Hello, bloggers:
It's been four weeks since this experiment began. The changes come slowly, but our mini ecosystem evolves.
I remind you that our Winogradsky column contains a mixture of muddy sediment from San Pedro river and muddy sediment from a hypersaline pond. Moreover, we added Enrichments as: CaCO3, FeSO4 and NaCl (salt).
Since our last publication, surface aqueous medium has become a blue-green color, and greenish solid particles have appeared on it . It also notes that the diversification of the mud color is appearing. At the top the color is slightly lighter, with greenish tones, while in the background has a darker, reddish color.
These are the changes that have occurred in the area of exposure to light.
The area where the light does not reach has remained largely unchanged. Black spot we indicated in the above publication are maintained.
Each color is caused by the activity of different bacteria:
The bluish-green color of the upper zone indicates the presence of cyanobacteria.
The red color comes from purple non-sulfur bacteria.
The black spots are due to the reaction of H2S released by bacteria with soil iron.
Here you have some pictures of how the column is now.
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