In this first picture we can see that the bottom layer, where the anaerobic bacteria habitate hasn't changed a lot, it only got darker (probably due to the accumulation of organic matter).
On the other hand, the rest of the column has experienced some changes.We can now differentiate some reddish threads, which we suppose are created by the iron oxidazing bacteria living in this layer. We also have to mention how this reddish-brown layer has increased its size.
The top layer has also experimented an increase in its size, and we can now appreciate a bigger amount of green algae growing on the top layer of the column. We can also see some little air bubbles which are probably caused by the activity of the aerobic bacteria that live in this upper layer. The change that surprised us the most in this week's update of our column was the appearance of a couple of little hermit snails living a the top of the column.
So here concludes the following of our Winogradsky column.
"reddish threads, which we suppose are created by the iron oxidazing bacteria living in this layer"... Actually they are purple non sulfur bacteria...
ReplyDelete"air bubbles which are probably caused by the activity of the aerobic bacteria" What are these gas bubbles? You say you have algae growing there. What would they produce? And what would aerobic bacteria produce?