Sediments
from the San Pedro river + 1g CaSO4
After two
weeks two distinct phases of water and sediment can be seen. In the
light face (Photo 1) there is no development of colonies at the
first sight , while in the no light face (Photo 2), we can see
different types of colonies with different sizes, punctate and black
color. At this face it is also possible to see an orange delimitation
separating the illuminated face from the dark one. Sediments are
greyish on the part that does not receive light and brown on the
other. In the water phase numerous fine filaments have developed.
When we compared it with the bottle that is in the dark, we realized
that this also presents two distinct phases, but water is much
murkier than the other. The sand is greyish and it presents many more
colonies. It is also possible to observe orange tones as in the case
of the bottle exposed to light, but this time is on the sediment
surface.
What produces all the different colours?
ReplyDeleteI see that the rusty colour is developed in the burrow walls of the sediment. Any suggestions for this?
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