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University of Arkansas, Fayetteville

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Articles 5161 - 5190 of 5639

Full-Text Articles in Life Sciences

Phytoplankton Community Structure In Dardanelle Reservoir, Arkansas, 1975-1982, John D. Rickett, Robert L. Watson Jan 1983

Phytoplankton Community Structure In Dardanelle Reservoir, Arkansas, 1975-1982, John D. Rickett, Robert L. Watson

Journal of the Arkansas Academy of Science

Phytoplankton data were collected with standard equipment and procedures over an eight-year period (1975-1982) in Dardanelle Reservoir, Arkansas. Community abundance and diversity at the genus level are described. Sixty-five genera representing 35 families and five divisions were identified. Total phytoplankton abundance and diversity were quite uniform among the stations but fluctuated considerably with time. These fluctuations did not correspond clearly with season. Dominant taxa were seasonal, though, with diatoms being usually dominant in January, April and October, and blue-greens dominant in July. The phytoplankton community structure has not been significantly altered by the operation of ANO Unit I.

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Zooplankton Community Structure In Dardanelle Reservoir, Arkansas, 1975-1982, John D. Rickett, Robert L. Watson Jan 1983

Zooplankton Community Structure In Dardanelle Reservoir, Arkansas, 1975-1982, John D. Rickett, Robert L. Watson

Journal of the Arkansas Academy of Science

Zooplankton was collected at 10 stations in Dardanelle Reservoir from 1975 to 1982. Current data were compared to a five-year preoperational study phase. Rotifer taxa strongly dominated the community. Overall abundance was higher, variety about the same and diversity lower than those of comparable studies. Thermal discharges caused a dominance shift between two rotifer taxa, slightly depressed abundance and variety, did not noticeably affect diversity and elevated the phytoplankton/zooplankton ratio. Heated effluent also stimulated stronger fluctuations in abundance and variety. Other studies indicate that in upper sections of the Arkansas River drainage, microcrustaceans dominate lake habitats whereas rotifers dominate river …

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Fishes Of The Antoine River, Little Missouri River System, Southwestern Arkansas, Henry W. Robison, Elaine Laird, Darryl Koym Jan 1983

Fishes Of The Antoine River, Little Missouri River System, Southwestern Arkansas, Henry W. Robison, Elaine Laird, Darryl Koym

Journal of the Arkansas Academy of Science

The fishes of the Antoine River (Little Missouri River system) in southwestern Arkansas were surveyed from September, 1980 - June, 1982. Thirty-four field collections plus literature and museum records, revealed a total of 60 species in 29 genera representing 16 families to presently inhabit the river system. Comments are presented on life history aspects, systematics and occurrence of fishes in the study area.

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Range Extension Of The Silver Carp, Hypophthalmichthys Molitrix, F. Allen Carter, John K. Beadles Jan 1983

Range Extension Of The Silver Carp, Hypophthalmichthys Molitrix, F. Allen Carter, John K. Beadles

Journal of the Arkansas Academy of Science

No abstract provided.

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Sicklefin Chub, Hybopsis Meeki, In The Mississippi River Bordering Arkansas, F. Allen Carter, John K. Beadles Jan 1983

Sicklefin Chub, Hybopsis Meeki, In The Mississippi River Bordering Arkansas, F. Allen Carter, John K. Beadles

Journal of the Arkansas Academy of Science

No abstract provided.

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Repair Of Ultraviolet And Gamma-Ray Induced Lethal Damage In An Insect Tissue Culture Cell Line, Craig Endres, Susan Kulp, H. Gaston Griggs Jan 1983

Repair Of Ultraviolet And Gamma-Ray Induced Lethal Damage In An Insect Tissue Culture Cell Line, Craig Endres, Susan Kulp, H. Gaston Griggs

Journal of the Arkansas Academy of Science

No abstract provided.

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Preliminary Report On The Zygoptera (Damselflies) Of Arkansas, George L. Harp Jan 1983

Preliminary Report On The Zygoptera (Damselflies) Of Arkansas, George L. Harp

Journal of the Arkansas Academy of Science

No abstract provided.

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Aquatic Macroinvertebrates Of The Hiatt Prairie Region, Franklin County, Arkansas, Julie A. Huggins, George L. Harp Jan 1983

Aquatic Macroinvertebrates Of The Hiatt Prairie Region, Franklin County, Arkansas, Julie A. Huggins, George L. Harp

Journal of the Arkansas Academy of Science

No abstract provided.

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Development Of Tissue Culture Systems For The Evaluation Of Cancer Chemotherapeutic Agents, Clifton Orr, Joseph E. Stone, Maxine L. Polk Jan 1983

Development Of Tissue Culture Systems For The Evaluation Of Cancer Chemotherapeutic Agents, Clifton Orr, Joseph E. Stone, Maxine L. Polk

Journal of the Arkansas Academy of Science

No abstract provided.

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First Report Of Brazilian Free-Tailed Bat Maternity Colonies In Arkansas, David A. Saugey, Darrell R. Heath, Clark Efaw, Gary A. Heidt, Teresa E. Beggs Jan 1983

First Report Of Brazilian Free-Tailed Bat Maternity Colonies In Arkansas, David A. Saugey, Darrell R. Heath, Clark Efaw, Gary A. Heidt, Teresa E. Beggs

Journal of the Arkansas Academy of Science

No abstract provided.

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New County And State Records Of Mosses From Arkansas, Steve L. Timme, Jewel E. Moore Jan 1983

New County And State Records Of Mosses From Arkansas, Steve L. Timme, Jewel E. Moore

Journal of the Arkansas Academy of Science

No abstract provided.

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Mosquitofish Production In Monoculture And Polyculture Ponds, Walter R. Robison, Scott H. Newton, Max V. Meisch Jan 1983

Mosquitofish Production In Monoculture And Polyculture Ponds, Walter R. Robison, Scott H. Newton, Max V. Meisch

Journal of the Arkansas Academy of Science

No abstract provided.

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Effects Of Sewage Pollution In The White River, Arkansas, Arthur V. Brown, Lawrence D. Willis, Peter P. Brussock Jan 1983

Effects Of Sewage Pollution In The White River, Arkansas, Arthur V. Brown, Lawrence D. Willis, Peter P. Brussock

Journal of the Arkansas Academy of Science

Recently there has been much emphasis placed on the importance of leaf detritus processing to the energetics of stream invertebrates. This study was designed primarily to assess the effects of municipal effluent on the ability of a stream community to utilize leaf detritus, and secondarily to evaluate the extent of the pollution of the White River by the Fayetteville, Arkansas, effluent discharge. Physical and chemical water quality and benthos were sampled periodically at one station upstream and two stations downstream from the discharge, and in the Richland Creek tributary. Processing of leaf detritus was also studied at each site using …

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Selection Of Scales For Growth Analysis Of Largemouth Bass, Donald C. Jackson, Raj V. Kilambi Jan 1983

Selection Of Scales For Growth Analysis Of Largemouth Bass, Donald C. Jackson, Raj V. Kilambi

Journal of the Arkansas Academy of Science

Scales from four regions of the body of largemouth bass were compared for efficacy in estimating fish length at the time of scale formation and at capture. The scales from above and below the lateral line in the pectoral and caudal peduncle regions yielded intercepts of 64.73, 52.36, 19.77 and 25.81 respectively for the total length-scale radius relationship. These intercept values represent the fish length at the time of scale formation. By the regression of estimated lengths at capture on empirical lengths it was found that the caudal peduncle scales were better suited in predicting fish length.

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Success Of Wild-Trapped Compared To Captivity-Raised Birds In Restoring Wild Turkey Populations To Northwestern Arkansas, Douglas A. James, L. Glen Fooks, John R. Preston Jan 1983

Success Of Wild-Trapped Compared To Captivity-Raised Birds In Restoring Wild Turkey Populations To Northwestern Arkansas, Douglas A. James, L. Glen Fooks, John R. Preston

Journal of the Arkansas Academy of Science

Reintroduction of wild turkeys into northwestern Arkansas was studied at 10 release sites in the late 1950's. Native birds trapped in southern Arkansas were released at five study areas, and birds from wild Pennsylvania stock reared in captivity were released in five other areas. Although both types of turkeys reproduced, most populations of captivity-raised turkeys decreased sharply whereas all populations of wild-trapped birds exhibited marked increases. Range extension averaged nearly 2.5 miles per year in expanding wild-trapped populations. Captivity-raised birds were comparatively tame and often were found near human habitation. Current expanding turkey populations in the Arkansas Ozarks undoubtedly are …

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Comparison Of Two Year Classes Of Hybrid Grass Carp And Grass Carp For Aquatic Plant Control, Mike Freeze, Scott Henderson Jan 1983

Comparison Of Two Year Classes Of Hybrid Grass Carp And Grass Carp For Aquatic Plant Control, Mike Freeze, Scott Henderson

Journal of the Arkansas Academy of Science

Two year classes of grass carp and F, hybrids resulting from bighead carp male x grass carp female were compared at various stocking densities for aquatic plant control. One and two year old grass carp exhibited higher survival rates and better growth rates than the same age hybrid grass carp. The presence of grass carp or hybrid grass carp decreased both Secchi disc transparencies and dissolved oxygen values. Grass carp had a greater negative effect upon these measurements because they removed the vegetation quicker than the hybrid grass carp. These apparent detrimental effects on water quality are necessary trade-offs for …

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Short Creek Oolite (Lower Mississippian) Deposition, War Eagle Quarry, Madison County, Arkansas, Barbara A. Lisle Jan 1983

Short Creek Oolite (Lower Mississippian) Deposition, War Eagle Quarry, Madison County, Arkansas, Barbara A. Lisle

Journal of the Arkansas Academy of Science

The Short Creek Oolite is the only formally designated member of the Lower Mississippian Boone Formation. Although oolite deposits are often considered to be formed in shoal areas, detailed study of the War Eagle Short Creek disclosed characteristics incompatible with deposition as an oolite shoal. At the War Eagle Quarry, the Short Creek Oolite occurs between deep water strata and there is a conspicuous absence of cross-stratification and other shallow water bedding features. Modal analysis revealed a lower oolith content than found in Recent oolite shoals or in the Short Creek Oolite of Missouri, which has been interpreted as a …

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Abundance And Seasonal Occurrence Of Psorophora Columbiae In A Northeast Arkansas Ricefield Community, Larry A. Olson, Julia A. Huggins Jan 1983

Abundance And Seasonal Occurrence Of Psorophora Columbiae In A Northeast Arkansas Ricefield Community, Larry A. Olson, Julia A. Huggins

Journal of the Arkansas Academy of Science

Increased population levels of the dark ricefield mosquito, Psorophora columbiae (Dyar and Knab), have been shown to be associated with rice cultivation in Arkansas and several other states. Four standard New Jersey light traps were operated daily between May 30 and October 2 of 1981 and 1982 to determine the relative abundance and seasonal occurrence of this species in NE Arkansas. The effect of trap distance from nearby rice on the number of adult P. columbiae collected was assessed by comparing weekly totals from 2 traps located within 0.9 km of rice fields with totals from 2 traps situated beyond …

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Arkansas Range Extensions Of The Seminole Bat (Lasiurus Seminolus) And Eastern Big-Eared Bat (Plecotus Rafinesquii) And Additional County Records For The Hoary Bat (Lasiurus Cinereus), Silver-Haired Bat (Lasionycteris Noctivagans) And Evening Bat..., Darrell R. Heath, Gary A. Heidt, David A. Saugey, V. Rick Mcdaniel Jan 1983

Arkansas Range Extensions Of The Seminole Bat (Lasiurus Seminolus) And Eastern Big-Eared Bat (Plecotus Rafinesquii) And Additional County Records For The Hoary Bat (Lasiurus Cinereus), Silver-Haired Bat (Lasionycteris Noctivagans) And Evening Bat..., Darrell R. Heath, Gary A. Heidt, David A. Saugey, V. Rick Mcdaniel

Journal of the Arkansas Academy of Science

No abstract provided.

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Bryophyte-Lichen Communities Within Hot Springs National Park, Arkansas I., Jewel E. Moore, Steve L. Timme Jan 1983

Bryophyte-Lichen Communities Within Hot Springs National Park, Arkansas I., Jewel E. Moore, Steve L. Timme

Journal of the Arkansas Academy of Science

No abstract provided.

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First Host Plant Records For Chelysomidea Guttata (Herrich-Schaeffer) (Hemiptera: Scutelleridae, With Notes On The Biology And Distribution, Julia L. Reid, Harvey E. Barton Jan 1983

First Host Plant Records For Chelysomidea Guttata (Herrich-Schaeffer) (Hemiptera: Scutelleridae, With Notes On The Biology And Distribution, Julia L. Reid, Harvey E. Barton

Journal of the Arkansas Academy of Science

No abstract provided.

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New And Interesting Plants For The Arkansas Flora From Northeastern Arkansas, Edward Leon Richards Jan 1982

New And Interesting Plants For The Arkansas Flora From Northeastern Arkansas, Edward Leon Richards

Journal of the Arkansas Academy of Science

No abstract provided.

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Blood Levels Of 5-Bromo-2'-Deoxyuridine In Intraperitoneal Infusion For Determination Of Sister Chromatid Exchange Induction Using Hplc, Angelo Turturro, Narendra P. Singh, Johnny Bazare Jr., Ronald W. Hart Jan 1982

Blood Levels Of 5-Bromo-2'-Deoxyuridine In Intraperitoneal Infusion For Determination Of Sister Chromatid Exchange Induction Using Hplc, Angelo Turturro, Narendra P. Singh, Johnny Bazare Jr., Ronald W. Hart

Journal of the Arkansas Academy of Science

A new technique was developed to measure the amount of 5-bromo-2 '-deoxyurdine (BrdUrd), a thymidine analogue, rapidly and conveniently in blood, and it was applied to measure the concentration of BrdUrd during the initiation of a paradigm for the labeling of DNA to measure the induction of sister chromatid exchanges (SCE) by genotoxic agents. Radio labelled BrdUrd was used and blood was drawn from the abdominal aorta in pregnant Sprague-Dawley derived D rats. Using the hplc, the BrdUrd peak was easily identifiable and separable from its metabolites. The BrdUrd level in the blood stabilized in 30 minutes, and a level …

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Aquatic Macroinvertebrates Of Three Acid Bogs On Crowley's Ridge In Northeast Arkansas, Jerry L. Farris, George L. Harp Jan 1982

Aquatic Macroinvertebrates Of Three Acid Bogs On Crowley's Ridge In Northeast Arkansas, Jerry L. Farris, George L. Harp

Journal of the Arkansas Academy of Science

Qualities and quantities of parameters composing the bog systems in Northeast Arkansas are not entirely reflective of those defining bogs of the northern United States. While pH is restricting to the organisms of each bog studied (4.8-6.9), the major limiting factor is the amount of available water. Three acidophilic bogs with shallow water depths (2-30 cm) yielded a total of 75 aquatic macroinvertebrate taxa. The bog with greatest surface area supported 67 taxa and a mean numerical standing crop of 14 organisms/2 hr sampling period. The bog with the smallest surface area had 13 taxa and a mean standing crop …

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Effect Of Stocking Density On Channel Catfish Growth, Survival And Food Conservation Efficiency In Cages, Walter R. Robison, Scott H. Newton Jan 1982

Effect Of Stocking Density On Channel Catfish Growth, Survival And Food Conservation Efficiency In Cages, Walter R. Robison, Scott H. Newton

Journal of the Arkansas Academy of Science

No abstract provided.

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Macroinvertebrate Utilization Of Leaf Detritus In A Riffle Of The Illinois River, Arkansas, Arthur V. Brown, Janet P. Ricker Jan 1982

Macroinvertebrate Utilization Of Leaf Detritus In A Riffle Of The Illinois River, Arkansas, Arthur V. Brown, Janet P. Ricker

Journal of the Arkansas Academy of Science

Small (5 g) leaf packs were placed in a shallow riffle area of the Illinois River in western Benton County, Arkansas, and sequentially retrieved after various exposure times during the winter and spring of 1980. Oak leaves (Quercus shumardii) were utilized more rapidly (9.2% remaining after 91 days), followed by oak/sycamore (Q. shumardii/Platanus occidentalis) leaf packs (31.8% remaining after 91 days). Sycamore {P. occidentalis) was the slowest processed type (32.2% remaining after 91 days). The initial colonization by shredders as characteristic of northern U S. streams did not occur in this study. Collector organisms were present in the leaf packs …

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Wild Commercial Fishery Of Arkansas, Tommie Crawford, Mike Freeze Jan 1982

Wild Commercial Fishery Of Arkansas, Tommie Crawford, Mike Freeze

Journal of the Arkansas Academy of Science

Arkansas' wild commercial fishery industry was surveyed to evaluate commercial fish products produced within the state. The total wild commercial catch for the period of 1 July 1980 to 30 June 1981 was approximately 8,680,124 kg with a value of $6,245,967. These values represent an increase of approximately 3% from the previous year. The bulk of the commercial harvest was made up of buffalo fishes (Ictiobus spp.), catfishes (Ictalurus spp), gars (Lepisosteus spp.) and carp (Cyprinus carpio). The number of commercial fishermen remained relatively unchanged from 1979-1980, with 3,843 licensed fishermen operating on the state's waterways. The number of licensed …

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Leaf Detritus Processing In An Ozark Cave Stream, Arthur V. Brown, Mark D. Schram Jan 1982

Leaf Detritus Processing In An Ozark Cave Stream, Arthur V. Brown, Mark D. Schram

Journal of the Arkansas Academy of Science

Detritus processing rates and mechanisms were investigated in an Ozark cave stream using post oak (Quercus stellata) leaf packs. The 5 g leaf packs lost ca. 30% of their dry weight within 84 days, resulting in a calculated K value of 0.05. This was an unexpectedly high rate of utilization. Diversity of invertebrates associated with the leaf packs was very low. Stygobromus ozarkensis (Amphipoda) was the only shredder. The two isopods, Caecidotea stiladactyla and Lirceus sp. were the only collectors observed other than a single species of oligochaete worm. Our data indicated that leaf detritus processing rates are virtually independent …

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Continuation Of Spider Research In Arkansas: East Central Ozark Mountain Area, Mary L. Beck, Peggy Rae Dorris Jan 1982

Continuation Of Spider Research In Arkansas: East Central Ozark Mountain Area, Mary L. Beck, Peggy Rae Dorris

Journal of the Arkansas Academy of Science

A preliminary study of spiders concentrated in the eastern section of the Ozark Mountain Area was made for the purpose of determining spider fauna in an on-going research effort to elucidate the total spider fauna of the entire state. At present, 247 species of spiders have been reported.

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Soil Traversing Arthropod Populations As Sampled By Pitfall Traps In Sunflower And Three Adjacent Habitats In Northeast Arkansas, Linda A. Lee, Harvey E. Barton Jan 1982

Soil Traversing Arthropod Populations As Sampled By Pitfall Traps In Sunflower And Three Adjacent Habitats In Northeast Arkansas, Linda A. Lee, Harvey E. Barton

Journal of the Arkansas Academy of Science

Soil traversing arthropod populations were sampled by pitfall traps in sunflower (Helianthus spp.) and three adjacent habitats during the months of July, August and September of 1980 and May, June, July and August of 1981. In1980, four varieties of sunflower (Ellar, Hybrid 670, 891 and S-345) were planted. A single variety of sunflower (Ellar) was planted in1981. The three adjacent habitats in both 1980 and 1981 were a pine stand, grass border and fence row. Of 1,748 specimens collected in 1980, 17 orders and 48 families were represented. Four orders comprised 78% of the total catch: Hymenoptera (45%), Acari (17%), …

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