Thesis (Ph. D.)--Columbia University, 1916. / Vita. Pub. also as Studies in history, economics and public law, ed. by the Faculty of political science of Columbia university, vol. LXXI, no. 1; whole no. 167. Bibliography: p. 464-476.

Thesis (M.S.)--University of Wisconsin--Madison, 1960. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 99-100).

Thesis (M.S.)--University of Missouri, School of Mines and Metallurgy, 1932. / Several photographs were missing from the document when it was electronically scanned in 2009. The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed June 2, 2010) Includes bibliographical references (p. 76-94).

acase@tulane.edu / Ecogeomorphology is the study of interactions and feedbacks between the physical surface processes and biological communities in an ecosystem. These interactions are under-studied in wetlands associated with river deltas, and are of vital importance to the deteriorating wetlands of South Louisiana. As the state of Louisiana implements its Comprehensive Master Plan for a Sustainable Coast, which relies heavily on diverting Mississippi River water in order to create new wetlands, a detailed understanding of ecogeomorphological relationships is required to create accurate predictive models to design and assess future projects. This research is comprised of three studies of such relationships in the West Bay Sediment Diversion near Venice, LA, and has resulted in the following key findings: 1) the composition of the buried seed bank suggests a shift from river-derived to within-system propagules as the marsh develops, 2) emergent plant roots increase the cohesion of marsh soils, especially when grasses, sedges, and woody species dominate the vegetation, and 3) a competition experiment between the native sedge Schoenoplectus deltarum and the invasive grass Phragmites australis indicated that the two species performed approximately equally in mixture, regardless of abiotic stressors, while the stressors did affect productivity of each species grown in monoculture. These three studies are unified by the role of wetland vegetation as an increasingly important autogenic modifier of other wetland processes during the early development of the marsh. / 1 / Alexander D Ameen

Originally submitted as a doctoral dissertation at the University of Michigan. / "This book is one of a series from the Western Pennsylvania Historical Survey sponsored jointly by The Buhl Foundation, the Historical Society of Western Pennsylvania, and the University of Pittsburgh." Bibliography: p. 237-252.

Thesis (Ph. D.)--Washington University, 1908. / Cover title. Offprint: Annual report of the Missouri Botanical Garden, 19th.

Originally submitted as a doctoral dissertation at the University of Michigan. / "This book is one of a series from the Western Pennsylvania Historical Survey sponsored jointly by The Buhl Foundation, the Historical Society of Western Pennsylvania, and the University of Pittsburgh." Bibliography: p. 237-252.

Originally submitted as a doctoral dissertation at the University of Michigan. / "This book is one of a series from the Western Pennsylvania Historical Survey sponsored jointly by The Buhl Foundation, the Historical Society of Western Pennsylvania, and the University of Pittsburgh." Includes bibliographical references (p. 237-252). Also available in print ed.

Thesis (Ph. D.)--Washington University, 1908. / Cover title. Offprint: Annual report of the Missouri Botanical Garden, 19th.

1 examined the temporal and spatial distribution of total ammonia nitrogen (TAN) and un-ionized ammonia (NH,) in sediment pore water and compared the temporal and spatial patterns of TAN and NH, in overlying surface water with those in pore water, to determine if they were reaching concentrations known to be deleterious to fingernail clams. Pore water was obtained by core extraction and subsequent centrifugation. TAN and NI-I3 in pore water were measured from May through December 1994, at ninety two sites in pool 8, upper Mississippi River, to a depth of five centimeters below the sediment-water interface. TAN and NH3 in pore water were significantly different among sampling dates; with the greatest concentrations occurring in the summer months. Tan and N1-I3 in pore water was significantly greater in impounded open water and backwater side channel habitats and least in main channel border habitat. Tan and NH3 in surface water were significantly less than those in pore water from all of the habitats studied. Analysis of sediment substrate physical features, found that fingernail clam density and occupance were correlated to texture, with fingernail clams preferring silt loam and loam textures. Analysis of the data determined fingernail clams have a preference for particular water depths. It was found that a positive correlation exists between the occurrence and abundance of may flies and fingernail clams. Additionally, this study found a positive correlation between the density of dead fingernail clams (as per empty shells) and the abundance of live fingernail clams. Sites that contained a mean NI-I, concentration below 36 ug/L possessed the largest numbers of fingernail clams. When the mean un-ionized ammonia was above 36 ug/l, fingernail clam density declined precipitously-- 36 ug/L NH3 is the concentration demonstrated to inhibit growth of fingernail clams in laboratory studies. Mean concentrations of NH, in pore water at sites containing fingernail clams was 40 ug/L and ranged from 3 to 100 ug/L. At sites where fingernail clams were nonexistent, NH3 ranged from 3 to 375 ug/L with a mean of 57 ugfL. Mean un-ionized ammonia concentrations at sites containing fingernail clams were significantly different from and consistently lower than sites without fingernail clams. / Department of Natural Resources and Environmental Management