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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Variation In Sulfur Dioxide Emissions Related To Earth Tides, Halemaumau Crater, Kilauea Volcano, Hawaii, Charles B. Connor, Richard E. Stoiber, Lawrence L. Malinconico Jr.
Variation In Sulfur Dioxide Emissions Related To Earth Tides, Halemaumau Crater, Kilauea Volcano, Hawaii, Charles B. Connor, Richard E. Stoiber, Lawrence L. Malinconico Jr.
School of Geosciences Faculty and Staff Publications
Variation in SO2 emissions from Halemaumau crater, Kilauea volcano, Hawaii is analyzed using a set of techniques known as exploratory data analysis. SO2 flux was monitored using a correlation spectrometer. A total of 302 measurements were made on 73 days over a 90‐day period. The mean flux was 171 t/d with a standard deviation of 52 t/d. A significant increase in flux occurs during increased seismic activity beneath the caldera. SO2 flux prior to the this change varies in a systematic way and may be related to variation in the tidal modulation envelope.
The Cultural Eutrophication Of Koontz Lake, Indiana: Causes, Consequences, Correction, Willaim B. Eviston, Thomas Crisman
The Cultural Eutrophication Of Koontz Lake, Indiana: Causes, Consequences, Correction, Willaim B. Eviston, Thomas Crisman
School of Geosciences Faculty and Staff Publications
No abstract provided.
Effect Of Wet Tropospheric Path Delays On Estimation Of Geodetic Baselines In The Gulf Of California Using The Global Positioning System, David M. Tralli, Timothy H. Dixon, Scott A. Stephens
Effect Of Wet Tropospheric Path Delays On Estimation Of Geodetic Baselines In The Gulf Of California Using The Global Positioning System, David M. Tralli, Timothy H. Dixon, Scott A. Stephens
School of Geosciences Faculty and Staff Publications
Geodetic baseline measurements using the Global Positioning System (GPS) were acquired in the Gulf of California between Loreto and Cabo San Lucas in Baja California and Mazatlan on the mainland of Mexico. Tropospheric water vapor content was high during the experiment, typically yielding wet path delays in excess of 20 cm at zenith. Surface meteorological (SM) and water vapor radiometer (WVR) measurements were recorded at each site, providing independent means of calibrating the GPS signal for the wet tropospheric path delay. Residual wet delays at zenith are estimated as constants and also as first-order exponentially correlated stochastic processes. In addition, …
Evolutionary Genetics And Morphometrics Of A Cave Crayfish Population From Chiapas (Mexico), Valerio Sbordoni, Giuliana Allegrucci, Fabiola Baldari, Donatella Cesaroni
Evolutionary Genetics And Morphometrics Of A Cave Crayfish Population From Chiapas (Mexico), Valerio Sbordoni, Giuliana Allegrucci, Fabiola Baldari, Donatella Cesaroni
International Journal of Speleology
The recently explored Cueva de Los Camarones, in the remote village of Constitucion, Chiapas, Mexico, houses a unique highly variable population of Procambarus crayfish (Crustacea, Decapoda). Morphologically, a more or less clinal variation is revealed at several features such as the degree of rudimentation in both pigmentation and eye, and the elongation of body and appendages. Extremes are quite different, ranging from typical dark, thick, eyed individuals to light, elongated, microphtalmic phenotypes. Evolutionary relationships among individuals were investigated electrophoretically (25 structural gene loci) and morphometrically (12 characters) by means of multivariate analyses. Results from analysis of individual allozymic multilocus profiles …
Pseudosinella Revisited (Collembola, Entomobryinae), Kenneth Christiansen
Pseudosinella Revisited (Collembola, Entomobryinae), Kenneth Christiansen
International Journal of Speleology
Eight controversies are active in the study of macroevolution. These are: 1) the meaning of the term macroevolution, 2) the role of chance, 3) the role of stasis and gradualism, 4) whether significant change is Iimited to speciation events, 5) the environmental conditions where macroevolutionary change occurs, 6) whether Neodarwinian mechanisms are adequate to explain change, 7) the existence and nature of hierarchical evolutìonary processes, and 8) Darwin’s views about all this. After a brief examination of each of these issues we used the extensive data available for 9 species of European and Nearctic cave Pseudosinella to examine the third, …
Mating Behaviour And Barriers To Hybridization In The Cave Beetle Of The Speonomus Delarouzeei Complex (Coleoptera, Catopidae, Bathysciinae), Lysiane Juberthie-Jupeau
Mating Behaviour And Barriers To Hybridization In The Cave Beetle Of The Speonomus Delarouzeei Complex (Coleoptera, Catopidae, Bathysciinae), Lysiane Juberthie-Jupeau
International Journal of Speleology
The complex Speonomus delarouzeei combines 6 species which were previously synonymized. Using behavioural data, based on 12 populations, the author assesses the validity of 4 species and points out the occurrence of 2 species as yet undescribed. Constant and important differences during the mating appear between these different species. They concern the number of behavioural steps, the duration, the number of clappings of antennae, the abdominal male movements and the rubbing of female abdomen. The results of crossing experiments between different species indicate a prezygotic reproductive isolation with atypical matings and no sperm deposit. Between the populations of S. delarouzeei …
A Few Parts In 108 Geodetic Baseline Repeatability In The Gulf Of California Using The Global Positioning System, David M. Tralli, Timothy H. Dixon
A Few Parts In 108 Geodetic Baseline Repeatability In The Gulf Of California Using The Global Positioning System, David M. Tralli, Timothy H. Dixon
School of Geosciences Faculty and Staff Publications
Global Positioning System (GPS) geodetic measurements of 350–650 km baselines across the Pacific-North America plate boundary in the Gulf of California are presented. The analysis employs a four-station U.S. fiducial network and combined carrier phase and pseudorange data. Water vapor radiometer (WVR) data at the Gulf sites are used to calibrate the GPS signal for wet tropospheric path delays. Residual tropospheric delays are modeled as first-order exponentially correlated stochastic processes. The measurement precision for horizontal components is a few parts in 108 or better. Comparison of the Gulf data with other geodetic techniques is not yet possible, however the …
Lake Apopka Trophic Structure Manipulation, Thomas Crisman, John R. Beaver
Lake Apopka Trophic Structure Manipulation, Thomas Crisman, John R. Beaver
School of Geosciences Faculty and Staff Publications
No abstract provided.
Paleoenvironment And Speciation In The Cave Beetle Complex Speonomus Delarouzeei (Coleoptera, Bathysciinae), Christian Juberthie
Paleoenvironment And Speciation In The Cave Beetle Complex Speonomus Delarouzeei (Coleoptera, Bathysciinae), Christian Juberthie
International Journal of Speleology
In the eastern part of the Pyrenees (France) the author describes a scenario of speciation in the cave species complex Speonomus delarouzeei (Coleoptera Bathysciinae); the speciation processes have been initiated by a breakdown of the ecological equilibrium induced during three glacial-interglacial episodes. The scenario is the following: — during the first glaciation (2.3-2.1 MY), psychrophilic populations ancestral to S. brucki were selected over the highest elevation of the range, by means of cold effect which produced an adaptive demographic advantage; adaptive characters of troglobitic species (K strategy) take place presumably in relation to colonization of caves and M.S.S.; — during …