Relevant bibliographies by topics / Owls

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Academic literature on the topic 'Owls'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 August 2024

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Journal articles on the topic "Owls"

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Rashid, Ghulam Mustafa, Mirza Habib Ali, Abida Butt, and Abdul Qadir. "A cross-sectional study on knowledge, attitude and practices related to owls in central Punjab, Pakistan." Ornis Hungarica 29, no. 1 (June 1, 2021): 66–81. http://dx.doi.org/10.2478/orhu-2021-0005.

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Abstract Owls are considered as dominant predators for control of rats and mice population in agricultural fields and presently their populations are continuously declining in Punjab, Pakistan. The present study was aimed to assess the knowledge and attitude of people of rural and urban areas about the declining trend of owls. During this survey, more than 1600 people were asked to collect information regarding the owl populations from six localities including Faisalabad, Sialkot, Jhang, Lahore and Bahawalnagar. Four parameters were the major part of the questionnaire: familiarity, misconceptions, awareness about owls and their acceptance as a biological controlling agent. The results revealed that about 95% of people were familiar with owls in the agro-ecosystem. Only 15.6% of people thought that owls should be eliminated; 23.0% were of the opinion that owl’s presence in a locality leads to ruination; 33.3% agreed that the owls presence was a sign of bad omen; 41.8% considered them as signs of foolishness; 47.0% believed that owl’s body parts were used for black magic purposes. In contrast, 50% of people acknowledged that owls are beneficial to humans; 60.3% knew that owls are the enemies of rodents, 67.7% agreed that they are suppressors of rats and mice and 63.8% agreed that artificial nest boxes can serve as their nests and roosts. It was encouraging to know that 74.8% showed their willingness to enhance the owl’s population on their farms, and 74.0% were willing to permit the installation of nest boxes in or near the villages. The study of attitudes of respondents towards owl will help to develop an effective conservation strategy and to boost owl’s population in croplands for biological control of rats and mice.
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Crozier, Michelle L., Mark E. Seamans, R. J. GutiÉRrez, Peter J. Loschl, Robert B. Horn, Stan G. Sovern, and Eric D. Forsman. "Does The Presence of Barred Owls Suppress the Calling Behavior of Spotted Owls?" Condor 108, no. 4 (November 1, 2006): 760–69. http://dx.doi.org/10.1093/condor/108.4.760.

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Abstract Abstract Barred Owls (Strix varia) have expanded their range throughout the ranges of Northern (Strix occidentalis caurina) and California Spotted Owls (S. o. occidentalis). Field observations have suggested that Barred Owls may be behaviorally dominant to Spotted Owls. Therefore, we conducted a test of behavioral dominance by assessing responsiveness of Spotted Owls to conspecific calls when they were in the simulated presence (i.e., imitation of Barred Owl vocalizations) of a Barred Owl. We hypothesized that Spotted Owls would be less likely to respond to conspecific calls in areas where Barred Owls were common. We used a binary 2 × 2 crossover experimental design to examine male Spotted Owl responses at 10 territories randomly selected within two study areas that differed in abundance of Barred Owls. We also conducted a quasi experiment at four study areas using response data from any Spotted Owl (male or female) detected following exposure to Barred Owl calls. We inferred from the crossover experiment that the simulated presence of a Barred Owl might negatively affect Spotted Owl responsiveness. Both subspecies of Spotted Owl responded less to Spotted Owl calls after exposure to Barred Owl calls, Northern Spotted Owls responded less frequently in areas having higher numbers of Barred Owls, and California Spotted Owls responded less frequently than Northern Spotted Owls overall.
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Martinez, David R. "FOOD HABITS AND TROPHIC ATTRIBUTES OF THE MAGELLANIC HORNED OWL (BUBO MAGELLANICUS) IN PATAGONIAN STEPPE, SOUTHERNMOST CHILE." Ornitología Neotropical 31, no. 1 (June 30, 2020): 47–51. http://dx.doi.org/10.58843/ornneo.v31i1.471.

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For most of southern South America, the food habits of Magellanic Horned owls (Bubo magellanicus) are well known. In Chile, several researchers have reported the owl’s diet in northern xerophytic environments, as well as subpolar forests; however, other than a short note on the owls’ summer diet in Punta Dungeness, no major studies have documented the food habits of Magellanic Horned owls in the Chilean Patagonian steppe. Based on 278 fresh pellets, we reported the food habits of owls inhabiting two sites located at > 52°S in the southernmost Patagonian steppe in continental Chile, and compared our findings with those reported for owls inhabiting eight localities from 39 to 52°S in the Argentinean Patagonian steppe. Our results indicate that in Patagonian steppe environments of both Argentina and Chile, the Magellanic Horned Owl is a generalist predator, which consumes whatever prey available, ranging in size from inver- tebrates to introduced juvenile lagomorphs. Because all five major vertebrate prey here reported (Abrothrix olivacea, Loxodontomys micropus, Microcavia australis, Reithrodon auritus, Lepus europaeus) are broadly distributed in the Argentinean Patagonian steppe and occur abundantly from 36°S southwards to the Strait of Magellan and Isla Grande de Tierra del Fuego, their generalized occurrence as prey does not allow for expression of latitudinal trends in species composition in the owl’s diet.
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OGADA, DARCY L., and PAUL MURIITHI KIBUTHU. "Conserving Mackinder's eagle owls in farmlands of Kenya: assessing the influence of pesticide use, tourism and local knowledge of owl habits in protecting a culturally loathed species." Environmental Conservation 35, no. 3 (September 2008): 252–60. http://dx.doi.org/10.1017/s0376892908005006.

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SUMMARYFarmlands can be good habitat for owls and owls can benefit farmers, but pesticide use can negatively affect owls and within many regions of Africa owls are loathed owing to beliefs that they bring misfortune or death. Since 1997, a small-scale owl tourism initiative that educates farmers about owls and benefits them financially has been operating in central Kenya. Pesticide use, farmers' beliefs and knowledge about owls, and the impacts that tourism can have on farmers' attitudes and behaviour towards owls in rural Kenya were surveyed. Agricultural pests were the most serious problem facing farmers, though only 28 % of farmers said they controlled vertebrate pests using pesticides. The insecticide carbofuran was often misused to kill vertebrate pests. Common control measures were either to ‘do nothing’ or to chase pests from farms. Farmers knew of Mackinder's eagle owls living adjacent to their farms, but 68 % said they didn't adhere to the culturally negative beliefs about owls. Knowledge of owl diet amongst farmers was high (75 %). Farmers who benefited from owl tourism were more likely to know more about owl diet and habits. Where farmers gained financial benefits from tourism or knew more about owls, they were more likely to categorize owls as ‘good’, but farmers who knew about owl diet were more likely to use pesticides or kill owl prey on their farms. Though knowledge of owls did not have a positive effect on farmers' behaviour toward owls, this was probably the result of a lack of ecological literacy rather than any deliberate antagonism toward owls. Financial rewards are very important to poor farmers, but may not result in actions that enhance species conservation unless farmers have a basic understanding of ecological processes.
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Kelly, Elizabeth G., Eric D. Forsman, and Robert G. Anthony. "Are Barred Owls Displacing Spotted Owls?" Condor 105, no. 1 (February 1, 2003): 45–53. http://dx.doi.org/10.1093/condor/105.1.45.

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Abstract Barred Owls (Strix varia) have expanded their range into the Pacific Northwest, and anecdotal evidence suggests that they may be displacing the federally threatened Northern Spotted Owl (Strix occidentalis caurina). Our objectives were to describe the current status of Barred Owls in Oregon and compare occupancy of Spotted Owls in historic Spotted Owl territories before and after Barred Owls were first detected in those territories. Between 1974 and 1998, we estimated that 706 different Barred Owl territories were located in Oregon. From 1989–1998 an average of 60 new Barred Owl territories were located in Oregon each year. In Spotted Owl demographic study areas in Oregon and Washington, Barred Owl detections increased at Spotted Owl territories from 1987–1999. Occupancy of Spotted Owl territories declined after Barred Owls were detected within 0.80 km of the territory center. When Barred Owls were detected 0.81–2.40 km from Spotted Owl territory centers, occupancy of Spotted Owls was only marginally less than at territories without Barred Owls. This suggests that the frequency and intensity of interactions between the two species is negatively associated with distance between them. Our results suggest that land managers and regulatory agencies should regard Barred Owls as a threat to Spotted Owls, particularly if Barred Owls continue to increase in number as they have during the past 25 years. ¿Está Strix varia Desplazando a Strix occidentalis caurina? Resumen. Desde su expansión hacia el Pacífico Noroeste, existe evidencia anecdótica de que Strix varia podría estar desplazando a S. occidentalis caurina. Nuestros objetivos fueron describir el estatus actual de S. varia en Oregon y comparar la ocurrencia de S. occidentalis caurina en sus territorios históricos antes y después de que S. varia se detectó por primera vez en dichos territorios. Entre 1974 y 1998, estimamos que se confirmaron 706 territorios diferentes de S. varia en Oregon. Entre 1989 y 1998, se localizaron en promedio 60 nuevos territorios de S. varia anualmente. En áreas con estudios demográficos de S. occidentalis caurina en Oregon y Washington, las detecciones de S. varia en territorios de S. occidentalis caurina se incrementaron entre 1987 y 1999. En comparación con territorios sin S. varia, la ocupación de territorios de S. occidentalis caurina disminuyó luego de que se detectaron individuos de S. varia a menos de 0.80 km del centro del territorio. Cuando se detectaron individuos de S. varia entre 0.81 y 2.40 km del centro de los territorios, la ocupación de éstos fue sólo marginalmente menor que en territorios sin S. varia. Esto sugiere que la frecuencia e intensidad de la interacción entre las dos especies está asociada con la distancia entre ellas. Nuestros resultados sugieren que las autoridades ambientales y de regulación deben considerar a S. varia como una amenaza para S. occidentalis caurina, particularmente si los números de S. varia se siguen incrementando como en los últimos 25 años.
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Hussain, Mubasher, and Jamil Akhtar. "Owls in Islam and Pakistan: Loopholes and Suggestions for Conservation and Management of this Highly Ecologically Important Niche." Journal of Bioresource Management 8, no. 1 (January 27, 2021): 40–45. http://dx.doi.org/10.35691/jbm.1202.0164.

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Due to their vital ecological significance, owls drew the attention of several groups working on wildlife protection and conservation management across the globe. Hence, certain legal provisions have been articulated in the wildlife protection acts of the advanced countries to ensure full legal protection of wildlife including owls. Although there are certain laws concerning the protection of wild life in Pakistan, the specific and consistent legal provisions are still required for owl’s full protection. This article highlights a dire need of the articulation of such provisions respecting the prohibition of owl hunting on several religious, legal and ecological grounds.
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Grossman, S. R., S. J. Hannon, and A. Sánchez-Azofeifa. "Responses of Great Horned Owls (Bubo virginianus), Barred Owls (Strix varia), and Northern Saw-whet Owls (Aegolius acadicus) to forest cover and configuration in an agricultural landscape in Alberta, Canada." Canadian Journal of Zoology 86, no. 10 (October 2008): 1165–72. http://dx.doi.org/10.1139/z08-095.

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Studies on the effects of forest fragmentation on birds have focussed primarily on passerines, with few studies on owls. We assessed the influence of forest amount and configuration on the abundance and distribution of three species of forest owls, Great Horned Owl ( Bubo virginianus (Gmelin, 1788)), Barred Owl ( Strix varia Barton, 1799), and Northern Saw-whet Owl ( Aegolius acadicus (Gmelin, 1788)), in agricultural landscapes with varying amounts of forest cover in central Alberta, Canada. All three species were positively associated with forest cover: Barred Owls were most prevalent in landscapes with >66% forest cover, Great Horned Owls in landscapes with between 36% and 65% forest cover, and Northern Saw-whet Owls in landscapes with between 16% and 100% forest cover. Regression models containing configuration variables were chosen as best models using AIC for all three species. Great Horned Owls were most abundant in landscapes with high heterogeneity: more forest–nonforest edges and higher forest patch area variation. Barred Owls were more likely to occur in landscapes with larger forest patch areas and Northern Saw-whet Owls were more abundant in landscapes that were more connected. These relationships are consistent with predictions based on body size of owls and local habitat relationships described in the literature.
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Hamer, Thomas E., Eric D. Forsman, and Elizabeth M. Glenn. "Home Range Attributes and Habitat Selection of Barred Owls and Spotted Owls in an Area of Sympatry." Condor 109, no. 4 (November 1, 2007): 750–68. http://dx.doi.org/10.1093/condor/109.4.750.

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Abstract We compared home range areas and habitat selection of radio-marked Spotted Owls (Strix occidentalis) and Barred Owls (Strix varia) in an area of sympatry in the northern Cascade Range of Washington in 1986–1989. On average, home ranges of Spotted Owls were 3–4 times larger than ranges of Barred Owls, and there was little overlap of home ranges during the breeding season. Ranges of both species tended to expand during winter. Home range size of both species was negatively correlated with the amount of old forest, but the negative slope of the regression was much steeper for Spotted Owls than for Barred Owls. For both species, home ranges of individual owls typically had high overlap among seasons and years, indicating high site fidelity. Barred Owls generally occupied home ranges at lower elevations than Spotted Owls (mean = 386 ± 27 m vs. 750 ± 68 m). Both species tended to use old forests more than expected, but Spotted Owls tended to use other cover types less than expected, whereas Barred Owls used most other cover types in proportion to their availability. We suggest that Spotted Owls may use larger ranges than Barred Owls because they prey selectively on a few species of nocturnal mammals, whereas Barred Owls forage more evenly across a broad range of prey types, including diurnal and aquatic species. The low overlap of Barred Owl and Spotted Owl home ranges suggests that territorial Barred Owls exclude Spotted Owls from their territories, at least during the breeding season, thus reducing the amount of habitat available to Spotted Owls.
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Cooke, Raylene, Rohan Bilney, and John White. "Potential competition between two top-order predators following a dramatic contraction in the diversity of their prey base." Animal Biology 61, no. 1 (2011): 29–47. http://dx.doi.org/10.1163/157075511x554400.

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AbstractTwo sympatric native top-order predators, the sooty owl (Tyto tenebricosa tenebricosa) and powerful owl (Ninox strenua) coexist throughout much of their range in south-eastern Australia. Following European settlement, however, major changes in resource availability for these predators potentially resulted in increased competition, especially for food. This study examined ecological attributes of both species, including intersexual differences in the sooty owl, potential resource partitioning and whether competition may be occurring. Dietary overlap was high between female sooty owls and powerful owls (0.90), compared to overlap between male sooty owls and powerful owls (0.67), with three mammalian species contributing over 74% of their diets. Sooty and powerful owls coexisted throughout the study region, regularly roosting within the same vegetation types, and in similar locations, although microhabitat differences were apparent. Sooty owls displayed aseasonal breeding, although a peak in fledging in spring coincided with powerful owl breeding. Both species exclusively nested in similar size mountain grey gums (Eucalyptus cypellocarpa), however, hollow characteristics differed slightly. Significant divergence along a single niche dimension was not detected between powerful and sooty owls, as they had similar diets, habitat usage and activity times, potentially resulting in competition. Reproductive output was low for both species, however, the degree to which competitive interactions influenced this remains unknown. To minimise potential competition, longterm feral predator control and improved habitat management is recommended to increase the density and diversity of small terrestrial mammals, as this should result in diversification of the sooty owl diet, reducing dietary overlap with powerful owls.
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Charter, Motti, Ido Izhaki, Kobi Meyrom, Shauli Aviel, Yossi Leshem, and Alexandre Roulin. "The Relationship between Weather and Reproduction of the Barn Owl Tyto Alba in a Semi-Arid Agricultural Landscape in Israel." Avian Biology Research 10, no. 4 (November 2017): 253–58. http://dx.doi.org/10.3184/175815617x15063340995365.

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Even though the Barn Owl ( Tyto alba) is distributed worldwide, little information is available on how weather affects Barn Owl breeding outside of Europe and North America. For instance, if cold temperatures can negatively influence population dynamics in temperate regions, heat could have a similar negative effect in arid regions. We have studied a breeding population of Barn Owls in a semi-arid agricultural environment over 13 years in Israel in order to determine whether lack of rain and hot ambient temperatures impair Barn Owl reproductive success. The percentage of nest boxes occupied by Barn Owls was not related to any of the weather variables, whereas the number of nestlings per Barn Owl pair and the percentage of pairs that succeeded to fledge young was lower in years when it started to rain later in the season and when the minimum daily temperature was higher during the breeding season. In comparison to temperate regions, heat is detrimental to Barn Owl breeding and early precipitation is probably important in boosting vegetation and, in turn, the abundance of small mammals, the Barn Owl's staple food.
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Dissertations / Theses on the topic "Owls"

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Lavazanian, Elizabeth, and elizabeth lavazanian@deakin edu au. "Diet and habitat of the powerful owl (Ninox strenua) living near Melbourne." Deakin University, 1996. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20071204.153147.

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The diet of Powerful Owls (Ninox strenua) living at Christmas Hills, 35km north-east of Melbourne was examined by analysis of 686 regurgitated pellets collected over two years. An aid was also developed to help identify potential mammalian prey species based on hair and skeletal characteristics. The following features were found to be most useful in distinguishing between the three species of arboreal marsupials - Common Ringtail Possum (Pseudocheirus peregrinus), Common Brushtail Possum (Trichosurus vulpecula) and Sugar Glider (Petaurus breviceps): - Cross-sectional width of primary guard hairs. - The size and shape of the nasal, frontal, parietal and squamosal bones of the skull. - Dentition. The size and shape of the upper incisor, canine and premolar teeth. The size and shape of the lower incisor and premolar teeth. - The size of the humerus. The Sugar Glider has a much smaller humerus than that of the Common Ringtail Possum and the Common Brushtail Possum. In the Common Brushtail Possum the entepicondyle ends in a very sharp point but the Common Ringtail Possum this point is not as sharp. - The Common Ringtail Possum’s femur has a very prominent trochanter which projects further than that in the Common Brushtail Possum. The femur of the Sugar Glider is distinguished by having a very large depression between the condyle and the trochanter. - The Common Brushtail Possum’s scapula has a narrower lower blade (relative to length) than that in the Common Ringtail Possum. The scapula of the Sugar Glider is smaller in size than that of the other two possums.The pelvic girdle Of the Common Brushtail Possum has a much wider ischium than those of the Common Brushtail Possum and the Sugar Glider. The ilium of the Sugar is much narrower and smaller than that of the other two possums Mammalian prey was found in 89%, insects in 13% and birds in 10% of the pellets. Of the mammals, Common Ringtail Possums occurred most frequently in the pellets over the year. There was no seasonal difference in the frequency of occurrence of Common Ringtail Possums and Sugar Gliders in pellets. However, Common Brushtail Possums were more likely to be taken in spring than in the other seasons. More adult Common Ringtail Possums were taken as prey than were other age classes over the year, except in summer when high numbers of young were consumed by the owls. The habitat of the Powerful Owl was examined by ground surveys and spotlight surveys in sixteen sites within the Warrandyte-Kinglake Nature Conservation Link. Four categories of survey sites were chosen with the following features. Category A - Sites with a dense understorey of shrubs and small trees, as well as many old trees (>10/ha) which might be suitable for nest hollows. Category B - Sites which lacked a dense understorey of shrubs and small trees and containing few or no old trees suitable for nest hollows. Category C - Sites with a dense understorey of shrubs and small trees but containing few or no old trees suitable for nest hollows. Category D - Sites which lacked a dense understorey of shrubs and small trees but having old trees (>10/ha) which might be suitable for nest hollows. High prey densities strongly correlated with the presence of hollows at these sites. In the light of the results, management recommendations were made for the future conservation of the Powerful Owls living at Christmas Hills. The following recommendations were particularly important: 1. Cleared or semi - cleared land within the Warrandyte Kinglake Nature Conservation Link be revegetated using indigenous species of eucalypts and waffles in order to provide a contiguous native forest corridor for the movement of possums and gliders between the Yarra River Valley and the Kinglake Plateau. 2. Continued planting of Eucalyptus spp. and Acacia spp. in the forested areas of the Warrandyte-Kinglake Nature Conservation Link. 3. Continued protection of healthy living trees to provide a continuous supply of hollow trees. 4. No falling of dead standing trees for firewood collecting as these can provide nest hollows for prey species of the Powerful Owl.
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Hardy, Paul Christopher 1969. "Habitat selection by elf owls and western screech-owls in the Sonoran Desert." Thesis, The University of Arizona, 1997. http://hdl.handle.net/10150/278633.

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Little is known about habitat selection by elf owls (Micrathene whitneyi) and western screech-owls (Otus kennicottii). From 1994 to 1996 in the Sonoran Desert, I used point counts and nest searches to examine habitat selection by both species at multiple spatial scales. The abundance of both species had a positive association with percent cover of washes and mesquite (Prosopis spp.) at the scale of the study area. At both the scale of the study area and the nesting area, elf owls selected areas with high densities of mature saguaros (Carnegiea gigantea) and saguaro cavities. Elf owls nested only in woodpecker cavities in saguaros, whereas western screech-owls nested in both saguaro cavities and in natural cavities in mesquite. Western screech-owls nested nearly exclusively in gilded flicker (Colaptes chrysoides) cavities when they nested in saguaros. Patterns of nest cavity selection by elf owls suggest they may choose cavities that provide thermoregulatory advantages. I give management recommendations based on my findings.
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Nickell, Kathleen R. "Spotted owls in harvested areas /." View online, 1986. http://repository.eiu.edu/theses/docs/32211998881023.pdf.

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Mills, Alexis Lee. "Not Seeing the Forest for the Owls: News Coverage of the Spotted Owl Controversy." Thesis, The University of Arizona, 1994. http://hdl.handle.net/10150/292244.

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Kavanagh, R. (Rodney). "Ecology and management of large forest owls in south-eastern Australia." Phd thesis, School of Biological Sciences, 1997. http://hdl.handle.net/2123/5009.

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Swarthout, Elliott Clifford Hunt. "Effects of backcountry recreation on Mexican spotted owls." Thesis, The University of Arizona, 1999. http://hdl.handle.net/10150/278707.

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On the Colorado Plateau, environments occupied by Mexican spotted owls (Strix occidentalis lucida) receive intense levels of recreational activity that could adversely effect their behavior and reproductive success. Any spatial restrictions on recreational activities in these narrow canyons would likely eliminate all recreational activity within a given canyon. We assessed changes to activity budgets and nest attendance caused by hikers (Chapter 1) and examined factors that influenced flush responses of roosting owls to hikers (Chapter 2). We conclude that high levels of recreational activity in nesting habitat may be detrimental to Mexican spotted owls and recommend a 205-m radius buffer zone around occupied nests. Based on responses of roosting owls to hikers, we established response thresholds as a basis for exploring management options that will maximize protection of owls and minimize restrictions to recreationists.
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Estabrook, Tracy Starr. "Burrow selection by burrowing owls in an urban environment." Thesis, The University of Arizona, 1999. http://hdl.handle.net/10150/278687.

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I surveyed parts of Tucson, Arizona to determine numbers of burrowing owl (Speotyto cunicularia) burrows present, identify characteristics associated with burrow sites, and assess reproductive success. I measured habitat characteristics at 48 winter, 58 breeding, and 48 random burrows. Random burrows were closer to perches (P) and farther from wash banks (P) than were active burrows, and had smaller entrance dimensions (P). Winter burrows were farther from human activity than were breeding burrows (P). Active sites had less total vegetation, and less visual obscurity than did random sites. Owls may have selected open sites to facilitate detection of predators or prey. Urbanization sometimes created conditions which appeared to attract owls, but also destroyed burrows. An average of 2.31 young fledged from 116 active burrows during 1997-1998. While comparable to other studies of burrowing owls occupying urban environments, this was lower than rates typically reported for the species.
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Cooke, Raylene, and mikewood@deakin edu au. "Ecology of powerful owls (Ninox strenua) in contrasting habitats of the Yarra Valley Corridor, Victoria, Australia." Deakin University. School og Ecology and Environment, 2000. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050825.133845.

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In this research I investigated ecological attributes of Powerful Owls (Ninox strenua) in a continuum of habitats throughout the Yarra Valley corridor of Victoria, Australia. These habitats ranged from a highly urbanized parkland (the Yarra Valley Metropolitan Park) to a relatively undisturbed closed forest (Toolangi State Forest). Different aspects of the owls' ecology were investigated at six sites to determine whether their behaviour changed when they occupied habitats with different levels of urbanization and disturbance. The ecological attributes investigated were habitat utilization and habitat requirements (for both roosting and nesting), adult behaviour (through radio-tracking), juvenile behaviour and dispersal (through radio tracking), diet (through analysing regurgitated food pellets) and breeding success rates. A number of methods were used to capture adult Powerful Owls. These are described and their effectiveness discussed. The types of radio-transmitters and colour bands used for identification of owls are also described. The results showed that Powerful Owls are present and successfully breed in urban and suburban areas and that they can tolerate moderate levels of disturbance. However, Powerful Owls do require sites with high prey densities, roost trees and trees with suitable breeding hollows. In comparison with Powerful Owls living elsewhere in forests, the urban owls displayed higher tolerance levels to disturbance and were less selective in terms of habitat usage and diet. Home range sizes of urban Powerful Owls also appeared much smaller than those of the forest-dwelling Powerful Owls. This is probably due to the high prey densities in the urban areas. The ecology of the Powerful Owl is compared with that of two owl species from North America, the Northern Spotted Owl (Strix occidentalis caurind) and the Great Horned Owl (Bubo virginianus). In particular, I compared the similarities and differences in habitat requirements and breeding successes in different habitats for the three species. Overall, it would appear that urban areas can support Powerful Owls providing some old-growth trees are maintained to provide nest hollows. Implications for the long-term management of Powerful Owls in urban areas are also discussed.
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Groce, Julie Elizabeth. "Habitat associations of cavity-nesting owls in the Sierra Nevada." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3086.

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Brogan, Daniel S. "Development and Evaluation of the Online Watershed Learning System (OWLS)." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/75213.

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Cyberlearning has the ability to connect learners from diverse settings to educational resources regardless of the learners' proximities to traditional classroom environments. Prior research has shown that hybrid learning systems more effectively improve student learning than do either traditional or cyberlearning approaches used individually. The Online Watershed Learning System (OWLS) is an interactive cyberlearning system for use in hybrid education. It serves as the end user interface of the Learning Enhanced Watershed Assessment System (LEWAS), a watershed monitoring system for use in research and education. The LEWAS/OWLS has been integrated into 26 courses. Within the theoretical framework of situated learning, the OWLS uses data and imagery to situate users at the LEWAS site. The current research has the dual goals of developing the OWLS and evaluating its effectiveness within a hybrid learning environment as part of watershed monitoring education. Within goal 1, HTML5, CSS and JavaScript code (11,112 lines) were used to achieve platform independence, and student and faculty feedback suggests a hierarchy of cyberlearning interface features, where anywhere/anytime access is the most important class of features for these users followed by real-time data visualization, system background information and how-to-use information in descending order. For students at the community college freshmen, university senior and graduate levels, goal 2 investigated how much the OWLS increases student learning of environmental monitoring topics and motivates them to study these topics. For this goal, use of the LEWAS/OWLS increased learning and motivation for most students with the caveats that the these gains were not always statistically significant and that these gains may be caused by use of the LEWAS in general rather than by the OWLS component of it. Additional studies are needed to resolve these issues. Additionally, a pilot test of anonymous user tracking (11,231 page views) showed how it can be used to obtain general information about which groups of users are accessing a cyberlearning system, how they are accessing it, and how navigation through the system can be improved to better match user goals. The full results and their limitations are included along with areas for future work.
Ph. D.
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Books on the topic "Owls"

1

Wendy, Pfeffer. Snowy owls. Parsippany, N.J: Silver Press, 1997.

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Epple, Wolfgang. Barn owls. Minneapolis: Carolrhoda Books, 1992.

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Krystyna, Weinstein, ed. Owls, owls, fantastical fowls. New York: Arco Pub., 1985.

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Niemuth, Neal D. Owls: Owl magic for kids. Milwaukee, Wis: Gareth Stevens Pub., 1996.

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Schuetz, Kari. Owls. Minneapolis, MN: Bellwether Media, 2012.

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Charlesworth, Liza. Owls. New York: Scholastic, 2009.

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Toops, Connie M. Owls. Stillwater, MN: Voyageur Press, 1990.

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Gibbons, Gail. Owls. New York: Holiday House, 2005.

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Winnick, Nick. Owls. New York, NY: AV2, 2010.

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Biel, Timothy L. Owls. Poway, CA: Wildlife Education, Ltd., 2000.

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Book chapters on the topic "Owls"

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Colbourne, Jennifer. "Owls." In Encyclopedia of Animal Cognition and Behavior, 4879–84. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-319-55065-7_1171.

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Colbourne, Jennifer. "Owls." In Encyclopedia of Animal Cognition and Behavior, 1–6. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-47829-6_1171-1.

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Cook, William E. "Owls." In Avian Desert Predators, 71–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60353-2_5.

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Rangel-Salazar, José Luis, and Paula L. Enríquez. "Introduction: The Birds in the Neotropical Region." In Neotropical Owls, 1–6. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57108-9_1.

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Freile, Juan F., Esteban A. Guevara, Cecilia Pacheco, and Tatiana Santander. "The Owls of Ecuador." In Neotropical Owls, 373–95. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57108-9_10.

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Pérez-León, Ricardo, Iselda Vega, and Néstor Herrera. "The Owls of El Salvador." In Neotropical Owls, 397–418. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57108-9_11.

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Claessens, Olivier, Nyls de Pracontal, and Johan Ingels. "The Owls of French Guiana." In Neotropical Owls, 419–45. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57108-9_12.

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Eisermann, Knut, and Claudia Avendaño. "The Owls of Guatemala." In Neotropical Owls, 447–515. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57108-9_13.

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Thorstrom, Russell, and Julio C. Gallardo. "The Owls of Hispaniola and Puerto Rico." In Neotropical Owls, 517–34. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57108-9_14.

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Enríquez, Paula L., and José Raúl Vázquez-Pérez. "The Owls of Mexico." In Neotropical Owls, 535–70. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57108-9_15.

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Conference papers on the topic "Owls"

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Rodliyah, Iis Nur. "From Owls to Humanities: Good Values in “Legend of the Guardians: The Owls of Ga’Hoole”." In 1st International Conference on Interdisciplinary Arts and Humanities. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0008765203820387.

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Rivas, J., I. Arruego, A. Martin-Ortega, J. J. Jimenez, J. Martinez-Oter, J. R. de Mingo, and B. Martin. "Owls as platform technology in OPTOS satellite." In International Conference on Space Optics 2016, edited by Nikos Karafolas, Bruno Cugny, and Zoran Sodnik. SPIE, 2017. http://dx.doi.org/10.1117/12.2296165.

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Bartolini, Cesare. "Mutating OWLs: Semantic Mutation Testing for Ontologies." In International Workshop on domAin specific Model-based AppRoaches to vErificaTion and validaTiOn. SCITEPRESS - Science and and Technology Publications, 2016. http://dx.doi.org/10.5220/0005844600430053.

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Klusch, Matthias, and Andreas Gerber. "Evaluation of Service Composition Planning with OWLS-XPlan." In 2006 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology Workshops. IEEE, 2006. http://dx.doi.org/10.1109/wi-iatw.2006.68.

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Arruego, I., and F. J. Lopez-Hernandez. "Optical orthogonal codes for DS-CDMA in OWLS." In 2017 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE). IEEE, 2017. http://dx.doi.org/10.1109/wisee.2017.8124887.

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Klusch, Matthias, Benedikt Fries, and Katia Sycara. "Automated semantic web service discovery with OWLS-MX." In the fifth international joint conference. New York, New York, USA: ACM Press, 2006. http://dx.doi.org/10.1145/1160633.1160796.

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Székács, András, Inna Székács, Nóra Adányi, and István Szendrő. "Optical Waveguide Lightmode Spectroscopy (OWLS) Immunosensors for Environmental Monitoring." In Biomedical Optics. Washington, D.C.: OSA, 2008. http://dx.doi.org/10.1364/biomed.2008.jma26.

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Flanagan, Mark. "From fledglings to wise owls:: Nurturing talent to new heights." In SA '23: SIGGRAPH Asia 2023. New York, NY, USA: ACM, 2023. http://dx.doi.org/10.1145/3610540.3627014.

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Knott, C., C. Leger, A. Sidhanee, F. Stemp, S. Stoneham, and R. Windsor. "G554(P) Safe as ‘owls’: creating paediatric-oncology specific safety huddles." In Royal College of Paediatrics and Child Health, Abstracts of the RCPCH Conference and exhibition, 13–15 May 2019, ICC, Birmingham, Paediatrics: pathways to a brighter future. BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health, 2019. http://dx.doi.org/10.1136/archdischild-2019-rcpch.537.

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Klusch, Matthias, Patrick Kapahnke, and Benedikt Fries. "Hybrid Semantic Web Service Retrieval: A Case Study with OWLS-MX." In 2008 Second IEEE International Conference on Semantic Computing (ICSC). IEEE, 2008. http://dx.doi.org/10.1109/icsc.2008.20.

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Reports on the topic "Owls"

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Washbum, Brian E. Hawks and Owls. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, December 2016. http://dx.doi.org/10.32747/2016.7208741.ws.

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Hawks and owls can negatively impact a variety of human interests, including important natural resources, livestock and game bird production, human health and safety, and companion animals. Conflicts between raptors and people generally are localized and often site-specific. However, the economic and social impacts to the individuals involved can be severe. Despite the problems they may cause, hawks and owls provide important benefits and environmental services. Raptors are popular with birdwatchers and much of the general public. They also hunt and kill large numbers of rodents, reducing crop damage and other problems. Hawks and owls are classified into four main groups, namely accipiters, buteos, falcons, and owls. All hawks and owls in the United States are federally pro-tected under the Migratory Bird Treaty Act (16 USC, 703−711). Hawks and owls typically are protected under state wildlife laws or local ordinances, as well. These laws strictly prohibit the capture, killing, or possession of hawks or owls (or their parts) without a special permit (e.g., Feder-al Depredation Permit), issued by the USFWS. State-issued wildlife damage or depredation permits also may be required.
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Marcot, Bruce G. Owls of old forests of the world. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1995. http://dx.doi.org/10.2737/pnw-gtr-343.

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Eliza D Stein, Eliza D. Stein. Where do flammulated owls go in the winter? Experiment, July 2018. http://dx.doi.org/10.18258/11686.

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Garcia, V., and C. J. Conway. Standardized Monitoring Strategies for Burrowing Owls on DoD Installations. Fort Belvoir, VA: Defense Technical Information Center, December 2006. http://dx.doi.org/10.21236/ada550344.

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Musgrave, Maria A. What Do Owls, Salamanders, Flycatchers and Cuckoos Have In Common? Office of Scientific and Technical Information (OSTI), September 2016. http://dx.doi.org/10.2172/1329551.

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Blakey, Rachel, Monica Buhler, Lizzy Young, Bob Wilkerson, and Rodney Siegel. Inventory surveys for bats and California spotted owls at Devils Postpile National Monument: Final report. National Park Service, 2023. http://dx.doi.org/10.36967/2300702.

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For its size, Devils Postpile National Monument supports a diverse assemblage of nocturnal fauna. Our summer 2022 surveys recorded 15 bat species within the monument. Five of these species had not been previously confirmed in the monument, including two of the three sensitive species targeted: pallid bat (Antrozous pallidus) and fringed myotis (Myotis thysanodes). No California Spotted Owls (Strix occidentalis occidentalis) were confirmed, but a Great Horned Owl (Bubo virginianus) was recorded. Across the disturbance categories of interest identified by monument leadership (e.g., high, moderate, and low levels of fire and blowdown disturbance), there was little variability in bat species richness, total activity, or individual species occurrence. Sites with moderate levels of disturbance recorded the most species and highest levels of activity compared to high and low disturbance, and both priority species were recorded within all three disturbance categories. Targeted surveys (e.g. radio-tracking, multiple season visits) would be required to determine the importance of the monument for critical life stages of its sensitive bat species, such as breeding. Within the fire-prone North American West, roosting habitat requirements for bats presents a key knowledge gap impeding bat conservation in the region (Loeb and Blakey 2021).
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Johnson, Charles L., and Richard T. Reynolds. Responses of Mexican spotted owls to low-flying military jet aircraft. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2002. http://dx.doi.org/10.2737/rmrs-rn-12.

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Guetterman, J. H., J. A. Burns, J. A. Reid, R. B. Horn, and C. C. Foster. Radio telemetry methods for studying spotted owls in the Pacific Northwest. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1991. http://dx.doi.org/10.2737/pnw-gtr-272.

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Conway, Courtney J., Carol A. Finley, and Victoria Garcia. Migratory Linkages of Burrowing Owls on DoD Installations and Adjacent Lands. Fort Belvoir, VA: Defense Technical Information Center, December 2006. http://dx.doi.org/10.21236/ada547169.

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Ganey, Joseph L., and William M. Block. Dietary overlap between sympatric Mexican spotted and great horned owls in Arizona. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2005. http://dx.doi.org/10.2737/rmrs-rp-57.

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