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 152 for “"Range Size"”.
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Increased phenotypic plasticity linked to broader geographic range size in sunflower (Helianthus) species
… species representing different geographic ranges. Locally restricted H. longifolius and H. verticillatus showed less plasticity in growth and allocation traits than widespread H. angustifolius and H. maximiliani. Rare species with narrower ranges also displayed less population-level …
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The relationship between niche breadth and geographic range size in African Horseshoe bats (Rhinolophidae, Chiroptera)
… conditions resulting in large geographic range sizes. Conversely, specialists have low niche breadth and small range sizes. I tested this hypothesis using African Horseshoe bats to determine if differences in niche breadth can explain variation in geographic range size.
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Relationship of Ruffed Grouse Home Range Size and Movement to Landscape Characteristics in Southwestern Virginia
… on ruffed grouse (Bonasa umbellus) home range size and movement, and examined grouse selection for specific landscape characteristics and cover types. Grouse home ranges and movement patterns derived from telemetry data gathered from fall 1996 through fall 1998 were overlaid onto a GIS …
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Climatic specialisation: an explanation for the range size and distribution of bryophytes on a tropical island elevational gradient
… and insolation, which restrict their geographic range. However, little is known about the mechanisms that connect bryophytes with climatic factors. In this thesis I test the idea of ecophysiological specialisation using reciprocal transplant experiments, along with direct laboratory measurements …
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The Tortoise and the Landscape: Examining the Habitat, Daily Movement, Home Range Size, and Thermal Ecology of the Texas Tortoise (Gopherus berlandieri)
… berlandieri). Within its limited geographic range in southern Texas and northern Mexico, G. berlandieri occurs across a variety of environments (i.e., vegetation types) and environmental gradients, but prior research has been unable to identify a set of precise habitat requirements. Despite …
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Movements and home range size of bald eagles from Glacier Bay National Park and Preserve, Alaska: with an analysis of satellite telemetry
During 1991-1993, I studied movements of 23 adult and 7, 8-10 week old nestling bald eagles captured in Glacier Bay National Park and Preserve, Alaska. I estimated locations by homing and satellite telemetry. During the breeding season, the distances adult eagles moved from successful, …
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Effects of Testosterone on the Spatial Ecology, Coloration, and Brain Regions in Western Fence Lizards, Sceloporus occidentalis
… as food, mates, and escape from predators. Home range size, or the total area an organism inhabits, varies in relation to numerous factors including seasonality. During the breeding season, home range size increases in males across taxa. In addition, males usually also have larger home range …
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Wild Turkey Ecology in Two Intensively Farmed Landscapes in Central Illinois
… between seasonal activity centers and annual range size averaged 712.4 ha. Fall/winter ranges averaged 701.4 ha (SE = 102.3, n = 71) and were larger and more variable than nesting season ranges which averaged 404.0 ha (SE = 36.7, n = 93). Upland forest was preferred during all seasons and at …
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Spatial ecology of the smooth softshell turtle (Apalone mutica) in the Kaskaskia River of Illinois
… of space use including movement rates, home range size, and habitat preference. Spatial ecological information is lacking for many river turtles including the Smooth Softshell Turtle (Apalone mutica), a species inhabiting the Midwestern United States. I investigated the spatial ecology of A. …
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Home range and movement of the eastern box turtle (Terrapene carolina) in East Central Illinois
… Radio-telemetry was used to study the home range size, movement, habitat use, and nesting of Terrapene carolina. Minimum Convex Polygons (MCP) and Kernel Density Estimates at 95, 75, and 50% were used to measure home range size. Mean home range size was 7.4 ha (MCP) and 5.3 ha (95% Kernel). …
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Assessing Habitat Quality for the Endangered Red-cockaded Woodpcker
… relationships between fitness, habitat use, home range size, and habitat characteristics described in the guidelines. I assumed that habitat characteristics that confer quality were related to higher fitness, greater habitat use, and reduced home range size. To a large extent, the guidelines are …
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Environmental driver effects on population growth rates vary by rarity type and variation in demographic rate sensitivity
… effects could vary by population or rarity type (range size, habitat specificity, and population density). I examined how the effects of drivers on vital rates could impact population growth due to variation of population growth sensitivity to demographic rates. I found significant variation in …
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The spatial ecology of the Eastern box turtle (Terrapene carolina carolina) in a fragmented landscape in Southeast Tennessee, Hamilton County
The landscape throughout the range of the Eastern Box turtle (Terrapene carolina carolina) has been altered significantly since the late 1880s by habitat fragmentation. In this study, the spatial ecology and seasonal movement patterns of the Eastern Box turtle in contrasting habitat types are …
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Biogeographical patterns of southern African marine invertebrates
… effective evolutionary time, niche breadth, range size and area of occupancy. Evidence exists that both supports and negates most of these mechanisms. In addition to the richness gradient, a latitudinal gradient in geographical range size exists, whereby species range sizes decrease with …
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Spatial Ecology of the Spotted Salamander <em>Ambystoma maculatum</em> During the Nonbreeding Season.
… distribution patterns over 2 years. The home range size of 10 Spotted Salamanders was calculated using the revised minimum area method. A clumped distribution was found at larger spatial scales, except in the first year of the study. Home range size was shown to be limited and highly variable …
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Seasonal Movements, Habitat Use Patterns and the Effects of Human Disturbances on Elk in Custer State Park, South Dakota
… sub-herds and five bull sub-herds. Annual home ranges of these herds overlapped a mean of 18% (Range = 9-29%, SE = 3.2, n = 5) for cows and 27% (Range = 11-42%, SE = 5.8, n = 6) for bulls. Home range sizes of CSP elk varied with method of analysis, season, and sex. Mean 95% harmonic mean annual …
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The Spatial Ecology of Wild Pigs (Sus scrofa) in Southwest Florida
… invasive species, and mitigating farther range expansion will require a thorough understanding of movement behavior, diel activity patterns, space use, and resource selection. Currently, limited empirical evidence is available on the ecology of wild pigs in Southwest Florida. Therefore, I …
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Cheetah of the Serengeti Plains: A home range analysis
… areas in an historically reduced geographic range. Home range, a useful trait for threat assessment, species reintroduction, and population estimation, is plastic in cheetah with sizes ranging from 40 km2 to over 1000 km2 depending on location. Previous home range estimates for cheetah used …
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