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.
Wetlands sure look different than lakes and streams.
They got big green things sticking out of them that really grow fast and lots of water move in and out of most wetlands. In the salt marsh, water quality changes over time and these changes are related to tidal movement of water into and out of the marsh. In the freshwater marsh, water quality changes spatially from water entering the system to water exiting the systems. Zonation of plant species differs between salt marsh and freshwater marshes. Gosh, water seems to be going just one way.