Zooplankton abundance, hydrilla biomass, and physicochemical parameters were sampled for one year in a small central Florida lake. Annually, rotifers comprised most of the species collected and were the most abundant zooplankton group. Hydrilla biomass was lowest during winter and spring while orthophosphate and phtoplankton concentrations were highest. Zooplankton densities were highest when hydrilla biomass was low. Small-bodied limnetic herbivores comprised most of the zooplankton during the spring. Zooplanton abundances were lowest during summer and fall and may have been either directly or indirectly related to the hydrilla growth. Factors, such as lower phytoplankton and dissolved oxygen concentrations, possible increased predation by fish, and substances that may have been secreted by the hydrilla may have had a negative effect on the lake's zooplankton density. Littoral zooplankton species were frequently collected from the lake when hydrilla biomass was high. Species diversity (─æ) was lowest during winter and spring and ranged from 1.69 to 2.11; species diversity peaked during the summer reaching 3.04.

Megginnis Arm of Lake Jackson in Tallahassee, Florida, has experienced rapid eutrophication as a result of development within the contributing area watershed. Bottom sediments were sampled for purposes of mapping, classifying and designating for removal. Sediment desiccation studies were performed to determine the percent of consolidation and sealing characteristics of the soils in the event of a lake drawdown. Restoration alternatives are presented and compared on the basis of field investigations, laboratory testing and analysis, and the desiccation study. Alternative methods are discussed with respect to the cost, the flexibility and the problems inherent in the different proposals. From the geometry of Megginnis Arm, and construction permit limitations, this study was limited to methods of restoration which include dredging, drawdown and excavation, drawdown and compaction, and drawdown with dredging. By comparing the costs, the practicality, and geotechnical investigation and the flexibility of alternative methods, it is concluded that the drawdown and excavation method is the alternative. The dredging and drawdown and dredging alternatives were determined to be uneconomical and risky. These methods are not recommended.