Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 29 for “"Aerial surveys"”.
-
Estimating occupancy and abundance of shorebirds through aerial surveys in the Illinois river valley
… wetland loss and degradation in the region. Aerial surveys are commonly used to quantify waterfowl abundance and estimate population size, but few attempts have been made to evaluate aerial surveys for other guilds of wetland birds. We investigated whether aerial surveys can be used to …
-
Analysis of Aerial Surveys and Tolerance of Landowners for a Canada Goose Flock in Northeastern South Dakota
… toward the geese and goose flock expansion. Aerial circling surveys used to estimate numbers of breeding pairs of Canada geese were evaluated in 1974 and 1975. Analysis of variance factors of weeks, wetland units and week by unit interactions were significant (p<.05) in tests on indicated …
-
Evaluating population estimates of mountain goats based on citizen science
… to estimates by biologists and raw counts from aerial surveys at a subset of 25 and 11 sites, respectively. I used multiple observer surveys to calibrate the indices of abundance for the effect of observer variation between volunteers and biologists. I used N-mixture models, which calculated …
-
Evaluating population estimates of mountain goats based on citizen science
… to estimates by biologists and raw counts from aerial surveys at a subset of 25 and 11 sites, respectively. I used multiple observer surveys to calibrate the indices of abundance for the effect of observer variation between volunteers and biologists. I used N-mixture models, which calculated …
-
Remote-sensing of underground caverns using a full-Maxwell's equations FDTD model
… the vicinity of the structures, as well as via aerial surveys. Sandia National Labs and the University of New Mexico have collaborated to study the feasibility of detecting and characterizing underground structures, specifically hollow rectangular-shaped caverns. This thesis covers the …
-
Spatio-Temporal Variation in Ringed Seal (Pusa Hispida) Density and Habitat Use in the Last Ice Area
… conditions. Using observations from aerial surveys, this thesis provides the first study on spatio-temporal variation in ringed seal density and habitat use in their northern most range in the Canadian High Arctic, highlighting the importance of bathymetry and marine terminating …
-
Utilization of aerial sensor platforms for characterization of land-based, distributed radiological sources for radiological event response
… sources and the environment using an unmanned aerial vehicle (UAV) and commercial-of-the-shelf hardware and software was developed and implemented. High-altitude aerial surveys typically used for widespread distributed sources lack the spatial resolution needed to accurately describe the …
-
Population Estimation Procedures For Elk and Deer in the Black Hills, South Dakota: Development of a Sightability Model and Spotlight Survey
… underestimates of total counts when conducting aerial surveys for ungulates. The Black Hills of South Dakota are characterized by dense ponderosa pine (Pinus ponderosa), which affects sightability and accurate censusing of elk (Cervus elaphus). Few studies have evaluated aerial survey …
-
Population and Productivity of a Flock of Giant Canada Geese in Northeastern South Dakota
… be 1,880 geese. Recommendations were to continue aerial surveys in the spring and late summer and to supplement them with annual searches of the sample quarter sections used in this study. One hundred three nests were found on islands and artificial nesting structures. Mean clutch size was 5.44 …
-
Evaluation of Methodology Use to Estimate Population Size, Sex and Age Ratios, and Mortality of White-tailed and Mule Deer in the Missouri River Breaks Region of South Dakota
… assess visibility factors associated with winter aerial deer surveys. Radiotelemetry was used to determine if radio-collared deer were observed during aerial surveys. One hundred three radio-collared deer were observed during aerial surveys from 1998-2000. Stepwise logistic regression indicated …
-
Pest Management Strategies for Longhorn Army Ammunition Plant and an Assessment of Aerial Radiography for Hazard Rating Pine Stands for Southern Pine Beetle Infestation
… at military installations is limited. The use of aerial videography is a relatively new technology and is currently used for aerial surveys and is being developed for hazard rating for southern pine beetle. The purpose of this study was to apply existing sampling methods for various insects and …
-
The Relationship of Wetland Characteristics to Avian Cholera (Pasteurella Multocida) Outbreaks in the Rainwater Basin Area of Nebraska
… of 1,715,840 live birds were counted during aerial surveys (U. S. Fish and Wildlife Service, Nebraska) on 8 study wetlands during spring of 1987, and 1,054,036 live birds were counted on 7 study wetlands during spring of 1988. The total number of dead birds picked up from study wetlands …
-
The Ecology of Large Marine Predators in the Hauraki Gulf
… eden brydei. Double-observer line transect aerial surveys were conducted in the Gulf from November 2013 to October 2014 to collect distribution data on cetaceans, sharks, and their prey patches, as well as to collect abundance data using mark-recapture distance sampling methods. …
-
Changes in nesting numbers and breeding success of African White-backed Vultures in northern Botswana
… to breeding success. I used information from aerial surveys conducted between 2006 and 2017 in Khwai and Linyanti, two of the most important breeding areas for this species in northern Botswana to examine changes in nesting numbers and breeding success. The results showed a 53.5% decline in …
-
Using Environmental DNA Surveys to Assess Green Sea Turtle (Chelonia mydas) Presence in Mississippi and Louisiana
… assay should consider passive sampling alongside aerial surveys and statistical modeling.</p>
-
An Evaluation of Waterfowl Production Surveys in Eastern South Dakota, 1995
… attention has been given to the quality of aerial surveys of spring breeding duck populations and water conditions in the prairie pothole region. In contrast, little research time has been done in relation to validating the quality of the July aerial brood surveys which do not have a …
-
Ancient stonewall fish traps on the south coast of South Africa : documentation, current use, ecological effects and management implications
… A total of 43 sets of vywers was located by aerial surveys, 30 of which are only accessible through private land. This affords them some measure of protection, together with five located off reserves, but diminishes their educational and tourism value. Four sets of vywers were mapped in …
-
New insights into the summer distribution of basking sharks (Cetorhinus maximus) in the northeast Atlantic
… on basking sharks was derived from three aerial survey programmes which covered extensive inshore and offshore waters within the northeast Atlantic. The occurrence of basking sharks in the area was highly seasonal, with individuals predominately observed during the summer months …
-
Management of a central Illinois deer herd
… densities by both visual and infrared helicopter surveys. The 600 hectare park had been closed to hunting until 2004 when a total of 730 deer were counted on the entire survey area (the park and the surrounding 2,953 ha). The deer management program (2004-2010) utilized archery and shotgun hunting …
-
Ecology, conservation and management of the black lechwe (Kobus leche smithemani) in the Bangweulu Basin, Zambia
… by an increase in water levels in the swamps. Aerial surveys during the 1950s suggested less than 20000 and by 1970 only 16 000 lechwe were counted from the air. From 1988-1996, ground surveys were undertaken with a four-wheel drive vehicle, on motor bike and on foot. A series of aerial …
Page 1 of 2