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.
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Showing 1 to 20 of 39 for “"Point counts"”.
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Evaluating the use of acoustic monitoring for surveying tropical birds
… communities and species relative to traditional point count surveys. To address this goal, I compared species richness, composition and detection probability of 20 species between SRS and point counts across six tropical habitats in the northeastern Yucatan Peninsula. SRS performed in a similar …
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A Comparison of Wildlife Monitoring Techniques in Riparian Ecosystems of the Western United States
… fecal DNA surveying, circular plot point counts, mist-net transects and bird-banding, transect counts, and nest monitoring. The main objectives of wildlife monitoring include gaining data in species presence, absence and distribution, relative population abundance, and factors that …
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Passerine Use of Grasslands Managed With Two Grazing Regimes on the Missouri Coteau in North Dakota
… during 1996-1997 using 122 fixed, 100 m radius, point counts. Relative abundance was assessed by recording singing males or breeding pairs heard or seen during each count. Twenty-five grassland species were recorded in 1995, 30 in 1996 and 29 in 1997. Grasshopper sparrows, brown-headed cowbirds, …
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The effect of urbanization on the stopover ecology of neotropical migrant songbirds
I conducted spring migration point counts and vegetation surveys at 29 forest patches in the Chicago, IL metropolitan area in 2012 and 2013. The forest patch selection was designed to test the effects of patch size, distance from the Lake Michigan shoreline and degree of urbanization. I conducted …
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Bird and Bat Diversity and Abundance in Agroecosystems in Relation to Drainage Hedgerow and Landscape Structure
… hedgerows by providing more habitat. I used point counts of forest and shrub-edge-associated birds and ultrasonic recordings of bats along drainage hedgerows in eastern Ontario to test my hypotheses. Overall, I found that drainage hedgerow height was positively associated with higher …
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Vocalizations influence roost-site selection in overwintering cavity-nesting birds in Eastern Washington
… units. At each station, I conducted an 8-minute point count prior to sunset. Following the initial point count, I conducted a second point count with 1 of 3 broadcast treatments: 1) no call 2) alarm call and 3) contact call. I compared the number of cavity-nesting birds observed and mean …
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Influence of Human Recreational Activities and Vegetative Characteristics on Waterbird Abundance
… human disturbance was estimated by conducting point counts for 20 minutes at 30 randomly determined locations along the San Marcos River. Measurement of riparian characteristics at representative transects along the San Marcos River system were conducted to examine correlations between certain …
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Species richness and composition of avifaunal communities in a complex Amazonian landscape
… repeated during high water. Using ten 15-minute point counts every 200m for each site a total of 284 species were recorded. Species richness in seasonally flooded forest was found to be similar but was significantly lower in terra firme. Almost 17 percent of species were significantly associated …
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Street-wise : does prey abundance buffer black sparrowhawks (Accipiter melanoleucus) from the negative health impacts of urbanisation?
… (Heterophil/Lymphocyte ratio in white blood cell counts), body condition (based on morphometric measurements) and blood parasite infection (presence and abundance of Haemoproteus and Leucocytozoon). Trends in diet composition along a gradient of urban cover were determined through the analysis of …
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Modeling Detection and Density Using Distance Sampling for Three Priority Grassland Bird Species in Texas - Northern Bobwhite (Colinus virginianus), Eastern Meadowlark (Sturnella magna), and Painted Bunting (Passerina ciris)
… for these species using data collected from 986 points across 11 Texas counties. Points were visited once per year from 2013 to 2017 in May and June, and 5-minute point counts were performed using distance sampling protocols. Models were fit using gdistsamp from the package “unmarked” in R. …
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Patterns of Seasonal Variation in Diet, Abundance, and Movement of the Scarlet Macaw (Ara macao) in southern Belize
… compare fruit abundance with macaw sightings in point counts on the plots and nearby. My point count data and historical sightings indicate strongly seasonal patterns of macaw movement between the low eastern foothills of the Maya Mountains, notably at Red Bank Village, and the higher Chiquibul …
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Habitat Relationships of Breeding Birds in Bottomland Hardwood Forests of the Altamaha River, Georgia
… River, Georgia. In 2007 and 2008, I conducted point-counts for breeding birds and quantified habitat characteristics at 54 stations. I detected 33 species of birds breeding at stations, 19 of which were Neotropical Migratory bird species. I found that the overall density of breeding birds, the …
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Impacts of elk management and riparian condition on songbirds in Rocky Mountain National Park
… riparian ecosystems from heavy browsing. Using point counts, I evaluated the effect of elk exclosures and riparian shrub condition on songbird density and occupancy. I found little support for a direct effect of elk exclosures on bird communities, with the exception of shrub nesting birds which …
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Influence Of Landscape Spatial Patterns And Land Use Planning On Grassland Bird Habitat Occupancy In Chester County, Pennsylvania
… occurrence. This dissertation uses fixed-radius point counts of six focal bird species on agricultural land in Chester County to evaluate the influence of landscape spatial patterns and land use planning outcomes on grassland bird habitat occupancy. Separate habitat models are generated for the …
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Avian ecology and rapid morphological change in a novel plant-frugivore system
… behavior to their morphology. Lastly, I used point counts conducted across the island to describe the spatial heterogeneity of the bird community and then related that heterogeneity and species’ abundances to habitat and environmental variables. I found that on the Hawaiian Island of Oʻahu, …
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The influence of a changing environment on the breeding biology and diet of Kelp Gulls (Larus dominicanus vetula) in Plettenberg Bay, South Africa
… count for this area. A combination of direct counts and the trial use of an unmanned aerial vehicle (UAV),were used as methods of counting nests. The direct monitoring of nests allowed for the effect of different microhabitats on the breeding performance of Kelp Gulls to be investigated, which …
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Thermal and Diagenetic Evolution of Carboniferous Sandstones, Central Appalachian Basin
… multivariate data set compiled from point counts served as the basis for quantitative analysis of controls on sandstone diagenesis such as framework grain composition, paleoclimate and depositional environment. A priori groups (independent variables) corresponding to the controls were …
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HABITAT USE AND THE EFFECTS OF DISTURBANCE ON WINTERING BIRDS USING RIPARIAN HABITATS IN SONORA, MEXICO
… wintering in Sonora, data from 1,816 standard point counts were collected from 87 locations during January and February 2004-2006. A total of 253 species were detected across 14 vegetation types, including nine categories of riparian vegetation. The mean number of species and individuals …
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HABITAT USE AND THE EFFECTS OF DISTURBANCE ON WINTERING BIRDS USING RIPARIAN HABITATS IN SONORA, MEXICO
… wintering in Sonora, data from 1,816 standard point counts were collected from 87 locations during January and February 2004-2006. A total of 253 species were detected across 14 vegetation types, including nine categories of riparian vegetation. The mean number of species and individuals …
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Modeling the spatial and temporal dynamics of coastal marsh birds
… a two year radio telemetry study, and conducted point count surveys of marsh birds from March to mid-June of 2009-2011 using call-back methods to elicit responses. I visited each point six times per year, and >100 points were surveyed each year (n=304). Localized, field-based measures (e.g. water …
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