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Articles 18931 - 18960 of 19782
Full-Text Articles in Life Sciences
Addendum To "Fishes Of The Fourche River" In North Central Arkansas, Steve M. Bounds
Addendum To "Fishes Of The Fourche River" In North Central Arkansas, Steve M. Bounds
Journal of the Arkansas Academy of Science
No abstract provided.
Distribution, Habitat Notes, And The Status Of The Ironcolor Shiner, Notropis Chalybaeus Cope, In Arkansas, Henry W. Robison
Distribution, Habitat Notes, And The Status Of The Ironcolor Shiner, Notropis Chalybaeus Cope, In Arkansas, Henry W. Robison
Journal of the Arkansas Academy of Science
Field work throughout Arkansas since 1971 and a search of museum records have yielded 35 collections of the iron color shiner, Notropis chalybaeus Cope (Cyprinidae), not previously documented in Arkansas. From these data the iron color shiner is considered to be confined to the Coastal Plain physiographic province of Arkansas below the Fall Line, becoming most abundant in the Ouachita and Red River drainages of southern Arkansas. Notes on habitat preference, species associates, and current status of N. chalybaeus within Arkansas are presented.
Algal Assemblage Distribution As Related To Seasonal Fluctuations Of Selected Metal Concentrations, Ramona G. Rice, Richard L. Meyer
Algal Assemblage Distribution As Related To Seasonal Fluctuations Of Selected Metal Concentrations, Ramona G. Rice, Richard L. Meyer
Journal of the Arkansas Academy of Science
Seasonal variations of phytoplankton assemblages have been observed in a mildly eutrophic lake in northwestern Arkansas for six years. The data indicated that certain metal concentrations also varied seasonally. Sodium, potassium, calcium and magnesium ion concentrations, and phytoplankton composition and abundances were examined spatially and temporally. Four major algal blooms characterized the lake: a spring, a summer and an autumnal cyanophycean assemblage and a winter diatom-chrysophyte dominated population. Each metal concentration was inversely proportional to the abundance of the cyanophytes. The presence of the winter assemblage was accompanied by decreases in sodium, calcium and magnesium and increased levels of potassium. …
Attraction Of Aerial Insects As A Fish Food Supplement, Andrew J. Merkowsky, Ambus J. Handcock, Scott H. Newton
Attraction Of Aerial Insects As A Fish Food Supplement, Andrew J. Merkowsky, Ambus J. Handcock, Scott H. Newton
Journal of the Arkansas Academy of Science
Insect populations over a 1.2 hectare southeast Arkansas livestock pond were sampled to consider the possibility of their use as a fish food supplement. A commercial insect attraction unit was suspended above the pond, and attracted insects were collected. Insect populations were sampled 3-4 nights each month, January-December, 1976. Insects collected were identified and analyses were performed to determine nutritional composition and pesticide content. Insect samples were variable, however, 62% of the insects identified were in the Order Diptera and 97% of these were in the Family Chironomidae. Nutritional analyses revealed insects were more than 60% crude protein. Pesticide analysis …
The Distribution Of Cane, Arundinaria Gigante (Poaceae: Bambusoideae), Daniel L. Marsh
The Distribution Of Cane, Arundinaria Gigante (Poaceae: Bambusoideae), Daniel L. Marsh
Journal of the Arkansas Academy of Science
The distribution of cane in the United States was compiled on a county basis from previous records, correspondence, and field work. Ecological correlations were considered. The range appears to be limited primarily by temperature and precipitation. Two geographic populations correlate with major drainage divisions. The broad ecologic amplitude of cane is indicated by its occurrence in many different community types.
Cave Fauna Of Arkansas: Vertebrate Taxa, V. Rick Mcdaniel, James E. Gardner
Cave Fauna Of Arkansas: Vertebrate Taxa, V. Rick Mcdaniel, James E. Gardner
Journal of the Arkansas Academy of Science
The second in a series of papers describing the fauna of Arkansas caves includes distributional records and ecological status (as a cavernicole) of 53 vertebrate taxa, including: 3 fishes, 7 salamanders, 6 frogs, 3 lizards, 7 snakes, one turtle, 3 birds, and 23 mammals. Several of the taxa occur on state lists of endangered species, but records accumulated during the past 5 years indicate the need for a reevaluation of the actual populational status of these organisms.
Growth, Mortality, Food Habits, And Fecundity Of The Buffalo River Smallmouth Bass, Raj V. Kilambi, Walter R. Robison, James C. Adams
Growth, Mortality, Food Habits, And Fecundity Of The Buffalo River Smallmouth Bass, Raj V. Kilambi, Walter R. Robison, James C. Adams
Journal of the Arkansas Academy of Science
Total length-scale radius, and length-weight relationships were determined for smallmouth bass from the Buffalo River. The back calculated lengths were used in analyzing the age-length data by the Bertalanffy growth formula. Asymptotic length and weight were estimated as 58.3 cm and 4.6 lbs, respectively. Annual mortality of 36 percent was estimated by the catch curve method. Insects (54%), fishes (16%), and crayfish (14%) were the abundant food organisms by frequency of occurrence; while fishes (64%) and crayfish (29%) were the dominant food items by the gravimetric method. Based on the gonosomatic indices and frequency distribution of ovum diameter measurements, smallmouth …
Fishes Of The Eleven Point River Within Arkansas, Michael B. Johnson, John K. Beadles
Fishes Of The Eleven Point River Within Arkansas, Michael B. Johnson, John K. Beadles
Journal of the Arkansas Academy of Science
A survey of the fishes of the Eleven Point River and its tributaries was made between 31 January 1976 and 13 February 1977. Sixty-three collections, literature records and personal communications revealed 90 species distributed among 19 families. This study revealed 31 species previously not reported for this river system. The Eleven Point River is a clear, predominantly springfed Ozark stream which is located in western Randolph County. From the Arkansas-Missouri state line, the Eleven Point River flows south for approximately 64 km before joining the Spring River. Terrain in the Arkansas portion of this river is rugged as the river …
Dragonflies Of (Anisoptera) Arkansas, George L. Harp, John D. Rickett
Dragonflies Of (Anisoptera) Arkansas, George L. Harp, John D. Rickett
Journal of the Arkansas Academy of Science
Previous publications have recorded 69 species of dragonflies for Arkansas. Three of these are deleted, but state records for 21 new species are reported herein, bringing the list to 87 species. Based on lists from adjacent states, an additional nine species are listed as probably occurring in Arkansas. County records are given for both naiads and adults of each species, as well as first and last capture dates for adults. Specific location and capture date are given for new state records when such data are available. The most species (39) have been reported from Washington County. Twenty-nine counties list from …
Fishes Of Crowley's Ridge In Arkansas, Robert F. Fulmer, George L. Harp
Fishes Of Crowley's Ridge In Arkansas, Robert F. Fulmer, George L. Harp
Journal of the Arkansas Academy of Science
Crowley's Ridge is one of the six natural geographic divisions of Arkansas which rises out of the Mississippi embayment as a relatively steep, uncultivated loessial mass. The ridge is drained by a network of headwater streams which are relatively clear with alkaline pH values and uniformly low alkalinity values. Carbon dioxide values were moderate and oxygen values were adequate. The fish species collected were basically headwater in composition. Isolated groups of characteristically upland species indicate that environmental quality of adjacent deltaic streams was better at one time.
Fishes Of Sylamore Creek, Stone County, Arkansas, George C. Frazier, John K. Beadles
Fishes Of Sylamore Creek, Stone County, Arkansas, George C. Frazier, John K. Beadles
Journal of the Arkansas Academy of Science
A survey of the fishes of Sylamore Creek in northcentral Arkansas yielded a total of 15,041 specimens representing 44 species, including one hybrid, distributed among 11 families. The three most abundant fishes collected were: Notropis pilsbryi Fowler, Dionda nubila (Forbes), and Notropis telescopus (Cope), respectively. Two species, Campostoma anomalum pullum (Agassiz), and N. pilsbryi, were collected at every station. Sylamore Creek is a clear predominantely spring-fed stream that originate in the Ozark Mountains of northcentral Arkansas and empties into the White River 72.3 km above Bates vilie. Sylamore Creek is composed of two branches, North and South Sylamore, which comprise …
Forest Communities Of Crowley's Ridge, G. Thomas Clark
Forest Communities Of Crowley's Ridge, G. Thomas Clark
Journal of the Arkansas Academy of Science
The forest communities of Crowley's Ridge in Arkansas were surveyed by sampling 22 selected stands which met predetermined criteria. The Importance Value (I.V.) for each woody species over one decimeter, diameter breast height (dbh), was derived from the combined values of relative density, relative dominance by basal area (B.A.), and relative frequency. Young trees under one decimeter, dbh, were assigned to three height classes from which frequency, density, and stratification data were derived. White Oak-Red Oak-Hickory is the general forest type. Its subdivisions: Oak-Hickory-Pine Forest, Mixed Oak-Hickory Forest, and White Oak-Beech Forest are advocated for practical field references. They are …
Fishes Of Randolph County, Arkansas, Steve M. Bounds, John K. Beadles, Billy M. Johnson
Fishes Of Randolph County, Arkansas, Steve M. Bounds, John K. Beadles, Billy M. Johnson
Journal of the Arkansas Academy of Science
A survey of the fishes of Randolph County in northcentral Arkansas was made between June 1973 and March 1977. Field collections, literature records, and museum specimens revealed the ichthyofauna of Randolph County to be composed of 128 species distributed among 24 families. Cyprinidae was the largest family, being represented by 34 species while Percidae was represented by 24 species. Randolph County is composed of Ozark Uplands and Coastal Plain areas. All of the stream systems flow into the Black River system with the exception of Village Creek in the southeastern corner of the county which flows into White River. The …
Scaled Chrysophyceae From Arkansas, Robert A. Andersen, Richard L. Meyer
Scaled Chrysophyceae From Arkansas, Robert A. Andersen, Richard L. Meyer
Journal of the Arkansas Academy of Science
An initial study of scaled chrysophytes from Arkansas is presented. Species include: Synura Petersenii f. Petersenii, S. spinosa f. spinosa, S. curtispina f. curtispina, S. curtispina f. reticulata, S. uvella, Mallomonas striata var. striata, M. pumilio var. pumilio, and Chrysosphaerella brevispina. Transmission electron micrographs of their siliceous scales are included.
Biosystematics Of The Abronia Villosa Complex From Southern California, Ned R. Curtis
Biosystematics Of The Abronia Villosa Complex From Southern California, Ned R. Curtis
Theses Digitization Project
No abstract provided.
Vegetation And Environmental Features Of Forest And Range Ecosystems, George A. Garrison, Ardell J. Bjugstad, Don A. Duncan, Mont E. Lewis, Dixie R. Smith
Vegetation And Environmental Features Of Forest And Range Ecosystems, George A. Garrison, Ardell J. Bjugstad, Don A. Duncan, Mont E. Lewis, Dixie R. Smith
Aspen Bibliography
This is one of the reports developed as part of the Forest-Range Environmental Study (FRES) of the Forest Service, U.S. Department of Agriculture. This report presents descriptive sketches of 34 soil-vegetation units, called ecosystems. These cover all the land area of the 48 contiguous States.
Visual Detection Of Cryptic Prey By Blue Jays (Cyanocitta Cristata), Alexandra T. Pietrewicz, Alan Kamil
Visual Detection Of Cryptic Prey By Blue Jays (Cyanocitta Cristata), Alexandra T. Pietrewicz, Alan Kamil
Avian Cognition Papers
Blue jays learned to respond differentially to the presence or absence of Catocala moths in slides. This detection of the moths by the jays was affected by the background upon which the moth was placed and its body orientation, thus providing an objective measure of crypticity. These procedures are useful for the study of visual detection of prey.
Jack Pine And Aspen Forest Floors In Northeastern Minnesota, Robert M. Loomis
Jack Pine And Aspen Forest Floors In Northeastern Minnesota, Robert M. Loomis
Aspen Bibliography
Characteristics of upland forest floors under mature jack pine and aspen in northeastern Minnesota were investigated.
Biomass Estimation For Some Shrubs From Northeastern Minnesota, David F. Grigal, Lewis F. Ohmann
Biomass Estimation For Some Shrubs From Northeastern Minnesota, David F. Grigal, Lewis F. Ohmann
Aspen Bibliography
Biomass prediction equations were developed for 23 northeastern Minnesota shrub species. The allometric function was used to predict leaf, current annual woody twig, stem, and total woody biomass (dry grams), using stem diameter class estimated to the nearest 0.25 cm class at 15 cm above ground level as the independent variable.
Natural Regeneration Of Northern Hardwoods In The Northern Great Lakes Region, Carl H. Tubbs
Natural Regeneration Of Northern Hardwoods In The Northern Great Lakes Region, Carl H. Tubbs
Aspen Bibliography
The forest types collectively known as "northern hardwoods" (Quigley and Babcock 1969) occupy nearly 100 million acres in eastern North America.
Some Individual Plant Biomass Values From Northeastern Minnesota, Lewis F. Ohmann, David F. Grigal
Some Individual Plant Biomass Values From Northeastern Minnesota, Lewis F. Ohmann, David F. Grigal
Aspen Bibliography
No abstract provided.
Forest Insect And Disease Management : Aspen Mortality At The Maroon Lake Campground, David W. Johnson, Thomas E. Hinds
Forest Insect And Disease Management : Aspen Mortality At The Maroon Lake Campground, David W. Johnson, Thomas E. Hinds
Aspen Bibliography
At the request of the White River National Forest, Dave Johnson, Plant Pathologist, FI&DM and Tom Hinds, Plant Pathologist, RMFRES, made an evaluation of aspen mortality in the Maroon Lake Campground, Aspen Ranger District during June 13 to 15, 1977. Previously, Hinds (1976) reported accelerated aspen loss in 17 campgrounds, including Maroon Lake, located throughout Colorado and New Mexico (Fig. 1).
Aspen Mortality At The Maroon Lake Campground, Aspen Ranger District, White River National Forest, David W. Johnson, Thomas E. Hinds, G.L. Downing, F.A. Dorrell
Aspen Mortality At The Maroon Lake Campground, Aspen Ranger District, White River National Forest, David W. Johnson, Thomas E. Hinds, G.L. Downing, F.A. Dorrell
Aspen Bibliography
No abstract provided.
Studies On The Grooming Behavior And Morphology Of The Freshwater Prawn, Palaemonetes Kadiakensis, Bruce E. Felgenhauer
Studies On The Grooming Behavior And Morphology Of The Freshwater Prawn, Palaemonetes Kadiakensis, Bruce E. Felgenhauer
Masters Theses
No abstract provided.
A Stream Survey Of Riley Creek, Coles County, Illinois, Using Macroinvertebrates As Indicators Of Organic Pollution, Joseph R. Rowe
A Stream Survey Of Riley Creek, Coles County, Illinois, Using Macroinvertebrates As Indicators Of Organic Pollution, Joseph R. Rowe
Masters Theses
A stream survey of Riley Creek in Coles County Illinois, was undertaken to determine ecological trends and the qualitative status of the aquatic community throughout the course of the stream.
The survey encompassed the entire length of Riley Creek from the area of its status as an intermittant waterway to its confluence with Cassel Creek. Sampling periods included the months of April, May, June, July, October and November.
Macroinvertebrate collections were made at six locations along the stream approximately equidistant from each other. The organisms were assigned tolerance levels as designated by the Illinois Environmental Protection Agency.
Physical and chemical …
Biomasse D'Un Peuplement De Peuplier Faux-Tremble Age Six Ans, René Doucet
Biomasse D'Un Peuplement De Peuplier Faux-Tremble Age Six Ans, René Doucet
Aspen Bibliography
The establishment of an experiment designed to study the effect of thinning and fertilization in a 6 year-old trembling aspen stand, provided the opportunity to determine the mass of the standing crop present at the age.
Aspects Of The Ecology Of Fish And Commercial Crustaceans Of The Blackwood River Estuary, Western Australia, R.C. J. Lenanton
Aspects Of The Ecology Of Fish And Commercial Crustaceans Of The Blackwood River Estuary, Western Australia, R.C. J. Lenanton
Fisheries Research Bulletins
Beach seine nets, set or mesh nets, otter trawls and plankton nets were used to sample fish and commercial crustaceans every two months over the period March 1974 to March 1975, and again in July 1975 at a number of stations throughout the Blackwood River estuary, Western Australia.
Aquatic Plant Communities Of East-Central Illinois, Randolph Lee Vogel
Aquatic Plant Communities Of East-Central Illinois, Randolph Lee Vogel
Masters Theses
Aquatic plant communities of east-central Illinois were studied during the late summers of 1971 and 1976. Frequencies, relative frequencies and frequency of dominance were calculated for the various taxa. At the pond level, changes in the flora over the 5-year span have taken place, usually consisting of the addition or subtraction of one species. Overall, however, it was found that the aquatic community has remained relatively static, as has the percentage of ponds lacking aquatic plants. Factors influencing distributions and sterility are discussed and it was concluded that all the factors play varying roles, but no one factor or combination …
The Bryoecology Of Montgomery County, Illinois, Elbert A. Traylor
The Bryoecology Of Montgomery County, Illinois, Elbert A. Traylor
Masters Theses
No abstract provided.
Analysis Of The Capture-Recapture Method Of Determining Fish Population Size In A Pond Community, Richard E. Hall
Analysis Of The Capture-Recapture Method Of Determining Fish Population Size In A Pond Community, Richard E. Hall
Masters Theses
No abstract provided.