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Articles 19381 - 19410 of 19768

Full-Text Articles in Ecology and Evolutionary Biology

West Midlands Development : Pastures For Sandplain Soils, Department Of Agriculture, Western Australia Jan 1968

West Midlands Development : Pastures For Sandplain Soils, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

TRIALS at the Badgingarra Research Station have indicated that many pasture species will grow in the West Midlands area.

Choice of the species most suited to any particular locality will be influenced by soil type, rainfall, grazing characteristics and possible ill-effects on stock.

The following species have been recommended.


Cockroaches And Their Control, Clee Francis Howard Jenkins Jan 1968

Cockroaches And Their Control, Clee Francis Howard Jenkins

Journal of the Department of Agriculture, Western Australia, Series 4

SEVERAL species of cockroaches are general household pests.

In this country some of the native varieties have become semi-domesticated and, in addition, two or three introduced forms are quite common.


The Role Of Adventitious Reinforcement In Operant Discrimination, Alan Kamil, John W. Davenport Jan 1968

The Role Of Adventitious Reinforcement In Operant Discrimination, Alan Kamil, John W. Davenport

Avian Cognition Papers

Rats were trained in 2 SD-SΔ discrimination experiments in which the effects of an SD-postponement contingency during SΔ and temporal regularity of SΔ duration were assessed. Experiment I showed that discrimination is markedly facilitated by the presence of an SD-postponement contingency of either fixed or variable duration. Experiment II showed that variable-duration SΔ periods in a noncontingent schedule can also greatly enhance formation of an operant discrimination. These effects were attributed to differences in the probability of adventitious reinforcement of SΔ behavior by SD events.


Ecological Study Of The Effects Of Strip Mining On The Microbiology Of Streams, Ralph H. Weaver, Harry D. Nash Jan 1968

Ecological Study Of The Effects Of Strip Mining On The Microbiology Of Streams, Ralph H. Weaver, Harry D. Nash

KWRRI Research Reports

The microflora of Cane Branch of Beaver Creek in McCreary County, Kentucky, which drains an area that was strip-mined between 1955 and 1959, was studied and compared with that of Helton Branch which drains a comparable area where there has been no mining. Differences include: the establishment of Ferrcbacillus ferrooxidans, for which procedures were developed for direct colony isolation from the stream; fewer saprophytic bacteria; more numerous and more diversified filamentous and unicellular fungi; and characteristic differences in algal flora. Representatives of 42 genera of filamentous fungi were identified. Of these, 21 were isolated only from Cane Branch. Representatives of …


Prairie Plants And Their Environment, J. E. Weaver Jan 1968

Prairie Plants And Their Environment, J. E. Weaver

Papers of John E. Weaver (1884–1956)

When, in 1916, the writer came to the University of Nebraska as a young instructor, he came with a background that well fitted him for studies in the field. His research in the grassland and adjoining forests of southeastern Washington and adjacent Idaho had been completed and a fine acquaintance had been made with methods of examining the prairie both above and below ground level (Weaver, 1915, 1917). Similar studies in the area between the Missouri River and the Rocky Mountains were now to be made, and these have resulted in many new investigations that are of both scientific and …


The Indian Mynah, John L. Long Jan 1968

The Indian Mynah, John L. Long

Journal of the Department of Agriculture, Western Australia, Series 4

THE Common or Indian Mynah (Acridotheres tristis) inhabits Afghanistan, Baluchistan, southern Russian Turkestan, India, Ceylon and the Andaman Islands.


Evaluation Of The Effects Of Reduced Transpiration Upon Soil Moisture Retention In An Aspen Stand Throughout The Growing Season In Northern Utah, Michael Zan Jan 1968

Evaluation Of The Effects Of Reduced Transpiration Upon Soil Moisture Retention In An Aspen Stand Throughout The Growing Season In Northern Utah, Michael Zan

Aspen Bibliography

No abstract provided.


Soil Moisture Recharge In Stands Of Quaking Aspen And Gambel Oak In Central Utah, James L. Boynton Jan 1968

Soil Moisture Recharge In Stands Of Quaking Aspen And Gambel Oak In Central Utah, James L. Boynton

Aspen Bibliography

No abstract provided.


Some Aspects Of The Age And Growth Of The Longear Sunfish, Lepomis Megalotis, In Arkansas Waters, Edmond J. Bacon Jr., Raj V. Kilambi Jan 1968

Some Aspects Of The Age And Growth Of The Longear Sunfish, Lepomis Megalotis, In Arkansas Waters, Edmond J. Bacon Jr., Raj V. Kilambi

Journal of the Arkansas Academy of Science

No abstract provided.


Grasshoppers And Locusts In Western Australia, Clee Francis Howard Jenkins Jan 1968

Grasshoppers And Locusts In Western Australia, Clee Francis Howard Jenkins

Journal of the Department of Agriculture, Western Australia, Series 4

GRASSHOPPERS and locusts are among the most ancient enemies of the farmer, for they figured prominently in Biblical times, and periodically throughout the ages have devastated crops in all parts of the world.


The Red-Whiskered Bulbul, John L. Long Jan 1968

The Red-Whiskered Bulbul, John L. Long

Journal of the Department of Agriculture, Western Australia, Series 4

Widely distributed in both Africa and Asia, Bulbuls are a largely tropical group of fruit eating birds ranging in size from that of a house sparrow to a blackbird.


Maturity And Spawning Periodicity Of The Gizzard Shad, Dorosoma Cepedianum, (La Sueur), In Beaver Reservoir, Raymond E. Baglin Jr., Raj V. Kilambi Jan 1968

Maturity And Spawning Periodicity Of The Gizzard Shad, Dorosoma Cepedianum, (La Sueur), In Beaver Reservoir, Raymond E. Baglin Jr., Raj V. Kilambi

Journal of the Arkansas Academy of Science

No abstract provided.


Enigma Of Penstemon Tenuis Small (Scrophulariaceae), Aileen L. Mcwilliam Jan 1968

Enigma Of Penstemon Tenuis Small (Scrophulariaceae), Aileen L. Mcwilliam

Journal of the Arkansas Academy of Science

No abstract provided.


Coreopsis Saxicola Alex. Var. Duncanii Sherff (Compositae) In Arkansas, Edwin B. Smith Jan 1968

Coreopsis Saxicola Alex. Var. Duncanii Sherff (Compositae) In Arkansas, Edwin B. Smith

Journal of the Arkansas Academy of Science

No abstract provided.


Report On The Gramineae Of The Arkansas Springfield Plateau, Albert Robinson Jr. Jan 1968

Report On The Gramineae Of The Arkansas Springfield Plateau, Albert Robinson Jr.

Journal of the Arkansas Academy of Science

No abstract provided.


Notes On Spotted Skunks (Genus Spilogale) From Western Mexico, Hugh H. Genoways, J. Knox Jones Jr. Jan 1968

Notes On Spotted Skunks (Genus Spilogale) From Western Mexico, Hugh H. Genoways, J. Knox Jones Jr.

University of Nebraska State Museum: Mammalogy Papers

Specimens of spotted skunks acquired from western Mexico by the Museum of Natural History at the University of Kansas in the past two decades add substantially to the knowledge of the species occurring in that region. Two specimens of the rare Spilogale pygmaea (one from Sinaloa and one from Oaxaca) are reported for the first time. Two subspecies of pygmy spotted skunk are recognized - S. p. pygmaea Thomas with type locality at Rosario, Sinaloa, and S. p. australis Hall with type locality at Acapulco, Guerrero.

The large spotted skunk, Spilogalepusorius, varies clinally in size form north (larger) to …


Studies On The Avifauna Of Burgner Acres, An Upland Stream-Side, Ash-Elm Forest And Its Edge, Kerry Lee Bryan Jan 1968

Studies On The Avifauna Of Burgner Acres, An Upland Stream-Side, Ash-Elm Forest And Its Edge, Kerry Lee Bryan

Masters Theses

No abstract provided.


Studies On The Planktonic Protozoa And Other Microbiota Of A Eutrophic Lake, Neil Howard Chance Jan 1968

Studies On The Planktonic Protozoa And Other Microbiota Of A Eutrophic Lake, Neil Howard Chance

Masters Theses

No abstract provided.


Christmas Greetings 1967, Jane Claire Dirks-Edmunds, Ray Edmunds Dec 1967

Christmas Greetings 1967, Jane Claire Dirks-Edmunds, Ray Edmunds

Jane Claire Dirks-Edmunds Documents

This Christmas letter from Jane Claire Dirks-Edmunds and her husband Ray Edmunds, sent to friends and family in 1967, shares experiences from their frequent travels during that year.


An Ecological Study Of The Algae And Mosses Of Cascade Springs, Wasatch County, Utah, Deanna Lynn Mccoard Aug 1967

An Ecological Study Of The Algae And Mosses Of Cascade Springs, Wasatch County, Utah, Deanna Lynn Mccoard

Theses and Dissertations

An ecological study was conducted at Cascade Springs, Wasatch county, Utah from August 1965, to June 1967. The algae and aquatic moss species were determined and ecological information about these organisms was obtained. Physical data were also collected: bicarbonates, carbonates, free carbon dioxide, hydroxides, oxygen, pH, and temperature. The physical environment of the water was found to be very constant. Tests taken at the different study sites were consistently similar, not only during each day, but all year around. No great variation of any kind was found in the water. In contrast to the water environment, the topography of the …


A Balanced Salt Culture Medium For Halteria Grandinella, Yee Wan Mark Jul 1967

A Balanced Salt Culture Medium For Halteria Grandinella, Yee Wan Mark

All-Inclusive List of Electronic Theses and Dissertations

The animals that the writer worked with liere the unicellular organisms called liaJ,tez:ia grandil.!iilJ.a• They belong to the Pl~lum Protozoa and are placed in the Class Ciliata and the Order Oligotrichia. llftltez'A gDJ}gini•U, like most protozoa, ll ve in waters but they seem to prefer qUiet pools, lakes, and ponds in which aqua i;;!c plants are growing and in which there is much organic matter.


Ecological Studies Of Native Green River Fishes Below Flaming Gorge Dam, 1964-1966, Charles David Vanicek May 1967

Ecological Studies Of Native Green River Fishes Below Flaming Gorge Dam, 1964-1966, Charles David Vanicek

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Investigations to study (1) the species composition and distribution of Green River fishes between Flaming Gorge Dam and Ouray, Utah and (2) the ecology and life history of selected native species (Colorado squafish, Ptychocheilus lucius; Colorad chub, Gila robusta; bluehead sucker, Pantosteus delphinus; and humpback sucker, Xyrauchen texanus) in Dinosaur National Monument were conducted from May, 1964, to October, 1966. A total of 23,735 fish consisting of 9 indigenous and 11 exotic species, were taken in 639 collections by electrofishing gear, gill nets, seines, and fry gear. Flaming Gorge Dam has caused a major change in …


The Distribution Of Three Taxa Of Peromyscus In Central Washington, Gay Harold Engelsen Apr 1967

The Distribution Of Three Taxa Of Peromyscus In Central Washington, Gay Harold Engelsen

All Master's Theses

One aspect of the study was to define the present ranges of all types of Peromyscus in the study area; the other to determine the extent of interfertility of the groups.


A Revision Of The Bees Of The Genus Andrena Of The Western Hemisphere. Part I. Callandrena. (Hymenoptera: Andrenidae), Wallace E. Laberge Jan 1967

A Revision Of The Bees Of The Genus Andrena Of The Western Hemisphere. Part I. Callandrena. (Hymenoptera: Andrenidae), Wallace E. Laberge

Bulletin of the University of Nebraska State Museum (1924–2023)

This paper is the first part of a monograph of the bee genus Andrena in the western hemisphere and treats the subgenus Callandrena. Available data regarding phylogeny, distribution, biology, and flower preferences are presented together with keys to separate the species, diagnoses and descriptions of the species and discussions of geographic variation when applicable. Seventy-nine species and one subspecies are recognized. Sixteen names are relegated to synonymy, one to homonymy and eight are removed from the subgenus Callandrena. The thirty-nine species new to science are: aerifera, aeripes, afimbriata, ardis, auripes, balsamorhizae, beameri, bilimeki, bullata, calvata, dreisbachorum, fulminea, fulminoides, …


Control Of Weeds In Garden Areas, Geoffrey A. Pearce Jan 1967

Control Of Weeds In Garden Areas, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

THE present-day gardener does not appear to relish the tedious job of removing weeds by hand. It is a never-ending task and no sooner is one germination controlled than another appears.

Modern herbicides provide a ready answer for overcoming the weed problem in the home garden, but it is essential to select the correct chemical and to understand its limitations.


The Indian Crow, John L. Long Jan 1967

The Indian Crow, John L. Long

Journal of the Department of Agriculture, Western Australia, Series 4

THE Indian crow occasionally reaches the shores of Australia from southern Asia via ships travelling between Indian and Australian ports.


What Are Vermin?, A R. Tomlinson Jan 1967

What Are Vermin?, A R. Tomlinson

Journal of the Department of Agriculture, Western Australia, Series 4

ACCORDING to one dictionary the term 'vermin'includes "mammals and birds injurious to game or crops", "rats and mice", "noxious insects", "parasitic worms" and even "vile persons."


Ninth Random Sample Laying Test, 1965-66, Department Of Agriculture, Western Australia Jan 1967

Ninth Random Sample Laying Test, 1965-66, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

NINTH RANDOM SAMPLE LAYING TEST, 1965-66

POULTRY RESEARCH STATION, WEMBLEY

FINAL REPORT TO 500 DAYS


Tenth Random Sample Laying Test, 1966-67 : Cages, Department Of Agriculture, Western Australia Jan 1967

Tenth Random Sample Laying Test, 1966-67 : Cages, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

TENTH RANDOM SAMPLE LAYING TEST, 1966-67 - CAGES

POULTRY RESEARCH STATION, WEMBLEY

SECOND PROGRESSIVE REPORT TO 26th FEBRUARY, 1967

Average age of birds 215.5 days or 30 weeks and 6 days.


Special Field Days For Merino Breeders, Department Of Agriculture, Western Australia Jan 1967

Special Field Days For Merino Breeders, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

More than 200 Merino stud breeders attended special stud breeding and fertility field days arranged for them by the Department of Agriculture recently.

Breeders attending represented some 40 per cent of the State's Merino studs.