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Articles 421 - 450 of 721
Full-Text Articles in Aquaculture and Fisheries
Relationship Of Hydrological Conditions And Populations Of Breeding Piping Plovers, Daniel S. Licht
Relationship Of Hydrological Conditions And Populations Of Breeding Piping Plovers, Daniel S. Licht
United States Fish and Wildlife Service: Publications
I used hydrological data and surveys of breeding piping plover (Charadrius melodus) from 1988 to 1997 to assess the relationship of water levels to piping plover breeding distribution, abundance, and habitat use in North Dakota. Piping plover abundance at wetlands surveyed in all years (n = 48) increased significantly as wetness increased (r = 0.93, P < 0.001). However, individual wetland sites often differed in their response to hydrological conditions with some sites showing significant decreases in piping plover abundance during wet periods. The abundance of piping plovers using the Missouri River system (Oahe and Sakakawea reservoirs and the free-flowing reaches of the river) correlated strongly with upland populations of piping plovers during periods of below-average water levels in the riverine system; however, once water levels within the Missouri River system reach a certain point the relationship turned negative with river populations·of piping plovers decreasing and upland populations of piping plovers increasing.
Validation Of Three Back-Calculation Models By Using Multiple Oxytetracycline Marks Formed In The Otoliths And Scales Of Bluegill × Green Sunfish Hybrids, Robert A. Klumb, Michael A. Bozek, Richard V. Frie
Validation Of Three Back-Calculation Models By Using Multiple Oxytetracycline Marks Formed In The Otoliths And Scales Of Bluegill × Green Sunfish Hybrids, Robert A. Klumb, Michael A. Bozek, Richard V. Frie
United States Fish and Wildlife Service: Publications
We assessed the accuracy of the Fraser–Lee, biological-intercept, and Weisberg back-calculation models to estimate growth from otoliths and scales of laboratory-reared juvenile bluegill × green sunfish hybrids (Lepomis macrochirus × Lepomis cyanellus). Hybrid sunfish were injected three times with oxytetracycline hydrochloride at 90- day intervals to mark bony structures, creating simulated annuli for model validation. Back-calculated lengths (BCLs) with otoliths were generally less accurate than scales for all three models. Errors ranged from –8.2 to 7.8% for the Fraser–Lee model, from –8.0 to 8.3% for the biological-intercept model, and from –6.5 to 14.3% for the Weisberg model. For …
Trace Element Concentrations In Plants And Sediments At Crescent Lake National Wildlife Refuge, Karen J. Nelson, Brent J. Esmoil
Trace Element Concentrations In Plants And Sediments At Crescent Lake National Wildlife Refuge, Karen J. Nelson, Brent J. Esmoil
United States Fish and Wildlife Service: Publications
Crescent Lake National Wildlife Refuge (NWR) is located in the Sandhills of western Nebraska, an area which contains the largest remaining tract of mid-grass and tall-grass prairie in North America. Land use surrounding the refuge is dominated by rangeland and land use practices likely result in minimal inputs of point or non-point source pollution. Industrial development in the area is minimal and the refuge complex is believed to be in fairly pristine condition. The use of persistent organochlorine pesticides on the refuge has been limited. The objectives of this study were to determine background concentrations of metals in biotic and …
Yellow Jackets (Vespula Spp.) Disperse Trillium (Spp.) Seeds In Eastern North America, Jennifer A. Zettler, Timonthy P. Spira, Craig R. Allen
Yellow Jackets (Vespula Spp.) Disperse Trillium (Spp.) Seeds In Eastern North America, Jennifer A. Zettler, Timonthy P. Spira, Craig R. Allen
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Approximately 70 plant families worldwide have ant-dispersed seeds (myrmecochory). In this putative ant-plant mutualism, ants are attracted to and disperse seeds that have a lipid-rich elaiosome. We observed yellow jackets (Vespula spp.) dispersing seeds of three elaiosome-bearing species-Trillium cuneatum, T. undulatum and T catesbaei-in the Blue Ridge Mountains of North Carolina and South Carolina. Moreover, we estimated the mean distance yellow jackets dispersed seeds of T. cuneatum by placing intact fruits on index cards and recovering dispersed seeds on sheets placed on the ground surface. Of the seeds presented, 41% were recovered and the average dispersal distance …
Saratoga National Fish Hatchery, Wyoming: Restoring America’S Fisheries
Saratoga National Fish Hatchery, Wyoming: Restoring America’S Fisheries
United States Fish and Wildlife Service: Publications
Saratoga NFH, established in 1911, has served as an egg-producing station during most of its years of operation. Between 1915 and 1984, various strains of brook, rainbow, brown, golden and cutthroat trout and Dolly Varden eggs were produced. In 1966, Saratoga NFH was formally designated as a broodstock hatchery, and in 1984 the hatchery became involved in the Great Lakes lake trout recovery program. Today, the hatchery's broodstock program includes supplying about 5 million eyed Lewis Lake lake trout eggs to the Great Lakes restoration program and 3 to 4 million Plymouth Rock brown trout eggs for Service, State, and …
Fish Survey Of Nathan's Lake, Boyer Chute National Wildlife Refuge, Corey Lee, William Davison
Fish Survey Of Nathan's Lake, Boyer Chute National Wildlife Refuge, Corey Lee, William Davison
United States Fish and Wildlife Service: Publications
The Columbia Fishery Resources Office conducted fish surveys at Nathan's Lake, a proposed component of Boyer Chute National Wildlife Refuge (NWR), in June 2001. Boyer Chute NWR is located in the Missouri River Floodplain about three miles north or Omaha, NE and four miles southeast of Ft. Calhoun, NE.
Nathan's Lake is located about one mile southwest of Boyer Chute (Figure 1) in Washington County and is connected to the Missouri River by a drainage ditch with a control structure located at the northeast corner of the lake, Nathan's Lake is approximately a 50-acre shallow lake (0.61-1.22-m) that contains aquatic …
Ennis National Fish Hatchery, Montana Restoring America’S Fisheries
Ennis National Fish Hatchery, Montana Restoring America’S Fisheries
United States Fish and Wildlife Service: Publications
Established in 1981, Ennis NFH was located for the purpose of taking trout eggs from wild populations, and introducing fingerling fish back into public waters to sustain and enhance the sport fishery. The site was selected for the fractured rock out-cropping which gravity flows 15,000 gallons per minute of 54 °F spring waters; the ideal environmnet for producing trout.
In the 1970's the demand for catching trout decreased, but the demand for eggs increased. More emphasis was placed on broodstock and by the mid-80's production exceeded 20 million eggs. Today Ennis NFH operates as a federal broodstock hatchery and produces …
Review Of The Historical And Present Status Of The Lesser Prairie-Chicken (Tympanuchus Pallidicinctus) In Texas, Robert M. Sullivan, John P. Hughes, James E. Lionberger
Review Of The Historical And Present Status Of The Lesser Prairie-Chicken (Tympanuchus Pallidicinctus) In Texas, Robert M. Sullivan, John P. Hughes, James E. Lionberger
United States Fish and Wildlife Service: Publications
Historically, the lesser prairie-chicken (Tympanuchus pallidicinctus) occurred in sandy rangeland throughout the northeastern and southwestern (Permian Basin) regions of the Texas Panhandle. Analyses of the historical distribution showed a large reduction in the range of the species in Texas between 1963 and 1980 (78% or 1,070,426 ha), particularly in the southwestern and east-central panhandle, whereas populations in the northeastern Panhandle remained relatively stable. In the northeastern Panhandle, average number of males per lek increased since 1942. In the southwestern Panhandle, average numbers of males per lek decreased dramatically from 1969 to 1981 and from 1985 to 2000, but …
Creston National Fish Hatchery, Montana Restoring America’S Fisheries
Creston National Fish Hatchery, Montana Restoring America’S Fisheries
United States Fish and Wildlife Service: Publications
The National Fish Hatchery System (NFHS) is comprised of 70 Fish Hatcheries, 7 Fish Technology Centers, and 9 Fish Health Centers nation wide. The NFHS operated by the U.S. Fish and Wildlife Service has a unique responsibility in helping restore native aquatic populations, mitigate for fisheries lost as a result of federal water projects, provide fish to benefit Tribes and the National Wildlife Refuges, and to recover species listed under the Endangered Species Act. The NFHS works closely with other programs in the Service and with the States, Tribes, and the private sector to complement habitat restoration and other resource …
D.C. Booth Historic National Fish Hatchery, South Dakota Restoring America’S Fisheries
D.C. Booth Historic National Fish Hatchery, South Dakota Restoring America’S Fisheries
United States Fish and Wildlife Service: Publications
Established in 1896, DC Booth Historic NFH, formerly Spearfish NFH, is one of the oldest operating hatcheries in the country dedicated to fish culture and resource management. The hatchery was constructed to propagate, stock, and establish trout populations in the Black Hills of South Dakota and Wyoming. After a very successful fish production history, the hatchery ceased operations in the mid-80's and reopened with a new mission and partnership to help preserve the U.S. Fish and Wildlife Service's historic and cultural heritage.
Today, DC Booth Historic NFH serves as a living fishery museum to the public and many organizations. Still …
Hotchkiss National Fish Hatchery, Colorado Restoring America’S Fisheries
Hotchkiss National Fish Hatchery, Colorado Restoring America’S Fisheries
United States Fish and Wildlife Service: Publications
Hotchkiss NFH was established in 1967 as part of the Colorado River Storage Project Act. Located on 59 acres of forest surroundings on the North Fork of the Gunnison River, the hatchery's cold, clean water supply comes from the adjacent Tommy Dowell Spring.
Tommy Dowell Spring was created in the 1930's by an earthquake near Salt Lake City, whose tremors also affected the Hotchkiss area. The spring has a constant water temperature of 56 °F and flows from 2,200 to 5,000 gallons per minute, providing the ideal conditions for trout production.
Currently, the hatchery is rearing rainbow trout for stocking …
Horse Creek Fen, Birdwood Creek And Kelly Ranch Inventory, Robert F. Steinauer
Horse Creek Fen, Birdwood Creek And Kelly Ranch Inventory, Robert F. Steinauer
Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts
Horse Creek Fen preserve is a complex of wetland communities (Sandhills fen, Sandhills freshwater marsh, and northern sedge wet meadow) associated with Horse Creek, a ditched stream that drains the Allen Valley fen. Fen vegetation on the preserve is limited to approximately 20 acres on the western boundary of the preserve where it abuts the eastern end of the Allen Valley fen (Steinauer et al. 1996). The fen vegetation is surrounded primarily by Sandhills freshwater marsh, which in turn is surrounded by northern sedge wet meadow. Additional Sandhills freshwater marsh occurs near the eastern boundary of the preserve. The eastern …
Desarrollo De Tecnologias De Acuacultura Semi-Intensiva En Honduras: Resumen De Las Investigaciones En Acuacultura De Agua Dulce Realizadas Por El Programa Colaborativo De Apoyo A La Investigacion En Acuacultura/Dinamica De Estanques (Pd/A Crsp) De 1983 A 1992, Bartholomew Green, David Teichert-Coddington, Terrill Hanson
Desarrollo De Tecnologias De Acuacultura Semi-Intensiva En Honduras: Resumen De Las Investigaciones En Acuacultura De Agua Dulce Realizadas Por El Programa Colaborativo De Apoyo A La Investigacion En Acuacultura/Dinamica De Estanques (Pd/A Crsp) De 1983 A 1992, Bartholomew Green, David Teichert-Coddington, Terrill Hanson
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
La investigacion en acuacultura en Honduras se ha desarrollado desde 1983 en una manera colaborativa por medio del Centro Internacional de Acuacultura y Medio Ambientes Acuaticos, Universidad de Auburn, y la Direccion General de Pesca y Acuacultura, Secretaria de Agricultura y Ganaderia, Republica de Honduras. Estas investigaciones de llevaron a cabo en el Centro Nacional de Investigacion Piscicola El Carao, Comayagua, Honduras, bajo el auspicio del Programa Colaborativo de Investigaion en Acuacultura/Dinamica de Estanques (PD/A CRSP), el cual esta financiado por USAID. La meta principal de PD/A CRSP es incremntar la produccion de tilapia por medio de la optimizacion de …
Reproductive Success Of Piping Plovers On Alkali Lakes In North Dakota And Montana, Robert K. Murphy, Michael J. Rabenberg, Marriah L. Sondreal, Bruce R. Casler, Debra A. Guenther
Reproductive Success Of Piping Plovers On Alkali Lakes In North Dakota And Montana, Robert K. Murphy, Michael J. Rabenberg, Marriah L. Sondreal, Bruce R. Casler, Debra A. Guenther
United States Fish and Wildlife Service: Publications
Low reproductive success is thought to be a chief cause of the steady decline in numbers of piping plover (Charadrius melodus) that nest in the northern Great Plains. Surprisingly, few reproductive success data are published from alkali lakes in the region, where most breeding pairs of piping plover nest. During 1994 to 1997 we measured nest success and fledging rates of piping plovers at 32 alkali lakes across northwestern North Dakota and northeastern Montana, at the center of the species' breeding range in the Great Plains. Annual nest success and fledging rates averaged 38% (Mayfield estimate; 20 to …
Biography: Glenn Lyle Hoffman, Andrew J. Mitchell
Biography: Glenn Lyle Hoffman, Andrew J. Mitchell
United States Fish and Wildlife Service: Publications
Glenn Lyle Hoffman, the son of Ernest J. and Viola M. Hoffman, was born on a small farm in Iowa on December 28, 1918. He is a graduate of Lamont High School in Iowa where he excelled at wrestling. In 1942, he received a B.A. Degree from the University of Iowa, majoring in Zoology. He paid his own way through college by trapping fur animals, washing hospital windows, and working summers at a trout hatchery for the Iowa Department of Natural Resources.
Review Of Parasites Of North American Freshwater Fishes, Second Edition, Wilmer A. Rodgers
Review Of Parasites Of North American Freshwater Fishes, Second Edition, Wilmer A. Rodgers
United States Fish and Wildlife Service: Publications
In this second edition, the author uses the traditional better-known taxonomy, although a table listing the contemporary (or future) classification is presented in the foreword. The beginning of the book covers the public health aspects of fish parasites, and discusses methods of examining and collecting fish, and then preserving and making permanent preparations. These sections will be very helpful to students and researchers, as are the sections that list parasites by location in fish. The next sections present major groups of parasites and detailed genera and species. Drawings and photographs make identification relatively easy. An important addition to this second …
Non-Native Species Interactions: Management Implications To Aid In Recovery Of The Colorado Pikeminnow Ptychocheilus Lucius And Razorback Sucker Xyrauchen Texanus In The San Juan River, Co-Nm-Ut, James E. Brooks, Michael J. Buntjer, Jude R. Smith
Non-Native Species Interactions: Management Implications To Aid In Recovery Of The Colorado Pikeminnow Ptychocheilus Lucius And Razorback Sucker Xyrauchen Texanus In The San Juan River, Co-Nm-Ut, James E. Brooks, Michael J. Buntjer, Jude R. Smith
United States Fish and Wildlife Service: Publications
As part of the San Juan River Basin Recovery Implementation Program (SJRIP), investigations of non-native fishes were conducted during 1991-1997 to characterize interactions with native fishes. The impacts of non-native fish species on natives has often been identified as a key impact, along with habitat alteration, that facilitates loss of native biological diversity. In the San Juan River, the endangered Colorado pikeminnow Ptychocheilus lucius and razorback sucker Xyrauchen texanus, as well as the other members of the native fish community, are the focus of the SJRIP. A major component of native fish recovery efforts in the San Juan River …
Contaminant Residue Analysis Of Fish Tissues From Marais Des Cygnes National Wildlife Refuge - Kansas, John F. Miesner
Contaminant Residue Analysis Of Fish Tissues From Marais Des Cygnes National Wildlife Refuge - Kansas, John F. Miesner
United States Fish and Wildlife Service: Publications
Marais des Cygnes National Wildlife Refuge (Refuge) was added to the National Wildlife Refuge system in 1992. The Refuge occupies approximately 2,550 ha of bottomland hardwoods habitats along the Marais des Cygnes River in Linn County, Kansas.
During public involvement in acquisition planning, the Service committed to opening the Refuge to recreational fishing. There are several water bodies on the Refuge which would provide recreational fishing opportunities. These include abandoned coal strip mines, small man-made farm ponds, and the Marais des Cygnes River and several tributaries to the river. Fish have been established in the coal mine and farm ponds …
Effects To Listed Species From Operations Of The Federal Columbia River Power System
Effects To Listed Species From Operations Of The Federal Columbia River Power System
United States Fish and Wildlife Service: Publications
The U.S. Fish and Wildlife Service (Service) has reviewed the biological assessment (BA) and National Environmental Policy Act (NEPA) documents dated December, 1999 submitted by the Bonneville Power Administration (BPA), Corps of Engineers (Corps), and the Bureau of Reclamation (Bureau) (also referred to as action agencies) regarding operations of the Federal Columbia River Power System (FCRPS). The action agencies’ request for formal consultation was received in December, 1999. This document represents the Service’s biological opinion of the effects of the proposed action on two listed fish species: the endangered Kootenai River white sturgeon (Acipenser transmontanus); and the threatened …
Review Of Parasites Of North American Freshwater Fishes, Second Edition, Gerald W. Esch
Review Of Parasites Of North American Freshwater Fishes, Second Edition, Gerald W. Esch
United States Fish and Wildlife Service: Publications
Thirty-two years ago, Glenn Hoffman published the first version of this book. I remember it well because I was teaching a field parasitology course at the W.K. Kellogg Biological Station of Michigan State University, and depended to a very great extent on various fish parasites to use for examples in class study. As a result, the book was canonical as a source of information, and it continued to serve me well as I moved elsewhere in subsequent years. I know from personal knowledge that others who worked with fish parasites were equally served by the book. My copy of the …
Selenium In A Wyoming Grassland Community Receiving Wastewater From An In Situ Uranium Mine, Pedro Ramirez Jr., Brad Rodgers
Selenium In A Wyoming Grassland Community Receiving Wastewater From An In Situ Uranium Mine, Pedro Ramirez Jr., Brad Rodgers
United States Fish and Wildlife Service: Publications
Water, soil, vegetation, grasshoppers (Family Acrididae), bird eggs and bird livers collected at a 23.5 hectare (58 acres) grassland irrigated with wastewater from an in situ uranium mine (Study Area) and a reference site in 1998 were analyzed for selenium and other trace elements. Bird surveys were conducted at the irrigated grassland at the in situ uranium mine to determine species use, relative abundance and behavior. We observed 23 species of birds using the Study Area. Western meadowlarks (Sturnella neglecta), red-winged blackbirds (Agelaius phoeniceus), lark buntings (Calamospiza melanocorys) and horned larks (Eremophila alpestris …
Avian Mortality At Communication Towers: A Review Of Recent Literature, Research, And Methodology, Paul Kerlinger
Avian Mortality At Communication Towers: A Review Of Recent Literature, Research, And Methodology, Paul Kerlinger
United States Fish and Wildlife Service: Publications
A review of the recent literature and research in progress on bird collisions with
communication towers was contracted by the U. S. Fish and Wildlife Service. In the five year period 1995 through 1999, very little research was published or conducted that is relevant to the bird-communication tower collision problem. It seems that since the major reviews of the late 1970s and early 1980s, few researchers and others have been interested in researching the problem. Before 1985, there was an enormous body of literature, mostly anecdotal that has not been examined analytically.
For the current review,, a standard literature search …
Terrestrial Natural Communities Of Nebraska - Version Ii, Gerry Steinauer, Steven B. Rolfsmeier
Terrestrial Natural Communities Of Nebraska - Version Ii, Gerry Steinauer, Steven B. Rolfsmeier
Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts
For more than a decade, The Nature Conservancy (TNC) and state natural heritage programs, including the Nebraska Natural Heritage Program (NNHP), have used a “coarse filter/fine filter” approach to preserving biological diversity (The Nature Conservancy, 1994). This approach involves identification and protection of natural communities (coarse filter) as well as rare species (fine filter). Identifying and protecting representative examples of natural communities ensures conservation of most species, biotic interactions and ecological processes. Those species that “fall through” the community filters are generally the rare species. Identification and protection of viable occurrences of rare species serves as the fine filter for …
Conservation In A Highly Fragmented Landscape: The Central Tallgrass Prairie Ecoregional Conservation Plan, The Central Tallgrass Prairie Ecoregion Planning Team
Conservation In A Highly Fragmented Landscape: The Central Tallgrass Prairie Ecoregional Conservation Plan, The Central Tallgrass Prairie Ecoregion Planning Team
Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts
With the adoption of Conservation by Design in 1995, The Nature Conservancy recognized the importance of working at larger scales to achieve our mission which is: the long-term survival of all viable native species and community types through the design and conservation of portfolios of sites within ecoregions. The Conservancy set forth to design conservation plans on an ecoregional basis by working closely with various conservation partners. These plans are intended to provide a framework within which the Conservancy and our partners, such as the Natural Heritage Programs, can make decisions regarding conservation actions to be taken at the …
Briefing Book Nebraska
United States Fish and Wildlife Service: Publications
Table of Contents
U.S. Fish and Wildlife Service Presence in Nebraska
Boyer Chute National Wildlife Refuge
Crescent Lake / North Platte National Wildlife Refuge Complex
Fort Niobrara / Valentine /John and Louise Seier National Wildlife Refuge Complex
Rainwater Basin Wetland Management District and Sandhills Habitat Office
Partners for Fish and Wildlife (PFFW)
Ecological Services (ES) Field Office
Law Enforcement
North American Waterfowl Management Plan
Nebraska Federal Aid-- Sport Fish and Wildlife Restoration
Migratory Bird Conservation
Cassin’S Sparrow (Aimophila Cassinii) Status Assessment And Conservation Plan, Janet M. Ruth
Cassin’S Sparrow (Aimophila Cassinii) Status Assessment And Conservation Plan, Janet M. Ruth
United States Fish and Wildlife Service: Publications
Cassin’s Sparrow (Aimophila cassinii) is a grassland species endemic to the southwestern U.S. and northern Mexico. Its behavior and ecology have been shaped by these arid ecosystems and the health of its populations is dependent on the availability of grasslands that contain a shrub component. Populations of many grassland birds have experienced dramatic declines due to the loss and deterioration of grassland habitats, and there has been concern about the trends in Cassin’s Sparrow populations. Without better information about population trends, ecology, and effects of management activities, and without a stronger emphasis on grassland management, Cassin’s Sparrows and other grassland …
Fish Tales: More Trout To Catch In Utach Thanks To Federal-State Cooperation, John Seals, Tim Miles
Fish Tales: More Trout To Catch In Utach Thanks To Federal-State Cooperation, John Seals, Tim Miles
United States Fish and Wildlife Service: Publications
As reciprocity to Utah Department of Wildlife Resources (DWR) for its help last year feeding and hauling young fish, the Jones Hole National Fish Hatchery is providing more fish for Utah waters, which means more trout dinners for recreational anglers.
The DWR is currently busy hauling about 260,000 rainbow trout fingerlings – roughly 8600 pounds of fish – from Jones Hole to lakes throughout the state, including Steinaker Reservoir near Vernal, and Mantua and East Canyon Reservoirs near Ogden. About half of the fish are going into Scofield Reservoir in Carbon County, adding to 270,000 Jones Hole trout that were …
Canada Lynx Conservation Assessment And Strategy, Bill Ruediger, Jim Claar, Steve Mighton, Bob Naney, Tony Rinaldi, Fred Wahl, Nancy Warren, Dick Wenger, Al Williamson, Lyle Lewis, Bryon Holt, Gary Patton, Joel Trick, Anne Vandehey, Steve Gniadek
Canada Lynx Conservation Assessment And Strategy, Bill Ruediger, Jim Claar, Steve Mighton, Bob Naney, Tony Rinaldi, Fred Wahl, Nancy Warren, Dick Wenger, Al Williamson, Lyle Lewis, Bryon Holt, Gary Patton, Joel Trick, Anne Vandehey, Steve Gniadek
United States Fish and Wildlife Service: Publications
The Lynx Conservation Assessment and Strategy was developed to provide a consistent and effective approach to conserve Canada lynx on federal lands in the conterminous United States. The United States Department of Agriculture Forest Service, United States Department of the Interior Bureau of Land Management, and United States Department of the Interior Fish and Wildlife Service initiated the Lynx Conservation Strategy Action Plan in spring of 1998.
The lynx has been proposed for listing as a threatened species under the Endangered Species Act (Federal Register, Volume 63, No. 130, July 8, 1998). In the proposed rule, the U.S. Fish and …
Syncoelium Vermilionensis Sp. N., (Hemiuroidea: Syncoeliidae) And New Records For Members Of Azygiidae, Ptychogonimidae, And Syncoeliidae Parasitizing Elasmobranchs In The Gulf Of California, Stephen S. Curran, Robin M. Overstreet
Syncoelium Vermilionensis Sp. N., (Hemiuroidea: Syncoeliidae) And New Records For Members Of Azygiidae, Ptychogonimidae, And Syncoeliidae Parasitizing Elasmobranchs In The Gulf Of California, Stephen S. Curran, Robin M. Overstreet
Harold W. Manter Laboratory of Parasitology: Faculty Publications
During July-September 1993 and May 1996, a survey of the metazoan parasites of 817 elasmobranchs from the Gulf of California, representing 42 species, was conducted at 14 sites along the western portion of the Gulf of California. Elasmobranchs were obtained from local commercial fishers. In this paper, we report all digeneans collected during the survey, excluding the gorgoderids, which will be presented in a subsequent paper. Four species from three hemiuroid families were collected, none of which was known previously from the Gulf of California. Syncoelium vermilionensis sp. n. (Syncoeliidae), a species that differs most notably from its congeners by …
Intermediate Rings Between A Local Domain And Its Completion, William Heinzer, Christel Rotthaus, Sylvia Wiegand
Intermediate Rings Between A Local Domain And Its Completion, William Heinzer, Christel Rotthaus, Sylvia Wiegand
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We consider the structure of certain intermediate domains between a local Noetherian domain Rand an ideal-adic completion R* of R that arise as the intersection of R* with a field containing R. In the case where the intersection domain A can be expressed as a directed union of localized polynomial extension rings of R, the computation of A is easier. We examine conditions for this to happen. We also present examples to motivate and illustrate the concepts considered.