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Articles 3571 - 3600 of 3640
Full-Text Articles in Entire DC Network
The Relation Of Spring Bird Distribution To A Vegetation Mosaic In Southeastern Washington, Paul A. Johnsgard, W. H. Rickard
The Relation Of Spring Bird Distribution To A Vegetation Mosaic In Southeastern Washington, Paul A. Johnsgard, W. H. Rickard
Paul Johnsgard Collection
Climax vegetation is of particular interest for study since it is the oldest and most stable vegetation of a region and should be expected to have a distinctive complement of animals. The purpose of this investigation was to observe the predilection of birds for stands representing climax plant associations in a remnant of native grassland in southeastern Washington.
The grasslands of this region were rapidly converted from grazing use to wheat production beginning about 65 years ago (Daubenmire 1942) and as a result only a few scattered remnants of native vegetation remain today. Associated with changes in vegetation there have …
Studies On The Trematode Larva Neascus, Thomas Reyes
Studies On The Trematode Larva Neascus, Thomas Reyes
University of the Pacific Theses and Dissertations
During the spring semesters of 1955 and 1956, while the writer was under the supervision of Dr. A. E. Noble, a preliminary survey was initiated on parasites in local fishes, amphibians, and reptiles occurring in the vicinity of Stockton, California. The collection of specimens in this survey included sixteen green sunfish, Lepomis cyanella, and two bluegills, L. macrochirus. Larval trematodes recovered from the heart and liver of these specimens belonged to the family Diplostomatidae Poirier (1886) which is characterized by a conspicuous constriction separating the fore and hind-bodies. The leaf-like forebody with the lateral borders converging ventrally to form a …
Effects Of Water Fluctuation And Vegetation Change On Bird Populations, Particularly Waterfowl, Paul A. Johnsgard
Effects Of Water Fluctuation And Vegetation Change On Bird Populations, Particularly Waterfowl, Paul A. Johnsgard
Paul Johnsgard Collection
In recent years reclamation activities in the Columbia Basin of Washington have resulted in profound changes in the character of the entire landscape throughout this region. The present study is an attempt to clarify some of the biological effects of impoundment behind O'Sullivan Dam in the Potholes area, Grant County (Johnsgard 1955b). In this area, a large expanse of moving sand dunes and a high water table are responsible for causing the formation of numerous small water areas, or "potholes," between the dunes. The physical nature of the area and its limited potentialities have made it of little value to …
Bulletin No. 9: Six Points Of Especial Botanical Interest In Connecticut, Richard H. Goodwin, Frank E. Egler, William A. Niering, Charles E. Olmsted, David M. Smith, Henry W. Hicock, Herbert I. Winer, Edward C. Childs
Bulletin No. 9: Six Points Of Especial Botanical Interest In Connecticut, Richard H. Goodwin, Frank E. Egler, William A. Niering, Charles E. Olmsted, David M. Smith, Henry W. Hicock, Herbert I. Winer, Edward C. Childs
Bulletins
The areas described are the Barn Island Marshes, the Connecticut Arboretum, the North Haven Sand Plains, Catlin Wood, Cathedral Pines and the Bigelow Pond Hemlocks. 32 pp.
Waterfowl Sex Ratios During Spring In Washington State And Their Interpretation, Paul A. Johnsgard, Irven O. Buss
Waterfowl Sex Ratios During Spring In Washington State And Their Interpretation, Paul A. Johnsgard, Irven O. Buss
Papers in Ornithology
Sex-ratio studies have received much attention from research workers in recent years. The contributions of Hochbaum (1944), Petrides (1944) and others have yielded considerable information on sex ratios in waterfowl; Beer (1945) and Yocom (1949) have presented data for the state of Washington. To interpret regional data on waterfowl sex ratios adequately, it is necessary to obtain a series of uninterrupted observations covering the entire migration period of the species concerned. In 1954, an ecologic study was conducted in the Potholes area, Grant County, central Washington (Johnsgard, 1956). During the period February 15 to May 16, sex-ratio data were collected …
A Taxonomic And Ecological Study Of The Ants On The Campus Of The University Of New Mexico, Tad S. Clements
A Taxonomic And Ecological Study Of The Ants On The Campus Of The University Of New Mexico, Tad S. Clements
Biology ETDs
This thesis attempts to indicate some of the ways in which the ants of the campus of the University of New Mexico affect man within the small area of the campus. However, my purpose of doing the study has not been strictly limited by practical considerations. Until now, no systematic study has been made of the Formicidae of the University of New Mexico Campus. Since the habitats produced artificially by man on the University of New Mexico Campus have resulted in favoring certain species of ants not found by the writer elsewhere in the region, the present study is valuable.
Fall Distribution Of Birds In A Palouse River Canyon, Frank B. Golley, Paul A. Johnsgard
Fall Distribution Of Birds In A Palouse River Canyon, Frank B. Golley, Paul A. Johnsgard
Paul Johnsgard Collection
During the fall and winter of 1953 the writers undertook a general ecological study of a portion of the Palouse River valley, near Armstrong, Whitman County, Washington. During the course of these investigations records were kept on the numbers of birds observed and the vegetation in which they were located. It was anticipated that these observations might indicate bird-use of the major vegetational types found in the area. Several investigators (Dumas 1950; Wing 1949) have published distributional data for birds of the Palouse grassland during the nesting, period, but few have been concerned with distribution patterns during the fall migration.
Mammals Of The Lynndyl, Utah, Sand Dune Area : A Population Problem, Hugh J. Phillips
Mammals Of The Lynndyl, Utah, Sand Dune Area : A Population Problem, Hugh J. Phillips
Theses and Dissertations
The purpose of this study was to determine the kinds, population, distribution, and general habits of the mammals of the Lynndyl sand dune area. Only one article concerning the dunes was found, but several have been written on other dunes; however, none was found concerning mammals. Two quantitative studies, plot and transect trappings, were made and general observations were taken within the study area. Three types of plots; Russian thistle, juniper, and baren moving dunes; were trapped and revealed the following species: Dipodomys ordii, Peromyscus maniculatus, Reithrodontomys megalotis, Onychomys leucogaster, and Neotoma lepida. The most numerous animal in all plots …
38th Annual Meeting, 1954. Program, Academy Editors
38th Annual Meeting, 1954. Program, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
38th Annual Meeting, 1954. Abstracts Of Papers, Academy Editors
38th Annual Meeting, 1954. Abstracts Of Papers, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Courtship Activities Of The Anatidae In Eastern Washington, Paul A. Johnsgard
Courtship Activities Of The Anatidae In Eastern Washington, Paul A. Johnsgard
Papers in Ornithology
The many interesting and sometimes spectacular aspects of waterfowl courtship have been observed and recorded by several writers. Among the best and most complete descriptions are those of Bent (1923, 1925), Townsend (1910, 1916), Wetmore (1920), and Hochbaum (1944). However, for the most part these are unillustrated, deal with only a few species, or are based on limited observations.
The Parasite Of Necturus, Joseph P. Harris Jr.
The Parasite Of Necturus, Joseph P. Harris Jr.
Field and Laboratory
In all, some fifteen species of animals parasitic upon Necturus have been reported. It is probable that none is exclusively a parasite of Necturus, for nearly all have also been reported from other animals.
North American Prairie, J. E. Weaver
North American Prairie, J. E. Weaver
Papers of John E. Weaver (1884–1956)
TO MOST AMERICANS, the word "Prairie" suggests either a romantic element in pioneer fiction or a vast expanse of level land which must be crossed in going from one coast to another. But to the botanist, the American Prairie is a wonderfully complex society of living organisms.
This book tells the story of that society-the variety of its inhabitants; the constitution of its several communities; the internal struggles for domination of the society; and the battles of the Prairie as a whole against its two most vicious enemies, drought and overgrazing. Most striking, perhaps, is the story of that portion …
Birds Observed In The Potholes Region During 1953-1954, Paul A. Johnsgard
Birds Observed In The Potholes Region During 1953-1954, Paul A. Johnsgard
Papers in Ornithology
From June 15-August 15, 1953 and from February 15 to August 15, 19 5 4 the writer did extensive field work in the Potholes Region of Grant County,Washington, gathering data for an ecological study of the vegetation and wildlife of that area. During this time considerable observations of the bird life were made, which for the most part were restricted to the area adjacent to O'Sullivan Dam and Potholes Reservoir.
Ecological Observations Upon The Fresh-Water Sponges In Dallas County, Texas, E. P. Cheatum, Joseph P. Harris Jr.
Ecological Observations Upon The Fresh-Water Sponges In Dallas County, Texas, E. P. Cheatum, Joseph P. Harris Jr.
Field and Laboratory
Published distributional and ecological data on the fresh-water sponges of Texas are meager. Besides Marcus Old's (1936) report on sponges collected by us the only other published report for this region is a description of Asteromyenia plumosa by Weltner (1895) from McKinney, Collin County, Texas. Dr. Old reported Spongilla fragilis from a small pond 1½ miles west of Dallas, and from Parson's Slough near Seagoville in Dallas County; Trochospongilla horrida from Elm Fork of the Trinity River, Dallas County; Asteromyenia plumosa from White Rock Lake, Dallas; and Ephydatia crateriformis from the East Fork of the Trinity River in Rockwall County. …
Notes Of The Ecology Of The Fresh-Water Mussels Of Dallas County, Louis B. Read, Kelly H. Oliver
Notes Of The Ecology Of The Fresh-Water Mussels Of Dallas County, Louis B. Read, Kelly H. Oliver
Field and Laboratory
The late John K. Strecker of the Baylor University Museum catalogued the Naiades of Texas in 1931. Since then, but little has been added to our knowledge of these mollusks in Texas. We need now, especially, studies on the general ecology of Texan species, with a modern revision of names, careful comparison of the synonymy, and close identification of Texas specimens in the museums. Last summer (1951) we made an ecological study of Parson's Slough in the southeastern part of Dallas County. In our work we gathered much information on the bivalve mollusks. Other data later gathered from this locality …
Effects Of Excessive Natural Mulch On Development, Yield, And Structure Of Native Grassland, J. E. Weaver, N. W. Rowland
Effects Of Excessive Natural Mulch On Development, Yield, And Structure Of Native Grassland, J. E. Weaver, N. W. Rowland
Department of Agronomy and Horticulture: Faculty Publications
Prairie vegetation is so universally mowed, grazed, or burned that little information has been recorded on its behavior under complete protection. Climax grassland, when grazed lightly or even moderately, may retain essentially its natural composition over extremely long periods (16, 18). But aside from observation there is little information upon the unusual and rare phenomenon of complete protection of grassland from disturbance over a considerable period of time.
Helminths From The Round-Tailed Muskrat, Neofiber Alleni Nigrescens Howell, With Descriptions Of Two New Species, Robert L. Rausch
Helminths From The Round-Tailed Muskrat, Neofiber Alleni Nigrescens Howell, With Descriptions Of Two New Species, Robert L. Rausch
Harold W. Manter Laboratory of Parasitology: Faculty Publications
Two specimens of round-tailed muskrat, Neofiber alleni nigrescens Howell, were examined for helminth parasites. Four species, a trematode and three cestodes, were collected. Two of these, Quinqueserialis floridensis and Paranoplocephala neofibrinus, are described as new. Cittotaenia praecoquis Stiles, 1895, is recorded from this host, and larval cestodes are tentatively identified as Taenia lyncis Skinker, 1935.
Whole Issue Nebraska Bird Review (Jan 1952) 20(1)
Whole Issue Nebraska Bird Review (Jan 1952) 20(1)
Nebraska Bird Review
Table of Contents
Fall Field Day, 1951.............................................................. 3
Editorial ................................................................................ 9
Notes on the Food Habits of the Great Horned Owl, by J. Knox Jones, Jr. 10
James Chamberlain Crawford, by Alexander Wetmore .................................... 11
Fred M. Dille Collection ................................................................................................ 12
Twenty-five Year Summary of Bird Migration in Nebraska, Part 6, by William F. Rapp, Jr ..................................................................... 13
News and Notes .............................................................. 19
Five Year Summary of Christmas Bird Counts, by Janet L. C. Rapp and William F. Rapp, Jr ................................................................................. 15
General Notes ................................................................. 19
Book Reviews ................................................................. .23
Membership List .................................................... .26
An Ecological Study Of Cladophora Glomerate (Chlorophyceae) Near Dallas, Martha Hasty Thurman, Robert A. Kuehne
An Ecological Study Of Cladophora Glomerate (Chlorophyceae) Near Dallas, Martha Hasty Thurman, Robert A. Kuehne
Field and Laboratory
Cladophora glomerata, a green alga of the order Ulotrichales, family Cladophoraceae, is characterized by dich tomous branching, with ramuli ending in dense terminal fascicles…. Between October, 1949 and July, 1950, we collected this species in the Dallas area from Elm Fork of the Trinity River, and Bachman's, White Rock, and Ten Mile creeks.
Addenda On Texas Chamaesyce (Euphorbiaceae), Lloyd H. Shinners
Addenda On Texas Chamaesyce (Euphorbiaceae), Lloyd H. Shinners
Field and Laboratory
No abstract provided.
Physiographic Influences Of The Edwards Plateau On Its Endemic Amphibian Fauna-A Résumé, Lawrence Curtis
Physiographic Influences Of The Edwards Plateau On Its Endemic Amphibian Fauna-A Résumé, Lawrence Curtis
Field and Laboratory
It has long been known that the geographic ranges of certain plants and animals not only closely parallel each other, but also the physiography of their habitat. Indeed, plants and animals seem often to follow clearly certain intangible lines, in their distribution.
Ecology Of Passerine Birds Wintering At Utah Lake, Joseph R. Murphy
Ecology Of Passerine Birds Wintering At Utah Lake, Joseph R. Murphy
Theses and Dissertations
During the period of October to April of the winter of 1950-51, an ecological study was undertaken of a population or passerine birds wintering in a segment of the Utah Lake Shore. Available winter weather data indicated that although such factors as precipitation, temperature, and wind may often be severe, they are not critical enough to prevent a fairly large population of passerine birds from spending the winter months in the study locale. Five fairly distinct plant communities can be recognized in the area. There is evidence which indicates that certain passerine bird species are especially dependent on a particular …
An Ecological Study Of A Sphagnum Lake In The Subalpine Forest Of The Uinta Mountains Of Utah, Howard C. Stutz
An Ecological Study Of A Sphagnum Lake In The Subalpine Forest Of The Uinta Mountains Of Utah, Howard C. Stutz
Theses and Dissertations
A study was made of the ecology and floristics of a small bog lake referred to as Moss Lake, in the Grandaddy lakes region of the Uinta Mountains , Utah . Three consecutive summers, 1948, 1949, and 1950, were spent in collecting the data presented in this study. Throughout the study the following ecological measurements were made: 1. Water 2. Soil 3. Macroscopic vegetation 4. Plankton 5. Macroscopic animal forms.
A Preliminary Study Of The Distribution Of Fleas In Utah Known To Be Capable And Potential Vectors Of Plague, Dorald M. Allred
A Preliminary Study Of The Distribution Of Fleas In Utah Known To Be Capable And Potential Vectors Of Plague, Dorald M. Allred
Theses and Dissertations
Plague outbreaks in the past have been disastrous where domestic rats and their fleas of certain species were common. Plague has been known to occur in most parts of the world (Robertson 1923), and has occurred as human epidemics for many centuries (Dubos 1948).
Alpine Plant Succession Near Mount Emmons, Uinta Mountains, Utah, Joseph R. Murdock
Alpine Plant Succession Near Mount Emmons, Uinta Mountains, Utah, Joseph R. Murdock
Theses and Dissertations
It was to provide some detailed information about the alpine flora , particularly as it relates to successional aspects , that the present study was undertaken . The environmental conditions of weather and soil , as they effect floral composition , are important factors in the plant succession or alpine communities . The investigation was designed to uncover such information about the alpine flora and environment necessary to establish the pattern of succession .
An Ecological Study Of The Utah Sculpin Cottus Bairdi Semiscaber In Logan River, Utah, William Merle Zarbock
An Ecological Study Of The Utah Sculpin Cottus Bairdi Semiscaber In Logan River, Utah, William Merle Zarbock
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The study of the Utah sculpin Cottus bairdi semiscaber, or Rocky Mountain bullhead as it is known locally on Logan River, Utah, is primarily one of determining its relation to game fish. Field work for this study began in 1949 and continued to March of 1951. Numbers of the Utah sculpin on Logan River have been estimated to be as high as 150 per tenth mile of stream. The larger populations are in the area of the third impoundment on Logan River and downstream.
Ecological Studies In A Midwestern Range: The Vegetation And Effects Of Cattle On Its Composition And Distribution, J. E. Weaver, G. W. Tomanek
Ecological Studies In A Midwestern Range: The Vegetation And Effects Of Cattle On Its Composition And Distribution, J. E. Weaver, G. W. Tomanek
Department of Agronomy and Horticulture: Faculty Publications
There is continued need for a better understanding of range vegetation and its use by range animals. Range preservation and improvement in the midwest are largely matters of wise use and proper management of our natural grasslands. A more comprehensive understanding of the range itself is needed--its forage, soil, and water supply, and factors influencing a proper distribution of livestock. The degree of utilization of forage that will result in the maintenance of excellent or good range condition and the improvement of a range in fair condition should be ascertained. Soil conservation on range lands is accomplished primarily by improvement …
Enemies Of Aspen, Clyde M. Christensen, Ralph L. Anderson, A. C. Hodson, Paul O. Rudolf
Enemies Of Aspen, Clyde M. Christensen, Ralph L. Anderson, A. C. Hodson, Paul O. Rudolf
Aspen Bibliography
So long as aspen was considered primarily a weed species, there was little concern over the enemies which might injure or destroy it. Sometimes these enemies were actually considered "blessings in disguise. Now, however, that aspen not only is the most abundant "but also one of the most widely utilized tree species in the Lake States, there is increasing interest in anything that may affect its future supply. For that reason this brief summary of information on the enemies of aspen has been assembled.
Biotic Interrelationships Of Helminth Parasitism, Robert L. Rausch
Biotic Interrelationships Of Helminth Parasitism, Robert L. Rausch
Harold W. Manter Laboratory of Parasitology: Faculty Publications
Biotic interrelationships in Alaska have so far suffered little from man's attempts to improve upon nature. As a result of these favorable circumstances, biological investigation in Alaska offers unusual opportunity for elucidating problems which can no longer be approached in the more populated parts of North America. One is very fortunate to have the opportunity of working under these conditions, since present trends indicate that Alaska is soon to go by the way of the great wildernesses which once existed in the United States and Canada.