Thesis (M. Phil.)--University of Hong Kong, 1998. / Includes bibliographical references (leaves 53-56).

Thesis (M.Phil.)--City University of Hong Kong, 2005. / "Submitted to Department of Biology and Chemistry in partial fulfillment of the requirements for the degree of Master of Philosophy" Includes bibliographical references (leaves 153-181)

Thesis (Ph. D.)--University of Wisconsin--Madison, 1972. / Typescript. Vita. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1976. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 78-81).

Thesis--Wisconsin. / Includes bibliographical references (leaves 230-243).

Thesis (doctoral)--Landbouwuniversiteit te Wageningen, 1988. / English and Dutch. Includes vita. Includes bibliographical references.

Thesis (M.S.)--Baylor University, 2006. / Includes bibliographical references (p. 134-141).

A comparison was made of the responses of benthic and planktonic components of natural water-sediment systems enriched with inorganic fertilizers. Three levels of fertilization were applied to a series of enclosures placed in a shallow (1 m depth) area of Marion Lake, British Columbia and community respiration, primary production, standing algal crop and the distribution of added phosphorus were measured in both the sediment and the water column over a period of two years. A loss of added phosphorus from the water column corresponded to an increase measured in the sediment. Uptake and release of phosphorus by the sediment was proportional to its concentration in the water column, indicating a water-sediment equilibrium. In an undisturbed system, however, there was a net movement of phosphorus into the sediment . A sustained high level of planktonic primary production persisted throughout the period of fertilization. However, an initial increase in total benthic primary production returned to pre-fertilization levels following the establishment of an increased standing crop of epipelic algae. At this point, benthic primary production appeared to be a function of grazing pressure, responding to increased grazing but not to additional fertilization. When grazing was experimentally increased by concentrating grazers in an experimental area, benthic primary production increased. Fertilized sediment appeared to have a much greater ability to withstand increased grazing pressure than normal sediment, maintaining high levels of primary production even at five times normal grazer density. But despite this potential, measurements of grazer and bacteria populations within the experimental enclosures showed no response to the greater standing crop of epipelic algae. As a result, sustained increase in benthic primary production could be induced only experiment-, ally. It was concluded that the benthic community was more stable in its response to enrichment than that of the plankton and by absorbing nutrients from the water column served to dampen the effects of the more pronounced fluctuations of the planktonic community. / Science, Faculty of / Zoology, Department of / Graduate

This report constitutes the Master of Science thesis of the same title completed by the author in May, 1973, and accepted by the Department of Systems and Industrial Engineering. It is the result of a joint research project on "Decision analysis of watershed management alternatives," supported in part by the United States Department of the Interior, Office of Water Resources Research, as authorized under the Water Resources Research Act of 1964. / Various approaches to modeling phytoplanktonzooplankton- nutrient interactions have been investigated. A stochastic birth- death model was developed to describe changes in phytoplankton and zooplankton population levels at a given point. Tuie stochastic birth -death model was combined with a deterministic mass balance of limiting nutrient concentration to form an over -all system theoretic model that enables one to use Monte Carlo simulation to study the problem of eutrophication. A comparison made between this modeling approach and the standard differential equation approach suggested that further investigation was desirable, particularly in the area of model calibration.

The purpose of this paper is to detail the distribution and quantity of soluble phosphates in an activated sludge plant, its discharge creek, and receiving reservoir. The resultant analyses and comparison of data should provide some better understanding of the fate of phosphorus in a Southwestern waterway system.