lymphoma in black bullhead from Allouez Bay, Superior, Wisconsin, USA
V. S. Blazer, C.S. Schrank
1995, Diseases of Aquatic Organisms (23) 229-234
Leukemic malignant lymphoma was diagnosed in a black bullhead collected from Allouez Bay, in an industrialized Lake Superior estuary near Superior, Wisconsin, USA. No gross signs of thymic involvement were observed and it is believed this tumor originated in the hematopoetic tissue of the kidney. Neoplastic cells infiltrated excretory...
A possible deficiency in estimates of wet deposition obtained from data generated by the NADP/NTN network
H.C. Claassen, D.R. Halm
1995, Atmospheric Environment (29) 437-448
A conventional precipitation scavenging model is used to evaluate the effect of the performance of a wet-deposition collector on the reported deposition amounts. Three National Atmospheric Deposition Program/National Trends Network sites in semi arid western Colorado were chosen to evaluate chloride and sulfate wet deposition. Observations of the performance of...
Geophysical expression of the Ghost Dance fault, Yucca Mountain, Nevada
D. A. Ponce, V.E. Langenheim
Hughes Howard R., editor(s)
1995, Conference Paper, High Level Radioactive Waste Management - Proceedings of the Annual International Conference
Gravity and ground magnetic data collected along surveyed traverses across Antler and Live Yucca Ridges, on the eastern flank of Yucca Mountain, Nevada, reveal small-scale faulting associated with the Ghost Dance and possibly other faults. These studies are part of an effort to evaluate faulting in the vicinity of a...
Magnitude and frequency of 1993 flood volumes in Upper Mississippi River Basin
Rodney E. Southard
1995, Transportation Research Record 18-31
Previous maximum flows on many streams and rivers were exceeded during the flood of 1993 in the upper Mississippi River Basin. Not only were peak discharges exceeded at many streamflow-gaging stations, but also flood volumes were significantly higher than previous maximums. Rainfall amounts that were greater than 127 cm (50...
Optimal pumping strategies for managing shallow, poorquality groundwater, western San Joaquin Valley, California
P. Barlow, B. Wagner, K. Belitz
1995, Models for assessing and monitoring groundwater quality. Proc. symposium, Boulder, 1995 (227) 141-148
Continued agricultural productivity in the western San Joaquin Valley, California, is threatened by the presence of shallow, poor-quality groundwater that can cause soil salinization. We evaluate the management alternative of using groundwater pumping to control the altitude of the water table and provide irrigation water requirements. A transient, three-dimensional, groundwater...
Apparent digestion coefficients and metabolizable energy of feed ingredients for rainbow trout Oncorhynchus mykiss
R. R. Smith, R.A. Winfree, G.W. Rumsey, A. Allred, M. Peterson
1995, Journal of the World Aquaculture Society (26) 432-437
More than 50 feedstuffs used or of potential use in diets for rainbow trout Oncorhyndus mykiss were compared through metabolism chamber trials. Testing included determination of apparent digestibility and metabolic energy for a wide variety of ingredients, including fish and animal meals, vegetable proteins, and single cell protein products. Testing involved feeding...
Duration of mineralization and fluid-flow history of the Upper Mississippi Valley zinc-lead district
E. L. Rowan, M. B. Goldhaber
1995, Geology (23) 609-612
Studies of fluid inclusions in sphalerite and biomarkers from the Upper Mississippi Valley zinc district show homogenization temperatures to be primarily between 90 and 150 ° C, yet show relatively low levels of thermal maturity. We use numerical calculations to simulate fluid and...
Differing Eocene floral histories in southeastern North America and Western Europe: Influence of paleogeography
N. O. Frederiksen
1995, Historical Biology (10) 13-23
Pollen data show that in southeastern North America, the Eocene angiosperm flora attained its maximum relative diversity some 8 m.y. after the late early Eocene to earliest middle Eocene climatic maximum. Increasing diversity resulted in part from the flora's position on a large continent which allowed easy migration. In western...
Investigation of aquifer-system compaction in the Hueco basin, El Paso, Texas, USA
Charles Heywood
1995, Conference Paper, IAHS-AISH Publication
The Pleistocene geologic history of the Rio Grande valley in the Hueco basin included a cycle of sediment erosion and re-aggradation, resulting in unconformable stratification of sediment of contrasting compressibility and stress history. Since the 1950s large groundwater withdrawals have resulted in significant water-level declines and associated land subsidence. Knowledge...
Automated counting of waterfowl with image processing
D.J. Cunningham, W.H. Anderson, R.M. Anthony
1995, Wildlife Society Bulletin (23) 345-346
Sagebrush as a sampling medium for gold exploration in the Great Basin - evaluation from a greenhouse study
K. C. Stewart, D. M. McKown
1995, Journal of Geochemical Exploration (54) 19-26
Seedlings (Artemisia tridentata subsp, tridentata germinated from seed collected near Preble, Nevada were grown in soils containing Carlin-type disseminated gold ore. After 4 months growth leaves, twigs and stems were combined and analyzed by INAA. Plants grown in soils containing Carlin ore did not accumulate significantly more gold than those...
