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Articles 5371 - 5400 of 5634

Full-Text Articles in Life Sciences

Metaphase Configurations In Drosophila: A Comparison Of Endemic Hawaiian Species And Non-Endemic Species, Frances E. Clayton Jan 1976

Metaphase Configurations In Drosophila: A Comparison Of Endemic Hawaiian Species And Non-Endemic Species, Frances E. Clayton

Journal of the Arkansas Academy of Science

The metaphase configurations of 400 strains from 63 species of Hawaiian Drosophila were determined from squash preparations of larval brain tissue or spermatogenic cells from adult testes. These karyotypes include configurations from seven species not previously described. Metaphases of 148 Hawaiian species have been recorded, including species of the "picture-wing" group, the "modified mouthpart" group, and the "bristle-foot" group. A comparison between Hawaiian species and non-endemic species was made on the basis of chromosome numbers and configurations. Among the Hawaiian species, 85.8% have retained the primitive haploid configuration of five rods and one dot compared with only 34.8% of species …

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Electrophoretic Patterns Of Serum Proteins In Two Subspecies Of Odocoileus Virginianus, Greg S. Jackman, Phyllis J. Garnett Jan 1976

Electrophoretic Patterns Of Serum Proteins In Two Subspecies Of Odocoileus Virginianus, Greg S. Jackman, Phyllis J. Garnett

Journal of the Arkansas Academy of Science

Cellulose acetate electrophoresis revealed six monomorphic forms of serum protein in natural populations of two subspecies of white-tailed deer, Odocoileus virginianus virginianus from Tennessee and Odocoileus virginianus macroura from Arkansas. The fixed pattern of serum proteins in the two populations indicates a lack of genetic variation in the loci controlling these proteins. However, electrophoresis revealed different hemoglobin phenotypes in the two subspecies. This finding indicates that further study is needed to determine whether or not there are genetic differences in the hemoglobin forms

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Dietary Fat-Carbohydrate Combinations: Their Effects On Lipid Metabolism In Estrogen-Treated Rats, Beverly A. Clevidence Jan 1976

Dietary Fat-Carbohydrate Combinations: Their Effects On Lipid Metabolism In Estrogen-Treated Rats, Beverly A. Clevidence

Journal of the Arkansas Academy of Science

Female rats 4 weeks old were fed diets including beef tallow or safflower oil in combination with sucrose or rice starch. At 8 weeks of age, half the rats were orally administered 2 of estrogen (mestranol) in 5 μl of safflower oil and half were fed the vehicle only. After 10 to 14 days of estrogen treatment, rats were fasted and exsanguinated. Alterations were found in weight gain, liver weights, and levels of various lipids in plasma and liver. Most lipid levels were influenced by an interaction of mestranol with one of the dietary factors. No changes were observed in …

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Checklist Of The Coccinellidae Of Arkansas, E. Phil Rouse, Joan B. Chapin Jan 1976

Checklist Of The Coccinellidae Of Arkansas, E. Phil Rouse, Joan B. Chapin

Journal of the Arkansas Academy of Science

A checklist of 49 species of Coccinellidae in Arkansas is updated by the inclusion of species from the reference collection of the University of Arkansas and the collection in the Louisiana State University. This list extends the range of eight species. Distribution, ecological data if known, and references for their identification are included.

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Preliminary Checklist Of Arkansas Acrasieae, Ron Rosen Jan 1976

Preliminary Checklist Of Arkansas Acrasieae, Ron Rosen

Journal of the Arkansas Academy of Science

No abstract provided.

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Soil Salinity Measurement By The Four-Electrode Probe Technique, K. Sriotai, John T. Gilmour Jan 1976

Soil Salinity Measurement By The Four-Electrode Probe Technique, K. Sriotai, John T. Gilmour

Journal of the Arkansas Academy of Science

The four-electrode probe method was tested on a Crowley silt loam soil in which salt type, salt content, and water content were varied. Theory associated with this technique of assessing soil salinity was verified. Equations were developed which quantified the relationships between soil electrical conductivity obtained by the four-electrode probe technique (EC), saturation extract (EC1), and 1:2 soil to water extract (EC2).

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Ouachita Biological Station, Richard K. Speairs Jr. Jan 1976

Ouachita Biological Station, Richard K. Speairs Jr.

Journal of the Arkansas Academy of Science

No abstract provided.

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Fishes Of The Cane Creek Watershed In Southeast Missouri And Northeast Arkansas, Bruce E. Yeager, John K. Beadles Jan 1976

Fishes Of The Cane Creek Watershed In Southeast Missouri And Northeast Arkansas, Bruce E. Yeager, John K. Beadles

Journal of the Arkansas Academy of Science

A survey of the fishes of Cane Creek in southeast Missouri and northeast Arkansas was made between 25 August 1974 and 16 July 1975. Field collections, literature records, fisherman reports, and museum specimens showed the fishes of Cane Creek to be composed of 90 species distributed among 20 families. Records of Lampetra aepyptera (Abbott), Hiodon alosoides (Rafinesque), Etheostoma histrio Jordan and Gilbert, and Percina uranidea (Jordan and Gilbert) were either the first records of these species in this stream or reaffirmed their presence. The fish collected were common to the Ozark, Ozark lowland, lowland, and wide-ranging faunal groups of Pflieger …

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Cave Fauna Of Arkansas: Selected Invertebrate Taxa, V. Rick Mcdaniel, Kenneth L. Smith Jan 1976

Cave Fauna Of Arkansas: Selected Invertebrate Taxa, V. Rick Mcdaniel, Kenneth L. Smith

Journal of the Arkansas Academy of Science

This report is the first in a series of reports describing the fauna of Arkansas caves. Included are notes accumulated during the past four years on nematomorphs, amphipods, isopods, diplopods, decapods, and a variety of insect taxa. In addition to indicated records of distribution, the ecological status of each species (as a cavernicole) is described as troglobitic, troglophilic, trogloxenic, or accidental. Several of the included species are reported for the first time from Arkansas.

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Model For Estimating The Probability Of Crop Production For Ginkgo Biloba L., Michael I. Johnson Jan 1975

Model For Estimating The Probability Of Crop Production For Ginkgo Biloba L., Michael I. Johnson

Journal of the Arkansas Academy of Science

Mature female Maidenhair trees (Ginkgo biloba L.)have been observed to produce seed dispersal units in some years and none in other years. A temperature and/or photoperiod flowering threshold is suggested. Daily temperatures and daylengths at five Ginkgo sites in continental U.S. for January-April 1964-1974 were evaluated. A computer program was designed to estimate daily photothermal equivalent (PTE = temperature and photoperiod), and the magnitude and duration of the PTE in relation to a series of photothermal constants. Use of the data from production and nonproduction years provided a mathematical model for prediction of dispersal unit production. The model was tested …

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Nonpathogenic Free-Living Amoebae In Arkansas Recreational Waters, Leon W. Bone, David A. Becker Jan 1975

Nonpathogenic Free-Living Amoebae In Arkansas Recreational Waters, Leon W. Bone, David A. Becker

Journal of the Arkansas Academy of Science

Selected recreational waters of Arkansas were sampled for pathogenic free-living limax amoebae. Water quality parameters were determined for correlation with amoebic population densities and species diversity. Cultural criteria and animal inoculation revealed no pathogenic strains. The possibility of introduction and/or induction of pathogenic amoebic strains by environmental factors requires further ecological investigations.

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Preliminary Dove Banding Studies In Clark County, Arkansas, Thurman Booth, Peggy Rae Dorris, William N. Hunter, Benny Mays Jan 1975

Preliminary Dove Banding Studies In Clark County, Arkansas, Thurman Booth, Peggy Rae Dorris, William N. Hunter, Benny Mays

Journal of the Arkansas Academy of Science

In conjunction with the U.S. Department of Interior Fish and Wildlife Service, Henderson State University Biology Department made a preliminary study of mourning doves in Clark County, Arkansas, during June, July and August 1974. Three hundred seventy-one mourning doves were baited, trapped and banded to obtain information concerning age, sex, populations, retraps, deformities, effects on other animals, migrations and other behaviors.

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Preliminary Checklist Of The Fishes Of The Illinois River, Arkansas, Michael R. Geihsler, Edgar D. Short, Paul D. Kittle Jan 1975

Preliminary Checklist Of The Fishes Of The Illinois River, Arkansas, Michael R. Geihsler, Edgar D. Short, Paul D. Kittle

Journal of the Arkansas Academy of Science

A survey of the fishes of the mainstream of the Illinois River in northwestern Arkansas produced 51 species representing 11 families. Four of these species, Ictiobus bubalus, smallmouth buffalo; Moxostoma carinatum, river redhorse; Lepomis gulosus, warmouth; and Percina phoxocephala, slenderhead darter, have not been recorded previously from the Arkansas part of the Illinois. Eleven additional species have been reported previously that were not collected during this survey, for a total of 62 species known in the Illinois River.

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Age And Growth Of Bluegill, Lepomis Macrochirus Rafinesque, From Lake Fort Smith, Arkansas, Jacob J. Hogue, Raj V. Kilambi Jan 1975

Age And Growth Of Bluegill, Lepomis Macrochirus Rafinesque, From Lake Fort Smith, Arkansas, Jacob J. Hogue, Raj V. Kilambi

Journal of the Arkansas Academy of Science

A total of 337 bluegill from Lake Fort Smith were used for this study. Annuli were formed between late February and early June, the younger fish forming annuli earlier than older fish. Total length-scale radius and length-weight relationships were determined. Growth of bluegill was compared with that reported in other studies. Growth curves were analyzed by the Von Bertalanffy growth formula and the parameters were evaluated in terms of physical and biological factors.

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Arkansas Butterflies And Skippers, Leo J. Paulissen Jan 1975

Arkansas Butterflies And Skippers, Leo J. Paulissen

Journal of the Arkansas Academy of Science

Since 1955 the writer has been compiling information on Arkansas butterflies and skippers. A list of species is presented from data obtained from personal collecting, extensive contacts with contemporary collectors, and a concerted literature search. A total of 151 species are listed on a chart which also shows from which of five designated areas in the state each species has been reported.

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Parasites Of Selected Gamed Fishes Of Lake Fort Smith, Arkansas, David A. Becker, Donald G. Cloutman Jan 1975

Parasites Of Selected Gamed Fishes Of Lake Fort Smith, Arkansas, David A. Becker, Donald G. Cloutman

Journal of the Arkansas Academy of Science

Surveys during 1961 and 1970 of the helminth parasites of selected game fishes of Lake Fort Smith, Arkansas, are compared. New host records are established in the State of Arkansas for the monogenetic trematode and crustacean parasites of the channel catfish, warmouth, bluegill, white crappie and black crappie.

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Aquatic Macroinvertebrate Fauna Of An Ozark And A Deltaic Stream, Mary R. Cather, George L. Harp Jan 1975

Aquatic Macroinvertebrate Fauna Of An Ozark And A Deltaic Stream, Mary R. Cather, George L. Harp

Journal of the Arkansas Academy of Science

An Ozark and a deltaic stream in northeastern Arkansas were studied to compare physicochemical and aquatic macroinvertebrate parameters and to determine whether the number and kind of organisms increase downstream. Janes Creek, the Ozark-type stream, is clear, spring-fed and alkaline with a steep gradient and high flow velocity; dissolved oxygen values are not limiting. Big Creek, the deltaic stream, is turbid, low in alkalinity and has a slight gradient and low stream velocity. These streams comprise distinct habitats created by differences in substrate, watershed and land use. A total of 122 taxa were collected in both streams, 62 of which …

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Somatic Pairing In Drosophila Virilis Mitosis, William C. Guest Jan 1975

Somatic Pairing In Drosophila Virilis Mitosis, William C. Guest

Journal of the Arkansas Academy of Science

In neuroblast cells homologous chromosomes tend to pair during prophase of mitosis. Heterochromatic elements of homologous chromosomes are widely separated in very early prophase, at which time the euchromatin is poorly stained. Pairing is intimate for euchromatic portions of chromosomes in early and middle prophase with chiasmata frequently present. Homologous chromosomes most commonly lie side-by-side in late prophase and metaphase. Statistical data are presented to show the frequency of intimate pairing in prophase and side by side pairing in metaphase.

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New Distributional Records Of Fishes From The Lower Ouachita River System In Arkansas, Henry W. Robison Jan 1975

New Distributional Records Of Fishes From The Lower Ouachita River System In Arkansas, Henry W. Robison

Journal of the Arkansas Academy of Science

Fishes collected from the lower Ouachita River system in Arkansas during 1971-1974 are reported. As a result of these collections six species were added to the Ouachita River system ichthyofauna of Arkansas including an undescribed species of Notropis, Hybopsis aestivalis (Girard), Ictiobus bubalus (Rafinesque), Fundulus chrysotus (Gunther), Lepomis symmetricus (Forbes) and Etheostoma fusiforme barratti (Holbrook). New distributional records for Ichthyomyzon gagei (Hubbs and Trautman), Notropis maculatus (Hay), N. lutrensis (Baird and Girard), Erimyzon sucetta (Lacepede), Fundulus notti (Agassiz) and Lepomis marginatus (Holbrook) within the system also are presented.

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Some New Or Otherwise Noteworthy Plants Of The Arkansas Flora, Edwin B. Smith, Barney L. Lipscomb Jan 1975

Some New Or Otherwise Noteworthy Plants Of The Arkansas Flora, Edwin B. Smith, Barney L. Lipscomb

Journal of the Arkansas Academy of Science

During the last several years interesting additions have been made to the holdings of the University of Arkansas Herbarium at Fayetteville. A list of 24 species of vascular plants, new or rare in Arkansas, is presented. Many of these were collected by the second author during research for his Master's degree. Several were collected by Marie P. Locke, Pine Bluff, Arkansas

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Castanea Pumila Var. Ozarkensis (Ashe) Tucker, Comb. Nov, Gary E. Tucker Jan 1975

Castanea Pumila Var. Ozarkensis (Ashe) Tucker, Comb. Nov, Gary E. Tucker

Journal of the Arkansas Academy of Science

Castanea ozarkensis Ashe, the Ozark chinquapin of the vascular plant family Fagaceae, is distributed widely throughout the Interior Highlands of Arkansas and the adjacent states of Missouri and Oklahoma. Examination of material from throughout the range of C. ozarkensis indicates demonstrable morphological intergradation with C. pumila (L.) Miller sensu lato, the chinquapin of wide distribution in much of the eastern United States. It is proposed that C. ozarkensis be reduced to C. pumila var. ozarkensis (Ashe) Tucker, comb. nov.

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Limnetic Zooplankton Dynamics In Beaver Reservoir Including An Inventory Of Copepod Species And An Evaluation Of Vertical Sampling Methods, Eugene H. Schmitz Jan 1974

Limnetic Zooplankton Dynamics In Beaver Reservoir Including An Inventory Of Copepod Species And An Evaluation Of Vertical Sampling Methods, Eugene H. Schmitz

Arkansas Water Resources Center Technical Reports

There can be little doubt that the development of primary food sources (i.e. plankton) is an important factor contributing to fish production. Applegate and Mullan (1968) report that an exceptional sport fish harvest is generally associated with the development of new reservoirs, although the precise reasons for such interrelations are not known. Kramer and Smith (1962) demonstrated the tendency of bass fingerlings to feed on Cladocera in proportion to the latter's abundance, and Hodson (1966) reported the same basic pattern for largemouth and spotted bass fingerlings in Beaver Reservoir. Applegate and Mullan (1969) analyzed the digestive tract contents of larval …

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Effects Of Mosquito Control Chemicals On Aquatic Fauna, J. L. Lancaster Jr., M. V. Meisch Jan 1974

Effects Of Mosquito Control Chemicals On Aquatic Fauna, J. L. Lancaster Jr., M. V. Meisch

Arkansas Water Resources Center Technical Reports

No mosquito abatement districts have ever been organized in Arkansas. Mosquito control efforts have been largely adulticiding operations by either aerial application or ground thermal fogging machines. Practically no chemical applications have been directed at the larval stage in residual water in ditches and depressions from which adult populations arise. Some larviciding with ethyl parathion has been done in ricefields. Although the treatment is very effective in mosquito reduction, voluntary treatment has not been completely successful. Because relatively little insecticide has been used as a larvicide in Arkansas, it was possible to evaluate the effect of recommended larvicides on non-target …

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Limnological, Ichthyological, And Parasitological Investigations On Arkansas Reservoris In Relation To Water Quality, John S. Carter, Carl E. Hoffman, Larry L. Olmsted, Raj V. Kilambi, Donald G. Cloutman, David A. Becker Jan 1974

Limnological, Ichthyological, And Parasitological Investigations On Arkansas Reservoris In Relation To Water Quality, John S. Carter, Carl E. Hoffman, Larry L. Olmsted, Raj V. Kilambi, Donald G. Cloutman, David A. Becker

Arkansas Water Resources Center Technical Reports

Lake Fort Smith, a 525 acre (212 ha) reservoir, was impounded in 1936 as a water supply for the city of Fort Smith. The reservoir is located on Clear Creek (Frog Bayou), a tributary of the Arkansas River, in the Boston Mountains 28 miles (45 km) northeast of the city of Fort Smith in Crawford County, Arkansas. A map and morphometric characteristics of Lake Fort Smith are given in Fig. 1 and Table I (Hoffman, 1951; Nelson, 1952). In 1956 Lake Shepherd Springs, a 750 acre (304 ha) impoundment, was created one mile upstream of Lake Fort Smith (Rorie, 1961). …

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Variation In Ligule Spotting In Coreopsis Basalis, Edwin B. Smith Jan 1974

Variation In Ligule Spotting In Coreopsis Basalis, Edwin B. Smith

Journal of the Arkansas Academy of Science

The ligules of Coreopsis basalis bear an attractive reddish-brown spot at the base. The spot has been used as a taxonomic character of the species. But there is variation within populations at any one time, and within individuals at sequential times, for the size of the spot. A few individuals lack the ligule spot entirely. Variation in average ligule spot size in greenhouse-grown populations of C. basalis and an artificial hybrid is described. Average spot size declines as the blooming season progresses. Some individuals with spotted ligules early in the season bore spotless ligules late in the season. No correlation …

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Ichthyofaunal Diversification And Distribution In Jane's Creek Watershed, Randolph County, Arkansas, Cheryl Lynn Fowler, George L. Harp Jan 1974

Ichthyofaunal Diversification And Distribution In Jane's Creek Watershed, Randolph County, Arkansas, Cheryl Lynn Fowler, George L. Harp

Journal of the Arkansas Academy of Science

The purposes of this study were to determine the qualitative and quantitative distribution of fishes in the Jane's Creek watershed. Jane's Creek is a clear, spring-fed Ozark stream in northeastern Arkansas. A knowledge of the ichthyofauna of this stream prior to a long-range impoundment is of significance to the natural history of Arkansas. Jane's Creek and its tributaries were found to be alkaline, with no measurable turbidity, and to have low levels of carbon dioxide. Dissolved oxygen values ranged from 6.1 to 16.0 ppm. Only slight differences in physicochemical conditions were noted among stations and between pool and riffle areas …

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Multi-Use Of The Campus Environment In The Teaching Of Botany, Jewel E. Moore Jan 1974

Multi-Use Of The Campus Environment In The Teaching Of Botany, Jewel E. Moore

Journal of the Arkansas Academy of Science

Use of the campus environment in the teaching program is described with special reference to the campus of University of Central Arkansas. Permanent labels identify the campus trees, many of which are representative of native Arkansas trees. A Daylily Display Bed and an Iris Display Bed, both composed of hybrid varieties, are included in the campus design. This organization of the flora of the campus provides a community service as well as an outdoor supplement to the classroom studies in plant science.

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Effects Of Mississippi Delta Flooding On Spider Populations, Peggy Rae Dorris Jan 1974

Effects Of Mississippi Delta Flooding On Spider Populations, Peggy Rae Dorris

Journal of the Arkansas Academy of Science

The Mississippi Delta flooded in the spring of 1973. Spider collections made in a Delta area of Mississippi in 1972 are compared with those made in 1973 during the flood and after it subsided. Because many egg cases and immature and mature spiders were destroyed by the flood, the spider population was diminished.

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Threatened Fishes Of Arkansas, Henry W. Robison Jan 1974

Threatened Fishes Of Arkansas, Henry W. Robison

Journal of the Arkansas Academy of Science

Intensive field collecting throughout Arkansas and a survey of literature and museum records revealed 37 fish species and subspecies in Arkansas to be threatened by human activities. Of these 37 threatened forms, seven are considered rare and endangered. One may be extinct. With regard to distribution, 19 threatened forms reside in the White River system and 11 and 10 inhabit the Arkansas and Red River systems, respectively. Nine fishes are considered threatened in the Ouachita River system, four threatened froms are known in the St. Francis drainage, and two are known in the Mississippi River proper.

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Vascular Plant Family Lauraceae In Arkansas, Gary E. Tucker Jan 1974

Vascular Plant Family Lauraceae In Arkansas, Gary E. Tucker

Journal of the Arkansas Academy of Science

The family Lauraceae is represented in Arkansas by a total of four species, members of the genera Lindera. Persea and Sassafras. Keys and distribution maps are provided. Lindera melissaefolium is reported from Arkansas for the first time.

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