The lake some how greatly influences water as it moves through. Surface water at the dam also differs from discharge water, indicating that at least some of these differences are due to differences among depth in processes that affect water quality. Light ultimately influences the vertical distributions of physical and chemical parameters. Water quality parameters vary with depth. At stations wdhere light penetration is deeper, thermocline is deeper.
Oxygen changes rapidly at the thermocline.
Vertical pattern of pH is inversely related to oxygen. Also include the prediction you are testing. Ecologist studying interactions between trophic levels have suggested that trophic levels higher than phytoplankton could also effect phytoplankton production and standing crop. Also consider that both or neither of the above hypotheses could be supported by our data . For your data analysis and graphs, you may work in groups.