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Articles 3481 - 3510 of 3859
Full-Text Articles in Physical Sciences and Mathematics
Food-Finding Ability In Cave Fish (Astyanax Fasciatus), Kathrin Hüppop
Food-Finding Ability In Cave Fish (Astyanax Fasciatus), Kathrin Hüppop
International Journal of Speleology
When competing under cave similar conditions, such as darkness and food scarcity, cave fish find much more food than their epigean relatives. The cave fish not only react much faster to food but also their food-finding ability is four times higher compared to that of the epigean fish. Several morphological and ethological alterations in the cave fish, described by other authors, seem to be responsible for this adaptation to the cave conditions.
Winter And Summer Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers
Winter And Summer Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers
Reports
Winter and summer in-situ measurements of sediment oxygen demand (SOD) and nutrient exchange rates (NERs) were taken from sandy and muddy sediments in Hillsborough Bay during 1986. The summer-mud SOD rate of 0.23 g 02/m2/hr was roughly twice the summer-sand, winter-sand and winter-mud SOD rates. In general, nutrient flux rates into the water column were usually greater from mud relative to sand, and during the summer compared to the winter. Reservations in the application of the SOD/NER data and recommendations for future SOD/NER measurements are discussed.
Ecological Assessment, Classification And Management Of Tampa Bay Tidal Creeks, Tampa Bay Regional Planning Council (Tbrpc)
Ecological Assessment, Classification And Management Of Tampa Bay Tidal Creeks, Tampa Bay Regional Planning Council (Tbrpc)
Reports
The final product is a detailed restoration and management plan for three minor tributaries in the Tampa Bay watershed and one general application. It is the intent of the Council to implement all elements of the four plans wherever feasible during Developments of Regional Impact (DRI's) and Intergovernmental Coordination and Review (IC&R) reviews and through coordinat.ion with the DNR gill-net license fee habitat restoration program, as well as local government initiatives. The efforts of the Council's Agency on Bay Management will also be critical in implementing the findings and recommendations of this project.
Preliminary Study Of The Seagrasses In Middle Tampa Bay Between Apollo Beach And Simmons Park, Mangrove Systems, Inc.
Preliminary Study Of The Seagrasses In Middle Tampa Bay Between Apollo Beach And Simmons Park, Mangrove Systems, Inc.
Reports
Comparison of recent (1986) and earlier (1983) aerial photography indicated that an apparent recovery of seagrasses was occurring on the subtidal shelf north of Simmons Park (Ruskin) and south of Apollo Beach, in Middle Tampa Bay (Fig. 1). This was suggested by the numerous circular patches of grass observed on the offshore portions of the shelf. This observation provided the incentive to undertake a preliminary assessment of seagrass species composition, percent cover, and shoot density along transects in this area. This study was a cooperative effort between the Bay Study Program (City of Tampa) and Mangrove Systems, Inc.
1986 Florida Water Quality Assessment 305(B) Technical Report, Joe Hand, Victoria Tauxe, John Watts, Bureau Of Water Quality Management - Division Of Environmental Programs
1986 Florida Water Quality Assessment 305(B) Technical Report, Joe Hand, Victoria Tauxe, John Watts, Bureau Of Water Quality Management - Division Of Environmental Programs
Reports
This report identifies the quality and trends of Florida's surface waters, the causes of water quality problems and the present cleanup activities conducted by DER and EPA to improve these problem areas. The assessment was accomplished by analyzing the available STORET water quality data for the 1970-1985 time period (STORET is EPA's computerized water quality data base). Data from approximately 97,000 water quality samples were assessed in this report which necessitated the extensive use of computer analysis. The computer analysis required assigning STORET stations to their respective EPA reaches. The EPA reach designation is a convenient national numbering system similar …
Winter Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers
Winter Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers
Reports
The winter sampling of the sediment nutrient exchange rate study of Hillsborough Bay has been completed. These results constitute the interim report of the winter nutrient exchange sampling of Phase II as described in the Plan of Study submitted to the Florida Department of Environmental Regulation on March 31, 1986. The results include winter SOD rate estimates in sandy and muddy sediments. Results also include winter NER estimates in sandy and muddy sediments for total phosphorus (unfiltered), PO4-P, TKN (unfiltered), NO2-N+NO3-N, NH3-N and organic N. These data, in conjunction with the forthcoming …
Transient Electromagnetic Sounding For Groundwater, David V. Fitterman, Mark T. Stewart
Transient Electromagnetic Sounding For Groundwater, David V. Fitterman, Mark T. Stewart
Geology Faculty Publications
The feasibility of using the transient electromagnetic sounding (TS or TDEM) method for groundwater exploration can be studied by means of numerical models. As examples of its applicability to groundwater exploration, we study four groundwater exploration problems: (1) mapping of alluvial fill and gravel zones over bedrock; (2) mapping of sand and gravel lenses in till; (3) detection of salt or brackish water interfaces in freshwater aquifers; and (4) determination of hydrostratigraphy. These groundwater problems require determination of the depth to bedrock; location of resistive, high-porosity zones associated with fresh water; determination of formation resistivity to assess water quality; and …
Determination Of Large-Scale Velocity Structure Of The Crust And Upper Mantle In The Vicinity Of Pavlof Volcano, Alaska, Stephen R. Mcnutt, K. H. Jacob
Determination Of Large-Scale Velocity Structure Of The Crust And Upper Mantle In The Vicinity Of Pavlof Volcano, Alaska, Stephen R. Mcnutt, K. H. Jacob
School of Geosciences Faculty and Staff Publications
Pavlof Volcano is a 2715-m-high stratovolcano located at latitude 55.4°N and longitude 161.9°W, near the western end of the Alaska Peninsula. In this study the large-scale lateral perturbations to a vertical reference velocity structure in the vicinity of Pavlof Volcano are determined using modified versions of standard three-dimensional inversion techniques. We use as the primary data set P wave arrival times and residuals from shallow (deep) regional earthquakes located by the Shumagin Islands seismic network. Relative residuals mainly from refracted (e.g., Pn) arrivals allow us to constrain models for a laterally varying crustal velocity structure. Several strong ray path dependent …
Surface Sediment Composition And Distribution In Hillsborough Bay, Florida 1986, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Surface Sediment Composition And Distribution In Hillsborough Bay, Florida 1986, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Reports
Surface sediments were mapped to determine the approximate boundaries and percent areal coverage of "mud" in Hillsborough Bay. Depth recorder soundings along 29 transects were used in conjunction with sediment grain size analyses form 19 stations to produce a sediment map.
A Study Plan Of Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers
A Study Plan Of Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers
Reports
The City of Tampa is planning a study of sediment nutrient exchange rates in Hillsborough Bay, Florida. The study will supply the FDER Water Quality Analysis Section with information to refine the mathematical modeling of Hillsborough Bay for wasteload allocation. The initial effort, Phase I, will produce a map of Hillsborough Bay identifying areas of "sandy" and "muddy" sediments, and to estimate the areal coverage of these sediment types. The secondary effort, Phase II, will estimate seasonal nutrient exchange rates for "sandy" and "muddy" sediments at a minimum of two locations in Hillsborough Bay. The seasonal estimates of sediment nutrient …
1986 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
1986 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 1986.
1986 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
1986 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 1986.
Historical Analysis Of The Cultural Eutrophication Of Lake Maxinkuckee, Indiana, Thomas Crisman
Historical Analysis Of The Cultural Eutrophication Of Lake Maxinkuckee, Indiana, Thomas Crisman
School of Geosciences Faculty and Staff Publications
No abstract provided.
The Speleogenetic Role Of Air Flow Caused By Convection. 1st Contribution, Arrigo A. Cigna, Paolo Forti
The Speleogenetic Role Of Air Flow Caused By Convection. 1st Contribution, Arrigo A. Cigna, Paolo Forti
International Journal of Speleology
In the past some authors described the speleogenetic role of convection in phreatic conditions. Similar effects exist also in the air-filled part of vadose passages of caves as a consequence of an air circulation due to a relevant temperature gradient; the effects can be enhanced by the presence of some acids as, e.g., H2S, H2SO4, etc. In this paper the conditions matching convection and condensation which produce typical forms, very similar to those found under phreatic conditions, are discussed both for limestone and gypsum caves.
Origination Of Stone Forests In China, Lin Hua Song
Origination Of Stone Forests In China, Lin Hua Song
International Journal of Speleology
The stone forests are widely distributed in the tropical and subtropical climatic areas. The stone forests may be divided into hilltop stone forest, hill slope stone forest and the stone forest in the depressions or valleys. The conditions for stone forest development should be (1) thick and pure limestone, (2) gentle dipping of limestone formation, generally less than 15°, (3) a lot of vertical joint and fissure networks, (4) the soil covering on the limestone surface inhomogeneous, thick in the fissures and thin on the rock top surface, and (5) the soil should be wet and contain rich organic materials …
Use Of Cave-Maps For Tectonic Surveys, Franz Jaskolla, Peter Volk
Use Of Cave-Maps For Tectonic Surveys, Franz Jaskolla, Peter Volk
International Journal of Speleology
Results of the author’s investigations show the useful application of cave-map-data for tectonic assessment. Considering speleological features, cave genesis, and structural differences, it is possible to select of the cave map’s pattern various jointing and stress systems. By 7 selected cave maps, representing areas of different tectonic history (W-Germany, Austria and Switzerland) it will be demonstrated that three types of kinematic joint-systems can be identified (fundamental, orthogonal- fold- and shear-system). Therefore, tectonic models are expected to become more valuable. It must be stated that future tectonic investigations in karst-areas should include the additional use of cave maps.
Kurzbericht Der Ersten Deutschen Speläologischen Himalaya-Expedition, Herbert Daniel Gebauer
Kurzbericht Der Ersten Deutschen Speläologischen Himalaya-Expedition, Herbert Daniel Gebauer
International Journal of Speleology
The first German speleological expedition to the Himalaya went to the terrace sediments of Pokhara, Nepal. New discoveries could be made in the longest cave of the Himalaya (Patalae Chhango or Harpan-River-Cave) and other caves were surveyed for the first time. Due to the observations the classification of conglomerate-caves as pseudokarst-appearances has to be questioned.
Evidence For Karstic Mechanisms Involved In The Evolution Of Moroccan Hamadas, Vittorio Castellani, Walter Dragoni
Evidence For Karstic Mechanisms Involved In The Evolution Of Moroccan Hamadas, Vittorio Castellani, Walter Dragoni
International Journal of Speleology
Underground tubular karst features, observed in an arid envinronment of southern Morocco, are described. On the basis of various evidences, it is suggested that such features were originated mainly by condensation water. A computation of the time necessary for their formation supports this hypothesis.
Hydrocarbon Levels In Tampa Bay Final Report, Larry J. Doyle, Edward S. Van Vleet, William M. Sackett, Norman J. Blake, Gregg R. Brooks
Hydrocarbon Levels In Tampa Bay Final Report, Larry J. Doyle, Edward S. Van Vleet, William M. Sackett, Norman J. Blake, Gregg R. Brooks
Reports
The primary purpose of this project was to establish and characterize, as far as possible, hydrocarbon base levels for the Tampa Bay Estuary. In addition, we were to characterize 1) hydrocarbon molecular compositions, 2) the isotopic composition of total and lipid sediment organic carbon, and 3) evaluate the potential for utilizing isotopic analyses to quantify and determine the extent of future oil spills.
Geophysical And Hydrogeological Effects Of Astorm-Water Retention Pond On The Floridan Aquifer, Hillsborough County, Florida, Abdullah M. Alamri
Geophysical And Hydrogeological Effects Of Astorm-Water Retention Pond On The Floridan Aquifer, Hillsborough County, Florida, Abdullah M. Alamri
USF Tampa Graduate Theses and Dissertations
An integrated geologic, hydrologic, and geophysical investigation was conducted to determine the effect of a storm-water retention pond on the Floridan aquifer. Surface DC resistivity surveys were used to delineate the hydrostratigraphy. There are four distinct geoelectric layers: (1) Layer 1, high resistivity, 3 meters thick, fine to very fine unsaturated sand; (2) Layer 2, moderate resistivity, 1 to 2.5 meters thick, saturated sands and silts; (3) Layer 3, lower resistivity, 4 to 10 meters thick, silt and clay; (4) Layer 4, moderate resistivity, argillaceous limestone. Two fracture zones are defined by resistivity lows and marked by deep, V-shaped depressions …
Hillsborough Bay Macroalgae Study Final Report, Mangrove Systems, Inc.
Hillsborough Bay Macroalgae Study Final Report, Mangrove Systems, Inc.
Reports
Hillsborough Bay. the northeastern portion of the Tampa Bay estuarine system (Fig. 1) has long suffered from the problems caused by industry and urbanization (Simon 1974). The macroalgal community of this estuary has been identified as a source of nuisance odor problems for many years. A study by the Federal Water Pollution Control Administration (FWPCA 1969) indicated that these problems resulted from degraded water quality (primarily eutrophication) which led to large populations of one or two species of marine red algae (Gracilaria spp.). Seasonal freshwater input resulted in the death and decay of these quantities of algae, producing the odor …
The Invertebrate Faunas Of Tropical American Caves, Part 6: Jumandi Cave, Ecuador, Stewart B. Peck
The Invertebrate Faunas Of Tropical American Caves, Part 6: Jumandi Cave, Ecuador, Stewart B. Peck
International Journal of Speleology
Twenty-two species of invertebrates are reported from Jumandi Cave, Napo Province, Ecuador. Three are probably trogloxenes, and the other 19 are troglophiles. The only troglobite is the catfish Astroblepus pholeter.
The Occurrence Of The Troglobitic Amphipod, Stygobromus Tenuis Tenuis (Smith) (Crangonyctidae) In The Taconic Mountains Of Southwestern Massachusetts (Usa): A Case For The Existence Of A Subterranean Refugium In A Glaciated Region, Douglas G. Smith
International Journal of Speleology
Stygobromus t. tenuis is one of only two species of troglobitic amphipods known to occur in the New England physiographic province. The rarity of subterranean organisms in New England is attributed to limited karst development and eradication of organisms from the region during glacial times. Traditionally it has been believed that those troglobitic species presently occurring north of the glacial terminus migrated there following glacial retreat from refugia south of the areas influenced by glacial conditions. However, a few recent studies favour the existence of subsurface refugia in glaciated regions during glacial times. Stygobromus t. tenuis is recorded from springs …
Polydesmide Et Craspedosomides Cavernicoles Nouveaux De France Et Du Maroc (Myriapoda - Diplopoda), Jean Paul Mauriès
Polydesmide Et Craspedosomides Cavernicoles Nouveaux De France Et Du Maroc (Myriapoda - Diplopoda), Jean Paul Mauriès
International Journal of Speleology
This is a description of the affinities and biogeographic significance of three new cavernicolous species of Diplopoda from France and Morocco. One species apparently belongs to the Polydesmida (family Paradoxosomidae) and the other two to Craspedosomida (families Caratosphydae and Chordeumidae).
1) Eviulisoma abadi n.sp. is distinguished from other species of this genus by total depigmentation, by the characters of the gonopodial orifice and the male gonopods, by the low number of segments (19) and by its geographic isolation (Morocco) and ecology (Kef Aziza cave). This justifies the establishment of a new sub-genus, Jeekelosoma. The other species of this genus …
New Records For Salentinella Ruffo (Crustacea Amphipoda) From Phreatic Waters Of Italy And Greece, Giuseppe Lucio Pesce
New Records For Salentinella Ruffo (Crustacea Amphipoda) From Phreatic Waters Of Italy And Greece, Giuseppe Lucio Pesce
International Journal of Speleology
New localities for the subterranean amphipod Salentinella Ruffo from central-eastern Mediterranean are reported. New collecting localities are listed for Italy, continental Greece and islands of Cephalonie and Zante. Furthermore, some remarks are made about the systematics, the variability and the ecology of the genus. Moreover, the Author refers to the main characteristics of a Salentinella sp. from central Italy, showing intermediate features between S. angelieri and S. franciscoloi. A map of the distribution of the genus Salentinella in Italy and in the Balkan-Dalmatian Peninsula is enclosed.
Morphological Clines In Reduced Areas. The Case Of Henrotius Jordai (Reitter), Cave-Dwelling Beetle From Majorca Island, Xavier Bellés
Morphological Clines In Reduced Areas. The Case Of Henrotius Jordai (Reitter), Cave-Dwelling Beetle From Majorca Island, Xavier Bellés
International Journal of Speleology
The present paper shows a statistically significant correlation between the geographical latitude and the morphological variation of the pronotum of Henrotius jordai (Reitter) (Col. Caraboidea), cave-dwelling beetle from Majorca island, after studying the linear and curvilinear regression between these two variables. The existence of specimens situated at different heights of the regression lines leads to the conclusion that morphological variation is clinal. The phenomenon of “semi-isolation” to which the studied populations are subjected, because of their cavernicolous character, allows to explain the existence of a cline in such a restricted area as that occupied by this beetle (ca. 500 Km …
Two New Genera Of Cave-Dwelling Millipedes (Diplopoda), With Remarks On The Millipede Fauna Of West Caucasian Caves, Sergei I. Golovatch
Two New Genera Of Cave-Dwelling Millipedes (Diplopoda), With Remarks On The Millipede Fauna Of West Caucasian Caves, Sergei I. Golovatch
International Journal of Speleology
Two new genera and species of the Diplopoda from Caucasian caves are described: troglobitic Caucasodesmus inexpectatus n.g., n.sp. (family Macrosternodesmidae) from a cave in North Osetia, North Caucasus, and troglophilic Ratcheuma excorne n.g., n.sp. (family Antroleucosomatidae) from a cave in Racha, Georgia, Transcaucasia. Millipedes of the western Caucasian cavernicolous fauna are reviewed as regards their distribution, relationship with caves and zoogeographical connections.
Nouvelles Données Morphologiques Et Caryologie Du Triclade Hypogé Pyrénéen Dendrocoelum Lescherae, Nicole Gourbault
Nouvelles Données Morphologiques Et Caryologie Du Triclade Hypogé Pyrénéen Dendrocoelum Lescherae, Nicole Gourbault
International Journal of Speleology
The study of a new strain of the hypogeous Tricladida Dendrocoelum lescherae has demonstrated the very low anatomical variability of this species. The chromosome complement was found to be 2n = 32; measurements of somatic mitoses have shown that these elements are metacentric; the gametocytes possess 16 bivalents. Number and morphology of the chromosomes are similar within the subgenus Dendrocoelides.
The Anatomy And Histology Of The Alimentary Tract Of The Blind Catfish Horaglanis Krishnai Menon, T. V. Anna Mercy, N. Krishna Pillai
The Anatomy And Histology Of The Alimentary Tract Of The Blind Catfish Horaglanis Krishnai Menon, T. V. Anna Mercy, N. Krishna Pillai
International Journal of Speleology
H. krishnai is a blind catfish inhabiting the dug-out wells at Kottavam Kerala, South India. Studies on the alimentary tract of the fish show that, the alimentary tract, though typically teleostean, shows several adaptive modifications. The bulbous stomach helps in storing food which is helpful in an environment chronically deficient in food. The ileo-rectal sphincter helps in retaining the digested food in the intestine for a long duration to facilitate maximum absorption. This is very helpful as the intestine is short. The liver is well developed.
Patterns Of Earthquakes And The Effect Of Solid Earth And Ocean Load Tides At Mount St. Helens Prior To The May 18, 1980, Eruption, Stephen R. Mcnutt, R. J. Beavan
Patterns Of Earthquakes And The Effect Of Solid Earth And Ocean Load Tides At Mount St. Helens Prior To The May 18, 1980, Eruption, Stephen R. Mcnutt, R. J. Beavan
School of Geosciences Faculty and Staff Publications
Seismographs near Mount St. Helens Volcano recorded an earthquake swarm lasting nearly 2 months prior to the catastrophic May 18, 1980, eruption. The earthquakes are divided into four classes based on station CPW (Δ = 116 km) seismogram characteristics: (1) events with Sv:P amplitude ratio >3 and dominant frequency >3 Hz; (2) events with Sv:P ratio between 1 and 3 and dominant frequency >2 Hz; (3) events similar to characteristic 2 but with a strong (probably surface wave) phase just after the S phase; and (4) events with frequencies between 1 and 2 Hz lacking a clear S phase. The …