Thesis (M.S.)--Mississippi State University. Department of Biological Sciences, 2006. / Title from Web page (viewed on Sept. 16, 2008). Includes bibliographical references (p. [30-35]).

Originally presented as the author's thesis, Seville. / Includes bibliographical references.

Originally presented as the author's thesis, Seville. / Includes bibliographical references.

Thesis (M.A.)--Rice University, 1976. / Includes bibliographical references (leaves 71-77).

A study of the feasibility of lagoon-intermittent sand filter treatment of dairy wastewaters from the Utah State University dairy was performed from 1978 through 1980. The report also includes an analysis of alternative dairy wastewater treatment systems utilizing a computer model. A simple and inexpensive method of dairy wastewater treatment is needed so that the small (50- 300 cows) dairy farmer can meet the 30 mg/ ~ of BODs federal effluent standard and still earn a profit. The influent to the USU dairy treatment system, the lagoon effluent and the filter effluent were sampled during the summers of 1978 and 1979 for BOD s , suspended solids and volatile suspended solids . The data show t hat removal efficiencies over 90 percent were achieved by the lagoon-intermittent sand filter system, but the effluent BODs and suspended solids concentrations did not meet the federal standards. The high effluent concentrations were a. result of the lagoon being overloaded. The treatment system's construction allowed runoff, groundwater and milking center washwater to enter the lagoon causing greater than expected hydraulic and organic mass loading rates. Despite high influent concentrations the intermittent sand filters consistently removed 80 percent of the suspended solids from the lagoon effluent. If the quality of the lagoon effluent were improved by reducing the organic mass loading rate, the effluent from lagoon intermittent sand filter treatment of dairy wastewaters would meet the federal standards.

Seagrass meadows are a crucial foraging habitat for marine megaherbivores. The Red Sea hosts two megaherbivore species, the green turtle Chelonia mydas and the dugong Dugong dugon, along with twelve seagrass species. Seagrass habitats in the Saudi Arabian coast of the Red Sea are currently under pressure from large scale coastal developments. I used multiple methods to assess seagrass and megaherbivore densities in Al-Wajh lagoon, a unique semi-enclosed bay on the northeastern coast of the Red Sea that is currently targeted for development. Seagrasses were assessed using quadrat surveys while megaherbivores censuses were conducted by both unmanned aerial vehicles (UAV) and boat-based observers. Both seagrass and sea turtles were patchily distributed throughout the bay. Dugongs were never encountered during surveys but feeding trails and off-effort encounters suggest at least occasional use of the area. While there were some qualitative patterns between seagrass composition and feeding trail/sea turtle abundance, there was not enough data to achieve statistical significance. The UAV generally outperformed boat-based surveys, but the inability of the drone to distinguish turtles through dense seagrass coverage is a methodological limitation that should be overcome by using hyperspectral cameras in future work. Overall, my results highlight the importance of ground truthing habitat maps, reveal interesting questions for additional study, and provide some direction for future research and conservation efforts within Al-Wajh Lagoon.

No description available.

Thesis (Ph.D.) -- Dept. of Botany, University of Adelaide, 1993. / Bibliography: leaves 103-120.

Lagoons are coastal waterbodies which are sensitive to meteorological and hydrological changes. This study focused on the spatial distribution of salinity in Gialova lagoon, Greece. The area in which the lagoon is located is under pressure from agriculture and truism in the area. Besides that, the lagoon is an important stop for migratory birds as well as the home for rare species. To investigate how salinity is distributed in the lagoon a salinity gradient was produced. Also, an attempt was made to model the salt and fresh water fluxes in the lagoon using a mass balance approach. The water fluxes are either from fresh water sources or influx of saline water from the sea. Manual electric conductivity measurements were taken during a field campaign to the lagoon. Time series data used in the model was obtained from stations in the lagoon and the surroundings. An investigation in how the lagoon measurement station differ in salinity was also performed in this study. Results from the gradient map and manual measurements show that the water in the lagoon is the freshest in the North-Eastern parts and the most saline to the South-West. The modelled water fluxes show an inverse relationship from each other. High fresh water fluxes correspond to precipitation events, lower salinity concentration. Whereas high salt water fluxes correspond to high salinity concentration and lowered precipitation. The stations concentrated to the middle lagoon show corresponding values in salinity whereas the station to the South-West differs. The canal surrounding the lagoon shows interactions since measurements show that the water is brackish. A longer time series could provide patterns in water fluxes over time. Trying to find the portions of terrestrial groundwater and surface water, and further investigation of the regional aquifer could provide new information to develop this model. The region is expected to experience water stress which makes further studies and monitoring important.

In estuaries, like the Indian River Lagoon, mesozooplankton have a vital role in the food web by connecting trophic levels. In this study, mesozooplankton abundance and species composition were monitored weekly on the incoming and outgoing tides from September 2006 to May 2009. For the incoming tide, the mean abundance was 2298.2 mesozooplankton/m3 (+/-325.2), and for the outgoing tide the mean abundance was 1180.0 mesozooplankton/m3 (+/-153.1). The mesozooplankton abundance on the incoming tide was significantly greater than on the outgoing tide. The most abundant type of mesozooplankton was the copepod Acartia tonsa, representing 35.0% and 52.1% of the individuals on the incoming and outgoing tides respectively. Mesozooplankton abundance values were compared with environmental data obtained from the South Florida Water Management District. The strongest positive correlation was found between chlorophyll a concentrations and A. tonsa abundance, likely due to phytoplankton being the primary food source for A. tonsa. / by Miranda Hoover Kerr. / Thesis (M.S.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.