The population of the biofilm has become more diverse, both in terms of species and size of organisms. A number of tiny circular organisms buzz quickly through the biofilm and larger protists leisurely slide over the water. The biofilm has clumped. It is denser and smaller. In bunches on the surface of the water.
https://youtu.be/sTMle6V8vFw
Surface Water over a Busy Biofilm
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DonSchaeffer
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