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Hormonal Interrelationships Between Hypothalamus, Pituitary And Testis Of Rams And Bulls, Bruce D. Schanbacher

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

This mini-review aims to summarize some of our recent findings relating to testicular function and feedback control of the hypothalamic-pituitary axis by testicular steroids in rams and bulls. Testosterone secretion in intact males is not tonic, but is characterized by episodic pulses. This pattern of secretion is dictated by inputs of the central nervous system via secretions of the hypothalamus (luteinizing hormone- releasing hormone; LHRH) and anterior pituitary (luteinizing hormone; LH). A temporal relationship exists between concentrations of LH and testosterone in serum and evidence is presented that strongly suggests that their episodic secretion is dependent on discrete episodes of …

Root Development Of Winter Wheat As Related To Tillage Practice In Western Nebraska, Wallace Wilhelm, L. N. Mielke, C. R. Fenster

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Tillage practices can influence crop root development. Root distributions were determined for wheat (Triticum aestivum L.) grown in a wheat-fallow rotation during the 1977-1978 winter wheat crop year on an Alliance silt loam (Aridic Argiustoll). The fallow tillage treatments were plow, subtillage, and chemical (no tillage). Each tillage treatment was split into subplots for N application of 0 or 45 kg/ha.

Rooting density was determined by washing the roots in soil cores 7.6 cm in diam by 15 cm long extracted to depths of 90, 105, and 120 cm on 28 Mar., 2 May, and 8 June 1978, respectively. …

Seasonal Movements Of White-Tailed Deer In East-Central Illinois, James E. Chelsvig

Masters Theses

No abstract provided.

Woody Vegetation At Burgner Acres, East-Central Illinois: Composition And Changes Since 1964, Larry Philip Lehnen Jr.

Masters Theses

A comparative study was undertaken of the changes in woody vegetation of Burgner Acres during the past 18 years. This ten acre woodlot, located in east-central Illinois was surveyed using a method identical to that of a previous study. A literature review describing the composition of three general types of forests in the Grand Prairie Division of Illinois is included.

Twenty-five arborescent species are present on the study site with white ash (Fraxinus americana L.) maintaining its position as first in importance value (I.V. = relative frequency + relative density + relative dominance). Hackberry (Celtis occidentalis L.) has …

Inhibitors Affecting Bacterial Action In Reaerated Activated Sludge, Alice M. Dunn

Masters Theses

Inhibition of reaerated activated sludge was assessed using reduction of dissolved oxygen uptake by the microbial population as a criterion. Oxygen uptake is essential to biodegradation of the organic components in the activated sludge process; therefore, a decrease in dissolved oxygen uptake is an indication of reduced efficiency in wastewater treatment.

The irihibitors tested were cadmium, copper, lead, mercury, silver, 2,4-Dichlorophenoxyacetic acid (2,4-D), Terbacil and Zectran. The IIC₅₀, determined by extrapolation of plotted data, for each inhibitor in mg/l was Hg (20), Cu (50), Ag (43), Cd (115), Pb (550), and 2,4-D (430). The IIC₅₀ was determined …

Pheasants In Asia 1982: Proceedings Of The Second International Pheasant Symposium (September 1982 : Srinagar, Kashmir), Keith C. R. Howman, Christopher D. W. Savage, M. W. Ridley

Galliformes Specialist Group and Affiliated Societies: Conference Proceedings

Chapter 1: Pheasant Conservation in India and Nepal

Conservation of pheasants in India through biosphere reserves, N. D. Jayal

Pheasant conservation in Nepal, BISWA N. UPRETI

The Machhapuchare Wildlife Conservation Project in Nepal, James Roberts

Planning for the management of a Himalayan pheasant reserve, J. A. Forster

The role of mapping in future management and conservation of pheasants, Christopher D. W. Savage

Chapter 2: Population Studies of Himalayan Pheasants

Surveys, census, monitoring and research: Their role in pheasant conservation, A. J . GASTON

Popluation dynamics of the Koklas pheasant (Pucrasia macolopha) in Malkandi Forests, Pakistan, Wazir Mohammad Khan …

The Ecology Of Mutualism, Douglas H. Boucher, Sam James, Kathleen H. Keeler

School of Biological Sciences: Faculty Publications

Elementary ecology texts tell us that organisms interact in three fundamen­ tal ways, generally given the names competition, predation, and mutualism. The third member has gotten short shrift (264), and even its name is not generally agreed on. Terms that may be considered synonyms, in whole or part, are symbiosis, commensalism, cooperation, protocooperation, mutual aid, facilitation, reciprocal altruism, and entraide. We use the term mutual­ism, defined as "an interaction between species that is beneficial to both," since it has both historical priority (311) and general currency. Symbiosis is "the living together of two organisms in close association," and …

Food Contents Of Six Commercial Fishes From Mississippi Sound, Robin M. Overstreet, Richard W. Heard

Gulf and Caribbean Research

Specific dietary contents from six fishes collected in Mississippi Sound are recorded. In order of their importance, primary components grouped in major taxonomic categories were fishes, penaeid shrimps, and other crustaceans for Cynoscion nebulosus; Crustaceans and fishes for C. arenarius; fishes and crustaceans for C. nothus; crustaceans, pelecypods, and polychaetes for Pogonias cromis; crustaceans, molluscs, polychaetes, and fishes for Archosargus probatocephalus; and fishes and penaeid shrimps for Paralichthys lethostigma. Principal items in the diets of most of the fishes included Anchoa mitchilli, Penaeus aztecus, P. setiferus, and Callinectes sapidus. Those …

The Occurrence Of Lightiella Jones, 1961 (Crustacea: Cephalocarida) In Mobile Bay, Alabama, Richard W. Heard, Gary D. Goeke

Gulf and Caribbean Research

During July 1979, two adult specimens belonging to the cephalocaridan genus Lightiella Jones, 1961 were collected in a box core sample taken at the mouth of Mobile Bay, Alabama. These two specimens were compared to the four described species of Lightiella, and found to be most similar to the northeastern Atlantic species of L. incisa Gooding, 1963 and L. floridana McLaughlin, 1976. Due to a combination of differences in the thoracopodal setation and incisor process of the mandible, the Mobile Bay form cannot at this time be assigned to any of the described species of Lightiella. The two …

Heat Death Of Least Tern Chicks On The Gulfport, Mississippi, Beach In 1980, Gordon Gunter

Gulf and Caribbean Research

The Least Tern is among the smallest of the long-winged flyers and an indescribably ethereal impression emanates from it in flight. Thus great interest was generated when this tern began to nest on the mainland beach of Mississippi Sound about 12 years ago. In 1980, Least Tern chicks died in numbers on the beach and this generated considerable comment and some bombast. An upstate ornithologist announced that poison in the food chain was the cause, but no poison has ever been found in the carcasses of the dead chicks or in the water. The mortality of Least Tern chicks was …

Effects Of Storms On Rice Rats Inhabiting Coastal Marshes, James L. Wolfe

Gulf and Caribbean Research

During 1979, three storms with winds in excess of 73 km/hr and tides up to 1.5 m above normal struck a section of the Mississippi coast where a population study of the rice rat, Oryzomys palustris, was in progress. There were no noticeable effects on population levels, and many individual animals survived the storms.

The Gastropod Thais Haemastoma In Georgia: T. H. Floridana Or T. H. Canaliculata?, Randal L. Walker

Gulf and Caribbean Research

In the southeastern United States, the snail Thais haemastoma has traditionally been subdivided into two subspecies according to the snail‘s locale, size of shell, number and size of spines, and depth of suture. Only Thais haemastoma floridana is supposed to occur in Georgia; since Thais haemastoma canaliculata is supposedly restricted to the Gulf of Mexico region. In Georgia, specimens fitting the description of both subspecies are common. The author concurs with the conclusions of Butler (1953) and Gunter (1979) in that the subspecies nomenclature is invalid and that they are merely ecological variants.

Behavioral Variability In Captive Slow Lorises, Nycticebus Coucang (Lorisidae, Primates), Shan Dustin Duncan

University of the Pacific Theses and Dissertations

This is a quantitative analysis of individual and sex-related variability in selected activities of captive slow lorises (Nyctivebus coucang).

Non-Random Orientation Of Nest Entrances In Saguaro Cacti, R S. Inouye, Nancy J. Huntly, D W. Inouye

Biology Faculty Publications

No abstract provided.

Iodothyronine 5'-Deiodinase: Solubilization, Partial Purification, And Characterization Of A Thyroxine Deiodinase Extracted From Rat Liver Membranes, Samuel C. Powell

Dissertations

No abstract provided.

The Role Of Hypoglycemia In The Development Of Cardiovascular Failure Following Escherichia Coli Endotoxin Administration In The Dog, Philip M. Kober

Dissertations

No abstract provided.

Characteristics And Mechanisms Of Norepinephrine Depletion From The Myocardium And Spleen Of Endotoxic Rats, Benet J. Pardini

Dissertations

No abstract provided.

Chemical And Ultrastructural Characterization Of Trichophyton Mentagrophytes Arthrospore Walls And Septa, Jordan H. Pollack

Master's Theses

No abstract provided.

Home Range, Primary Home Range, Swimming Speeds And Habitat Preference Of The Largemouth Bass, The Bluegill, The Yellow Perch And The Pumpkinseed As Determined Via Radio Telemetry, Pamela A. Fish

Master's Theses

No abstract provided.

Multivariate Analyses Of Mid-Winter Fattening In Two Species Of Passerine Birds, Michael Harold Shelor

Theses and Dissertations

Although the adaptive significance of daily and seasonal fattening of birds has been studied by many investigators (see Odum, 1965; King, 1972; Blem, 1976a), surprisingly little is known about the interactions of proximate and ultimate environmental factors regulating avian lipid levels. An exception is the study by Evans (1969). He found that lipid levels in Yellow Buntings (Emberiza citrinella) were more closely correlated with long-term temperature averages than with temperatures of the day of capture, or the days preceding or following capture. This is an indication that temperature may be more important as an ultimate control of fattening, through natural …

The Influence Of Salinity On Larval Development And Population Dynamics Of Anopheles Merus Dönitz (Diptera: Culicidae), F. W. Mosha, C. M. Mutero

All Peer-Reviewed Publications

Variations in density of adults of Anopheles merus Dön. in Jimbo Village on the Kenya Coast were found to be correlated both with rainfall and with salinity at their breeding sites. Densities started to increase at the beginning of the rains when several breeding sites were formed. This was followed by a decline in numbers resulting mainly from the decrease in salinity in the semi-permanent breeding sites. A second rise occurred after the end of the rains, corresponding with an increase in salinity in the semi-permanent breeding sites due to evaporation. Peak density coincided with salinities of 30–50% sea water …

Myology And Osteology Of Lupinoblennius Herre (Pisces: Blenniidae), William A. Roumillat

Biological Sciences Theses & Dissertations

Certain osteological characters of the genus Lupinoblennius Herre (Pisces: Blenniidae) indicate that it is a specialized member of the tribe Blenniini. Two of these characters are similar to those reported in more advanced tribes. Unifying this genus with the Blenniini are certain muscle patterns that appear unique for the tribe. A comprehensive description of blenny musculature is presented to correct previous literature misinterpretations, and to lay the groundwork for future infrafamilial comparative anatomical studies.

Vegetation Pattern And Disturbance Effects In The Subalpine-Alpine Interface, Valley Of The Ten Peaks, Alberta, Katherine J. Miller

Theses and Dissertations (Comprehensive)

There have been several recent calls in the biogeography and vegetation ecology literature to investigate more thoroughly the role of recurrent disturbance or perturbation in the dynamics of subalpine communities, by assessing persistence and change in the dominant species population. In order to study the relationship between conifer regenerative effectiveness, disturbance effects, and the nature of the vegetation pattern, a field study was made of the vegetative cover (composition, abundance, dominance) and its performance (survival, vigour, and reproductive mode) in the upper subalpine zone in the Valley of the Ten Peaks, Banff National Park, Alberta. The occurrence of stresses and …

A Calcium-Phosphate-Phospholipid Complex Extracted From Rats Exhibiting Calciphylactic Nephrocalcinosis, Elaine Bardes Haynes

Dissertations and Theses @ UNI

Calciphylactic nephrocalcinosis was induced in female Sprague Dawley rats by treatment with dihydrotachysterol (0.5 mg/100g body weight) and thallous acetate (2 mg/100 g body weight). A calcium-phosphatephospholipid complex was isolated from rat kidneys exhibiting calciphylactic nephrocalcinosis and from untreated controls. There was a statistically significant greater quantity of complex extractable after calciphylaxis was induced. An average of 8.0% of the total phospholipid extracted from the tissue was present in complexed form in treated animals and 3.7 % in control animals. The phospholipid component of the complex was identified as phosphatidyl serine. The ratio of calcium to phosphate was less than …

A Comparative Analysis Of Potential Nitrification And Nitrate Mobility In Forest Ecosystems, Peter M. Vitousek, James R. Gosz, Charles C. Grier, Jerry M. Melillo, William A. Reiners

Dartmouth Scholarship

Mobilization in a wide range of forest ecosystems were investigated through a combination of field and laboratory experiments.Trenched plot experiments were performed in 17 forests, and laboratory incubation studies of potential ammonium and nitrate production were made on soils from 14ofthese sites.

The Red-Tailed Hawk On Sauvie Island, Oregon, Kevin J. Lien

Dissertations and Theses

A study was undertaken to determine the abundance, distribution, perching heights, diets and territory sizes of Red-Tailed Hawks on Sauvie Island, Oregon. Sauvie Island supported a large wintering population of non-territorial Red-Tailed Hawks. The establishment of territories began around 10 January. Average perch height was found to be 14.2 m. Average perch height increased from fall to spring, corresponding-to the onset of the breeding season and to the onset of egg-laying and incubation. Voles (Microtus spp.) were the principal prey year-round, though waterfowl were more important in terms of biomass in the winter and early spring. Territory sizes on the …

Temporal And Phenomenological Aspects Of Social Behavior In Captive Wolves (Canis Lupus L.), Paul C. Paquet

Dissertations and Theses

Although cooperative behavior is generally acknowledged to occur among wolves, there is a lack of systematically collected data confirming the extent of development. The objectives of this study were to collect long-term, detailed observations documenting the role of social structure, seasonal influences, and individual participation in wolf pack cooperative activities. Individual cooperative strategies were associated with age, sex, and social positions and critically compared with results of similar studies. Emphasis was placed on quantifying group and dyadic relationships, focusing on reproductive strategies and dominance structure. Additional data were collected on denning behavior, maternal care behavior, scent marking, and spontaneous individual …

Sensory Head Pores And Canals In Goodeid Fishes, John Michael Fitzsimons

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

Geographic Variation In The Scrub Euphonia, Robert W. Dickerman

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

Systematic Review Of The Texas Pocket Gopher, Geomys Personatus (Mammalia: Rodentia), Stephen L. Williams, Hugh H. Genoways

University of Nebraska State Museum: Mammalogy Papers

The Texas pocket gopher (Geomys personarus), which occupies a range in southern Texas and extreme northeastern Tamaulipas, was examined for morphological variation. Univariate and multivariate analyses were used to determine age, secondary sexual, individual, and geographic variation. Significant differences were found among the three age classes and between the sexes for 12 of 13 cranial measurements. Males displayed higher individual variation than females. Distributions of the six previously recognized subspecies (fallax, fuscus, maritimus, megapotamus, personatus, and streckeri) were examined. An additional subspecies is recognized and described. Of the seven subspecies of …