Politics at the water's edge: The presidency, Congress, and the North Korea policy of the United States

For all their efforts to avoid a nuclear North Korea, the Clinton and Bush administrations failed to achieve this goal, the most important policy objective of the United States in its relations with North Korea for decades, mainly because of inconsistencies in U.S. policy. This dissertation seeks to explain why both administrations ultimately failed to prevent North Korea from going nuclear. It finds the origins of this failure in the implementation of different U.S. policy options toward North Korea during the Clinton and Bush administrations. To explain the lack of policy consistency, the dissertation investigates how the relations between the executive and the legislative branches and, more specifically, different government types—unified government and divided government—have affected U.S. policy toward North Korea. It particularly emphasizes the role of Congress and partisan politics in the making of U.S. policy toward North Korea. This study finds that divided government played a pivotal role. Partisan politics are also central to the explanation: politics did not stop at the water’s edge. A divided U.S. government produced more status quo policies toward North Korea than a unified U.S. government, while a unified government produced more active policies than a divided government. Moreover, a unified government with a Republican President produced more aggressive policies toward North Korea, whereas a unified government with a Democratic President produced more conciliatory policies. This study concludes that the different government types and intensified partisan politics were the main causes of the inconsistencies in the United States’ North Korea policy that led to a nuclear North Korea.

Shifting N and P limitation along a north-south gradient of mangrove estuaries in South Florida

A multivariate statistical analysis was applied to a 10 year, multiparameter data set in an effort to describe the spatial dependence and inherent variation of water quality patterns in the mangrove estuaries of Ten Thousand Islands – Whitewater Bay area. Principal component analysis (PCA) of 16 water quality parameters collected monthly resulted in five groupings, which explained 72.5% of the variance of the original variables. The “Organic” component (PCI) was composed of alkaline phosphatase activity, total organic nitrogen, and total organic carbon; the “Dissolved Inorganic N” component (PCII) contained NO 3 − , NO 2 − , and NH 4 + ; the “Phytoplankton” component (PCIII) was made up of total phosphorus, chlorophyll a, and turbidity; dissolved oxygen and temperature were inversely related (PCIV); and salinity and soluble reactive phosphorus made up PCV. A cluster analysis of the mean and SD of PC scores resulted in the spatial aggregation of the 47 fixed stations into six classes having similar water quality, which we defined as: Mangrove Rivers, Whitewater Bay, Gulf Islands, Coot Bay, Blackwater River, and Inland Waterway. Marked differences in physical, chemical, and biological characteristics among classes were illustrated by this technique. Comparison of medians and variability of parameters among classes allowed large scale generalizations as to underlying differences in water quality in these regions. A strong south to north gradient in estuaries from high N - low P to low N - high P was ascribed to marked differences in landuse, freshwater input, geomorphology, and sedimentary geology along this tract. The ecological significance of this gradient discussed along with potential effects of future restoration plans.