Three weeks later
Three weeks later the main black color
has disappeared. Now we can see that several organisms has grown. For
example, there are seaweeds occupying the majority of our Winogradsky
column. These seaweeds are the same ones that grow in Río San
Pedro's sediment. We can also appreciate the development of the
sulfur fixative bacteria in a reddish tone at the bottom of the
column, where there is no oxygen. We have achieve our obtective:
creating a growth medium with a gradient of oxygen. At the bottom,
only sulfur fixative bacteria have grown, which doesn't need oxygen.
At the top, there are photosynthetic seaweeds, which use oxygen in
their metabolism.
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