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 64 for “"Agriculture, Forestry and Wildlife"”.
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Investigations of White -Tailed Deer Infestation by Ixodes Scapularis on the Illinois River, USA
… The results demonstrated that deer are clustered and their distribution is best explained by riverine forest cover. Bivariate and nearest-neighbor spatial analyses indicated that infested deer were more clustered than uninfested deer. Local spatial analyses identified the locations of high and low …
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The Influence of Fluvial Geomorphic Processes on Spatial Patterns of Forest Primary Succession
… bends of the Bogue Chitto River, Louisiana, USA and on nine additional rivers in the southeastern US. I hypothesized that geomorphic processes associated with river planform cause patterns of tree species to vary predictably along point bars as well as with increasing age of land during forest …
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The Impact of Neighborhood-Based Processes on Demography and a Decline in Species Diversity in a Temperate Deciduous Forest
Understanding the maintenance of species diversity is a central question in community ecology. Ecological processes explaining the maintenance of species diversity, including density-dependence, interspecific competition, and disturbance, should be able to elucidate not only the causes of the …
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Water Relations of Ponderosa Pine in Contrasting Environments: Implications for Global Climate Change
… CO2 is expected to force a rise in temperature and atmospheric vapor pressure deficit (VPD) by the end of the 21st century. For trees, the most relevant allometric component controlling water transport is the ratio of biomass allocated to leaves versus sapwood (AL/AS). Within Pinus, trees …
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Studies on Species of the Aphid Genus Cinara on Pinus Edulis and Pinus Monophylla
… feed exclusively on conifers of the Cupressaceae and Pinaceae. They are speciose and particularly diverse in North America. Their phylogenetics is completely unknown and they historically have been treated based on the taxonomy of their hosts. They are also known to specialize on particular woody …
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Ecology and Conservation of Birds of Pinyon -Juniper Woodlands
… over several million ha of pinyon juniper woodlands. On 15 study sites in Arizona and Utah, I found no evidence that any bird species had declined in response to pine mortality between 2001 and 2005. In 2004, during the drought, and 2005, a wet year, I studied avian nesting success on study …
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Habitat Use and Thermal Ecology of Ratsnakes (Elaphe Obsoleta) and Racers (Coluber Constrictor) in Illinois
… ectotherms through selective timing of activity and habitat use involves costs, as well as the benefit of improved physiological function from maintaining optimal body temperatures. Under the cost-benefit model, reptiles should thermoregulate carefully only when the benefits outweigh the costs. I …
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The Effect of Habitat Fragmentation on Forest Mammals: An Experimental Analysis of Three Squirrel Distributions in the Agricultural Landscape of East Central Illinois
… patterns of tree squirrels in the agricultural landscape of eastern Illinois. I surveyed mammalian species richness in 10 forest remnants and found that 7 of 16 species were present in all sites, with as many as 13 of the 16 species probably occurring within all sites on occasion. The southern …
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Designing Contiguous and Minimally Fragmented Nature Conservation Reserve Networks
… spatial criteria, namely reserve contiguity and minimal fragmentation, using graph theoretic approaches and linear integer programming. The optimization methods presented in those studies are modified to improve computational efficiency of the solution procedure, which may be particularly …
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An Economic Analysis of Tropical Timber Concessions
… specifications. More empirical data collection and analyses could be carried out. The different assumptions about enforceability and the validity of the theoretical results obtained can be tested empirically. It would also be informative to study the role of reputation such as a review strategy …
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Conservation of Grassland Birds in an Agricultural Landscape: The Importance of Habitat Availability and Demography
… study suggest that the creation of small grassland complexes within an agricultural matrix is an effective conservation strategy. Furthermore, the results underscore the importance of understanding how life history traits influence population demography and emphasize the importance of …
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Nesting Ecology of Grassland Birds in an Agricultural Landscape
Agriculture is an appropriate landscape context for grassland reserves. I found agricultural edges do not influence nest predation, reserves in agricultural settings support successful nesting throughout breeding seasons, and cropland is an important foraging habitat for birds provisioning …
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Ecology and Management of Overabundant White -Tailed Deer From Suburban Chicago, Illinois
… our knowledge about suburban deer life histories and population dynamics and, thereby provide information essential for the management of overabundant deer.
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Social Organization, Natal Dispersal, Survival, and Cause -Specific Mortality of Red Foxes in Agricultural and Urban Areas of East-Central Illinois
Survival was influenced the most by environmental and body condition. Adult foxes with low (0--20%) and high (80--100%) row-crop percentages, and higher capture weights experienced higher survival. Juveniles from larger litters, low capture body fat, and fewer dispersal days had higher survival. …
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Ethnicity and Natural Resource Use in the Western Tarai Region of Nepal
Tharu and Pahari farmers were similar on 10--11 of 25 natural resource use parameters. On the 14--15 parameters on which the two ethnic groups did differ, 4 differences were due to geographical factors, and 3--4 were due to historical factors. Of the 5--6 differences rooted in culture, 3--4 …
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Effects of Experimental Flooding Regimes on the Seasonal Carbon and Nitrogen Budgets of Silver Maple (Acer Saccharinum) and Speckled Alder (Alnus Incana Ssp. Rugosa)
… of natural flooding regimes can expose wetlands to soil waterlogging during any part of the growing season. Carbon and nitrogen budgets of dominant riparian woody species may be seriously impacted when flooding occurs after the normal spring flood period. To better understand this process, I …
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Establishing Monetary Valuation Methods for Forested Riparian Wetlands in the Continental United States
… were designed for federally subsidizing this land use conversion, and more than half of these ecosystems were indeed destroyed with no realization of the value being lost. In recent years several scientists have sought to define the value of these systems, but this valuation has been elusive. …
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A Gis-Based Habitat Model Predicting Elk Nutritional Condition in the Pacific Northwest
… although specific causes are unknown. Nutrition and summer-autumn body condition (percent body fat) have been linked to virtually every aspect of successful ungulate reproduction and productivity; however, many existing habitat evaluations discount the role of nutrition and are unlikely to detect …
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Ecology of the Eastern Massasauga (Sistrurus Catenatus Catenatus) From Carlyle Lake, Clinton County, Illinois
Detailed studies of the life history and ecology of an organism are important in assessing range-wide variation within species. Additionally because of global declines in biodiversity, knowledge of an organism's life history and ecology become central to developing conservation and management …
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The Role of Temperature in Habitat Selection by Eastern Massasauga Rattlesnakes (Sistrurus Catenatus Catenatus) Near Their Northern Range Limit
… processes depend on body temperature and body temperatures depend primarily on the habitats they occupy. The importance of temperature in habitat selection should be amplified in cool climates and for ambush predators, who must select habitat warm enough to detect and strike prey …
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