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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 Possums 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 Possums 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.
2
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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Bowden, Timothy Scott. "Mexican Spotted Owl reproduction, home range, and habitat associations in Grand Canyon National Park." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/bowden/BowdenT0508.pdf.
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Mexican spotted owls (Strix occidentalis lucida) are nocturnal avian predators that are widely distributed in the southwest U.S. and northern Mexico. In 1993, the lucida subspecies was listed as threatened in response to concern over the loss of forest habitats to which the owl is widely associated. However, in the northwestern corner of their range spotted owls primarily inhabit steep-walled rocky canyons. Owl populations inhabiting this region have received less attention than populations using forests, although, canyon populations are important to the persistence of the subspecies, and are subject to different environmental pressures. I investigated the breeding ecology and home range characteristics of Mexican spotted owls within Grand Canyon which supports both forest and rocky canyon habitat. During the study from 2004 - 2006, female fecundity (mean = 0.86), calculated as the number of female fledglings per paired female, was relatively high compared to values reported previously for Mexican spotted owls. Five adult male owls were radio-tracked during the breeding season. I used minimum convex polygons and fixed kernel estimates to describe home range size (mean = 356 ha and 372 ha, respectively) and generated adaptive kernels to describe areas of concentrated use within home ranges. I used GIS to describe vegetation and geology cover types associated with owl use areas. This information was used to determine if spotted owls used landscape cover types disproportionately to their availability. At a landscape level, spotted owl telemetry locations were positively correlated with piñyon-juniper vegetation that occurred within canyons as well as with the Redwall and Muav geologic layers (p
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Askew, Nicholas Paul. "The foraging and conservation ecology of British barn owls Tyto alba." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434103.
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Anderson, Aaron George. "Wildfire Impacts on Nest Provisioning and Survival of Alaskan Boreal Owls." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1493029337791323.
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Mitchell, Aimee Marie. "The effects of release techniques on the reproductive performance and post-fledging juvenile survival of captive-bred Western Burrowing Owls (Athene cunicularia hypugaea) in the Nicola Valley, British Columbia." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/893.
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Reintroduction of captive-bred Western Burrowing Owls (Athene cunicularia hypugaea) in the Nicola Valley, British Columbia, has had limited success in increasing the local breeding population. Traditionally, yearling captive-hatched Burrowing Owls that were paired and released into artificial burrows in the field, held overnight, and provided with supplemental food throughout the breeding season (hard release) have had high post-release dispersal and mortality. In 2005 and 2006, I used an alternative soft-release technique to test for an improvement upon the hard-release technique. The soft release followed the same procedure as the traditional hard release but also included enclosures around burrow entrances to contain the owls for a 2-week period in the field prior to release. I compared immediate post-release dispersal, seasonal survival, and reproductive success for 37 hard-released and 30 soft-released pairs. I radio-tagged 39 of these released owls in order to accurately monitor their activities, regardless of whether they remained at release sites or dispersed. The soft-release technique led to 20% more owls remaining at the release sites, 14% more owls surviving the breeding season, and 20% more owl pairs fledging juveniles.
In addition to investigating adult survival and reproductive success, I examined post-fledging juvenile survival, local recruitment, and habitat use, and adult prey consumption behaviour in order to assess the potential of these aspects to limit the success of the reintroduction. Survival and local recruitment rates of the juveniles of captive-bred adults released with two different techniques were similar to that of juveniles of wild adults in the same study area or in other parts of the Burrowing Owl's range. Juvenile habitat-selection analyses identified the importance of rangeland, and comparisons of prey consumption revealed the rapid development of foraging abilities by captive-bred Burrowing Owls. I concluded that these aspects of the owl's ecology were not negatively affected by a captive upbringing, and therefore not likely limiting the success of the reintroduction.
Overall, the use of an enclosure-based soft-release technique addresses major limitations to the success of releases, and shows promise for increasing the breeding population in this region. This approach can also be applied to recovery efforts throughout the Burrowing Owls' range, and provide guidelines for other species' reintroduction programs.
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Gerakis, J. G. (Jeffrey George). "Aerodynamic measurements on some special wing features of nocturnal owls and their acoustic significance." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63333.
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Smith, Rebecca D. M. "Raptor assemblage, abundance, nesting ecology, and habitat characteristics under intensive forest management in the central Appalachian Mountains." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=3013.
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Thesis (M.S.)--West Virginia University, 2003.Title from document title page. Document formatted into pages; contains xii, 106 p. : col. ill., col. maps. Includes abstract. Includes bibliographical references.
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Engelman, Catherine Allegra. "Ecotoxicological simulation modeling: effects of agricultural chemical exposure on wintering burrowing owls." Texas A&M University, 2008. http://hdl.handle.net/1969.1/85982.
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The western burrowing owl, Athene cunicularia hypugaea, is a Federal Species
of Concern, whose numbers and range have been drastically reduced from historic levels
in Texas. Burrowing owls roost and forage in agricultural areas, and it has been
hypothesized that exposure to insecticides may be a factor in the decline of their
population. Burrowing owls wintering in southern Texas use agricultural culverts in
cotton fields as roost sites, which may increase their risk of exposure to agricultural
chemicals, either through ingestion of contaminated prey or through dermal exposure to
agricultural runoff.
Simulation modeling was used to characterize the risks to individual burrowing
owls wintering in agricultural landscapes in southern Texas due to effects of exposure to
insecticides or other agricultural chemicals. The simulation model was created using
Stella® VII software (High Performance Systems, Inc., New Hampshire, USA). The
model is broken into four submodels simulating (1) foraging behavior of burrowing owls, (2) chemical applications to crops, (3) chemical transfer and fate in the crop soil
and prey items, and (4) chemical exposure in the burrowing owl.
This model was used to evaluate (1) which components of the model most affect
the endpoints, (2) the relationship between increased concentrations of agricultural
chemicals in culverts and subsequent lethal and sublethal effects from dermal exposure
to agricultural runoff, and (3) which agricultural chemicals have the greatest potential to
cause adverse effects in burrowing owls. Model results suggested (1) the half-lives of
agricultural chemicals in birds caused the most variation in the results, and data gaps
exist for several important model components (2), exposure to increased concentrations
of agricultural chemicals in culverts is unlikely to result in lethal effects, but is likely to
lead to sublethal effects in burrowing owls, and (3) the chemicals with the greatest
potential to negatively affect burrowing owls wintering in southern Texas are the OP
insecticides chlorpyrifos, dicrotophos, and disulfoton, the oxadiazine insecticide
indoxacarb, the herbicide trifluralin, and the defoliants tribufos and paraquat. The results
of this model demonstrate the usefulness of simulation modeling to guide future research
related to the conservation of burrowing owls.
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Ibarra, Eliessetch José Tomás. "Andean temperate forest owls : detectability, habitat relationships and reliability as biodiversity surrogates." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51520.
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South American temperate forests are globally exceptional for their high concentration of endemic species. These ecosystems are one of the most endangered biomes on Earth because nearly 60% of forests have been lost. Current knowledge of most Neotropical forest owls is limited. I examined (i) detectability, (ii) occurrence and habitat-resource utilization across spatial scales, and (iii) surrogacy reliability of the threatened habitat-specialist rufous-legged owls (Strix rufipes) and habitat-generalist austral pygmy-owls (Glaucidium nana) in southern Chile. During 2011-2013, I conducted 1,145 owl broadcast surveys, and established 505 vegetation plots and 505 avian point-transects across 101 sites comprising a range of conditions from highly degraded habitat to structurally complex old-growth forest stands. I recorded 292 detections of S. rufipes and 334 detections of G. nana. Detectability for both owls increased with greater moonlight and decreased with environmental noise, and for G. nana greater wind speed decreased detectability. Detection of either species was positively correlated with the detection of the other species. For S. rufipes, occurrence probability ranged from 0.05-1 across sites, and was positively associated with bamboo density and the variability in diameter at breast height of trees (multi-aged forests). For G. nana, occurrence ranged from 0.67-0.98, but the parameter estimates for covariates overlapped zero, meaning they occurred across the full range of habitat conditions. Relative to G. nana, S. rufipes had lower total resource utilization, but achieved similar peak occurrence for resources related to stand-level forest complexity and forest homogeneity at the landscape scale. I found that S. rufipes were reliable surrogates for avian species richness, endemism and measures of functional biodiversity (e.g. large-tree users, understorey users, degree of community specialization). Strix rufipes and specialist avian species and guilds aggregated at the relatively stable, least degraded, sites. This “specialist aggregation” was driven by forest-stand structural complexity. Forest management practices that maintain multi-aged stands with large trees and high bamboo cover will benefit both owls, and will be linked to a higher density of vulnerable endemic species, specialized wildlife communities and, likely, ecosystem stability in temperate forests.Forestry, Faculty of
Graduate
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Krings, Markus Verfasser], Hermann [Akademischer Betreuer] [Wagner, Christine Akademischer Betreuer] Köppl, and Thomas [Akademischer Betreuer] [Künzel. "Embryonic development of owls / Markus Krings ; Hermann Wagner, Christine Köppl, Thomas Künzel." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1211345866/34.
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Wingert, Carie Marie. "SEASONAL FOOD HABITS OF BURROWING OWLS (ATHENE CUNICULARIA) IN HUMAN-ALTERED LANDSCAPES." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/730.
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In 2004, I initiated a year-long study to investigate the food habits of burrowing owls (Athene cunicularia). Burrowing owls have been found in a variety of human-altered landscapes; however, little is known about burrowing owl food habits in urban landscapes. Burrowing owl food habits during the non-breeding season are also largely undocumented, despite increasing concern over the survival of overwintering burrowing owls. Differences in prey consumption between reproductive and non-reproductive owls during the breeding season have not yet been examined. I collected pellets over a 12 month period at four study sites affected by different levels of human alteration in the southern San Joaquin Valley of California. Data was collected at four study sites representing natural (Wind Wolves), semi-natural (Allensworth Ecological Reserve), agricultural (Friant Kern Canal), and urban (Bakersfield) landscapes. Invertebrates, primarily ground dwelling insects, were the most commonly consumed prey type, found in 96% of all pellets examined. Among vertebrates, mammals were the most commonly consumed (18.5% of all pellets). Shannon-Weiner diversity indices identified differences in prey diversity consumed between seasons within each site and between sites within seasons, except during the breeding season where diversity was the same at all sites. The diversity indices at Wind Wolves (natural site) and Bakersfield (urban site) were the same, while the diversity indices at Allensworth Ecological Reserve (semi-natural site) and Friant Kern Canal (agricultural site) were the same. Binary logistic regression was used to determine if consumption of individual prey types varied by site, season, and a site/season interaction. Mammals were consumed in greater proportions during the breeding season at most sites compared to other seasons. The proportion of pellets containing mammals during the breeding season decreased as the level of human-alteration increased, with mammal consumption highest at Wind Wolves (60.0%) and lowest at Bakersfield (13.1%). Consumption of several insect categories differed by site and/or season (Coleoptera, Dermaptera, and Orthoptera), but overall consumption of insects was not different by either factor. To assess differences in prey consumption between reproductive and non-reproductive owls, pellets collected during the 2005 breeding season were classified as having come from a nest burrow or a non-nest burrow based on positive identification of reproduction. Shannon-Weiner diversity indices and binary logistic regression were calculated for this data set. No differences were detected in overall diversity or in the proportional consumption of individual prey categories. The results of this study indicate that burrowing owls have a highly variable diet and may have sufficient ecological plasticity to allow them to adjust their food habits to the prey species available in human-altered landscapes. However, the implications of altered food habits on burrowing owl fitness in heavily disturbed landscapes, particularly urban landscapes, needs further study.
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Rieder, Kerry Ann. "DERIVED RELATIONAL RESPONDING: ASSESSING THE RELATIONSHIP BETWEEN THE PEAK-E AND OWLS-II ASSESSMENTS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1949.
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The current study examined the relationship between the relational abilities of 13 children (92.31% of which were diagnosed with autism) and their corresponding performance on a widely used language assessment tool. The relational abilities of the participants were assessed using the Prompting the Emergence of Advanced Knowledge Equivalence Pre-Assessment (PEAK-E) and language skills were assessed with the Oral and Written Language Scales- Second Edition (OWLS-II). The data indicated a strong, significant correlation between participant scores on the PEAK-E and the OWLS-II assessments (r = .888, p<.01) which is further analyzed in each of the four subsets of the OWLS-II Oral Expression (r = .861, p<.01), Listening Comprehension (r = .84, p<.01), Written Expression (r = .792, p<.01), and finally Reading Comprehension (r = .762, p<.01). Results further demonstrate the validity of the PEAK-E assessment in individuals with autism and other related disorders.
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Malm, Lisa. "Effects of snow cover and rain on breeding success in tawny owls Strix aluco." Thesis, Högskolan i Skövde, Institutionen för vård och natur, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5114.
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Breeding success in Tawny owls is known to be affected by both prey abundances and weather conditions. In Finland, an effect of winter conditions on hatching date was found and in Hungary it has been shown that snow cover affect chick survival negatively. In this study the effect of snow cover on clutch size and egg and chick survival is investigated on a population of Tawny owls in Västra Götaland, Sweden. Since rainfall has been shown to have a disturbing effect on incubation and breeding, the amount of rainfall during breeding season was compared to egg and chick survival. No significant effect on clutch size was found due to snow cover. On egg and chick survival, snow cover had a significant negative effect when other important factors, e.g. access to prey and the amount of inexperienced and young breeders, was controlled. A significant positive correlation was found between rainfall and egg and chick survival, but no significant effect on rainfall was found after controlling for other factors such as the amount of caught prey. There was also a significant correlation between rainfall and the percentage of birds in prey, where years with more rainfall had less birds in prey, a variable that usually is higher during low vole abundances. To support themethod of using prey found in nest boxes as indicators of prey abundances it was shown that the total amount of prey found in nest boxes and the percentage of birds in prey had a positive respectively negative significant effect on chick survival. These results indicate that the chances of chick survival might be affected before the eggs are laid and that there is an indirect positive effect of rain on breeding success due to higher amounts of preferred prey.Både bytestillgång och väderförhållanden har visat sig påverka häckningsframgången hos kattugglor. I Finland har en effekt av vinterförhållanden hittats på kläckningsdatum och i Ungern finns en påvisad negativ effekt av snötäcke på ungöverlevnaden. I den här studien undersöks effekten av snötäckets djup och långvarighet på kullstorleken och ägg- och ungöverlevnaden hos en kattugglepopulation i Västra Götaland. Eftersom regn har visat sig störa och påverka häckningen, har mängden nederbörd under häckningssäsongen jämförtsmed ägg- och ungöverlevnad. Ingen signifikant effekt på kullstorlek p.g.a. snötäcke hittades. På ägg- och ungöverlevnaden hade snötäcket en negativ effekt efter att andra viktiga faktorer som bytestillgång och andelen oerfarna och unga, häckande honor var kontrollerad. En signifikant positiv korrelation hittades mellan nederbörd och ägg- och ungöverlevnad, men efter att ha kontrollerat för andra viktiga faktorer, som mängden fångade byten, hittades ingen signifikant påverkan av nederbörd. Det fanns också en signifikant korrelation mellan regn och andelen fågel bland byten, där år med mer regn hade en mindre andel fågel i bytesfördelningen, en variabel som vanligtvis är högre under låg sorktillgång. För att ge stöd åt metoden att använda byten funna i holkar som indikatorer på bytestillgång finns en påvisad positiv effekt av den totala mängden funna byten och en negativ effekt av andelen fågel bland byten på ungarnas överlevnad. Resultaten indikerar att chansen för ungöverlevnad kan vara påverkad innan äggen är lagda och att det finns en indirekt positiv påverkan av regn påhäckningsframgång p.g.a. en större tillgång av föredragna byten.
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Prené, Emma. "Dumbledore, Remembrall and OWLs : Word formation processes of neologisms in the Harry Potter books." Thesis, Linnéuniversitetet, Institutionen för språk och litteratur, SOL, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-24075.
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This thesis investigates the word formation processes of the neologisms in the Harry Potter books by JK Rowling. The aim is to find the frequencies of these processes and then discuss why the frequency looks this way. By collecting and analysing the neologisms with the help of the classification of Plag (2003) and Ljung (2003), the frequencies of the different formation processes is established. The reasons why the distribution of word formation processes looks this way is then discussed and compared to the background information about the author. The conclusion is that compound is the most frequent word formation of this sample. The arguments why the distribution looks this way could be that the semantic meaning of the Harry Potter words is important and that many of the neologisms are based on humour, mythology and folklore.
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Nandy, Palash. "On electric owls : implicit life-stories of robots and their impact on human empathy." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106051.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 93-97).
Robots are moving from factories to people's homes taking on the roles of artificial pets, tutors and companions. If we are to have emotionally engaging robots, we must understand how we can design robots that people feel empathy towards. In this work, I explore one design criteria for such robots: implicit life stories or the ability for a robot to experience the world we share, be transformed by that experience and communicate that experience to us. Through the construction of novel robots that can have implicit life-stories, and through human subject studies I show that such robots can evoke empathy. I also show that empathy for robots can impact empathy for other human beings.
by Palash Nandy.
S.M.
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Mazur, Kurt M. "Spatial habitat selection by barred owls, Strix varia, in the boreal forest of Saskatchewan, Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq30518.pdf.
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Larson, Kyle Blake. "Nest habitat selection of burrowing owls in relation to soils, burrow availability, and burrow temperature." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Summer2009/K_Larson_072409.pdf.
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Thesis (M.S. in environmental science)--Washington State University, August 2009.Title from PDF title page (viewed on Sept. 17, 2009). "School of Earth and Environmental Sciences." Includes bibliographical references (p. 35-42).
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Lewis, Leah R. "Habitat Characteristics of Mexican Spotted Owls (Strix occidentalis lucida) in the Canyonlands of Southern Utah." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3335.
Full textAbstract:
I studied the habitat characteristics of Mexican Spotted Owls (Strix occidentalis lucida), a federally threatened species, in the canyonlands region of southern Utah. Vegetative and geologic features were measured within 10m wide belt plots at each current or historic nest/roost site. Based on our findings, past research, and species life history characteristics, I constructed a species distribution model (SDM) predicting Mexican Spotted Owl distribution in Utah for the Colorado Plateau region. The SDM was generated using the following inputs as important habitat variables: elevation, aspect, surface ratio, curvature, slope, geology, and vegetation. Program R was used for model development and generation. The SDM was generated using an ensemble model approach by combining three modeling techniques: random forest, logistic regression, and maximum entropy. This study combines measured habitat characteristics, with sophisticated geographic information system (GIS) tools and SDMs to provide managers with an informative and useful toolkit for Mexican Spotted Owl conservation.
Chapter 2 discusses modeling techniques and SDM development. I detail how individual models were constructed using random forest, logistic regression, and maximum entropy and how these were combined into an ensemble model. Final models indicated that several vegetative and geologic characteristics were considered important habitat characteristics for predicting Mexican Spotted Owl presence within the Colorado Plateau. The SDMs produced eight distribution maps predicting Mexican Spotted Owl presence and probability of occurrence in Utah for the Colorado Plateau region.
Chapter 3 explains the use of SDMs by managers and synthesizes findings of measured habitat characteristics for southern Utah. For habitat characteristics I measured a combination of vegetative and geologic features within 10m wide belts at current and historic Mexican Spotted Owl sites. Vegetative features measured included: height and species of all trees and shrubs, position of tree or shrub within plot, presence of canopy cover, and tree diameter at breast height (DBH). Geologic features measured included: geologic formation type, wall height, structure type, number of caves, and number of solution cavities. I found that canyon width and density of vegetation > 2.5 m tall were significantly correlated with Mexican Spotted Owl presence.
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Kettler, Lutz [Verfasser], Hermann [Akademischer Betreuer] Wagner, and Jörg [Akademischer Betreuer] Mey. "Morphological and behavioral mechanisms underlying sound localization in barn owls / Lutz Kettler ; Hermann Wagner, Jörg Mey." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1127232037/34.
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Orlowski, Julius [Verfasser], Hermann [Akademischer Betreuer] Wagner, and Yoram [Akademischer Betreuer] Gutfreund. "Visual search in barn owls: from feature to conjunction search / Julius Orlowski ; Hermann Wagner, Yoram Gutfreund." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1127740881/34.
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Pauzé, Marc D. "Predation by great horned owls and red-tailed hawks in a prairie landscape enhanced for waterfowl." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29464.
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Several species of raptors are found in prairie landscapes managed and enhanced for waterfowl. Red-tailed Hawks (Buteo jamaicensis ) and Great Horned Owls (Bubo virginianus) may benefit from such management in a manner that is counter to its goals and objectives; that is, waterfowl may comprise a significant proportion of their diet, resulting in a decline in waterfowl numbers. The overall aims of this three-year study were to determine whether the feeding habits of the two raptor species are selective and to determine if waterfowl is a preferred prey group. The diet was determined through pellet analysis, prey remains and direct nest observations during the nestling growth period. Availability of most prey species was assessed through small mammal trapping and by conducting waterfowl censuses. It was determined that both raptors select for duck species. The average waterfowl biomass consumed per nestling represented 21.5% of the total biomass consumed for Great Horned Owls and 23.5% for Red-tailed Hawks. (Abstract shortened by UMI.)
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Weger, Matthias Verfasser], Hermann [Akademischer Betreuer] [Wagner, and Horst [Akademischer Betreuer] Bleckmann. "Morphological and functional investigations on feather specializations of owls (Strigiformes) / Matthias Weger ; Hermann Wagner, Horst Bleckmann." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162063734/34.
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Weger, Matthias [Verfasser], Hermann [Akademischer Betreuer] Wagner, and Horst [Akademischer Betreuer] Bleckmann. "Morphological and functional investigations on feather specializations of owls (Strigiformes) / Matthias Weger ; Hermann Wagner, Horst Bleckmann." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162063734/34.
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Graf, Roman. "Vergleichende singuläre Zell-Untersuchungen im CLSM und OWLS : ein Beitrag zur Entwicklung von in vitro Monitoring-Systemen /." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13722.
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Hockenbary, Chad Evan. "Exploring relationships among recreation, habitat type, and Mexican spotted owls on the Colorado Plateau in Southern Utah." Thesis, Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/hockenbary/HockenbaryC1211.pdf.
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The Mexican spotted owl (Strix occidentalis lucida) was listed as "threatened" in 1993 by the U.S. Fish and Wildlife Service. In Utah, the spotted owl is associated with rocky canyons that attract high levels of human recreation. Recreation could potentially have negative effects on the owl. I investigated roost behavior, territorial occupancy rates, and reproduction in canyon habitats that differed in recreation level and habitat condition (e.g., xeric versus mesic environments). Surveys were conducted in four areas in Utah: Zion and Capitol Reef National Parks, Grand Staircase-Escalante National Monument, and the Cedar Mesa-Elk Ridge highland. In Chapter 2, I evaluated possible differences in behaviors by fledglings across different levels of recreation. Fledgling diurnal behaviors were dependent on recreation level (P < 0.05). Fledglings in both recreation classes spent approximately = 50% of their time roosting, but fledglings associated with high-recreation territories spent more time in maintenance behaviors (13% vs. 4%) and less time in vigilant behaviors (29% vs. 35%) than did those in low-recreation territories. In Chapter 3, results from a top-ranked regression model indicated potential association between owl site occupancy rates and habitat type, with mesic sites showing higher occupancy than xeric sites in 2008: 0.75 (95% CI = 0.57 - 0.87) and 0.50 (95% CI = 0.27 - 0.73). Recolonization rate was 0.53 (95% CI = 0.28 - 0.76) for mesic sites and 0.10 (95% CI = 0.02 - 0.37) for xeric sites. Extinction rate was constant across years and sites (0.25; 95% CI = 0.15 - 0.39). Detection probability was 0.89 (95% CI = 0.82 - 0.94) across all three years of study. The number of fledglings per pair was greater in 2009 (0.94) than 2008 (0.25) and 2010 (0.50). My results suggest that recreation could have altered diurnal roost behavior of fledglings but was not related to occupancy and reproduction of Mexican spotted owls.
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Wellicome, Troy I. "Effects of food on reproduction in burrowing owls, Athene cunicularia, during three stages of the breeding season." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0010/NQ60040.pdf.
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Uhmann, Tanys V. "The development of a habitat suitability index model for burrowing owls in southwestern Manitoba and southeastern Saskatchewan." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62861.pdf.
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Schulwitz, Sarah E. "Informing Conservation Management Using Genetic Approaches: Greater Sage-Grouse and Galápagos Short-Eared Owls as Case Studies." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849663/.
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Small isolated populations are of particular conservation interest due to their increased extinction risk. This dissertation investigates two small wild bird populations using genetic approaches to inform their conservation. Specifically, one case study investigated a Greater Sage-grouse (Centrocercus urophasianus) population located in northwest Wyoming near Jackson Hole and Grand Teton National Park. Microsatellite data showed that the Jackson sage-grouse population possessed significantly reduced levels of neutral genetic diversity and was isolated from other Wyoming populations. Analysis with single nucleotide polymorphisms (SNPs) and microsatellite data provided further evidence that the population's timing of isolation was relatively recent and most likely due to recent anthropogenic habitat changes. Conservation recommendations include maintaining or increasing the population's current size and reestablishing gene flow with the nearest large population. The second case study investigated the genetic distinctiveness of the Floreana island population of the Galápagos Short-eared Owl (Asio flammeus galapagoensis). Mitochondrial DNA sequence data did not detect differences across nine island populations, yet microsatellite and morphometric data indicated that limited gene flow existed with the population and surrounding island populations, which appeared asymmetric in direction from Floreana to Santa Cruz with no indication of gene flow into Floreana. These results have important conservation implications and recommend that the Floreana Short-eared Owl population be held in captivity during the rodenticide application planned for an ecosystem restoration project in 2018. The population is less likely to receive immigrants from surrounding island populations if negatively effected by feeding on poisoned rodents.
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Janos, Gregg A. "Utilizing Acoustic Methods to Identify Bat Species, and to Assess Their Habitat Use and Perception of Owls." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1363428258.
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Van, Niekerk Christiaan Hermanus. "Past and present climates : owl pellet composition as an indicator of local climatic change." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52395.
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Thesis (MScAgric)--University of Stellenbosch, 2001.ENGLISH ABSTRACT: During Holocene times a considerable deposit of barn owl pellet material accumulated in the Hot Pot Cave at De Hoop Nature Reserve on the southern coast of the Western Cape Province, South Africa. An excavation of this accumulation has yielded information on barn owl prey species over the past some two millennia. Four distinct layers were excavated and radiocarbon-dated to AD 381, AD 615, AD 991 and AD 1417. The micromammalian cranial contents of these layers were compared to material from two pellet collections that represent modem bam owl predation at De Hoop (AD 2000). Comparisons were made from three perspectives: (1) physical size measurements of certain cranial parameters, (2) micromammal community species composition and (3) community structure indices, such as the Shannon-Wiener diversity index, Simpson's diversity index and the species equitability index. By extrapolating from known ecological distribution information of the relevant prey species, these data were used to recreate the local climate at the time of the accumulation of the layers. The results were compared to other palaeoclimate models for the region as a test of validity. It was found that the lower two layers of the sequence represented mild conditions with possibly more grass than in recent times, while the upper layers represented cool weather with a possible increase in scrub. AD 381 was found to be somewhat dry and mild, AD 615 to be the wettest level and possibly milder than AD 381, AD 991 to be the coolest of all the levels and dryest of the ancient levels, AD 1417 to be somewhat cool and probably drier than AD 615, but wetter than AD 381, and AD 2000 to be the mildest and dryest of all levels, with the artificial influence of nearby agricultural activities evident.
AFRIKAANSE OPSOMMING: Tydens die Holoseen tydperk het 'n relatief groot hoeveelheid nonnietjie-uil bolusmateriaal versamel in Hot Pot Grot in die De Hoop Natuurreservaat aan die Wes-Kaapse suidkus, Suid- Afrika. Opgrawings van hierdie bolusversameling het waardevolle en insiggewende inligting aandie lig gebring rakende nonnetjie-uil prooi tydens ongeveer die afgelope tweeduisend jaar. Vier defnitiewe lae is opgegrawe en deur radiodatering is die lae se datums vasgestelop 381, 615, 991 en 1417 n.e. Deur gebruik te maak van kraniale kriteria. is die mikrosoogdier inhoud van die opgrawings vergelyk met dié van twee bolusversamelings wat die huidige uilprooi (2000 n.Ci) in De Hoop verteenwoordig. Die vergelykings is op drie maniere getref: (1) fisiese grootternates van sekere kraniale parameters, (2) species-samestelling van die mikrosoogdiergemeenskap en (3) gemeenskap-struktuur indekse nl. die Shannon-Wiener diversiteitsindeks, Simpson se diversiteitsindeks en die species-gelykheid indeks. Deur ekstrapolasie vanaf bekende ekologiese verspreidingsinligting rakende die betrokke species, is hierdie data gebruik om die klimaat van daardie tydperke te herskep op 'n streeksbasis en vergelyk met ander paleoklimaat-modelle om die geldigheid daarvan te beproef. Die resultate het getoon dat die onderste (oudste) twee lae warmer toestande met moontlik meer gras verteenwoordig, terwyl die boonste twee lae koeler weer met moontlik meer bosse verteenwoordig. Daar is verder gevind dat 381 n.e. redelik droog en warm was, 615 n.e. die natste laag en moontlik warmer as 381 n.e., 991 n.e. die koudste van al die lae en droogste van die grot-lae, 1417 n.e. redelik koel en moontlik droëer as 615 n.e., maar natter as 381 n.e., en 2000 n.C. die warmste en droogste van al die lae, met kunsmatige invloed van nabygeleë landbou aktiwiteite.
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Coles, Christopher Frederick. "Breeding, survival, movements and foraging of tawny owls Strix aluco in a managed spruce forest : a spatial approach." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4344/.
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In 1996-98,1 studied the spatial ecology of the tawny owl Strix aluco (L.) in Kielder, a managed spruce forest in Northumberland, northern England. I employed radio tracking in an individual-based approach, estimating densities of field voles Microtus agrestis, the owl's main prey in Kielder Forest, using a calibrated sign index. In both 1996, a low vole year, and 1997, an increasing vole year, juvenile mortality was high, and largely due to starvation and predation. 55.4% of the variation in the mean number of days survived post-fledging per brood was explained by a model comprising the variables mean clutch hatch date, brood size, and voles per hectare at the clear-cuts nearest natal nest boxes in the spring of breeding. Nine percent of non radio tagged juveniles were recruited in 1997-98, in comparison with none of the radio marked individuals. Post onset of dispersal, vole abundance explained 25.7% of the variation in the time that juveniles spent in different areas. Juveniles did not become more sedentary over time nor avoided roosting in occupied territories. Adult home ranges contained more grassy areas than expected from their abundance in the study area, but not from their abundance at watershed level. The absolute areas of grassy habitat and lengths of habitat edge that were included in home ranges varied widely. Range area was correlated with distance to the nearest clear-cut, but not with variation in estimated vole abundance. Nocturnal activity centred on clear-cuts, other grassy areas, and mature forestry plantations. Field voles constituted 59% of prey deliveries to two nest boxes. The time that owls spent at clear-cuts was not correlated with estimated vole abundance there. Tawny owls are generalist predators, but their spatial ecology was strongly influenced by the abundance of their main prey species and the distribution of habitats that supported it.
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Van, der Horst Shirley Therese. "Road and landscape fragmentation effects on tawny owls: density, population trend, and intra-and inter-year territory occupancy." Master's thesis, Universidade de Évora, 2017. http://hdl.handle.net/10174/21237.
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A urbanização é um dos maiores factores que impulsiona mudanças na paisagem
e na biodiversidade e os seus efeitos ainda não são entendidos na totalidade. Apesar da
coruja-do-mato (Strix aluco) não estar ameaçada a nível europeu ou global, é uma das aves
que é frequentemente encontrada atropelada no sul de Portugal. Determinámos que a
densidade de coruja-do-mato era mais baixa perto de estradas principais, com pouca
diferença entre secundárias e de terra, mas a tendência populacional era negativa em
estradas secundárias e principais. As variações inter e intra-anuais da presença de coruja-
do-mato eram ambas mais elevadas em territórios perto de estradas secundárias,
sugerindo uma elevada instabilidade. Os nossos resultados fazem-nos crer que os esforços
de conservação devem-se focar tanto em estradas secundárias como principais, e nos seus
efeitos primários e secundários; Road and landscape fragmentation effects on tawny owls: density,
population trend and intra- and inter-year territory occupancy
Abstract: Urbanization is one of the major movements that impulses landscape and
biodiversity change, and its effects have yet to be fully understood. Although the tawny
owl (Strix aluco) is not threatened at European or global scale, it is one of the birds that is
often found as roadkill in southern Portugal. We determined density values to be lower
near main roads, and to have little difference between secondary and dirt roads, yet trend
to be negative for main and secondary roads. Inter and intra-year variations in territory
occupancy for the tawny owl in our study area were both highest in territories near
secondary roads, suggesting high instability. Our results lead us to believe that
conservation efforts should be focused on both main and secondary roads, and on both
their primary and secondary effects.
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Cary, Brian Lee 1966. "Behind the facade of the Owls Club: The forgotten history of Tucson's turn-of-the-century bachelor residence." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/291848.
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There are a lot of misconceptions about the Owls Club, located at 378 N. Main Street in Tucson, Arizona. Many of these are the result of the popularity of the bachelors who formed Tucson's first men's club, The Owls, in the late nineteenth century. The restoration/renovation of the building in 1986 facilitated a revival of popular notions that the Owls Club served as a clubhouse for the gregarious society of men. However, by examining the building in its appropriate context of "Tucson Boosterism," different conclusions are drawn. Although the residence is connected with members of The Owls, the buildings construction after the organization's social and group emphasis had ended. Instead, research revealed that the Owls Club was designed as a single-family residence to promote the development of an elite Anglo neighborhood in Tucson while, simultaneously, reinforcing its patrons' position in society.
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Johnston, Jennifer Lynn Atkinson Samuel F. "Home range analysis of rehabilitated and released great horned owls (Bubo virginianus) in Denton County, Texas, through radio telemetry." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-5159.
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Carvalho, Catarina Silva. "Role of climate on barn owls road-kill likelihood and the effect on population viability in future climate change." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/16084.
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Mestrado em Ecologia AplicadaRoads represent a new source of mortality due to animal-vehicle risk of collision threatening log-term populations’ viability. Risk of road-kill depends on species sensitivity to roads and their specific life-history traits. The risk of road mortality for each species depends on the characteristics of roads and bioecological characteristics of the species. In this study we intend to know the importance of climatic parameters (temperature and precipitation) together with traffic and life history traits and understand the role of drought in barn owl population viability, also affected by road mortality in three scenarios: high mobility, high population density and the combination of previous scenarios (mixed) (Manuscript). For the first objective we correlated the several parameters (climate, traffic and life history traits). We used the most correlated variables to build a predictive mixed model (GLMM) the influence of the same. Using a population model we evaluated barn owl population viability in all three scenarios. Model revealed precipitation, traffic and dispersal have negative relationship with road-kills, although the relationship was not significant. Scenarios showed different results, high mobility scenario showed greater population depletion, more fluctuations over time and greater risk of extinction. High population density scenario showed a more stable population with lower risk of extinction and mixed scenario showed similar results as first scenario. Climate seems to play an indirect role on barn owl road-kills, it may influence prey availability which influences barn owl reproductive success and activity. Also, high mobility scenario showed a greater negative impact on viability of populations which may affect their ability and resilience to other stochastic events. Future research should take in account climate and how it may influence species life cycles and activity periods for a more complete approach of road-kills. Also it is important to make the best mitigation decisions which might include improving prey quality habitat.
As estradas representam uma nova fonte de mortalidade para vida selvagem devido ao risco de colisão com veículos apresentando mais uma ameaça à viabilidade das suas populações. O risco de atropelamento de cada espécie depende das características das estradas e das características bio-ecológicas da espécie. Neste estudo pretendemos conhecer a importância dos parâmetros climáticos (temperatura e precipitação) em conjunto com tráfego e os períodos do ciclo de vida da espécie e perceber o papel da seca na viabilidade populacional de coruja-das-torres afetadas por mortalidade nas estradas em três cenários: mobilidade elevada, elevada densidade populacional e a combinação dos cenários anteriores (misto) (Manuscrito). Para o primeiro objetivo correlacionaram-se os vários parâmetros (clima, tráfego e períodos do ciclo de vida). Usaram-se as variáveis mais correlacionadas para construir um modelo misto preditivo (GLMM) da influência dos mesmos. Através de um modelo populacional avaliou-se a viabilidade populacional nos três cenários. O modelo revelou que a precipitação, tráfego e dispersão têm uma relação negativa com os atropelamentos, embora esta não seja significativa. Os resultados foram diferentes, o cenário de mobilidade elevada resultou numa maior diminuição da população e em maiores flutuações ao longo do tempo apresentando um maior risco de extinção do que os restantes cenários. O cenário de elevada densidade populacional resultou numa maior estabilidade das populações com menor risco de extinção e o cenário misto apresentou resultados semelhantes ao cenário de elevada mobilidade. A precipitação parece apresentar um papel mais indireto na influência dos atropelamentos, influenciando a presença de presas a qual pode determinar o sucesso reprodutivo e a atividade desta espécie. A menor densidade populacional representa um maior risco para a viabilidade populacional e resiliência a outros eventos estocásticos. Estudos futuros deverão ter em conta o clima e o modo como este influencia os períodos de atividade das espécies e a incidência de atropelamentos de modo a tomar as medidas de mitigação mais adequadas que poderão passar pelo melhoramento da qualidade do habitat das presas.
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Johnston, Jennifer Lynn. "Home range analysis of rehabilitated and released great horned owls (Bubo virginianus) in Denton County, Texas, through radio telemetry." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc5159/.
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Raptor rehabilitation has become commonplace globally, yet studies on the survival and adaptation of great horned owls (Bubo virginianus) after release has been neglected to an appreciable extent. The primary objective of this study is to provide quantitative data on the success of rehabilitated and released great horned owls in the North Texas region. Owls (N=12) were rehabilitated and released onto the Ray Roberts Greenbelt Corridor in Denton County, Texas, and monitored using radio telemetry to evaluate home range (November 2002 - February 2005). With approximately 75% of the birds released for this study surviving until transmitter battery failure, it is believed that the rehabilitation process was successful for these birds.
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Byrne, Josephine. "Madness and the art of writing : constructions of madness in Janet Frame's Owls do cry and Faces in the water /." Title page and introduction only, 1992. http://web4.library.adelaide.edu.au/theses/09AR/09arb9951.pdf.
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Berigan, William John. "Nest site selection of California spotted owls (Strix occidentalis occidentalis) in the Lassen National Forest analyzed at several spatial scales." CSU, Chico Electronic Masters Thesis, 2009. http://hdl.handle.net/10211.4/77.
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Goad, Mary Susanna. "SUMMER HABITAT AND NEST SITE SELECTION OF ELF OWLS (MICRATHENE WHITNEYI) AT SAGUARO NATIONAL MONUMENT, ARIZONA (SONORAN-DESERT, HABITAT USE)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275351.
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Alexander, Callan. "Passive acoustic monitoring of Australia’s largest owl: Using automatic species recognition to detect the powerful owl (Ninox strenua)." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/227461/1/Callan_Alexander_Thesis.pdf.
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This thesis utilises passive acoustic monitoring as a framework to study Powerful Owls (Ninox strenua) in south-east Queensland. The study quantitively describes the vocalisations of adult and chick Powerful Owls and utilises open-source machine learning software to create automated species recognition tools for use in citizen science programs. The results indicate that call characteristics historically used to sex adult Powerful Owls are likely unreliable. Testing of the automated call recognisers resulted in highly promising outcomes, which suggests that they are likely to be valuable tools for future study.
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Williams, Jennifer M. "An Application of Digital Video Recording and Off-grid Technology to Burrowing Owl Conservation Research." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699953/.
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Through this research, engineering students and conservation biologists constructed an off-grid video system for observing western burrowing owls in El Paso, Texas. The burrowing owl has a declining population and their range decreasing, driving scientists' interest to see inside the den for observing critical nesting behavior. Texas Parks and Wildlife Department (TPWD) biologists wanted videos from inside the dark, isolated hillside owl burrows. This research yielded a replicable multi-camera prototype, empowering others to explore applications of engineering and wildlife monitoring. The remote station used an off-the-shelf video recording system, solar panels, charge controller, and lead acid batteries. Four local K-12 science educators participated in system testing at Lake Ray Roberts State Park through the Research Experiences for Teachers (RET, NSF #1132585) program, as well as four undergraduate engineering students as senior design research.