Long-term limnological research and monitoring at Crater Lake, Oregon.- Subaqueous geology and a filling model for Crater Lake, Oregon.- Evaporation and the hydrologic budget of Crater Lake, Oregon.- Long-term observations of deepwater renewal in Crater Lake, Oregon.- Thermal, chemical, and optical properties of Crater Lake, Oregon.- The extent and significance of petroleum hydrocarbon contamination in Crater Lake, Oregon.- Ultraviolet radiation and bio-optics in Crater Lake, Oregon.- Predicting Secchi disk depth from average beam attenuation in a deep, ultra-clear lake.- Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR.- Bacterioplankton communities of Crater Lake, OR: dynamic changes with euphotic zone food web structure and stable deep water populations.- Seasonal and interannual variability in the taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon.- Nutrient limitation in Crater Lake, Oregon.- Distribution and abundance of zooplankton populations in Crater Lake, Oregon.- Variability of kokanee and rainbow trout food habits, distribution, and population dynamics, in an ultraoligotrophic lake with no manipulative management.- Seasonal nutrient and plankton dynamics in a physical-biological model of Crater Lake.