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Articles 286561 - 286590 of 303809

Full-Text Articles in Physical Sciences and Mathematics

Final Report Of The Hillsborough Bay Water Quality Monitoring Program, City Of Tampa Department Of Sanitary Sewers Mar 1981

Final Report Of The Hillsborough Bay Water Quality Monitoring Program, City Of Tampa Department Of Sanitary Sewers

Reports

The report presented here is the final communication of data collected during the first year and a half of plant operation at variance standards. In addition, earlier data collected by the City of Tampa are also presented in this report in order to give background information of conditions existing prior to operation under the variance (Appendix C). The earlier data may also describe long term trends and normal seasonal cycles occurring in the bay.

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Continuous Flow Nutrient Bioassays With Natural Phytoplankton Populations Collected In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers Mar 1981

Continuous Flow Nutrient Bioassays With Natural Phytoplankton Populations Collected In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers

Reports

The enclosure system chosen for these experiments was continuous and similar to one described by Jones, Tett, Wallis, and Wood (1978a sn b). They successfully maintained for 41 days in the laboratory, with reasonable constant diversity, a natural phytoplankton community from a Scottish Sea-loch.

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Determination Of Diffusion Coefficients Of Ions In Gels, Kelly A. Sanderson Mar 1981

Determination Of Diffusion Coefficients Of Ions In Gels, Kelly A. Sanderson

Theses & Honors Papers

No abstract provided.

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Flow-Shop Scheduling Problems., N. R. Achuthan Dr. Mar 1981

Flow-Shop Scheduling Problems., N. R. Achuthan Dr.

Doctoral Theses

Researchers attention was drawn to the study of schodulirg problems through mathemtical modelling, probably for the first time, when Johnson (1954) publishod his famous paper in mval research logistic quarterly. Thercafter, mny authors have contimued to contribute to the growth of the theory of scheduling. A vast colloctim of papers related to this area is rogularly published by journals like mamgement science, operations research, operational research quarterly, naval research logistic quarterly, opsearch etc.. A good grasp of the litermture in this arca can be had from the books by Conway et al. (1967), Baker (1974) and Rinnooy Kan (1976).This thesis …

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Pine Vole Activity Results For 1979-1980 Toxicant Applications, Roger S. Young Mar 1981

Pine Vole Activity Results For 1979-1980 Toxicant Applications, Roger S. Young

Eastern Pine and Meadow Vole Symposia

The toxicants were placed in an apple orchard consisting of 'Rome' and 'Golden Delicious' trees planted in 1954 at a distance of 20 by 20 feet and thinned to 20 by 40 feet in 1972. Pine voles have been for several years the dominant vole infesting the orchard and have caused an 8% tree loss. Vole activity sites were selected at 30 trees per treatment. Bait applications of brodifacoum (Volak) and chlorophacinone (Rozol) were made by hand placement under roofing pads at one activity site per tree. A treatment was included using the "Mouse-ateria", as the bait station for comparison …

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Colonization Of An Abandoned Orchard By Pine Voles (Microtus Pinetorum), Jack A. Cranford, J. Harrison, T. L. Derting Mar 1981

Colonization Of An Abandoned Orchard By Pine Voles (Microtus Pinetorum), Jack A. Cranford, J. Harrison, T. L. Derting

Eastern Pine and Meadow Vole Symposia

Habitat selection by pine voles (Microtus pinetorum) has been attributed to cover density (Goertz, 1971; Paul, 1970) soil condition (Benton, 1955; Fisher and Anthony, 1980), and food resources (Noffsinger, 1976; Paul, 1970). Goertz (1971) reported that pine voles were distributed in diverse habitats, but there was a close correlation with height and diversity of grass. Miller and Getz (1969) found populations in sloping upland woods, Benton (1955) in dry woods, and Paul (1970) in hardwood slopes with a close correlation between distribution and amount of ground cover. Soil type has been examined by Benton (1955) and Fisher and …

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Analysis Of Seasonal Dynamics Of Pine Vole Populations In Two Virginia Orchards, S. B. Lindquist, A. R. Tipton, G. K. Yarrow, J. J. Hasbrouck Mar 1981

Analysis Of Seasonal Dynamics Of Pine Vole Populations In Two Virginia Orchards, S. B. Lindquist, A. R. Tipton, G. K. Yarrow, J. J. Hasbrouck

Eastern Pine and Meadow Vole Symposia

Presently, V. P. I. and S.U. is involved in a three year multi-disciplinary project to study pine and meadow vole ecology, behavior, and control (see additional V.P.I, and S. U. papers in Proc. Fifth East. Pine and Meadow Vole Symposium). In conjunction with this research, a long-term field study has been initiated to collect seasonal data on vole densities, survivorship, and reproduction in two Virginia apple orchards. The use of these data will be fourfold: (1) to gain insight into the dynamics of Virginia vole populations; (2) to act as a reference (or control) for future field experiments involving manipulation …

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The Status Of Endrin - 1981, Harvey S. Gold Mar 1981

The Status Of Endrin - 1981, Harvey S. Gold

Eastern Pine and Meadow Vole Symposia

As reported in 1980, at the Fourth Annual Pine and Meadow Vole Symposium, the use of endrin would be subject to the EPA Administrator's decision as delineated in the EPA Position Document 4. The details of his decision and the resulting prohibitions and restrictions were given at last year's Symposium and are contained in the official publication of the 1980 Symposium in the article by Lawrence S. Ebner and Harvey S. Gold.

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Proceedings Of The Fifth Eastern Pine And Meadow Vole Symposium, Gettysburg, Pa, March 4-5, 1981 Mar 1981

Proceedings Of The Fifth Eastern Pine And Meadow Vole Symposium, Gettysburg, Pa, March 4-5, 1981

Eastern Pine and Meadow Vole Symposia

Entire symposium.

HIGHLIGHTS OF THE FIFTH EASTERN PINE AND MEADOW VOLE SYMPOSIUM

The Fifth Eastern Pine and Meadow Vole Symposium was held at the Sheraton Inn-Gettysburg, Gettysburg, Pennsylvania March 4 and 5, 1981, for the purpose of assessing the current status of research, extension, and industry programs relating to the problem of vole damage to fruit trees. The meeting was intended to create a problem solving atmosphere in which growers; various governmental agencies such as EPA, USDA, USDI; the chemical industry; and university personnel could observe the cur¬rent thrusts of research and extension programs and their potential impact on future …

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Experimental Results Of Chlorophacinone Ground Sprays In North Carolina, William T. Sullivan Jr. Mar 1981

Experimental Results Of Chlorophacinone Ground Sprays In North Carolina, William T. Sullivan Jr.

Eastern Pine and Meadow Vole Symposia

Field experiments with chlorophacinone (CPN) ground sprays seem to be more effective in control of pine voles in North Carolina orchards when the percentage grass cover under tree drip lines is high. Preliminary laboratory results seem to confirm this observation.

Our group has carried out a number of field trials of the efficacy of ground sprays for controlling pine voles in orchards. In reviewing these tests with special reference to inconsistency of results with chlorophacinone (Hayne 1977) an apparent relationship to the amount of grass cover was noted, and laboratory trials were started to test this question.

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An Approach To Determine The Economic Threshold Level For Pine Voles, Stephen B. White, Theodore L. Huller Mar 1981

An Approach To Determine The Economic Threshold Level For Pine Voles, Stephen B. White, Theodore L. Huller

Eastern Pine and Meadow Vole Symposia

The effectiveness of orchard management, as in any agricultural system, is judged on the total quantity and quality of the produce and on the financial return per unit of investment. Decisions affecting orchard management are based ultimately on economic factors.

This economic criterion should, therefore, be applied to all orchard pest management decisions—including control of the pine vole (Pitymys pinetorum). The purpose of this paper is to describe an approach we are taking to identify factors useful in estimating the economic threshold which can form the basis for cost-effective management of the pine vole and the meadow vole …

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Seasonal Variations In Movements And Habitat Use By Pine And Meadow Voles, Ralph E. Pagano, Dale M. Madison Mar 1981

Seasonal Variations In Movements And Habitat Use By Pine And Meadow Voles, Ralph E. Pagano, Dale M. Madison

Eastern Pine and Meadow Vole Symposia

Free-ranging pine voles (Microtus pinetorum) and meadow voles (M. pennsylvanicus) were radio-tracked in a maintained apple orchard environment in August and December 1980. Meadow voles maintained larger home ranges than pine voles in the summer, but had similar-sized ranges in December. The home ranges for both species decreased with the onset of winter. Pine and meadow voles showed a strong tendency to remain within rows and to restrict most of their movement to areas beneath the canopy. Despite some overlap in space use between the species, the movements of both vole species suggested mutual avoidance. Differences …

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Spacing, Movements, And Social Organization Of A Free-Ranging Population Of Pine Voles Microtus Pinetorum, Randall W. Fitzgerald, Dale M. Madison Mar 1981

Spacing, Movements, And Social Organization Of A Free-Ranging Population Of Pine Voles Microtus Pinetorum, Randall W. Fitzgerald, Dale M. Madison

Eastern Pine and Meadow Vole Symposia

Free-ranging pine voles (Microtus pinetorum) were radio-tracked in a maintained orchard environment from August to November 1980. Pine voles existed in discrete non-overlapping family units with an average of 6.5 individuals per family unit. Home ranges of family members overlapped extensively, and all the members of a single family unit utilized one or two communal nest sites within the family's territory. Males ranged slightly farther than females, and females spent more time in the nest than did males. The mating system appeared to be promiscuous with a high degree of social tolerance among pregnant and lactating females and …

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Influence Of Apples On Population Density, Body Weights, And Reproductive Organ Weights In Pine Voles, J. J. Hasbrouck, F. A. Servello, A. R. Tipton, R. L. Kirkpatrick Mar 1981

Influence Of Apples On Population Density, Body Weights, And Reproductive Organ Weights In Pine Voles, J. J. Hasbrouck, F. A. Servello, A. R. Tipton, R. L. Kirkpatrick

Eastern Pine and Meadow Vole Symposia

Previous field studies at Virginia Tech have found differences in reproductive output of pine voles in abandoned and maintained orchards. Cengel et a1. (1978), trapping in northern Virginia, found higher levels of reproduction in a maintained orchard than in an abandoned orchard. The breeding season of voles extended into winter in the maintained orchard but ceased in late fall and winter in the abandoned orchard. Noffsinger (1976), working in orchards near Roanoke, Virginia, found a higher fatality rate in the maintained orchard and a year-round breeding season; however, the percentage of pregnant females declined in winter. Reproduction was lower in …

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Survey Of Pine Vole Activity In Apple Orchards Near Roanoke, Virginia, Greg K. Yarrow Mar 1981

Survey Of Pine Vole Activity In Apple Orchards Near Roanoke, Virginia, Greg K. Yarrow

Eastern Pine and Meadow Vole Symposia

A survey of pine vole activity in apple orchards around the Roanoke, Virginia area was made in conjunction with current trapping efforts involving pine vole research. A total of 60 orchards were examined and subjectively ranked according to pine vole activity. At least 10% of the trees in each orchard were examined for signs of possible activity.

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Social Behavior Of The Pine Vole (Pitymys Pinetorum): I. Activity Patterns Of Mated Pine Voles In Semi-Natural Environments, Philip O. Renzullo, Milo E. Richmond Mar 1981

Social Behavior Of The Pine Vole (Pitymys Pinetorum): I. Activity Patterns Of Mated Pine Voles In Semi-Natural Environments, Philip O. Renzullo, Milo E. Richmond

Eastern Pine and Meadow Vole Symposia

The root damage resulting from pine vole (Pitymys pinetorum) infestation of apple orchards remains a major vertebrate pest problem. Currently, research effort is being directed at habitat management and at toxic bait development and application as two potentially cost-effective methods for control of these rodents. Recently, investigations have begun into the detailed relationships between the pine vole's physiology and it's habitat in an effort to understand and perhaps disrupt the seemingly ideal balance achieved by the animal in apple orchard situations. In addition to these approaches, which have possible immediate application, one area of pine vole biology that …

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Social Organizations And Reproduction In Freely Reproducing Colonies Of Pine Voles In The Laboratory, Margaret H. Schadler Mar 1981

Social Organizations And Reproduction In Freely Reproducing Colonies Of Pine Voles In The Laboratory, Margaret H. Schadler

Eastern Pine and Meadow Vole Symposia

Freely reproducing colonies of pine voles reared in confined laboratory enclosures have a definite social organization and a predictable pattern of reproduction which results in limitation of population size. Colonies that were established in the laboratory with a single breeding pair showed that: 1) populations were self-limiting, 2) rank order existed with the founding female occupying a dominant position in the hierarchy, 3) reproduction was generally confined to the founding female and 4) the non-reproducing members of the colony showed that they did become reproductive when they were paired with normal mates. This paper is a preliminary report of the …

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A System For The Observation Of Voles Under Semi-Natural Conditions With Applications To: Social Interactions, Competition, Food Habits, Habitat Preference And Bait Accpetance., D. S. Wilkie, M. A. Novak Mar 1981

A System For The Observation Of Voles Under Semi-Natural Conditions With Applications To: Social Interactions, Competition, Food Habits, Habitat Preference And Bait Accpetance., D. S. Wilkie, M. A. Novak

Eastern Pine and Meadow Vole Symposia

A laboratory system to study microtine rodents has been developed that avoids many of the intrinsic restrictions of earlier laboratory and field studies. The system is composed of two interconnected plexiglas tables with a soil substrate and hay cover. The system permits unconstrained visual observation of voles as they move within a runway network of their own construction. The flexibility of the system facilitates its use in various avenues of microtine research.

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Growth And Development Rates Of Microtus Pinetorum Under Different Photoperiods, T. L. Derting, J. A. Cransford Mar 1981

Growth And Development Rates Of Microtus Pinetorum Under Different Photoperiods, T. L. Derting, J. A. Cransford

Eastern Pine and Meadow Vole Symposia

Photo-period and nutrition are important variables affecting reproductive activity and growth in many rodents. Field and laboratory studies indicate that long photo-period (spring-summer) cause Increased growth while short photo-periods (fall-winter) inhibit these processes. In the montane vole (Microtus montanus) recently weaned animals gain weight at a much lower rate under short photo-periods or in total darkness than under long photo-periods (Vaughan et al., 1973; Peterborg, 1978). Adult M. montanus had more offspring and larger mean litter sizes under LD 18:6 than LD 6:18 (Pinter & Negus, 1965). Similarly, long (LD 16:8) or increasing photo-periods stimulated the onset of …

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Frontmatter Mar 1981

Frontmatter

Eastern Pine and Meadow Vole Symposia

Frontmatter

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Registration List Mar 1981

Registration List

Eastern Pine and Meadow Vole Symposia

Registration List

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Non-Target Species Hazard Or Brodifacoum Use In Orchards For Meadow Vole Control, Mark H. Merson, Ross E. Byers Mar 1981

Non-Target Species Hazard Or Brodifacoum Use In Orchards For Meadow Vole Control, Mark H. Merson, Ross E. Byers

Eastern Pine and Meadow Vole Symposia

This year we entered into our second year of non-target species hazard assessment of Brodifacoum used (BFC; ICI Americas, Inc.) as an orchard rodenticide. The primary emphasis of this work has been to in¬vestigate the effects of BFC on birds of prey through secondary poisoning. The hazard level of BFC to raptors should be dependent on the levels found in post-treatment collections of meadow voles (Microtus pennsylvanicus). Post-treatment collections of meadow voles were made during both the 1979 and 1980 field trials. The residue analysis from the 1979 collections are now available (through the courtesy of ICI Americas, …

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Comparison Of Sampling Designs For Vole Population Studies, Donna Bruns Stockrahm, Jay Mcaninch, John D. Harder Mar 1981

Comparison Of Sampling Designs For Vole Population Studies, Donna Bruns Stockrahm, Jay Mcaninch, John D. Harder

Eastern Pine and Meadow Vole Symposia

In the summer of 1980 we initiated a large-scale vole population study in the lower Hudson Valley of New York and had questions regarding trapping designs and sampling procedures. Would samples reflect populations as they occurred in the orchard or would results merely be artifacts of the trapping design?

Renzulli et a1. (1980) examined how time interval between trapping periods, trap spacing, and grid size affected demographic estimates in meadow voles, Microtus pennsylvanicus, in non-orchard habitats. In other small mammal studies conducted in non-orchard habitats, 2 traps per station are often utilized to avoid the exclusion of animals or …

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Radiotelemetric Evaluation Of The Effect Of Horticultural Practices On Pine And Meadow Voles In Apple Orchards: I. Rotary Mowing, Dale Madison, Randall Fitzgerald, Ralph Pagano, Jeffrey Hill Mar 1981

Radiotelemetric Evaluation Of The Effect Of Horticultural Practices On Pine And Meadow Voles In Apple Orchards: I. Rotary Mowing, Dale Madison, Randall Fitzgerald, Ralph Pagano, Jeffrey Hill

Eastern Pine and Meadow Vole Symposia

Pine voles (Microtus pinetorum) and meadow voles (Microtus pennsylvanicus) were studied in three apple orchard plots in the Hudson Valley of New York during June and July 1980. Selected voles from each plot were given miniature radiotransmitters and then tracked before, during, and after rotary mowing.

A total of 11 pine voles and 6 meadow voles were tracked. Home range size was much larger for meadow voles than pine voles. During mowing, meadow voles were noticeably affected by the mower; pine voles were not. No change occurred in the area utilized before and after mowing for …

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Digestibility And Nutritional Quality Of Apple Tree Roots And Other Orchard Forages Of The Pine Vole, F. A. Servello, R. L. Kirkpatrick, K. E. Webb Jr. Mar 1981

Digestibility And Nutritional Quality Of Apple Tree Roots And Other Orchard Forages Of The Pine Vole, F. A. Servello, R. L. Kirkpatrick, K. E. Webb Jr.

Eastern Pine and Meadow Vole Symposia

Analysis of the seasonal food habits of pine voles (Microtus pinetorum) by Cengel et a1. (1978) revealed that apple tree root consumption occurs only during winter months. Increased root consumption in the winter has been postulated to be due to a decrease in the quantity and quality of other foods in orchards. However, the normal translocation of carbohydrates into the root systems of trees during the dormant season may improve the quality of apple tree roots as a food source for voles. One objective of the pine vole nutrition studies at Virginia Polytechnic Institute and State University is …

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Effects Of Tastants On Caching, Gnawing, Grooming And Taste Aversions In Pine Voles (Microtus Pinetorum) And Meadow Voles (M. Pennsylvanicus), Lynette A. Geyer, Christine Kornet Mar 1981

Effects Of Tastants On Caching, Gnawing, Grooming And Taste Aversions In Pine Voles (Microtus Pinetorum) And Meadow Voles (M. Pennsylvanicus), Lynette A. Geyer, Christine Kornet

Eastern Pine and Meadow Vole Symposia

Several behaviors of pine and meadow voles were studied, specifically those affecting the role of taste in ingestion. These behaviors include: 1) caching, 2) gnawing, 3) grooming, and 4) taste aversions.

Male pine voles cached more than females, particularly when housed with females. Solitary females more than those housed in mixed sex pairs. When presented with peanuts and pine dowels in one-hour tests, pine voles cached peanuts first; the addition of flavorants did not affect the sequence in which they were cached. In six-hour tests, however, sucrose— and oil-soaked items were cached first.

Gnawing by pine voles, like caching, was …

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Social Context Affects Expression Of Conditioned Taste Aversions During Grooming By Pine Voles: Implications For Animal Damage Control, J. Russell Mason, Lynette A. Geyer, Christine A. Kornet Mar 1981

Social Context Affects Expression Of Conditioned Taste Aversions During Grooming By Pine Voles: Implications For Animal Damage Control, J. Russell Mason, Lynette A. Geyer, Christine A. Kornet

Eastern Pine and Meadow Vole Symposia

Rodents typically show conditioned aversions to substances previously associated with illness. Aversions can be observed when the tastant is presented in food, water and, for rats, when the tastant is smeared unilaterally on the animal's flank and ingested during auto-grooming. Such results have important implications for rodent control. For that reason, others have investigated whether voles and mice continue to groom when tastants associated with sickness are smeared on their fur. Investigations have shown that grooming persists in the presence of the conditioned stimuli even though strong aversions are shown toward the same tastants in a drinking context. The question …

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Water Metabolism In The Pine Vole, Pitymys Pinetorum, Donald H. Rhodes, Milo E. Richmond Mar 1981

Water Metabolism In The Pine Vole, Pitymys Pinetorum, Donald H. Rhodes, Milo E. Richmond

Eastern Pine and Meadow Vole Symposia

Orchard substrates, in general, provide excellent conditions for pine vole (Pitymys pinetorum) growth and reproduction as indicated by the distribution and abundance of pine voles within orchard situations in the eastern United States (Gourley and Richmond, 1972). However, the specific characteristics which are attractive to pine voles and facilitate their proliferation are poorly understood. The basis for selection of any particular habitat component by the pine vole is in large part a function of the vole's physiological requirements, because the physiological needs of the animals must be met by appropriate habitat resources. Thus, information on specific habitat parameters …

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Volume 5, Number 3 (March 1981), The Solar Ocean Energy Liaison Mar 1981

Volume 5, Number 3 (March 1981), The Solar Ocean Energy Liaison

The OTEC Liaison

No abstract provided.

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Meadow And Pine Vole Control I N 1980 Field Plots, Ross E. Byers, Mark H. Merson Mar 1981

Meadow And Pine Vole Control I N 1980 Field Plots, Ross E. Byers, Mark H. Merson

Eastern Pine and Meadow Vole Symposia

Broadcast treatments of Volak (Brodifacoum), Rozol (Chlorophacinone), ZP Rodent Bait AG, and Ramik-Brown (Diphacinone) gave excellent to good control of voles in decreasing order of effectiveness. A saccharin formulation of Ramik-Brown or doubling the concentration of diphacinone to 0.01% did not result in any additional control over the current formulation. Hand placement of ZP Rodent Bait AG at 1 to 3 lbs/A gave excellent control of voles. Place packs of ZP Rodent Bait AG were not opened at all sites, however, residual activity from apple activity data indicated that this product gave excellent control. Additional field and laboratory evaluations were …

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