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University of Arkansas, Fayetteville

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Visualization Of An Approach To Data Clustering, Marisabel Guevara May 2008

Visualization Of An Approach To Data Clustering, Marisabel Guevara

Computer Science and Computer Engineering Undergraduate Honors Theses

Using visualization and clustering goals as guidelines, this thesis explores a graphic implementation of a data clustering technique that repositions vertices by applying physical laws of charges and springs to the components of the graph. The resulting visualizations are evidence of the success of the approach as well as of the data sets that lend themselves to a clustering routine. Due to the visual product of the implementation, the algorithm is most useful as an aid in understanding the grouping pattern of a data set. Either for a rapid analysis or to assist in presentation, the visual result of the …

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Earthworm Abundances In Endophyte-Infected Tall Fescue Pastures In Northwest Arkansas, Ashley Rashe, Mary C. Savin Jan 2008

Earthworm Abundances In Endophyte-Infected Tall Fescue Pastures In Northwest Arkansas, Ashley Rashe, Mary C. Savin

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

The ecology of organisms that co-evolve within an ecosystem is likely to be distinct from that involving organisms recently introduced into an area. To better understand the relationship of earthworms with endophyte-infected tall fescue, earthworms in novel and toxic endophyte-infected tall fescue pastures were enumerated and identified as adults or juveniles. We hypothesized that differences in endophyte infection of the fescue would influence earthworm abundances. Earthworms in two toxic and two novel endophyte-infected tall fescue fields in Fayetteville, Ark., were sampled weekly from January through July 2007. Each type of endophyte-infected pasture was established in 1997 and 2003. Sampling was …

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Journal Of The Arkansas Academy Of Science - Volume 61 2007, Academy Editors Jan 2007

Journal Of The Arkansas Academy Of Science - Volume 61 2007, Academy Editors

Journal of the Arkansas Academy of Science

No abstract provided.

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Distribution Of The Queen Snake (Regina Septemvittata) In Arkansas, Johnathan W. Stanley, Stanley E. Trauth Jan 2007

Distribution Of The Queen Snake (Regina Septemvittata) In Arkansas, Johnathan W. Stanley, Stanley E. Trauth

Journal of the Arkansas Academy of Science

We documented the distribution of the queen snake, Regina septemvittata, in northern Arkansas during the 2005 and 2006 activity seasons. Arkansas currently contains the only known disjunct population of this species west of the Mississippi River. Field work was conducted throughout the Boston Mountains of the Ozark Plateau to verify the presence of queen snakes from historic localities as well as to identify new localities containing these snakes. Seventeen individuals were found in the Mulberry River of Franklin and Johnson counties and the Illinois Bayou watershed of Pope County. Of these 17 snakes, 5 were kept as voucher specimens in …

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91st Annual Meeting, 2007. Program, Academy Editors Jan 2007

91st Annual Meeting, 2007. Program, Academy Editors

Journal of the Arkansas Academy of Science

No abstract provided.

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Quantification And Prediction Of Stream Dryness In The Interior Highlands, Justin M. Homan, Nicholas M. Girondo, Charles J. Gagen Jan 2005

Quantification And Prediction Of Stream Dryness In The Interior Highlands, Justin M. Homan, Nicholas M. Girondo, Charles J. Gagen

Journal of the Arkansas Academy of Science

Although ecological studies have noted streams drying in the Interior Highlands, published measurements of streambed dryness are lacking. Clearly, stream drying has the potential to affect benthic macroinvertebrate and fish communities. In 2003, we initiated an assessment of streambed dryness for three streams in the Ouachita Mountains representative of the Central Hills, Ridges, and Valleys. In the following summer, we applied the approach to 15 similar size watersheds in three distinct ecoregions of the Interior Highlands: Ouachita Mountains-Athens Plateau, Ozark Highlands-Springfield Plateau, and Lower Boston Mountains. Repeated dryness measurements were recorded in each stream and correlated to nearby USGS stream …

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Deer-Vehicle Collisions In Arkansas, Philip A. Tappe Jan 2005

Deer-Vehicle Collisions In Arkansas, Philip A. Tappe

Journal of the Arkansas Academy of Science

No abstract provided.

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Dragonflies (Odonata) Of The Ouachita National Forest, George L. Harp, Phoebe A. Harp Jan 2003

Dragonflies (Odonata) Of The Ouachita National Forest, George L. Harp, Phoebe A. Harp

Journal of the Arkansas Academy of Science

The Ouachita National Forest (ONF) was established in 1907 and encompasses 1.8 million acres (728,450 ha) in Arkansas and Oklahoma, almost entirely within the Ouachita Mountains Natural Division. The adult dragonfly species richness, seasonal and spatial distribution, and relative abundance were surveyed during 2002. Fifty-four collections were made at 43 sites during 10-19 May (20 collections), 10-22 July (19 collections) and 9-17 September (15 collections). Literature records were searched, as well as records from pertinent museums and individuals. Eighty-three species are reported here for the ONF, 77 of which were collected during 2002. Nehallenia integricollis newly reported for Arkansas, as …

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Millipeds (Arthropoda: Diplopoda) Of The Ark-La-Tex. Ii. Distributional Records For Some Species Of Western And Central Arkansas And Easter And Southeastern Oklahoma, Chris T. Mcallister, Rowland M. Shelley, James T. Mcallister Iii Jan 2002

Millipeds (Arthropoda: Diplopoda) Of The Ark-La-Tex. Ii. Distributional Records For Some Species Of Western And Central Arkansas And Easter And Southeastern Oklahoma, Chris T. Mcallister, Rowland M. Shelley, James T. Mcallister Iii

Journal of the Arkansas Academy of Science

We collected millipeds between November 2001 and March 2002 at several sites in the Ouachita Provinces of western (Garland, Hot Spring, Pike, and Polk counties) and central Arkansas (Pulaski County) and the Ouachita and Kiamichi Provinces of southeastern Oklahoma (LeFlore and McCurtain counties). The following millipeds were found: Eurymerodesmus dubius, Auturus louisianus louisianus, Pseudopolydesmus pinetorum, and Cambala minor in Garland County; Eurymerodesmus sp., A. I. louisianus, P. pinetorum, and juveniles of the family Parajulidae (tribe Aniulini) from Hot Spring County; E. dubius, A. I. louisianus, and juveniles of the family Cleidogonidae from Pike County; Brachycybe lecontei, A. I. louisianus, Abacion …

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Life History Of The River Shiner, Notropis Blennius (Cyprinidae), In The Arkansas River Of Western Arkansas, Laura Hudson, Thomas M. Buchanan Jan 2001

Life History Of The River Shiner, Notropis Blennius (Cyprinidae), In The Arkansas River Of Western Arkansas, Laura Hudson, Thomas M. Buchanan

Journal of the Arkansas Academy of Science

The reproductive cycle, food habits, and age and growth of the river shiner, Notropis blennius (Girard), in the Arkansas River of western Arkansas were studied from May 1996 through October 1997. Based on gonadosomatic indices and mean ovumd iameters of females, tubercle development in males, and the first appearance of young-of-year in samples, the breeding season extended from June through August in both 1996 and 1997. The river shiner is a diurnal, generalist feeder that forages on a wide variety of food items. In all four seasons, detritus dominated the diets of adults and juveniles in terms of volume and …

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Distribution Of Leconte's Free-Tailed Bat (Tadarida Brasiliensis Cynocephala) In Arkansas, With Notes On Reproduction And Natural History, David A. Saugey, D. Blake Sasse, J. D. Wilhide, Drew Reed, Tammy R. Jones, Darrell R. Heath, Daniel R. England Jan 2001

Distribution Of Leconte's Free-Tailed Bat (Tadarida Brasiliensis Cynocephala) In Arkansas, With Notes On Reproduction And Natural History, David A. Saugey, D. Blake Sasse, J. D. Wilhide, Drew Reed, Tammy R. Jones, Darrell R. Heath, Daniel R. England

Journal of the Arkansas Academy of Science

During the past 20 years (1982-2001) we have studied the biology, occurrence and distribution of LeConte's (Brazilian) free-tailed bat, Tadarida brasiliensis cynocephala, in Arkansas. Colonies and individuals were reported from man made structures only. Four new county records have been documented since 1988, extending the range from the central part of the state to Arkansas's northern-most tier of counties. Numerous nuisance maternity colonies were investigated during exclusion activities and one, year-round colony provided the majority of reproductive data. A total of 152 free-tailed bats was submitted to the Arkansas Department of Health Rabies Laboratory (1982-2001); most during February through April, …

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The Loop: A Plan For The Future Of Rogers, Rebecca L. Turner Jan 2000

The Loop: A Plan For The Future Of Rogers, Rebecca L. Turner

Inquiry: The University of Arkansas Undergraduate Research Journal

Storm water management in urban areas is not only a necessary infrastructure, it is also a valuable resource to provide an aesthetic experience for the public while furthering ecological awareness, recreation, and the cultural fabric. Through the restructuring of current development ordinances and through greater attention to the true needs of the natural and built communities, storm water management becomes the tool to breach the gap between man and nature. Rogers, Arkansas, a city of exciting and alarming growth, maintains traditional planning and environmental practices that have created a center of disequilibrium among the natural and built systems. Local streams …

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Floristic Status Of Log Ferns (Dryopteris) In Arkansas, James H. Peck Jan 2000

Floristic Status Of Log Ferns (Dryopteris) In Arkansas, James H. Peck

Journal of the Arkansas Academy of Science

The fern flora of Arkansas consists of 96 taxa, including five species and three hybrids of the Log Fern genus Dryopteri This report summarizes a twenty year floristic and ecologic study of their distribution and abundance in Arkansas. Historica data are presented to review the slow accumulation of taxa reported in floras of Arkansas from early collectors to 1980 and the rapid accumulation of taxa since 1980 employing modern field techniques. Chorological data and floristic data are presented based on field, herbarium, and literature studies to correct the record and document the known localities of the eight Arkansas taxa: Dryopteris …

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Home Ranges And Movements Of Adult Deer On Fort Chaffee, Arkansas, Gregory G. Humphreys, Thomas A. Nelson Jan 2000

Home Ranges And Movements Of Adult Deer On Fort Chaffee, Arkansas, Gregory G. Humphreys, Thomas A. Nelson

Journal of the Arkansas Academy of Science

We radio-tracked 27 white-tailed deer (Odocoileus virginianus) weekly for one year on Fort Chaffee, Arkansas, to investigate their seasonal home ranges and movements between hunted areas and refuges on this military base. This work resulted in2,123 separate radiolocations, of which 85% (1,799) were suitable for use in home range analyses. We used the McPAAL computer package to estimate home range using the Harmonic Mean and minimum convex polygon (MCP) methods. Harmonic mean estimates were based on 95% contour lines. Home range size differed between the sexes and methods. Male home ranges were larger than those of females (t= 3.32, P<0.01; harmonic mean) (t=2.07, P<0.05; MCP). Average home range sizes for males and females based on the harmonic mean method were estimated to be 483 ha and 181 ha, respectively, whereas home range estimates for males and females using the MCP method were 636 ha and 289 ha, respectively. The average home range size for all deer was 259 ha (harmonic mean) and 379 ha (MCP). We found no evidence that females restricted their home ranges during the fawning period. However, females' home ranges expanded during the breeding season, perhaps to find mates. Few deer moved to refuge areas that were off-limits to hunters during the hunting season.

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Directory Of Water Related Courses Offered At Colleges And Universities In Arkansas As Of November 1998, Kenneth F. Steele Sep 1998

Directory Of Water Related Courses Offered At Colleges And Universities In Arkansas As Of November 1998, Kenneth F. Steele

Arkansas Water Resources Center Technical Reports

This publication lists the water and water-related courses at several universities and colleges in Arkansas as reported during the Fall of 1 998. It is anticipated that users of this directory will extend beyond college students, and will include professionals seeking continuing education, and professors desiring to exchange Information on courses. This directory is not an "absolute" source of water and water-related courses because all of the higher learning Institutions In Arkansas are not listed, and, secondly, because the definition of "water and water-related" varies from institution to institution. None-the-less this directory provides a very valuable and impressive reference on …

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Directory Of Water Related Courses Offered At Colleges And Universites In Arkansas, Kenneth F. Steele Nov 1996

Directory Of Water Related Courses Offered At Colleges And Universites In Arkansas, Kenneth F. Steele

Arkansas Water Resources Center Technical Reports

This publication lists the water and water-related courses at several universities and colleges in Arkansas as reported during the Fall of 1996. It Is anticipated that users of this directory will extend beyond college students, and will include professionals seeking continuing education, and professors desiring to exchange information on courses. This directory is not an "absolute" source of water and water-related courses because all of the higher learning institutions in Arkansas are not listed, and, secondly, because the definition of "water and water-related" varies from institution to institution. None-the-less this directory provides a very valuable and impressive reference on water …

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Arkansas Rice Research Studies 1995, R. J. Norman, B. R. Wells Aug 1996

Arkansas Rice Research Studies 1995, R. J. Norman, B. R. Wells

Arkansas Agricultural Experiment Station Research Series

The research reports in this publication represent one year of results; therefore, these results should not be used as a basis for long-term recommendations. Several research reports in this publication dealing with soil fertility also appear in Arkansas Soil Fertility Studies 1995 , Arkansas Agricultural Experiment Station Research Series 450. This duplication is the result of the overlap in research coverage between the two series and our effort to inform Arkansas rice producers of all the research being conducted with funds from the rice check-off. Use of products and trade names in any of the research reports of this publication …

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Ultrastructure Of Cepedietta Virginiensis (Protista: Haptophrynidae), From The Gall Bladder Of The Pickerel Frog, Rana Palustris, In Arkansas, Chris T. Mcallister, Stanley E. Trauth Jan 1996

Ultrastructure Of Cepedietta Virginiensis (Protista: Haptophrynidae), From The Gall Bladder Of The Pickerel Frog, Rana Palustris, In Arkansas, Chris T. Mcallister, Stanley E. Trauth

Journal of the Arkansas Academy of Science

No abstract provided.

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One-Year Study Of The Species Diversity And Relative Abundance Of Snakes And Lizards In The Jack Mountain Region Of Hot Springs County, Arkansas, Vincent A. Cobb, Jeff A. Summerhill Jan 1996

One-Year Study Of The Species Diversity And Relative Abundance Of Snakes And Lizards In The Jack Mountain Region Of Hot Springs County, Arkansas, Vincent A. Cobb, Jeff A. Summerhill

Journal of the Arkansas Academy of Science

No abstract provided.

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Female Reproductive Traits In Selected Arkansas Snakes, Stanley E. Trauth, Robert L. Cox, Walter E. Meshaka Jr., Brian P. Butterfield, Anthony Holt Jan 1994

Female Reproductive Traits In Selected Arkansas Snakes, Stanley E. Trauth, Robert L. Cox, Walter E. Meshaka Jr., Brian P. Butterfield, Anthony Holt

Journal of the Arkansas Academy of Science

Female reproductive characteristics of 17 genera of Arkansas snakes (27 species and subspecies) were examined. Most of the snakes (n= 495) were collected over a 10-year span (1984-1993). Methods used to estimate clutch and/or litter size were as follows: 1) counts of previtellogenic ovarian follicles,2) counts of vitellogenic ovarian follicles,3) counts of oviductal eggs or embryos, 4) counts of corpora luteal scars, and 5) counts of neonates from egg clutches or litters. In several species, Method 1 tended to overestimate clutch size as determined by Method 2 by as much as 100% (e.g., in Diadophis punctatus, Elaphe obsoleta, and Lampropeltis …

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Comparative Gas-Exchange In Leaves Of Intact And Clipped, Natural And Planted Cherrybark Oak (Quercus Pagoda Raf.) Seedlings, Brian Roy Lockhart, John D. Hodges Jan 1994

Comparative Gas-Exchange In Leaves Of Intact And Clipped, Natural And Planted Cherrybark Oak (Quercus Pagoda Raf.) Seedlings, Brian Roy Lockhart, John D. Hodges

Journal of the Arkansas Academy of Science

Gas-exchange measurements, including CO2 -exchange rate (net photosynthesis), stomatal conductance, and transpiration, were conducted on intact and clipped cherrybark oak (Quercus pagoda Raf.) seedlings growing in the field and in a nursery bed. Seedlings in the field, released from midstory and understory woody competition, showed significant increases in gas-exchange compared to non-released seedlings due to increases in light levels reaching seedlings. Concurrently, little difference occurred in the CO2 -exchange rate between intact and clipped seedlings in the released treatment although clipped seedlings maintained a consistently greater rate of stomatal conductance. In order to reduce the high variability of light levels …

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Botanical Survey Of A Cypress-Tupelo Swamp, Veryl V. Board, Charlotte Allen, Andrea Reeves Jan 1993

Botanical Survey Of A Cypress-Tupelo Swamp, Veryl V. Board, Charlotte Allen, Andrea Reeves

Journal of the Arkansas Academy of Science

Collection of plants from a cypress-tupelo swamp located at the eastern border of Independence County was part of a long range plan to document the flora of the county. Efforts were made to determine if the study area would fit the current federal definition of wetlands which requires aperiodic or permanent inundation of the soil.

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Larval Chironomids Of The St. Francis Sunken Lands In Northeast Arkansas, Betty G. Cochran, Edmond J. Bacon Jr., George L. Harp Jan 1993

Larval Chironomids Of The St. Francis Sunken Lands In Northeast Arkansas, Betty G. Cochran, Edmond J. Bacon Jr., George L. Harp

Journal of the Arkansas Academy of Science

Sixty semi-annual collections (August 1987-July 1988) were made from 30 stations by sampling each station twice for 1.5 man-hours with an aquatic dipnet. Larval chironomids were mounted on slides and identified at 400-1000 magnifications using a Leitz Dialux 20 EB microscope. A survey of the aquatic macroinvertebrates of the St. Francis Sunken Lands in northeast Arkansas revealed 36 taxa of Order Diptera, Family Chironomidae. The taxa were used to evaluate the general health of the aquatic environment. Stations that were located within the least disturbed areas, which were old river channels and oxbows, contained the highest number of organisms and …

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Arkansas Range Extensions Of The Eastern Small-Footed Bat (Myotis Leibii) And Northern Long-Eared Bat (Myotisseptentrionalis) And Additional County Records For The Silver-Haired Bat (Lasionycteris Noctivagans), Hoary Bat (Lasiurus Cinereus), Southeastern Bat (Myotis Austroriparius), And Rafinesque's Big-Eared Bat (Plecotus Rafinesquii), David A. Saugey, V. Rick Mcdaniel, Daniel R. England, Marsha C. Rowe, Laura R. Chandler-Mozisek, Betty G. Cochran Jan 1993

Arkansas Range Extensions Of The Eastern Small-Footed Bat (Myotis Leibii) And Northern Long-Eared Bat (Myotisseptentrionalis) And Additional County Records For The Silver-Haired Bat (Lasionycteris Noctivagans), Hoary Bat (Lasiurus Cinereus), Southeastern Bat (Myotis Austroriparius), And Rafinesque's Big-Eared Bat (Plecotus Rafinesquii), David A. Saugey, V. Rick Mcdaniel, Daniel R. England, Marsha C. Rowe, Laura R. Chandler-Mozisek, Betty G. Cochran

Journal of the Arkansas Academy of Science

We continued field studies of bats in non-cave regions of Arkansas from 1989 to present and utilized specimens submitted to the Arkansas Department of Health Rabies Laboratory to establish Arkansas range extensions for the eastern smallfooted bat (Myotis leibii) and northern long-eared bat (Myotisseptentrionalis). In addition, we documented additional county records for the silver-haired bat (Lasionycteris noctivagans), hoary bat (Lasiurus cinereus), southeastern bat (Myotis austroriparius), and Rafinesque's big-eared bat (Plecotus rafinesquii).

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Status Of The Ozark Hellbender, Cryptobranchus Bishopi (Urodela: Cryptobranchidae), In The Spring River, Fulton County, Arkansas, Stanley E. Trauth, J. D. Wilhide, Patrick Daniel Jan 1992

Status Of The Ozark Hellbender, Cryptobranchus Bishopi (Urodela: Cryptobranchidae), In The Spring River, Fulton County, Arkansas, Stanley E. Trauth, J. D. Wilhide, Patrick Daniel

Journal of the Arkansas Academy of Science

We conducted a tag and release study of the Ozark hellbender along a 26 km stretch of the Spring River from mid-July through mid-November, 1991, to determine current population levels. Salamanders were collected by hand with the aid of scuba diving equipment. Thirteen visits(36 dive hrs.) to10 selected access sites yielded 20 animals. Compared to previously published data of the early 1980's which indicated large, striving populations of C. bishopi(in some cases, > 300 individuals) in the Spring River, our study found perilously low numbers of salamanders. This drastic decline may be attributed to over collection of specimens for scientific or …

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Measuring Shrubland Vegetational Structure Using Avian Habitats As An Example, Douglas A. James Jan 1992

Measuring Shrubland Vegetational Structure Using Avian Habitats As An Example, Douglas A. James

Journal of the Arkansas Academy of Science

Vegetational sampling of avian habitats stresses the use of methods primarily designed for forest birds. This paper describes a technique for sampling vegetational structure in uneven patchy habitats such as shrublands. Using the method, avian habitats in old field shrublands of northwestern Arkansas were analyzed.

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Biological Vectors For The Dispersal Of Colletotrichum Gloeosporioides, X. B. Yang, D. O. Tebeest, E. L. Moore Jan 1992

Biological Vectors For The Dispersal Of Colletotrichum Gloeosporioides, X. B. Yang, D. O. Tebeest, E. L. Moore

Journal of the Arkansas Academy of Science

Green treefrogs (Hyla cinerea) and grasshoppers (Melanoplus differentialis and Conocephalus fasciatus) commonly observed in Arkansas rice fields, are dispersal vectors for Colletotrichum gloeosporioides f. sp. aeschynomens, a causal agent of anthracnose of northern jointvetch. Treefrogs and grasshoppers captured from rice or soybean fields with diseased northern jointvetch were placed in containers in contact with healthy northern jointvetch plants. An average of 90% of northern jointvetch plants was infected by the pathogen with up to 10 lesions per plant using treefrog vectors. Experiments were done in the greenhouse on frog dispersal by monitoring disease development from a point source in closed …

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Past And Present Distribution Of The Red-Cockaded Woodpecker Picoides Borealis And Its Habitat In The Ouachita Mountains, Arkansas, Joseph C. Neal, Warren G. Montague Jan 1991

Past And Present Distribution Of The Red-Cockaded Woodpecker Picoides Borealis And Its Habitat In The Ouachita Mountains, Arkansas, Joseph C. Neal, Warren G. Montague

Journal of the Arkansas Academy of Science

Within the past 15 years, at least 41 and probably more active cavity tree clusters (or colonies) of Red cockaded Woodpeckers (Picoides borealis) have existed in remnant, mature shortleaf pine (Pinus echinata) woodlands in the Ouachita Mountains of Arkansas. These clusters were located on both private timberlands and in the Ouachita National Forest. Fewer than half of this number were still active in early 1991, and none remained on private timberlands. The species is presently restricted to the xeric, western margins of the Ouachitas in Scott and Polk counties within the confines of the Ouachita National Forest where it receives …

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Distribution, Scutellation, And Reproduction In The Queen Snake, Regina Septemvittata (Serpentes: Colubridae), From Arkansas, Stanley E. Trauth Jan 1991

Distribution, Scutellation, And Reproduction In The Queen Snake, Regina Septemvittata (Serpentes: Colubridae), From Arkansas, Stanley E. Trauth

Journal of the Arkansas Academy of Science

The queen snake, Regina septemvittata, has a disjunct portion of its distribution in Arkansas. This rare, crayfish-eating species is best known from only a few isolated populations from several major streams that flow out of the Boston Mountains of the Ozark Plateau. A field study of this species was conducted during the summer of 1990, and only 4 specimens were documented. Gravid females were collected in July; sperm production was also noted in July. Parturition presumably takes place in August or early September. This species may qualify as threatened or endangered in Arkansas.

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Identifying Colibri Hummingbirds Occurring In Arkansas Using Indirect Measurements, Douglas A. James Jan 1991

Identifying Colibri Hummingbirds Occurring In Arkansas Using Indirect Measurements, Douglas A. James

Journal of the Arkansas Academy of Science

No abstract provided.

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