Reconstructing reservoir trophic status using diatoms as indicators of nutrient loading

This study examines diatom distribution within cores taken from three reservoirs in central Texas. Diatom species are sensitive to changes in their environment; therefore, diatoms could be used to determine environmental condition within the reservoir at a given time. Diatoms were found to at least 100cm in each reservoir. There was no change in morphological types; however, there are variations in Pennate to Centric ratio within the cores. Statistical analysis showed a strong relationship between nitrogen and phosphorus down core, and phosphorus and nitrogen concentrations are strongly influenced by hydrology. There is relationship between total diatoms and phosphate concentrations in two reservoirs. However, it is important to note the small sample size of this study.