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Articles 1 - 23 of 23
Full-Text Articles in Ornithology
Nest Success By A Female Black-Chinned Hummingbird (Archilochus Alexandri) With Male-Like Plumage, Cooper M. Farr, John Middleton
Nest Success By A Female Black-Chinned Hummingbird (Archilochus Alexandri) With Male-Like Plumage, Cooper M. Farr, John Middleton
Western North American Naturalist
Female-limited polymorphism, a phenomenon in which female animals can exhibit male-like coloration, is known to occur in approximately 25% of hummingbird species, but it has not previously been recognized in Black-chinned Hummingbirds (Archilochus alexandri). Between May and July 2021, we documented a Black-chinned Hummingbird with male plumage features that built a nest, incubated eggs, and successfully fledged 2 chicks in Salt Lake City, Utah. The bird’s gorget feathers, including the chin and upper throat, were predominantly dark with a small number of white feathers interspersed. Because the bird participated in nest building, presumed egg production, and incubation—behaviors not …
Unusual Bird Reports From The Trans-Pecos District Of Chihuahua, Mexico, Including Five New Additions To The State Of Chihuahua, Israel Moreno-Contreras, Fernando Mondaca-Fernández, Daniel Enrique Pérez-Carrillo, José Manuel Jurado-Ruiz, María Cristina Pérez-Amezola, Marisa Tirado-Madrid, William H. Howe
Unusual Bird Reports From The Trans-Pecos District Of Chihuahua, Mexico, Including Five New Additions To The State Of Chihuahua, Israel Moreno-Contreras, Fernando Mondaca-Fernández, Daniel Enrique Pérez-Carrillo, José Manuel Jurado-Ruiz, María Cristina Pérez-Amezola, Marisa Tirado-Madrid, William H. Howe
Western North American Naturalist
We present new distributional information on 21 species of birds from the state of Chihuahua, Mexico, 5 of which represent the first documented records for this state. Several observations are of birds normally associated with the Sierra Madre Occidental province, suggesting that these species may be regular wanderers to the Trans-Pecos district of Chihuahua.
Presentamos nueva información sobre 21 especies de aves del estado de Chihuahua, México. Cinco de ellas representan el primer registro documentado para Chihuahua. Nuestras observaciones adicionales son de aves asociadas con la provincia de la Sierra Madre Occidental, sin embargo, estos registros sugieren que estas especies …
Territorial Intrusion By Resident Male Wilson's Warblers: Breeding Stages Of The Intruders And Distances They Travel, William M. Gilbert
Territorial Intrusion By Resident Male Wilson's Warblers: Breeding Stages Of The Intruders And Distances They Travel, William M. Gilbert
Western North American Naturalist
It now is generally recognized that genetic monogamy is the exception in birds, and that extrapair paternity in territorial species requires that one or the other sex involved in such an extrapair mating travel off its own territory to obtain an extrapair copulation. However, which sex or sexes travel off their home territories, the distances they might travel to obtain extrapair copulations, and the breeding stages during which they might make such off-territory forays are poorly understood for most species. I explored these issues in Wilson’s Warblers (Cardellina pusilla) in central, inner-coastal California. Male Wilson’s Warblers frequently intruded …
Two New Late Quaternary Avifaunas From The East-Central Great Basin With The Description Of A New Species Of Falco, Steven D. Emslie, Jim I. Mead
Two New Late Quaternary Avifaunas From The East-Central Great Basin With The Description Of A New Species Of Falco, Steven D. Emslie, Jim I. Mead
Western North American Naturalist
We report 2 new late Quaternary avifaunas from cave deposits in Snake Valley, White Pine County, eastern Nevada, that provide new records of extinct and extant species in the east-central Great Basin. These avifaunas collectively represent at least 24 species, including the most northern inland record of California Condor (Gymnogyps californianus) in western North America and a new species of kestrel (Falco sp.) described herein. Two extralimital living species also were identified—the Harlequin Duck (Histrionicus histrionicus) and Snowy Owl (Bubo scandiacus)—and are the first fossil records of these species in the Great Basin. …
Aspects Of Bald Eagle Winter Behavior In Rush Valley Utah: A Telemetry Study, Neil B. Sabine
Aspects Of Bald Eagle Winter Behavior In Rush Valley Utah: A Telemetry Study, Neil B. Sabine
Theses and Dissertations
The diurnal behavior and nocturnal roosting patterns of 28 bald eagles outfitted with tail-mounted radios were investigated in Rush Valley, Utah between January and March 1982-1984. Casting analysis and feeding observations indicated the principal food source was jackrabbit carrion. Jackrabbit availability declined from 1982 to 1984 and eagles responded by; 1) roosting closer to feeding sites, 2) shifting from canyon to valley roosts, 3) arriving later at and departing earlier from roosts, 4) decreasing diurnal activity, and 5) decreasing residence time. Foraging efficiency appeared to be maximized by experienced eagles using familiar feeding areas and by naive birds monitoring their …
Utilization Of Nest Boxes By Birds In Three Vegetational Communities With Special Reference To The American Kestrel (Falco Sparverius), Laurence Barrett Mcarthur
Utilization Of Nest Boxes By Birds In Three Vegetational Communities With Special Reference To The American Kestrel (Falco Sparverius), Laurence Barrett Mcarthur
Theses and Dissertations
This study was designed to determine if, by providing artificial nest sites, a raptorial predator could be attracted into an area where suitable sites are limited. The American Kestrel (Falco sparverius) was a common species in the area and nest boxes designed for their use were placed in three vegetational types in western Utah and eastern Nevada. Seventy boxes were available in 1975 and 110 in 1976. Kestrels nested both years in the salt-desert shrub community but were absent from the pinyon-juniper and riparian areas. Four other bird species nested in the latter two areas, however. In 1975 the nesting …
The Snowy Egret (Egretta Thula Brewsteri) A Life History Study At Utah Lake With Comments On The Subspecies Status, Gerald Leigh Gunnell
The Snowy Egret (Egretta Thula Brewsteri) A Life History Study At Utah Lake With Comments On The Subspecies Status, Gerald Leigh Gunnell
Theses and Dissertations
This study was conducted to augment the limited information available regarding the Snowy Egret in the Utah Lake area of Utah. Field observations included the following: nesting habits; egg and clutch sizes; sexual, defense, and feeding behaviors. Analysis was made of the distinguishing subspecies characteristics (culmen, tarsus, and wing length) of the Snowy Egrets and of the distribution of the birds. Field observations showed that growth measurements of the young varied from 16.75 g at hatching to 260.58 g after 17 days. Culmen and tarsus measurements were 15.41 mm and 14.12 mm to 53.18 mm and 62.18 mm, respectively, after …
Habitat Partitioning In A Community Of Passerine Birds, Robert C. Whitmore
Habitat Partitioning In A Community Of Passerine Birds, Robert C. Whitmore
Theses and Dissertations
Habitat partitioning was studied in a community of passerine birds in the Virgin River Valley of southwestern Utah. Ten habitat structure variables were measured for each of 24 species of passerine birds and several multivariate statistical techniques were used to determine the extent of habitat partitioning. Ordinations of species distributions along known environmental gradients were constructed using Principal Component Analysis and Stepwise Discriminant Analysis. Stepwise Discriminant Analysis was also used to determine which habitat variables were important in species separation. It was found that percent canopy cover was the most important variable. Two hundred seventy six pairs of species were …
Raptor Temperature Regulation And Energetics, James Arthur Mosher
Raptor Temperature Regulation And Energetics, James Arthur Mosher
Theses and Dissertations
A review of energetics studies of raptorial species introduces four separate studies of temperature regulation by raptors. Golden Eagle (Aquila chrysaetos) nest site selection, as influenced by direction of exposure, is discussed. The data show strong directional preferences to the NNW by southern populations and SSE by northern populations. The tarsometatarsus is shown to have a thermoregulatory function in large falcons, and adaptations of this mechanism to varied habitats are examined. Color phase in Screech Owls (Otus asio) is shown to be related to metabolic differences that may explain the distributions of the color morphs. Development of thermoregulation in Flammulated …
Ecology Of The Ferruginous Hawk (Buteo Regalis) In Central Utah Population Dynamics And Nest Site Selection, Neil D. Woffinden
Ecology Of The Ferruginous Hawk (Buteo Regalis) In Central Utah Population Dynamics And Nest Site Selection, Neil D. Woffinden
Theses and Dissertations
Research was conducted to determine the effect of prey numbers on the nesting success of the Ferruginous Hawk (Buteo regalis). Conditions associated with nest site selection were also established. Frequent visits were made to active nests to determine clutch sizes, hatching dates and fledging success. Prey remains were collected from nests and analyzed. Kilometer square transects were made throughout the study area in 1974 to determine jackrabbit densities. A drastic decline in numbers of Ferruginous Hawks occurred. The number of young fledged also declined throughout the study while nestling mortality increased. Jackrabbit numbers were high in 1972 and then declined …
Biology Of Northern Bald Eagles (Haliaeetus Leucocephalus Alascanus) On Amchitka Island, Alaska, Steven K. Sherrod
Biology Of Northern Bald Eagles (Haliaeetus Leucocephalus Alascanus) On Amchitka Island, Alaska, Steven K. Sherrod
Theses and Dissertations
Bald Eagles on Amchitka Island, Alaska, were studied from 1969-1972. From 1970-1972 the population averaged 214.6 eagles. The average ration was 66% adults to 34% subadults. The eagles move to and from the island in relation to significant food sources (especially the garbage dump). An increase in active nests occurred from 1969-1972 due to an increase in food. The average percentage of nests containing young from 1970-1972 was 71.28%. During these three years, the average number of young known in a nest per nesting attempt was 1.24, and the average number of young known in a nest per nest containing …
Nesting Ecology Of The Double-Crested Cormorant (Phalacrocorax Auritus Auritus) On Utah Lake, Ronald M. Mitchell
Nesting Ecology Of The Double-Crested Cormorant (Phalacrocorax Auritus Auritus) On Utah Lake, Ronald M. Mitchell
Theses and Dissertations
Research on the nesting of the Double-crested Cormorant (Phalacrocorax auritus auritus) was undertaken to determine the nesting ecology of the bird on Utah Lake, Utah County, and the possible effects that diking Provo Bay would have on the cormorants breeding there. In 1973, two colonies in Provo Bay were visited weekly to determine laying dates, incubation period, clutch size, and hatching dates. Another colony, located on the dike of the Geneva Steel Reservoir, was visited daily during the spring and summer of 1973. At this colony, egg-laying occurred from 13 April to 17 May. The average clutch size was 3.8, …
Habitat And Time Utilization Of A Pair Of Nesting Sharp-Shinned Hawks (Accipiter Striatus Velox) : A Telemetry Study, Joseph Belnap Platt
Habitat And Time Utilization Of A Pair Of Nesting Sharp-Shinned Hawks (Accipiter Striatus Velox) : A Telemetry Study, Joseph Belnap Platt
Theses and Dissertations
Telemetric observations were conducted on a pair of Sharp-Shinned Hawks (Accipiter striatus velox) nesting in Spanish Fork Canyon, Utah in 1972. The movements of both adults were monitored from the time their eggs hatched in late June until they left the study area in early August, fourty-two days later. A transmitter was also attached to one of the young at the time of fledging. The adult's main hunting area was a single plant community located 1600 meters from the nest. The male performed the majority of the foraging while the female spent the greatest part of her time at the …
Nesting Of The White-Faced Ibis (Plegadis Chihi) Of Utah Lake, Kenichi David Kaneko
Nesting Of The White-Faced Ibis (Plegadis Chihi) Of Utah Lake, Kenichi David Kaneko
Theses and Dissertations
Information on the nesting of the White-faced Ibis (Plegadis chihi) in Utah County is presented for the first time. Nests built in hardstem bulrush (Sciprus acutus) settled from an average height of 120.8cm on June 9 to 93.6cm on June 27, 1971. Nest spacing ranged from 2m to 9m, averaging 4.6m. Invertebrates of the class Arachnida and the insect orders Coleoptera, Homoptera, Lepidoptera, and Thysanoptera were collected in a Berlese funnel. Average clutch size was 3.17. Egg length and width averaged 51.40mm X 36.75mm. Average volume was 36.93cc. In 21 study nests, 45.8 percent of the eggs hatched, beginning on …
Population Dynamics, Habitat Selection, And Partitioning Of Breeding Raptors In The Eastern Great Basin Of Utah, Dwight Glenn Smith
Population Dynamics, Habitat Selection, And Partitioning Of Breeding Raptors In The Eastern Great Basin Of Utah, Dwight Glenn Smith
Theses and Dissertations
A comparative study of the breeding ecology of 12 raptor species was conducted in the eastern Great Basin from 1967-1970. The project was designed to determine the composition and densities, habitat selection, territoriality and predatory habits of raptorial birds in a semi-arid environment. All topics were analyzed comparatively, relating the requirements and activities of the 12 raptor species. Average yearly population densities of all species approximated 0.5 pairs per square mile. Predominant raptors were the Ferruginous Hawk and Great Horned Owl. The productivity of these and the other large raptors correlated closely with the abundance of their main food source, …
Nesting Ecology Of The Ferruginous Hawk (Buteo Regalis) In West-Central Utah, John Bradford Weston
Nesting Ecology Of The Ferruginous Hawk (Buteo Regalis) In West-Central Utah, John Bradford Weston
Theses and Dissertations
During the spring seasons of 1967 and 1968 ecological studies were made of nesting Ferruginou.s Hawks (Buteo regalis) in a 325 square mile area in west-central Utah. In the springs of 1967 and 1968 a systematic search was conducted throughout the study area for Ferruginous Hawk nests. When active nests were located they were kept under observation throughout the study. The density of nesting pairs in 1967 and 1968 ranged from 7 to 15.4 square miles per pair. An annual seasonal displacement was exhibited, with Ferruginous Hawks being present in the study area only during the nesting season, which lasted …
Nesting Ecology Of The Great Horned Owl Bubo Virginianus In Central Western Utah, Dwight Glenn Smith
Nesting Ecology Of The Great Horned Owl Bubo Virginianus In Central Western Utah, Dwight Glenn Smith
Theses and Dissertations
Information was collected on the nesting ecology of the Great Horned Owl, with particular emphasis placed on aspects of its population and distribution, territoriality and predation. The study was conducted for the two years, 1967 and 1968 in the Thorpe and Topliff hills of central western Utah. Nesting densities on the study area were .36 pairs per square mile in 1967 and .40 pairs per square mile in 1968. Nests averaged one mile apart and were distributed in the periphery of the hills, overlooking the desert valleys. Favorite nest sites were cliff niches, but abandoned quarries and junipers were also …
The Status Of The Common Crow Corvus Brachyrhynchos Brehm In The Great Basin, Gerald Low Richards
The Status Of The Common Crow Corvus Brachyrhynchos Brehm In The Great Basin, Gerald Low Richards
Theses and Dissertations
Due to a lack of taxonomic and distributional information concerning the Common Crow Corvus brachryhynchos Brehm inhabiting the Great Basin of North America, Johnston (1961) in one of the most recent revisions on crows, was unable to include this area in his work. Between 1965 and 1967, field trips were taken throughout the Great Basin to secure specims, and to determine to what extent the area was being utilized by crows. Ecological information such as habitat prference, nesting behavior, and interactions with other species was collected where possible. Forty-eight birds were collected from the Great Basin. From a comparison of …
The Incidence Of Nasal Mites In Over-Wintering Red-Wing Blackbirds In The Vicinity Of Utah Lake, Utah, George M. Talley
The Incidence Of Nasal Mites In Over-Wintering Red-Wing Blackbirds In The Vicinity Of Utah Lake, Utah, George M. Talley
Theses and Dissertations
This paper reports the incidence and associations of four species of mites, Paraneonyssus icteridius, Ptilonyssus n. sp. "A", Sternostoma n. sp. "A" , and Speleognathus sp., found in the nasal cavities of the common red-wing blackbird (Agelaius phoeniceus ssp.) and Brewer's blackbird (Euphagus cyanocephalus cyanocephalus Wagler) over-wintering in the vicinity of Provo, Utah County, Utah. Three species of mites are reported for the first time from these birds, and two of these three are undescribed species.
A Life History Study Of The Spurred Towhee Pipilo Erythropthalmus Montanus, Travis G. Haws
A Life History Study Of The Spurred Towhee Pipilo Erythropthalmus Montanus, Travis G. Haws
Theses and Dissertations
This paper deals with the life history and distribution of the Spurred Towhee (Pipilo erythropthalmus moutanus Swarth). Research was begun in April, 1955, and terminted in June, 1956. The preferred habitat of this bird is the mountain slopes, canyons. and streamsides covered with a shrubby type of vegetation, usually between 5,000 and 8,000 feet in elevation. Distribution of the Spurred Towhee is throughout the central Rocky Mountain region in the states of Wyoming, Utah, Colorado, Arizona, western half of New Mexico, and into northern Mexico. During the winter these birds are found concentrated in the lower valleys along the streams …
Birds Of The Brigham Young University Campus, Barid Baran Mukherjee
Birds Of The Brigham Young University Campus, Barid Baran Mukherjee
Theses and Dissertations
This paper deals with the seasonal distribution, relative abundance, and location of the different species of birds which visit or live on the Brigham Young University campus from late summer to early spring, with a brief account of their activities. The upper campus, where this investigation was carried on, covers an area of 201 acres and is situated on a bench at the foot of the Wasatch Mountains. The study was continued from July 13, 1955 to April 15, 1956. A total of 173 hours was devoted to census work and to studying the general ecology of the area. Four …
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 …
A Seasonal Study Of Food Of Some Birds Of The Wasatch Chaparral, Herbert H. Frost
A Seasonal Study Of Food Of Some Birds Of The Wasatch Chaparral, Herbert H. Frost
Theses and Dissertations
A seasonal change occurred in the type of food consumed by the birds studied. Plant food was more important in the winter than in the summer. Animal food, except in one species, was found to be more important during the summer months. The most important plant foods determined by frequency and listed in order of their abundance were: Helianthus annuus, Celtis sp., Quercus sp., Polygonum convolvulus, Amaranthus blitoides, Chenopodium album, and Amaranthus graecizans. The most important animal foods based on occurance in stomachs examined were: Coleoptera, Hymenoptera, Lepidoptera larvae, Orthoptera, Undetermined larvae, Diptera, Homoptera, Coleoptera larvae, Araneae, and Hemiptera. Seventeen …