Source: Dissertation Abstracts International, Volume: 41-07, Section: B, page: 2440. / Thesis (Ph.D.)--The Florida State University, 1980.

Source: Dissertation Abstracts International, Volume: 40-10, Section: B, page: 4602. / Thesis (Ph.D.)--The Florida State University, 1979.

A mixed-layer model of springtime phytoplankton dynamics was used to simulate spring phytoplankton blooms on the Bering Sea shelf, on the northern Mid-Atlantic Bight shelf, and over the entire Mid-Atlantic Bight. Convective mixing of the water column, caused by atmospheric cooling of the surface waters, was important in determining the timing of the spring phytoplankton bloom in all model domains. In the Bering Sea during 1980 and 1981, the spring bloom did not occur in the first period of low wind speed, but rather occurred in the first period of low wind speed following the cessation of convective mixing. However, interannual differences between the 1980 and 1981 phytoplankton blooms indicate that winds have significant effects on phytoplankton dynamics. Small differences in the magnitude and variability of wind speed can significantly affect the strength and character of the phytoplankton bloom. In the northern Mid-Atlantic Bight simulation, net phytoplankton growth occurred only in the absence of deep convective mixing. Upon the initiation of vernal atmospheric warming and the cessation of deep convective mixing, the major spring bloom occurred on the northern Mid-Atlantic Bight shelf in 1984. When run as an N $\times$ 1-D model over the entire Mid-Atlantic Bight, the model simulated the general features of the 1979 Mid-Atlantic Bight spring phytoplankton bloom seen in a series of CZCS images. In the Mid-Atlantic Bight model, convective mixing controlled the timing of the spring bloom and, through spatial variations in convective overturning of the water column, the spatial distribution of the bloom. / Source: Dissertation Abstracts International, Volume: 51-12, Section: B, page: 5743. / Major Professor: Richard L. Iverson. / Thesis (Ph.D.)--The Florida State University, 1990.

As part of the Processes and Resources of the Bering Sea Shelf (PROBES) program, a vertical time dependent phytoplankton-zooplankton model was developed for application to the middle and outer shelf domains of the Southeast Bering Sea Shelf. The model included two phytoplankton groups and four zooplankton groups. Use of two phytoplankton groups allowed the inclusion of phytoplankton with different uptake rates, nutrient requirements, sinking rates, and grazing pressures. All four zooplankton groups grazed phytoplankton and one group could also graze detritus or smaller zooplankton. Two zooplankton groups could produce eggs that developed through naupliar and copepodite stages during the simulation period. In response to low rations, zooplankton were able to vertically migrate in the water column. / Simulations of the middle and outer domains for an eighty day period were completed for 1980 and 1981 and compared to PROBES field observations. The model successfully simulated the spring algal bloom and the growth and reproduction of multiple zooplankton groups. The model demonstrated that zooplankton species on the middle shelf had little impact on the phytoplankton species composition. Approximately sixty-five percent of the nitrate nitrogen loss over the water column on the middle shelf reached the benthos as algal biomass. This supported a benthic community on the middle shelf. Zooplankton grazing pressure on the outer shelf was an order of magnitude greater than on the middle shelf and led to a phytoplankton species composition shift from a diatom to a Phaeocystis poucheti community. Between thirty-nine and sixty-nine percent of the nitrate nitrogen loss over the water column went to the zooplankton compartment. This supported a pelagic community on the outer shelf dominated by walleye pollock. / Model calculations of new production to total production (f ratio) indicated rapid responses to wind mixing events. The f ratios suggested that ammonium could be important in sustaining production during the summer on the middle shelf. / Source: Dissertation Abstracts International, Volume: 51-04, Section: B, page: 1594. / Major Professor: Richard L. Iverson. / Thesis (Ph.D.)--The Florida State University, 1990.

Several groups of siliceous microorganisms possess a skeletal latticework of interconnected rods. Skeletal configurations of one of these groups, the silicoflagellates, can be produced by a simple mathematical model, in which the apical surface area is minimized for given basal area and internal volume. A similar model in which the total length of the skeletal elements, and thus the silica utilization, is minimized produces configurations that are generally less common in silicoflagellates, suggesting that the minimization of apical surface area is very important to the silicoflagellate organism. / The diversity of silicoflagellate skeletal morphologies suggests that both the minimization of apical surface area and the conservation of skeletal material are important factors in silicoflagellate skeletal morphology. The two most important morphologies found in modern oceans, the four-sided Dictyocha and the six-sided Distephanus can co-occur in an environment where both the minimization of apical surface area and silica utilization have some relative importance. However, these models do not explain the range of variability found in silicoflagellate skeletons, indicating that other factors must also be important. / Source: Dissertation Abstracts International, Volume: 49-07, Section: B, page: 2453. / Major Professor: Sherwood Willing Wise, Jr. / Thesis (Ph.D.)--The Florida State University, 1988.

Source: Dissertation Abstracts International, Volume: 32-11, Section: B, page: 6543. / Thesis (Ph.D.)--The Florida State University, 1971.

Source: Dissertation Abstracts International, Volume: 32-11, Section: B, page: 6545. / Thesis (Ph.D.)--The Florida State University, 1971.

Source: Dissertation Abstracts International, Volume: 32-11, Section: B, page: 6545. / Thesis (Ph.D.)--The Florida State University, 1971.

Source: Dissertation Abstracts International, Volume: 36-01, Section: B, page: 0040. / Thesis (Ph.D.)--The Florida State University, 1975.

Source: Dissertation Abstracts International, Volume: 37-12, Section: B, page: 5921. / Thesis (Ph.D.)--The Florida State University, 1976.