Team 4
Tampakidou Maria-Ioanna, 1479, Mpelonias Fivos, 1178 University of Ioannina
5th-6th week observation: 11/11/2016 - 18/11/2016
The winograsky column-1
(contains eggs and it is closed) on the right has dark-black color that
surely reveals anoxic conditions in the water. This is a sign of the
presence of sulfate reducers and methanogens (archae).
This column contains a lot of sulfide and very sandy sediment that
allow the sulfide to diffuse easily into the bulk of the column, and as a
result is anaerobic throughout. In addition, there are a lot of
organics (great amount of eggs and paper) that make the decomposers
increase. Many decomposers use sulfur, ferum and other kinds of anorganic matterials to oxidate organic matter and produce energy. In some of these reactions there are byproducts such as hydrogen sulfide (H2S) and methane CH4 that cause the black color of the water.
On the other hand, in the winograsky column-2 (contains plasters and it is open) the water isn’t still clear anymore. It has been light green which is a sign of photosynthetic conditions. There is definatelly some green algae and cyanobacteria , we can also see the biofilm which is products of microorganism witch after the live there. Moreover, there are some organisms swimming in the water. They could be eterotrophs and consume the autotrophs and their byproducts. Some of them have overall shape .The
mud, is still totally black in some points and in some others is
orange-red. It is a proof of red sulfur bacteria that finally are really
observable. In the same time, the black spot are becoming bigger as sign of sulphur reducing bacteria such as Desulfovibrio that use products for anaerobic respiration using sulphates producing lots of H 2S. This H 2S will react with any iron producing black ferrous sulphide.
5th week
