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A Floristic Study And Grouse Production In The Mille Lacs Wildlife Area, Michael J. Scanlan
A Floristic Study And Grouse Production In The Mille Lacs Wildlife Area, Michael J. Scanlan
Journal of the Minnesota Academy of Science
The upland vegetation in four stands was analyzed for differences in conditions important for ruffed grouse production. The structure of the control stand suggests that Acer saccharum and other shade-tolerant tree species will replace the dominants Quercus borealis and Populus tremuloides. The Acer saccharum would not be useful to grouse. In an adjacent stand in which forest litter had been burned, there was a tremendous amount of reproduction of trembling aspen and much less sugar maple reproduction, compared with the control stand. Differences in the understory beneficial to grouse also were found.
Influence Of Soil Acidity On The Occurrence Of Athiorhodaceae, Eville Gorham, Douglas C. Pratt
Influence Of Soil Acidity On The Occurrence Of Athiorhodaceae, Eville Gorham, Douglas C. Pratt
Journal of the Minnesota Academy of Science
Enrichment cultures from strongly acid Sphagnum bog peats and moderately acid to circumneutral fen peats revealed Athiorhodaceae to be present in almost all suitably wet samples above pH 5.3 and absent from almost all samples below pH 4.7. These bacteria were recorded in only one of fifty cultures from acid humus layers in a jack pine forest, and in none of thirty cultures from moderately acid humus layers in a mixed woodland. They were also absent from old-field surface soils, which often contained considerable amounts of organic litter.
Mouth Brooding Behavior In The Substrate Spawning Cichlid, Tilapia Sparrmani, Hollie L. Collins
Mouth Brooding Behavior In The Substrate Spawning Cichlid, Tilapia Sparrmani, Hollie L. Collins
Journal of the Minnesota Academy of Science
Tilapia sparrmani has long been considered a substrate spawning fish but a considerable number of oral brooding tactics hove been observed. Two "experiments" where foreign species young were nurtured orally suggest rather strong oral brooding tendencies for this species.
Toward An Energy Policy, Dean E. Abrahamson
Toward An Energy Policy, Dean E. Abrahamson
Journal of the Minnesota Academy of Science
The lack of a national policy on fuels and energy at a time of concern about the future supply and demand for energy and the environmental effects of creating energy is examined. Alternatives to present practices in generating and utilizing power are considered along with suggestions for measuring the "energy cost" of technological progress.
Blood Chemistry Values For Some Fishes Of The Upper Mississippi River, Joseph B. Hunn
Blood Chemistry Values For Some Fishes Of The Upper Mississippi River, Joseph B. Hunn
Journal of the Minnesota Academy of Science
Plasma concentrations of sodium, potassium, calcium, magnesium, chloride, inorganic phosphate, glucose, lactic acid and total carbon dioxide and whole blood pH and hematocrit were determined for nine species of fish from the Upper Mississippi River area. Most of the values obtained fall within the range of values published for other freshwater fishes, except that the plasma concentrations of potassium and chloride in sexually mature walleye pike were low. The chloride was compensated for by a high plasma total carbon dioxide. Further studies should establish whether these blood chemistry values may be considered of normal range. counties.
Scirpus Validus And S. Acutus: A Question Of Distinctness, Marlyn Miller, E. O. Beal
Scirpus Validus And S. Acutus: A Question Of Distinctness, Marlyn Miller, E. O. Beal
Journal of the Minnesota Academy of Science
An analysis of 32 populations of bulrushes in the Scirpus validus-acutus complex growing in Itasca State Park and prairie ponds to the west indicates that most of the populations are referable to neither S. validus nor S. acutus but, rather, are intermediate in morphology. Further, the supposedly characteristic features by which the two nomenclatural species have been identified are erratically correlated.
A Computer Analysis Of Relationships Between Orders Of Chrysophyta, David P. Olds
A Computer Analysis Of Relationships Between Orders Of Chrysophyta, David P. Olds
Journal of the Minnesota Academy of Science
The division Chrysophyta has previously been formulated to include three diverse groups. A computer analysis was made of the individual orders within the division to determine the "naturalness" of this grouping and also to show how computer techniques may be used for this purpose. The computer methods are described, and a possible system of classification of the division based on the computer analysis is presented.
Fishes Of The Yellow Medicine River In Southwestern Minnesota, Carl H. Ernst
Fishes Of The Yellow Medicine River In Southwestern Minnesota, Carl H. Ernst
Journal of the Minnesota Academy of Science
In view of the possible impoundment of the Yellow Medicine River in southwestern Minnesota by a proposed United States Army Corps of Engineers dam, a survey of the fish-fauna of this river was undertaken. The fish-fauna is listed and discussed, as are also the possible effects of the impoundment.
An Experimental Introductory Course For Prospective Secondary Science Teachers, Marjorie A. Boeck
An Experimental Introductory Course For Prospective Secondary Science Teachers, Marjorie A. Boeck
Journal of the Minnesota Academy of Science
Described is a first course in education at the University of Minnesota for prospective science teachers which combines educational psychology, science content and micro-leaching experiences. The methods used and logistical problems related to such a course also are described. Students in the course kept daily logs of their reactions lo curricular materials, teaching techniques, and the micro-teaching experience to provide positive feedback to the instructors. In an examination covering the psychology aspects, all students in the combined course scored above the median for students from other sections. This experimental course has been adopted as the pattern for all science education …
Size-Structure Correlation In Developing Roots Of Cissus And Syngonium, David L. Berquam
Size-Structure Correlation In Developing Roots Of Cissus And Syngonium, David L. Berquam
Journal of the Minnesota Academy of Science
The development of conducting tissues in relation to root size is examined in Cissus sicyoides L. and Syngonium podophyllum Engl. Evidence is presented that such relationships arise earlier in development than has hitherto been described. Their early appearance calls into question the hypothesis that such relationships reflect a solution to problems of water economy in mature tissues. While pattern determination in Syngonium is similar to that anticipated on the basis of published investigations, a new 'kind of size-structure correlation is identified in Cissus. In light of this fact, a need to broaden the philosophical bases for an interpretation of form …
Higher Fungi Of Minnesota, Ll., Margaret G. Weaver, Robert L. Shaffer
Higher Fungi Of Minnesota, Ll., Margaret G. Weaver, Robert L. Shaffer
Journal of the Minnesota Academy of Science
This paper, an annotated list of 240 species of Ascomycetes and Basidiomycetes of Minnesota, is the first published report of the occurrence of many of the species in the state and is the second report presented by the authors. These collections were made in nine Minnesota counties.
Deciduous Trees Of Minnesota: A Winter Key, Thomas Morley
Deciduous Trees Of Minnesota: A Winter Key, Thomas Morley
Journal of the Minnesota Academy of Science
Keys are provided for the identification in winter condition of Minnesota's native deciduous trees and also those commonly cultivated. A labelled plate of illustrations accompanies the keys, as does a brief selected reference list.
Pine Reproduction In Itasca State Park: Analysis In Moisture-Nutrient Coordinates, Vilis Kurmis, Henry L. Hansen
Pine Reproduction In Itasca State Park: Analysis In Moisture-Nutrient Coordinates, Vilis Kurmis, Henry L. Hansen
Journal of the Minnesota Academy of Science
Natural pine reproduction was studied in 36 forest communities representing the range of ecological variability of the upland forest in Itasca Park, Minnesota. The method of synecological coordinates was used to evaluate reproduction in relation to stand and site conditions. In the absence of fire, predominantly medium to nutrient-rich forest soils favor the growth of herbs, shrubs, and hardwoods under the open canopies of pine and aspen stands. There are very few red pine (Pinus resinosa Ait.) and jack pine (Pinus banksiana Lamb.) seedlings under these conditions, and growth of white pine (Pinus strobus L.) seedlings is severely restricted.
Handling And Distribution Considerations In World Grain Food Supply, Richard W. Fulmer
Handling And Distribution Considerations In World Grain Food Supply, Richard W. Fulmer
Journal of the Minnesota Academy of Science
This paper, which was presented at the 64th annual meeting of the American Institute of Chemical Engineers November 29, 1971, examines the magnitude of loss of basic food groins due to inadequate, non-existent, or inefficient storage and distribution systems. The apparent shortage of nutritional commodities in a hungry world is called needless; and the significance of organized marketing in helping to reduce losses is emphasized.
Notice To Contributors Of Articles
Notice To Contributors Of Articles
Journal of the Minnesota Academy of Science
No abstract provided.
A Computer Simulation Model For Prediction Of Voting In The U.N., Dorothy Dodge
A Computer Simulation Model For Prediction Of Voting In The U.N., Dorothy Dodge
Journal of the Minnesota Academy of Science
This paper discusses an attempt to design a computer based simulation model that would be predictive of voting behavior of the 127 members of the United Nations.
Aquatic Stages Of Stratiomys Normula Unilimbata Loew. (Diptera: Stratiomyiidae), Blanchard O. Krogstad
Aquatic Stages Of Stratiomys Normula Unilimbata Loew. (Diptera: Stratiomyiidae), Blanchard O. Krogstad
Journal of the Minnesota Academy of Science
A study of the life cycle and behavior of the Stratiomys normula unilimbata Loew. in a pond in Itasca State Pork, Minnesota, showed that larvae overwinter in the bottom of the shallow pond and emerge in July. Some of the mortality factors are suggested, including the ichneumonid parasite, Ceratophygadeuon sp., reared from the larva and drowning of the pupa following a sudden increase in water level. Drastic reduction of the water level would also result in larval mortality.
Migration And Mortality Of Banded Mourning Doves, Lawrence L. Thomforde
Migration And Mortality Of Banded Mourning Doves, Lawrence L. Thomforde
Journal of the Minnesota Academy of Science
Banding data gathered over a three-year period at Savage, Minnesota, were analyzed to determine migration patterns and mortality rates of 2,218 mourning doves. The age ratio among trapped doves was 1.19 immatures per 1 adult and the sex ratio 3.84 males per 1 female. The weighted mean annual mortality rate for immature doves was 58.5 percent. For adult doves, the weighted annual mortality was 28.2 percent. The total weighted recovery rate was 1.24 immatures to 1 adult. The data show that immatures are 75 percent more vulnerable than adults to being shot; although no difference was found in direct recovery …
Effect Of Overstory Removal On Production Of Shrubs And Sedge In A Northern Minnesota Bog, James M. Brown
Effect Of Overstory Removal On Production Of Shrubs And Sedge In A Northern Minnesota Bog, James M. Brown
Journal of the Minnesota Academy of Science
A vegetation survey of a northern Minnesota bog three years after the removal of portions of the overstory showed a decrease in total coverage but an increase in frequency of ericaceous shrubs. Dry weight sedge production was approximately five-fold greater in clearcut areas than under the original black spruce canopy.
Biology Of Chrysemys Picta Bellii In Southwestern Minnesota, Carl H. Ernst, Evelyn M. Ernst
Biology Of Chrysemys Picta Bellii In Southwestern Minnesota, Carl H. Ernst, Evelyn M. Ernst
Journal of the Minnesota Academy of Science
The turtle, Chrysemys picta belIii, was studied in southwestern Minnesota. The taxonomic characteristics are analyzed. The turtles are diurnal and have an annual activity period extending from mid-May to October. Activity and feeding are controlled by water temperature. The population dynamics are discussed. Growth is rapid early in life but slows after maturity. Growth is compared with that of other subspecies of C. picta. Habitat preferences, predation, parasites, algal relationships and shell abnormalities are discussed.
Use Of Trawls For Sampling Fish, Howard F. Krosch
Use Of Trawls For Sampling Fish, Howard F. Krosch
Journal of the Minnesota Academy of Science
The use of trawls for sampling fish populations is discussed. Techniques and equipment for this trawling operation included a small boot with a 25-foot trawl and a battery-powered winch on a forward-mounted crossboom for setting and retrieving the trawl.
A Finnish Riihi In Minnesota, Matti Kaups
A Finnish Riihi In Minnesota, Matti Kaups
Journal of the Minnesota Academy of Science
A Finnish riihi in Minnesota is described and analyzed from the perspectives of form and function. The riihi or the combination grain drying, threshing, and winnowing barn, is one of the several folk architectural forms that immigrants from rural Finland built and used in settling sections of Minnesota. Since most of the log structures erected by the Finns are in a state of decay or already have vanished, it seems pertinent to preserve examples of the transplanted folk heritage in writing, and hopefully, in material form as well.
Sex Induction In Equisetum Arvense L., Stephen Davis
Sex Induction In Equisetum Arvense L., Stephen Davis
Journal of the Minnesota Academy of Science
Equisetum arvense was studied for sexual development. The effects of crowding and transplantation were observed to influence sexual maturity and growth patterns of the gametophytes. Regeneration experiments demonstrated that sexual development is environmentally induced.
Poriferan Fauna Of A Minnesota Pond, Louise A. Rollins
Poriferan Fauna Of A Minnesota Pond, Louise A. Rollins
Journal of the Minnesota Academy of Science
An examination of sponges in Lund's Pond, within Itasca State Park, Clearwater County, Minnesota, was conducted in the summer of 1970. Five species, representing four genera, were identified. Some physical characteristics and water chemistry of the pond also were examined.