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Articles 16921 - 16950 of 17788
Full-Text Articles in Entire DC Network
The Geology And Environment Of Deposition Of The Kinneman Creek Interval, Sentinel Butte Formation (Paleocene), North Dakota, Katherine J. Logan
The Geology And Environment Of Deposition Of The Kinneman Creek Interval, Sentinel Butte Formation (Paleocene), North Dakota, Katherine J. Logan
Theses and Dissertations
To date, most environmental reconstructions of lignite bearing formations in western North Dakota have been done on a formational scale. The objective of this study was to investigate one of the non-lignite intervals, the Kinneman Creek Interval, directly above the strati graphically lowest lignite in the Paleocene Sentinel Butte Formation. The Kinneman Creek Interval has been recognized in the Sentinel Butte Formation throughout most of western North Dakota.
The field area is located in west-central North Dakota in Mercer, Oliver, and McLean Counties and is bisected by the Missouri River. Excellent exposures are provided in the highwalls of Baukol-Noonan, North …
Large-Scale Operations Management Test Of Use Of The White Amur For Control Of Problem Aquatic Plants. Report 2. First Year Poststocking Results. Volume Iii. The Plankton And Benthos Of Lake Conway, Florida, Thomas Crisman, Floor M. Kooijam, University Of Florida, Department Of Enviromental Engineering Sciences
Large-Scale Operations Management Test Of Use Of The White Amur For Control Of Problem Aquatic Plants. Report 2. First Year Poststocking Results. Volume Iii. The Plankton And Benthos Of Lake Conway, Florida, Thomas Crisman, Floor M. Kooijam, University Of Florida, Department Of Enviromental Engineering Sciences
School of Geosciences Faculty and Staff Publications
No abstract provided.
Genetic Differentiation In Populations Of The Freshwater Amphipod Gammarus Minus Say In A Karst Area, Steven W. Hetrick, James L. Gooch
Genetic Differentiation In Populations Of The Freshwater Amphipod Gammarus Minus Say In A Karst Area, Steven W. Hetrick, James L. Gooch
International Journal of Speleology
The genetic makeup of populations in a particular geographic area should conform, in part, to environmental structure. Three polymorphic enzyme loci in the amphipod Gammarus minus are geographically differentiated in gene frequencies in the mid-Appalachian Mountains of the eastern United States, and genetic breaks usually coincide with topographical features and stream divides. Areas with well integrated drainage systems have a high degree of genetic uniformity.
Investigations Of The Troglobitic Crayfish Orconectes Inermis Testii (Hay) In Mayfield's Cave, Monroe County, Indiana, H. H. Hobbs Iii
Investigations Of The Troglobitic Crayfish Orconectes Inermis Testii (Hay) In Mayfield's Cave, Monroe County, Indiana, H. H. Hobbs Iii
International Journal of Speleology
Mark-recapture studies of some aspects of the biology of the cavernicolous crayfish, Orconectes inermis testii (Hay), were conducted from December, 1969 to March, 1970, in Mayfield’s Cave, Monroe County, Indiana. Population size was estimated to be 66 +/- 9 (95% C.L.) for the 300 m study area, but because of the small sample size, this is undoubtedly a deflated value. Size of animals, expressed as total length, indicates that the population was comprised primarily of adults. Seventy-four percent of the marked crayfish moved no more than 10.5 m away (total upstream and downstream distances) from the tagging site. Hence, this …
International Symposium On Groundwater Biology: Introduction, John R. Holsinger, Arthur L. Buikema Jr.
International Symposium On Groundwater Biology: Introduction, John R. Holsinger, Arthur L. Buikema Jr.
International Journal of Speleology
Short presentation of the Symposium on Groundwater.
Variation Among Populations Of The Troglobitic Amphipod Crustacean Crangonyx Antennatus Packard (Crangonyctidae) Living In Different Habitats, Iii: Population Dynamics And Stability, Gary W. Dickson, John R. Holsinger
Variation Among Populations Of The Troglobitic Amphipod Crustacean Crangonyx Antennatus Packard (Crangonyctidae) Living In Different Habitats, Iii: Population Dynamics And Stability, Gary W. Dickson, John R. Holsinger
International Journal of Speleology
Populations of the troglobitic amphipod Crangonyx antennatus from caves in Lee Co., Virginia (U.S.A.) were investigated on both a short and long term basis. The dynamics of populations living in two distinct aquatic cave habitats (mud-bottom pools and gravel-bottom streams) were compared seasonably for one year. Sex ratios indicated a larger number of females in both pool and stream habitats. The majority of males in both habitats were found to be sexually mature throughout the year investigated. Seasonal fluctuations in female maturity were observed in both habitats, with larger numbers collected in June and August. In addition, a larger number …
Genetic Population Structure In An Amphipod Species, James L. Gooch, S. W. Golladay
Genetic Population Structure In An Amphipod Species, James L. Gooch, S. W. Golladay
International Journal of Speleology
Genetic structure of a species should conform, in part, to environmental structure. Three polymorphic enzyme loci in the amphipod Gammarus minus Say are geographically differentiated in gene frequencies in the mid-Appalachian Mountains of the eastern United States, and genetic breaks usually coincide with topographical features and stream divides. Considering alleles as migrational markers, it is expected that heterozygosity would decrease upstream in isolated drainage basins, increase in the headwaters of adjacent but oppositely flowing streams in which gene exchange was occurring between genetically differentiated populations, and increase in sites near regional master streams. These genetic patterns were found to exist …
Some Implications Of Competition For Cave Stream Communities, David C. Culver
Some Implications Of Competition For Cave Stream Communities, David C. Culver
International Journal of Speleology
Based on recent theoretical work by Robert May and Richard Levins, two hypotheses about time fluctuations in abundance of competing species were generated. Data for isopods and amphipods from four cave stream communities in Virginia and West Virginia were used to test the predictions. First, variance of total abundance should be less than the sum of the variances of individual species’ abundances. In three of four communities studied, the prediction was confirmed, but none were statistically significant. Positive correlations among carrying capacities of competing species may explain the poor agreement with predictions. Second, the signs of 19 correlations and partial …
Distribution Of Ostracods In The Groundwater Of The North Western Coast Of Euboea (Greece), Dan L. Danielopol
Distribution Of Ostracods In The Groundwater Of The North Western Coast Of Euboea (Greece), Dan L. Danielopol
International Journal of Speleology
Freshwater fauna from 20 wells located 15-200 m from the seashore as well as marine interstitial fauna from the coastal zone around the village Aghios Georghios (Cape Likhada) have been investigated. Freshwater hypogean ostracods live mainly in protected wells having clean bottom and little particulate organic matter from which the water is moderately pumped. Epigean freshwater ostracods dominate in unprotected wells with large amounts of organic matter on the bottom. There is a sharp difference between the ostracod fauna living in fresh groundwater (mainly Cypridids) and those living in coastal marine interstitial habitats (marine Cytherids and Polycopids). It is suggested …
The Edwards Aquifer: Earth's Most Diverse Groundwater Ecosystem?, Glenn Longley
The Edwards Aquifer: Earth's Most Diverse Groundwater Ecosystem?, Glenn Longley
International Journal of Speleology
Recent studies on the Edwards Aquifer, a karstic formed cavernous system in Texas, indicate an extremely diverse community of aquatic troglobites. Sampling of wells and springs is providing new insight into the dynamics of this fascinating system, which is possibly the most diverse subterranean aquatic ecosystem known in the world today.
Perspectives In The Study Of The Zoogeography Of Interstitial Crustacea: Bathynellacea (Syncarida) And Parastenocarididae (Copepoda), Horst Kurt Schminke
Perspectives In The Study Of The Zoogeography Of Interstitial Crustacea: Bathynellacea (Syncarida) And Parastenocarididae (Copepoda), Horst Kurt Schminke
International Journal of Speleology
Aspects of the zoogeography of Bathynellacea and Parastenocarididae are discussed in the light of my recent investigations. Parastenocarididae in Australia are rare and not very diverse in number of species. Four species belonging to three genera were collected on a tour through Australia in 1968. Despite relationships to species from other Gondwanian landmasses the poorness of the Australian fauna, together with the apparent ability of this family to spread over longer distances, suggest a late arrival of Parastenocarididae in Australia. Invasion is likely to have taken place from two directions. As for the Bathynellacea, the relationships presumed to exist between …
Investigation Of The Mutual Influence Between A Polluted River And Its Hyporheic, Milan Meŝtrov, Romana Lattinger-Penko
Investigation Of The Mutual Influence Between A Polluted River And Its Hyporheic, Milan Meŝtrov, Romana Lattinger-Penko
International Journal of Speleology
This paper describes investigations of fundamental biological and pratical importance. Interstitial subterranean water (hyporheic) which is near a polluted river in a plain is the subject of the study. The water is becoming increasingly important as a source of drinking water. The relation of the hyporheic water to the physical, chemical, bacteriological and faunistic characteristics of the river is discussed.
Distribution And Habitat Diversity Of Subterranean Amphipods In The Rocky Mountains Of Colorado, U. S. A., James V. Ward, John R. Holsinger
Distribution And Habitat Diversity Of Subterranean Amphipods In The Rocky Mountains Of Colorado, U. S. A., James V. Ward, John R. Holsinger
International Journal of Speleology
Subterranean amphipods have been collected from 35 locations on the eastern and western slopes of the Continental Divide in Colorado. All belong to the exclusively subterranean genus Stygobromus. Five species have been identified, two of which are undescribed. Specimens have been collected from (a) the hyporheic zone of rivers, (b) interrupted streams, (c) springs, and (d) seeps at elevations from 1597-2134 m a.s.l. Stygobromus occurs in several habitat types in interrupted drainage basins including sources, seeps, and isolated pools containing leaf detritus. All habitats contained waters which were cool to cold with dissolved oxygen values ranging from 4.3 ppm …
Geology Newsletter- 1980, Department Of Geology
Geology Newsletter- 1980, Department Of Geology
Geological and Environmental Sciences News
Vol. 1. No. 5
- Dear Alumni and Friends
- Alumni News
The Distribution Of Cesium-137, Copper, Lead And Zinc In Various Sedimentary Environments Of The James River Estuary, Virginia, Colin Stevenson Moy
The Distribution Of Cesium-137, Copper, Lead And Zinc In Various Sedimentary Environments Of The James River Estuary, Virginia, Colin Stevenson Moy
OES Theses and Dissertations
Ten grab samples and eight cores were obtained within a short stretch of the James River estuary. The distribution of CU, Pb, Zn, Cs-137, organic carbon (TOC) and fine-grained sediments in various depositional environments were examined. Within the past quarter of a century, these measured parameters have been accumulating preferentially in the low energy environment (Burwell Bay). The inventory of Cs-137 in the cores was linearly related to the inventory of heavy metals and TOC. The concentrations of Cs-137 in the surface sediments vary linearly to those of the other parameters suggesting that Cs-137 may be used as a tracer …
Epa Profile Of Environmental Quality Nebraska, Kathleen Q. Camin
Epa Profile Of Environmental Quality Nebraska, Kathleen Q. Camin
United States Environmental Protection Agency: Publications
Nebraska, Iowa, Kansas, and Missouri, which make up EPA Region VII, are among the leading corn and wheat producing States in the Nation_ These States also produce a significant share of the soybean, grain sorghum, fat cattle, and finished hogs that are supplied to American and foreign markets.
Although the States in Region VII can best be characterized as rural, 65 percent of their nearly 12 million people live in urban areas. In Nebraska, metropolitan areas such as Omaha 4 have environmental problems resulting from major industrial operations, municipal services, transportation, and energy production. Metropolitan areas, however, do not have …
Use Of Annual Legumes As Winter Cover For No-Till Corn, Robert L. Blevins
Use Of Annual Legumes As Winter Cover For No-Till Corn, Robert L. Blevins
Soil Science News and Views
Legumes in crop rotations hsve traditionally provided nitrogen for nonlegume crops since the early history of agriculture. When in association with the proper strains of Rhyzobium bacteria, legumes are capable of fixing atmospheric nitrogen, which when residues from the legumes decompose, enrich the soil content of nitrogen. Legume cover crops recycle other nutrients, thus reducing leaching losses that often occur in soils during the winter and spring seasons. In addition to these advantages, legume cover crops used with no-tillage corn provide a surface mulch which reduces soil erosion, slows evaporation of soil moisture, increases infiltration of rainfall, and increases soil …
Variations In The Depositional Environment Of The Lower Cincinnatian Kope Formation, Thomas K. Mahan
Variations In The Depositional Environment Of The Lower Cincinnatian Kope Formation, Thomas K. Mahan
Masters Theses
In northern Kentucky, the Upper Ordovician (Lower Cincinnatian) Kope Formation outcrops as a series of interbedded, laterally discontinuous limestone lenses and beds enclosed in a silty shale unit. Six stratigraphic sections within a 20-mile radius were sampled and measured and two of these were described in detail to characterize the variations in the environmental setting wherein the Kope Formation was deposited.
The shale lithology is homogeneous throughout this formation whereas the bioclastic limestones vary widely in faunal composition, texture, cross-sectional shape, and thickness. Apparently, the depositional style for the fine-grained, terrigenous sediment remained almost constant through Early Cincinnatian time, whereas …
The Surface Mining Control And Reclamation Act Of 1977, Hamlet J. Barry, Iii
The Surface Mining Control And Reclamation Act Of 1977, Hamlet J. Barry, Iii
Federal Lands, Laws and Policies and the Development of Natural Resources: A Short Course (Summer Conference, July 28-August 1)
48 pages.
Includes footnotes (pages 44 to 47).
The Effects Of Elevated Calcium Chloride And Magnesium Chloride Levels On Larval Growth And Survival Of Macrobrachium Rosenbergii (De Man) (Decapoda Palaemonidae) Reared In The Laboratory, James Thomas Michaels Ii
The Effects Of Elevated Calcium Chloride And Magnesium Chloride Levels On Larval Growth And Survival Of Macrobrachium Rosenbergii (De Man) (Decapoda Palaemonidae) Reared In The Laboratory, James Thomas Michaels Ii
OES Theses and Dissertations
The effects of elevated CaCl2 , MgCl2 , combination CaCl2 and MgCl2 concentrations and their associated ionic strengths on larval growth and survival of the freshwater prawn, Macrobrachium rosenbergii were investigated in the laboratory. Larvae were reared in diluted seawater of 15 parts per thousand salinity with elevated calcium concentrations of 330 parts per million and elevated magnesium concentrations of 1275 parts per million. Control larvae were also reared with elevated NaCl concentrations to duplicate the ionic strength increases of the combination CaCl2 - MgCl2 test solution which had the highest ionic strength. A …
Relationship Of Tecate Cypress Distribution To Soil Types, David E. Stottlemyer
Relationship Of Tecate Cypress Distribution To Soil Types, David E. Stottlemyer
Loma Linda University Electronic Theses, Dissertations & Projects
The Tecate Cypress (Cupressus forbesii Jeps.) is a gymnosperm tree of limited distribution. To determine if soil is an influencing factor in its distribution, the soil characteristics of a Tecate Cypress grove in the Santa Ana Mountains of Orange County, California, were compared with soils from neighboring communities and other Tecate Cypress groves. Soil samples were analyzed for texture, saturation percent, pH, and electrical conductivity. Tests were also run for nutrients such as nitrogen, phosphorus, potassium, calcium, magnesium, iron, manganese, copper and zinc.
Results seem to indicate that the Tecate Cypress soils are: 1) significantly more acidic than the soils …
Influence Of Las Vegas Wash Density Current On Nutrient Availability And Phytoplankton Growth In Lake Mead, John R. Baker, Larry J. Paulson
Influence Of Las Vegas Wash Density Current On Nutrient Availability And Phytoplankton Growth In Lake Mead, John R. Baker, Larry J. Paulson
Publications (WR)
Density currents are commonly formed in reservoirs because of temperature or salinity induced density differences between inflowing and receiving waters. Anderson and Pritchard (1951) were among the first to demonstrate this in their investigations of density currents in Lake Mead. They found that the Colorado River formed an underflow in Lake Mead during the winter, an overflow in the spring and an interflow in the summer and fall. Wunderlich and Elder (1973) have since described the hydromechanics of these types of flow patterns, and density currents have been reported for several other large reservoirs (Carmack et al. 1979, Johnson and …
Characteristics And Genesis Of Certain Soils In The Southern Foothills Of Central Alborz, Iran, Firouz Rooyani
Characteristics And Genesis Of Certain Soils In The Southern Foothills Of Central Alborz, Iran, Firouz Rooyani
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Characteristics and genesis of five pedons representing some of the soils of the central Alborz mountain northeast of Tehran were investigated. The present climate of the area is similar to the Mediterranean climate. The parent materials for the soils under study have apparently been derived from the Ecocene Alborz Green Beds (a thinly bedded light green mudstone), the Pliocene Hezardareh Formation (a poorly-cemented conglomerate) and Recent alluvium and colluvium. Pedons 2 and 4 are located at lower elevations (plain and river terraces) on 1 to 2 percent slopes. Pedons 3 and 5 are located at higher elevations (hills that surround …
Annotated Biobliography Of Remote Sensing For Highway Planning And Natural Resources, An, Daniel L. Civco, William C. Kennard, Michael Wm. Lefor
Annotated Biobliography Of Remote Sensing For Highway Planning And Natural Resources, An, Daniel L. Civco, William C. Kennard, Michael Wm. Lefor
Storrs Agricultural Experiment Station
No abstract provided.
Liverpool University Expedition To Jamaica, Donald A. Mcfarlane
Liverpool University Expedition To Jamaica, Donald A. Mcfarlane
WM Keck Science Faculty Papers
During summer 1977, five members of the Liverpool University Potholing Club spent six weeks working and exploring in the caves of Jamaica. The team consisted of Don McFarlane, John Dye, Malcolm Macduff, Mike Roger and Barry Williams, all of whom contributed to this report. The expedition base was at Troy, where the villagers are owed a debt of gratitude for their hospitality. This placed the expedition in the heart of the cave region, and a number of new caves and shafts were discovered and explored. The main discovery was the Still Waters Cave, located near Accompong, where 11,800 feet of …
Botanical And Ecological Aspects Of Coastal Raised Peatlands In Maine : And Their Relevance To The Critical Areas Program Of The State Planning Office, Ian A. Worley
Maine Collection
Botanical and Ecological Aspects of Coastal Raised Peatlands in Maine : and Their Relevance to the Critical Areas Program of the State Planning Office.
by Ian A. Worley
A Report Prepared for the Maine Critical Areas Program, State Planning Office, 184 State Street, Augusta, Maine 04333.
Planning Report No. 69 (January 1980)
Contents: Foreword / Abstract / Table of Contents / List of Figures / List of Tables / Acknowledgements / Introduction / Natural History and Ecology of the Coastal Raised Peatlands / Selection of Coastal Peatlands Recommended for Evaluation by the Critical Areas Program / General Evaluation of Coastal …
A Statistical Analysis Of The Quality Of Surface Water In Nebraska, R. A. Engberg
A Statistical Analysis Of The Quality Of Surface Water In Nebraska, R. A. Engberg
United States Geological Survey: Publications
This report provides descriptive statistics for 29 chemical or biological constituents for 109 stream sites in Nebraska sampled by the U.S. Geological Survey beginning in 1946. Also provided for each site are regression equations relating specific conductance to each of 12 chemical constituents and a regression equation relating specific conductance to stream discharge. The descriptive statistics are presented by river basins. Water leaving these basins that has the lowest mean specific conductance (266 umho/cm) is from the Niobrara River at Verdel, and water that has the highest (1,890 umho/cm) is from the South Platte River at Roscoe. Statewide, the principal …
A Limnological Study Of 43 Selected Maine Lakes, Derrill J. Cowing, Matthew Scott
A Limnological Study Of 43 Selected Maine Lakes, Derrill J. Cowing, Matthew Scott
Maine Collection
A Limnological Study of 43 Selected Maine Lakes
by Derrill J. Cowing and Matthew Scott
U.S. Geological Survey : Water-Resources Investigations 80-69
Prepared in cooperation with the Maine Department of Environmental Protection
U.S. Geological Survey, 26 Ganneston Drive, August, Maine 04330
Postglacial Ostracod Distribution And Paleoecology, Devils Lake Basin, Northeastern North Dakota, James B. Van Alstine
Postglacial Ostracod Distribution And Paleoecology, Devils Lake Basin, Northeastern North Dakota, James B. Van Alstine
Theses and Dissertations
Sediment cores were taken from Main Bay and Creel Bay of Devils Lake (in 1975 and 1976) and East Devils Lake (in 1978), within the Devils Lake basin, and from Red Willow Lake (in 1979), a control lake outside of the Devils Lake basin, northeastern North Dakota. The cores were sampled, for the recovery of the ostracods, at 10-cm intervals. Fifteen species of ostracods were present in the studied cores: 8 candonids, 1 cyclocyprid, 3 cyprids, and 3 limnocytherids. Two distinct faunas are recognized. The Devils Lake-East Devils Lake fauna consists of Candona lactea, C. rawsoni, Cyprinotus glaucus, Potamocypris smaragdina, …
Fossil Algae In The St. Louis Limestone, Near St. Louis, Missouri, Sherris Ragsdale Myers
Fossil Algae In The St. Louis Limestone, Near St. Louis, Missouri, Sherris Ragsdale Myers
Masters Theses
"Although Mississippian algae research is fairly extensive, little has been published on algae from the Mississippian type locality, the Upper Mississippi River Valley. For this study, portions of sixteen St. Louis Limestone stratigraphic sections containing units with oncolites, domal stromatolites, laminations, or mottled (possibly algal) textures, were measured, described, and sampled to determine: (1) to what extent algae are preserved in the St. Louis Limestone, (2) if enough of the delicate structure was fossilized to determine morphology, (3) depositional environment of the algae, and (4) if the algae are related to a lithologic pattern. Thin sections of the sampled units …