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Articles 691 - 720 of 721

Full-Text Articles in Life Sciences

The Biology And Ecology Of The Bromegrass Seed Midge In Nebraska, E. L. Nieman, G. R. Manglitz Nov 1972

The Biology And Ecology Of The Bromegrass Seed Midge In Nebraska, E. L. Nieman, G. R. Manglitz

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

These studies indicate that smooth bromegrass, Bromus inermis Leyss, is the only host of the bromegrass seed midge, Stenodiplosis bromicola Marikovskiy and Agafonova, in Nebraska. The midge did not infest two common annual brome species under field conditions. The midge has been collected from all counties surveyed in Nebraska and seems to be widely distributed throughout the midwestern states. An apparently undescribed species of Tetrastichus (Hymenoptera: Eulophiclae) was observed to parasitize all stages of the bromegrass seed midge. Parasitism rates greater than 90% were observed. The parasite larvae do not kill the midge until damage to the bromegrass floret has ...


Coastal Wetlands Of Virginia: Interim Report No. 2, Kenneth L. Marcellus Jul 1972

Coastal Wetlands Of Virginia: Interim Report No. 2, Kenneth L. Marcellus

Reports

No abstract provided.


Population Ecology Of Uinta Ground Squirrels, Norman A. Slade May 1972

Population Ecology Of Uinta Ground Squirrels, Norman A. Slade

All Graduate Theses and Dissertations

The behavior and ecology of Uinta ground squirrels (Spermophilus armatus) at the Utah State University Forestry Field Station northeast of Logan, Utah were studied from 1964-1971 to determine the role of behavior in population regulation. From 1965 to 1968, data were collected to establish population norms. In 1968, the population density was reduced experimentally to help elucidate regulatory processes. This paper compares the dynamics of the population before and after the population reduction.

Before the density reduction, juvenile survival was lower than that of yearlings and adults. The disappearance of juveniles was associated with their tendency to disperse from the ...


Blue Grouse Ecology And Habitat Requirements In North Central Utah, David A. Weber May 1972

Blue Grouse Ecology And Habitat Requirements In North Central Utah, David A. Weber

All Graduate Theses and Dissertations

The ecology and habitat requirements of a population of blue grouse were studied during 1970 and 1971 on the Cache National Forest 25 miles south of Logan, Utah.

Baseline data concerning numbers of blue grouse, vegetative composition, and insect abundance on the study area were gathered. These data were to be compared to similar measurements made following a herbicidal spraying of the area during 1972.

Information concerning the breeding, nesting, brood rearing, and wintering habits of the grouse was also collected. Male blue grouse migrated to the study area in early April to set up territories. These were located on ...


Ecology Of Aroga Websteri Clarke In Curlew Valley, Utah-Idaho, Reed L. Kirkland May 1972

Ecology Of Aroga Websteri Clarke In Curlew Valley, Utah-Idaho, Reed L. Kirkland

All Graduate Theses and Dissertations

The ecology, life history, and population dynamics of the sagebrush defoliator, Aroga websteri Clarke, were studied in the field and laboratory. The defoliator has one generation a year at the Curlew Valley site. It overwintered in the egg stage and passed through five larval instars. Ten parasite species attacked the defoliator at the study site . Four species, Orgilus ferus, Phaeogenes sp., Spilochalcis leptis, and Apanteles cacoeciae, contributed over 75 percent of the total incidence of parasitism. Parasitism ranged from 20 to 76 percent in 1971, but only ranged from 6 to 29 percent in 1972. This decrease in total parasitism ...


Coyotes And Sheep, Frederic H. Wagner Jan 1972

Coyotes And Sheep, Frederic H. Wagner

USU Faculty Honor Lectures

To many persons not in the profession, the term wildlife management largely connotes the husbandry of fish, birds, or mammals for hunting and fishing purposes. Even if we grant an implied breadth in his use of the term "recreation," Leopold's (1933:3) definition of game management in his classic book by the same name tends to foster this impression: " ... the art of making land produce sustained annual crops of wild game for recreational


The Ecology Of The Zooplankton Community Of A Small Quarry Pond With Special Reference To The Rotifers, Leo J. Curro Jan 1972

The Ecology Of The Zooplankton Community Of A Small Quarry Pond With Special Reference To The Rotifers, Leo J. Curro

Biology Master’s Theses

This study examines the effect of ecological factors within a small limestone quarry pond environment on the relevant biota. The author collected plankton samples over a period of six months in order to track the vertical distribution patterns within various species of zooplankton, while gathering quantitative data on seasonal physical/chemical changes of the pond. Specimens were collected using a net towed for a distance of 18-27m at depths of 0m, 0.5m, and 1.5 m. On completion, the net was removed from the water and organisms were concentrated into a 30ml vial. The sample was then poured into ...


Degradation Of Riparian Leaves And The Recycling Of Nutrients In A Stream Ecosystem, Louis A. Krumholz, Roger G. Lambert, Charles R. Liston, Harry H. Woodward Jan 1972

Degradation Of Riparian Leaves And The Recycling Of Nutrients In A Stream Ecosystem, Louis A. Krumholz, Roger G. Lambert, Charles R. Liston, Harry H. Woodward

KWRRI Research Reports

Leaves collected at 4 stations in the upper 5 km of Doe Run, Meade County, Kentucky, indicated an annual accumulation within the stream of 354 g/m2/year (17,700 kg). Leaves of sycamore (23.6%), red oak (21.7%), sugar maple (9.7%), beech (9.6%), white oak (7.1%), and hickory (6.0%) trees were most abundant, and leaves from 14 other kinds made up the remaining 22.3%. About a third of the annual leaf fall occurred during the last half of October and about two-thirds in the last 3 months of the year.

Calorific equivalents ...


A Preliminary Ecological Study Of Areas To Be Impounded In The Salt River Basin Of Kentucky, Louis A. Krumholz, Stuart E. Neff, Edmond J. Bacon, Jerry S. Parsons, John D. Woodling Oct 1971

A Preliminary Ecological Study Of Areas To Be Impounded In The Salt River Basin Of Kentucky, Louis A. Krumholz, Stuart E. Neff, Edmond J. Bacon, Jerry S. Parsons, John D. Woodling

KWRRI Research Reports

This report includes work that is an extension of Project No. B-005-KY as reported in Research Report No. 43 of the University of Kentucky Water Resources Institute. That project was initiated in April 1968 as Project No. A-019-KY with principal emphasis on physical, chemical, and biological characteristics of the main stem of the Salt River upstream from the proposed damsite for Taylorsville Lake, an impoundment of about 3, 600 acres at seasonal pool. The report includes descriptions of an additional 13 stations along the stream, bringing to 38 the number of permanent collecting sites.

Values for dissolved oxygen ranged from ...


A Preliminary Ecological Study Of Areas To Be Impounded In The Salt River Basin Of Kentucky, Louis A. Krumholz Sep 1971

A Preliminary Ecological Study Of Areas To Be Impounded In The Salt River Basin Of Kentucky, Louis A. Krumholz

KWRRI Research Reports

This report covers work that is an extension of Project No. A-019-KY. A series of 25 sampling stations was established in the mainstream and tributaries of the Salt River that extend from the source of the stream in Boyle County to a few miles below the site of Taylorsville Darn in Spencer County. Sampling for water chemistry and biota was carried out semimonthly. Data on temperature, oxygen, depth, and discharge, along with analyses for cations (Ca, Mg, Fe, Mn) and anions (PO4, NO3, NO2, CO3, HCO3) have been accumulated and analyzed. Bottom fauna, fishes, and ...


Ecology Of Badgers In Curlew Valley, Utah And Idaho With Emphasis On Movement And Activity Patterns, Frederick G. Lindzey May 1971

Ecology Of Badgers In Curlew Valley, Utah And Idaho With Emphasis On Movement And Activity Patterns, Frederick G. Lindzey

All Graduate Theses and Dissertations

Between March, 1969 and July, 1970, 16 badgers (Taxidea taxus) were caught and fitted with radio transmitters in the southern part of Curlew Valley. The animals were followed telemetrically; seven animals contributed sufficient data from which home-range, movement and activity patterns could be discerned. The aver age annual home-range size of five females was 664 acres (± s.d. 99 .5 acres). Female home-range sizes were approximately the same within crested wheat-grass (Agropyron aristatum) and sagebrush (Artemisia tridentata) vegetation types, with greater distances traveled each night by females in the crested wheat-grass. Both home-range size and total movement were less during ...


Distribution And Structure Of Benthic Communities In The Hampton Roads Area, Virginia: A Technical Ecological Report To The Hampton Roads Sanitation District Commission, Donald F. Boesch Apr 1971

Distribution And Structure Of Benthic Communities In The Hampton Roads Area, Virginia: A Technical Ecological Report To The Hampton Roads Sanitation District Commission, Donald F. Boesch

Reports

No abstract provided.


Coastal Wetlands Of Virginia: Interim Report Of The Governor And General Assembly, Marvin L. Wass, Thomas D. Wright Dec 1969

Coastal Wetlands Of Virginia: Interim Report Of The Governor And General Assembly, Marvin L. Wass, Thomas D. Wright

Reports

No abstract provided.


Western Ironweed: Research On Anatomy, Physiology, Life History And Control, M. K. Mccarty, C. J. Scifres Apr 1969

Western Ironweed: Research On Anatomy, Physiology, Life History And Control, M. K. Mccarty, C. J. Scifres

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

Western ironweed (Vernonia baldwini Torr.) is a member of a widespread and diverse genus. The genus is characterized by perennial herbs and shrubs. Weaver and Darland listed the increase of western ironweed, at one time sparsely distributed, as an indication of degeneration of the true prairie. They described the invasion, spread, and ultimate dominance of western ironweed in many pastures after the drought years. Weaver measured ironweed roots to a depth of 11 or 12 ft., and remarked that it was one of "the most abundant and worst weeds in native pastures derived from the true prairie." Research has been ...


Aspen Grove Use By Deer, Elk, And Cattle In Southwestern Coniferous Forests, Hudson G. Reynolds Jan 1969

Aspen Grove Use By Deer, Elk, And Cattle In Southwestern Coniferous Forests, Hudson G. Reynolds

Aspen Bibliography

No abstract provided.


Ecological Study Of The Effects Of Strip Mining On The Microbiology Of Streams, Ralph H. Weaver, Harry D. Nash Jan 1968

Ecological Study Of The Effects Of Strip Mining On The Microbiology Of Streams, Ralph H. Weaver, Harry D. Nash

KWRRI Research Reports

The microflora of Cane Branch of Beaver Creek in McCreary County, Kentucky, which drains an area that was strip-mined between 1955 and 1959, was studied and compared with that of Helton Branch which drains a comparable area where there has been no mining. Differences include: the establishment of Ferrcbacillus ferrooxidans, for which procedures were developed for direct colony isolation from the stream; fewer saprophytic bacteria; more numerous and more diversified filamentous and unicellular fungi; and characteristic differences in algal flora. Representatives of 42 genera of filamentous fungi were identified. Of these, 21 were isolated only from Cane Branch. Representatives of ...


Chronology Of Reproduction Of The Fox Squirrel In Iowa, Richard John Mccloskey Jan 1968

Chronology Of Reproduction Of The Fox Squirrel In Iowa, Richard John Mccloskey

Retrospective Theses and Dissertations

No abstract provided.


Ecological Studies Of Native Greenriver Fishes Below Flaming Gorge Dam, 1964-1966, Charles David Vanicek May 1967

Ecological Studies Of Native Greenriver Fishes Below Flaming Gorge Dam, 1964-1966, Charles David Vanicek

All Graduate Theses and Dissertations

Investigations to study (1) the species composition and distribution of Green River fishes between Flaming Gorge Dam and Ouray, Utah and (2) the ecology and life history of selected native species (Colorado squafish, Ptychocheilus lucius; Colorad chub, Gila robusta; bluehead sucker, Pantosteus delphinus; and humpback sucker, Xyrauchen texanus) in Dinosaur National Monument were conducted from May, 1964, to October, 1966. A total of 23,735 fish consisting of 9 indigenous and 11 exotic species, were taken in 639 collections by electrofishing gear, gill nets, seines, and fry gear. Flaming Gorge Dam has caused a major change in the ecology of ...


Influence Of Fire On Aspen Suckering, K.W. Horton, E.J. Hopkins Jan 1964

Influence Of Fire On Aspen Suckering, K.W. Horton, E.J. Hopkins

Aspen Bibliography

No abstract provided.


Ecology Of Spring Fed Salt-Marshes, Eric George Bolen May 1962

Ecology Of Spring Fed Salt-Marshes, Eric George Bolen

All Graduate Theses and Dissertations

Any marsh is a distinctive land-forrm of varied interest. To the agriculturist it is wasteland to be reclaimed; to the naturalist, a habitat of aesthetic value. To the ecologist, however, a marsh represents a complexity of vegetation under the influences of many and often inseparable factors. It becomes a place of challenging study.

There exists a notable lack of information treating the ecology of inland salt-marshes. Still less known are the ecological conditions imposed upon plant life in marshes arising from saline springs. The presence of such a wetland in western Utah afforded the opportunity to study salt-marsh vegetation in ...


Ecology Of The Aspen Parkland Of Western Canada In Relation To Land Use, R.D. Bird Jan 1961

Ecology Of The Aspen Parkland Of Western Canada In Relation To Land Use, R.D. Bird

Aspen Bibliography

No abstract provided.


Silvical Characteristics Of Bigtooth Aspen [Populas Grandidentata], P.E. Slabaugh Jan 1958

Silvical Characteristics Of Bigtooth Aspen [Populas Grandidentata], P.E. Slabaugh

Aspen Bibliography

No abstract provided.


Ecology Of Plant Distribution On The Salt-Deserts Of Utah, Dillard H. Gates May 1956

Ecology Of Plant Distribution On The Salt-Deserts Of Utah, Dillard H. Gates

All Graduate Theses and Dissertations

The reciprocal effects of vegetation and soils have long been a subject of speculation and conjecture. In the management of any natural land area the problem of interpreting vegetational expression is especially important. The effects of native vegetation on soils and the effects of the soil on the vegetation have been studied and observed for many years. The arid-desert range lands have been studied and observed for many years. The arid-desert range lands have been studied least and as a result are not well understood.

As human populations increase there will be additional need for agricultural production, and these lands ...


Prevernal Leafing Of Aspen In Utah Mountains, W.P. Cottam Jan 1954

Prevernal Leafing Of Aspen In Utah Mountains, W.P. Cottam

Aspen Bibliography

No abstract provided.


Studies In The Life History And Ecology Of The American Pintail (Anas Acuta Tzitzihoa Vieliot) In Utah, Robert W. Fuller May 1953

Studies In The Life History And Ecology Of The American Pintail (Anas Acuta Tzitzihoa Vieliot) In Utah, Robert W. Fuller

All Graduate Theses and Dissertations

Wildlife management has been defined as lithe manipulation of wild populations of vertebrate animals in their relation to man and his interests" Wildlife management, then, could not exist in the absence ot either wildlife or humans. Converting this idea to the waterfowl situation, we can say that there are no waterfowl problems other than as they exist in the minds of men. (Wil1s, 1951) These words by the Chief of the IllinoIs Natural History Survey precede a plea for fundamental facts and a basic understanding of waterfowl upon which sound management can in turn be based. l"or only through ...


Prairie Flora On The Missouri River Bluffs Of Western Iowa , John Barstow Morrill Jr. Jan 1953

Prairie Flora On The Missouri River Bluffs Of Western Iowa , John Barstow Morrill Jr.

Retrospective Theses and Dissertations

In western Iowa, from Sioux City south to Hamburg, the Missouri River flood plain is bordered by a series of abrupt loess bluffs. Because of the wide variability in exposure, because of the characteristic wind-deposited loess and because of the accessability to river migration routes, the bluffs possess a diverse, albeit characteristic flora. Investigations of localized or specialized ecological niches frequently yield not only floristic data but insight into historical development and migration movements of both individual species and floristic units. For instance, McLaughlin (1932) in his study of the sand barren flora of northwest Wisconsin was able to show ...


Mammals Of Utah County, James W. Bee May 1947

Mammals Of Utah County, James W. Bee

Student Publications

Based on the premises that an accurate determination and description of the mammals of Utah County is a prerequisite for subsequent research in ecology, geographic distribution and evolutionary taxonomy, this thesis is submitted. While it is essentially taxonomic, there are included related subjects to permit a more thorough interpretation of the subject as a whole.

Summarizing, the objectives are:

  • a. To list and key the known mammals of Utah County with descriptions and measurements.
  • b. To ascertain their geographic range within the county.
  • c. To present significant ecological and geological data for the proper appreciation of the problems of evolutionary ...


Range Land Of America And Some Research On Its Management, Laurence A. Stoddart Apr 1945

Range Land Of America And Some Research On Its Management, Laurence A. Stoddart

USU Faculty Honor Lectures

Although grazing of livestock has been a practice and a profession of man almost from his beginning only recently has range management reached anything approaching a pre~ cise science. Although ' trials and errors over the years brought to light much practical methodology for assuring high production from grazing land, still it remained for the plant physiologist and ecologist to find the whys and wherefores, and to advance new methods and new thoughts which promise to increase productivity still further and at the same time maintain the great range resource.

The peculiar land situation that marked America in her forma~ tive ...


An Analysis Of Seed Production Of Native Kansas Grasses During The Drought Of 1939, Lester R. Branson Jul 1940

An Analysis Of Seed Production Of Native Kansas Grasses During The Drought Of 1939, Lester R. Branson

Master's Theses

The present interest in the control of soil erosion and the stabilization of agriculture has initiated a great amount of research to find suitable grasses and methods for restoring grass production. The results of these investigations have shown that the native climax grasses are best suited for reseeding in arid and semi-arid regions


A Taxonomic And Ecological Study Of Acridinae Of Utah (Orthoptera-Locustidae), Herald C. Bennion May 1939

A Taxonomic And Ecological Study Of Acridinae Of Utah (Orthoptera-Locustidae), Herald C. Bennion

All Graduate Theses and Dissertations

Orthoptera, especially the family Locustidae, is one of the most important and most interesting orders of insects in the state of Utah. It includes a polyphagus group of great economic importance in the state. The topography and climate of Utah varies from forested alpine slopes to hot arid desert wastes, several life zones being represented. This great variation from desert to alpine in Utah presents a rather unique region for taxonomic and ecological studies of the Orthoptera. The most familiar representatives of the insect order Orthoptera are the long-horned grasshoppers, locusts, crickets, katydids, and cockroaches. Orthoptera are characterized by Comstock ...