Encephalization quotients and life-history traits in the Sirenia
T. J. O'Shea, R.L. Reep
1990, Journal of Mammalogy (71) 534-543
Relative brain size in the Sirenia is unusually small. Encephalization quotients are 0.27 for Florida manatees (Trichechus manatus) and 0.38 for dugongs (Dugong dugon). Estimates for Steller's sea cow (Hydrodamalis gigas) range from 0.12 to 0.19. These values are among the lowest known for Recent mammals, and seemingly have changed...
Effects of habitat fragmentation on a stream-dwelling species, the flattened musk turtle Sternotherus depressus
C.K. Dodd Jr.
1990, Biological Conservation (54) 33-45
The flattened musk turtle Sternotherus depressus has disappeared from more than half of its former range because of habitat modifications to stream and river channels in the Warrior River Basin, Alabama. Only 6·9% of its probable historic range contains relatively healthy populations, and most populations are fragmented by extensive areas of unsuitable...
Computer-aided procedure for counting waterfowl on aerial photographs
D. Bajzak, John F. Piatt
1990, Wildlife Society Bulletin (18) 125-129
Examination of 46 Canada goose goslings yielded 14 species of parasites, including five Protozoa, four Nematoda, two Cestoda, and three Trematoda. Evidence indicates that goslings acquired most of these infections during their first week of life. Some parasites, Prosthogonimus sp., occurred only in younger birds. Others, Leucocytozoon simondi, were...
Modeling the effects of serial off-gas reuse on the performance of a hooded surface oxygen obsorption system
Barnaby J. Watten, J. W. Meade, Claude E. Boyd
1990, Aquacultural Engineering (9) 97-120
A numerical model was used to evaluate the performance of a surface agitation system designed to contact commercial oxygen with water. The modeled system was unique in that oxygen-rich off-gas, normally discharged to the atmosphere, was directed in serial reuse through additional contact stages receiving untreated water. A correlation between...
Interpreting Yosemite geology: the role of the United States Geological Survey
N.K. Huber
1990, Conference Paper, Yosemite centennial symposium proceedings: natural areas and Yosemite: prospects for the future
No abstract available ...
Gas transfer within a multi-stage packed column oxygen absorber: Model development and application
Barnaby J. Watten, Claude E. Boyd
1990, Aquacultural Engineering (9) 33-59
A packed column oxygen obsorber was developed in which oxygen flow is directed, in serial reuse, through parallel packed column stages receiving equal portions of the liquid being treated. The relative performance of the absorber was established using a computer simulation program employing finite difference-mass transfer calculations. The program was...
Regional brain morphometry and lissencephaly in the Sirenia
Roger L. Reep, Thomas J. O’Shea
1990, Brain, Behavior and Evolution (35) 185-194
Neuroanatomical structure was examined in the brains of West Indian manatees (Trichechus manatus) using computer-based morphometric methods. Although manatees have a small relative brain size, volume estimates of the major brain regions indicate that the telencephalon comprises 71% of totalbrain volume and is 90% cerebral cortex. These values are comparable to those...
Line transect estimation of Red Hills salamander burrow density using a Fourier series
C.K. Dodd Jr.
1990, Copeia (1990) 555-557
No abtract available....
Feeding chronology of juvenile piranhas, Pygocentrus notatus, in the Venezuelan llanos
L.G. Nico
1990, Environmental Biology of Fishes (29) 51-57
During the 1988 rainy season, I studied the 24 h feeding chronology of juvenile (40–68 mm standard length) piranhas, Pygocentrus notatus (Characidae: Serrasalminae) from a natural population inhabiting a small savanna stream in Apure State, Venezuela. Stomach contents analyses, supported by laboratory determinations of digestion rate, showed that these fish...
Oxygen isotope map of the giant metamorphic-hydrothermal system around the northern part of the Idaho batholith, U.S.A.
R.E. Criss, R.J. Fleck
1990, Applied Geochemistry (5) 641-655
Determinations of δ18O values from 100 outcrops of Belt Supergroup (Wallace Fm.) metasedimentary rocks in the Idaho panhandle reveal a regular regional pattern that was produced by pervasive fluid infiltration and isotopic exchange. Low grade argillites at large distances (60 km)...
Source parameters and effects of bandwidth and local geology on high- frequency ground motions observed for aftershocks of the northeastern Ohio earthquake of 31 January 1986
G. Glassmoyer, R. D. Borcherdt
1990, Bulletin of the Seismological Society of America (80) 889-912
A 10-station array (GEOS) yielded recordings of exceptional bandwidth (400 sps) and resolution (up to 96 dB) for the aftershocks of the moderate (mb ≈ 4.9) earthquake that occurred on 31 January 1986 near Painesville, Ohio. Nine aftershocks were recorded with seismic moments ranging between 9 × 1016 and 3 × 1019 dyne-cm...
Multichannel seismic reflection surveys over the Antarctic continental margin relevant to petroleum resource studies
John C. Behrendt
1990, Book chapter, Antarctica as an exploration frontier-hydrocarbon potential, geology, and hazards
More than 100,000 km of marine multichannel seismic profiles have been acquired over the continental margin of Antarctica since 1976 by scientific research programs of Australia, Brazil, France, Italy, Japan, Norway, Poland, United Kingdom, United States, U.S.S.R. and West Germany. Although scientific results are reported for most of these data,...
Impact assessment of exploratory wells offshore South Florida
Eugene A. Shinn, Barbara H. Lidz, Phillip A. Dustan
1990, Book
No abstract available...
Sources and fractionation processes influencing the isotopic distribution of H, O and C in the Long Valley hydrothermal system, California, U.S.A.
A. F. White, M. L. Peterson, H. Wollenberg, S. Flexser
1990, Applied Geochemistry (5) 571-585
The isotopic ratios of H, O and C in water within the Long Valley caldera, California reflect input from sources external to the hydrothermal reservoir. A decrease in δD in precipitation of 0.5‰ km−1, from west to east across Long Valley,...
International decade for natural disaster reduction
W. W. Hays
1990, Earthquakes & Volcanoes (USGS) (22) 33-39
Throughout history, humanity has found itself in conflict with naturally occurring events of geologic, hydrologic, and atmospheric origin. this conflict has been demonstrated repeatedly when people build urban centers at the water's edge, in or near active fault systems capable of generating earthquakes, on steep slopes, near active volcanoes, or...
Inside active volcanoes; an exhibit on the move!
R.S. Fiske
1990, Earthquakes & Volcanoes (USGS) (22) 232-233
All of us are aware of the emphasis currently being placed in the United States on science education and public understanding of science. Most of this emphasis is directed toward mass audiences through book publications, school curricula, and television programs; sadly, most of it deals with non-earth science topics. In...
An earthquake strength scale for the media and the public
A. C. Johnston
1990, Earthquakes & Volcanoes (USGS) (22) 214-216
Let's face it: seismologists do a pretty poor job of communicating the facts about our science to the public. Earthquake magnitude is the classic example. How many of us have struggled to explain the Richter scale? We explain that it is logarithmic, with each unit indicating a factor of 10...
Earthquakes in New England
E. S. Fratto, J.E. Ebel, K. Kadinsky-Cade
1990, Earthquakes & Volcanoes (USGS) (22) 242-249
Believe it or not, New England is earthquake country. No, it does not have the high frequency of earthquakes of California or Japan. nevertheless, New England has experienced its fair share of tremors. New England has a long history of earthquakes. Some of the first explorers were startled when they experienced...
Plant communities of Santa Rosa Island, Channel Islands National Park
Ronilee A. Clark, William L. Halvorson, Andell A. Sawdo, Karen C. Danielsen
1990, Technical Report 42
A survey of the plant communities on Santa Rosa Island, Channel Islands National Park, was conducted from January through July 1988. Vegetation data were collected at 296 sites using a releve technique. The plant communities described include: grassland, coastal marsh, caliche scrub, coastal sage scrub, lupine scrub, baccharis scrub, coastal...
The hydrologic role of the unsaturated zone of a forested colluvium-mantled hollow
B.B. Amen
1990, Technical Report 26
No abstract available at this time...
Site 765: Sedimentology
Leg 123 Shipboard Scientific Party
1990, Proceedings of the Ocean Drilling Program: Initial Reports (123) 113
Various techniques were used to decipher the sedimentation history of Site 765, including Markov chain analysis of facies transitions, XRD analysis of clay and other minerals, and multivariate analysis of smear-slide data, in addition to the standard descriptive procedures employed by the shipboard sedimentologist. This chapter presents brief summaries of...
Site 765: Sediment Lithostratigraphy
Leg 123 Shipboard Scientific Party
1990, Proceedings of the Ocean Drilling Program: Initial Reports (123) 76-94
A 935-m-thick succession of Quaternary through Lower Cretaceous sediments was recovered at Site 765 (Fig. 10). A single core of Quaternary sediment was obtained from Hole 765A; drilling terminated and a new hole was drilled in an attempt to establish the mud line. Quaternary through middle Miocene sediments were cored...
Role of water in the smectite-to-illite reaction
Gene Whitney
1990, Clays and Clay Minerals (38) 343-350
A series of hydrothermal experiments was performed to determine the effect of fluid abundance on the reaction of smectite to illite. Experiments were conducted on K-saturated montmorillonite (<0.1-µm fraction) in a closed system at 250° to 400°C using run times of 1, 7, 14, 30, and 60 days at 100...
Mudflow rheology in a vertically rotating flume
Robert R. Holmes Jr., Jerome A. Westphal, Harvey E. Jobson
French Richard H., editor(s)
1990, Conference Paper, Hydraulics/Hydrology of Arid Lands
Joint research by the U.S. Geological Survey and the University of Missouri-Rolla currently (1990) is being conducted on a 3.05 meters in diameter vertically rotating flume used to simulate mudflows under steady-state conditions. Observed mudflow simulations indicate flow patterns in the flume are similar to those occurring in natural mudflows....
Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments
Robert G. Striegl, D.E. Armstrong
1990, Geochimica et Cosmochimica Acta (54) 2277-2283
Retention of CO2 on three air-dried and partly water-saturated glacial and eolian sediments was measured at 20°C for a range in, PCO2 that commonly occurs in unsaturated zones. Ratios of the relative losses of CO2 and 14CO2 from a surrogate atmosphere overlying the sediments were 1:1 for the dry condition. For the wet condition, those relative...
