Thesis (Ph. D.)--University of Hong Kong, 1994. / Includes bibliographical references (leaves 162-194).

Thesis (M. Phil.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 97-111).

Thesis (M. Sc. (Zoology and Entomology))--Rhodes University, 2006.

By 1980, the United States had lost over 50 percent of its original wetland resources. The U.S. National Wetland Inventory estimates that 95 percent of annual wetland losses since 1955 occurred to palustrine wetlands. The majority of these losses occurred to the three types of palustrine vegetated wetlands: emergent, forested, and shrub. The primary cause for wetland losses from the mid-1950s to the mid-1980s was agricultural conversion supported by federal agricultural policies, especially the Agricultural Conservation Program that provided significant direct and indirect support for wetland conversions. The rate of converting wetland to agriculture has declined since the mid-1950's with a significant decrease occurring between the mid-1970s and mid-1990s. Statistical analysis using correlation, regression and principal component analysis was performed to identify the major contributory factors in loss rates in the Midwest, Lower Mississippi River Valley and the Southeast United States. The variables considered are: Swampbuster provisions of the Food and Security Act of 1985, Conservation Reserve Program enrolled acreage and rental rates, Wetland Reserve Program and The Clean Water Act Section 404 permits; prices of corn, soybeans and wheat; and the percent of wetlands remaining. The results indicated agricultural policies and Clean Water Act Section 404 permits and wetland loss rates were negatively correlated and prices of corn, soybeans and wheat were positively correlated. The percentage of wetlands remaining, were also positively correlated with loss rates. Taken together, the selected agricultural policies, Section 404 permits, commodity prices and percent of wetland remaining, explain 96 percent of the variance in wetland loss rates and 94 percent of the agricultural losses nationally. These results are consistent, with minor variations, across geographic wetland strata and wetland types. Regional differences exist in the major type of wetland losses; emergent wetland losses were more prevalent in the agricultural Midwest, with forested wetland losses concentrated in the Lower Mississippi River Valley and the Southeast United States. The results of this research reflect the intricate relationships between federal legislation, regulatory programs, legal decisions, economic factors, and changes in society's view and understanding of the importance of wetlands and the need to merge conservation programs with agricultural policies. Economic factors exert a significant impact in decision-making of whether to convert or conserve wetland resources. The economic feasibility of installing drainage system to make wetlands farmable depends upon the relationship of capital investment cost and crop prices. Commodity prices impact decisions regarding enrollment into the Conservation Reserve Program and the Wetland Reserve Program; higher commodity prices can make conversion more profitable but low crop prices will make these programs more appealing economically. The Swampbuster provisions are effective in conserving wetlands if the economic penalties are significant to the individual farmer. The policy, legal and commodity variables were used to create models that explain the inter-relationship between agricultural economic factors, policy impacts and commodity prices. The models indicate how the variables could affect decision-making in determining whether to convert or conserve palustrine vegetated wetlands; increased commodity prices coupled with lower conservation program payments could jeopardize wetland conservation efforts and result in increased wetland loss rates due to increased wetland drainage and conversion.

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This study assessed the diets of participants in the Kahnawake Schools Diabetes Prevention Project (KSDPP). Data were gathered from three cross-sectional surveys of students in grades four to six in the Mohawk community of Kahnawake. Single 24-hour recall interviews were conducted in 2002 (n = 151), 1998 (n = 153) and 1994 (n = 164). Mean number of servings of Vegetables and Fruits (3.6 per day), Milk Products (1.6 per day), and Meat and Alternatives (1.5 per day) were found to be below ranges recommended by Canada's Food Guide to Healthy Eating. Correspondingly, mean intakes of fibre, calcium and vitamin D were found to be below Adequate Intake references. Positive changes detected include a decrease in soda consumption and a shift toward whole grains. Results indicate that improved nutrient intakes will require closer adherence to the principles of Canada's Food Guide to Healthy Eating. KSDPP intervention staff are using results as a basis for intervention.