Week of October 8th

This week, the most notable change to the Winogradsky columns was the dramatic growth of the cyanobacteria in the 0% salinity column. The other columns have had little change, but the 4% column is beginning to show clearer signs of stratification. Because the first column has had such dramatic growth of cyanobacteria, it might actually obscure other layers, preventing us from counting them in the future. Hopefully other layers will grow enough to be clearly visible.

Figure 1. 0% salinity column with a large amount of growth.

Figure 2. 4% salinity column with some stratification.

Figure 3. 8% salinity column

Figure 4. 12% salinity column

Figure 5. All columns from 0% (left) to 12% (right). The column on the left has cyanobacteria growing even on the plastic wrap. Condensation obscures the view, but there is some floating matter on the other columns.

Salinity	Stratification Layers	Height
Control	Water	3.5 cm
	Sediment Mixture	11.6 cm
4%	Water	3.1 cm
	Sediment Mixture	11.0 cm
8%	Water	3.3 cm
	Sediment Mixture	11.7 cm
12%	Water	3.1 cm
	Sediment Mixture	11.9 cm

Salinity

Stratification Layers

Height

Control

Water

3.5 cm

Sediment Mixture

11.6 cm

4%

Water

3.1 cm

Sediment Mixture

11.0 cm

8%

Water

3.3 cm

Sediment Mixture

11.7 cm

12%

Water

3.1 cm

Sediment Mixture

11.9 cm