Biofilms

How do diatoms move within and how on the surface of a biofilm? Do they move from place to place? 


In the upper video on the left you can see diatoms of the species Craticula cuspidata (30x time lapse) in a picture film. 

The video below shows Pinnularia viridiformis on the surface of a biofilm. It has been scattered with tiny particles so that one can see the forces exerted by the diatoms on the surface. 


Details can be found here: https://diatoms.de/en/biofilms-on-substrate