The control column is showing a lot more variability in its color and layering. These results confirm our hypothesis from the beginning of this experiment, which was adding more salt will decrease the growth of the organisms, resulting is less color variability. In the salty concentrations, there is almost no band formation and the coloration is the same throughout. Another thing that I noticed looking at our salty columns is that the water level seems to decrease with increasing salinity. Not only has the water level decreased, it has also settled on top of the sediment, making it more difficult for any of the bacteria lower in the column to get the water they need. This could be a major cause of less growth in these columns. Finally, the coloration at the top of the columns are different as the salinity increases. There is a lot of green at the top of the control column and more reddish orange coloration in the higher salt columns. What this shows is that the cyanobacteria are highly affected by the addition of the salt and that the type of cyanobacteria in the column will vary based on salt concentration.
-Courtney
Left to right: Control, 4% Salinity, 8% Salinity, and 12% Salinity
Left to right: 4% Salinity, 12% Salinity, 8% Salinity, Control
Order is the same as picture above.
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