Well, the pontederia has thickened. One even separated in some way and seems to be starting its own little island. (In the circle, top right, in the first pic) The acorus seems to have all perished. Also, if the information was indeed correct, the island is not generating much root mass buoyancy gas. It used to have half to a quarter of an inch freeboard. Not now!
[Linked Image from spillerfamily.info]

The duckeed and wolfia is almost thick enough to walk on. That seems to be enough for the breakway piece of pontederia to start its own island. After it first 'broke off,' it lay on the surface, horizontally, for quite some time. I shall be watching with some interest. Especially as winter temperatures seems to thin the surface weed mat.
[Linked Image from spillerfamily.info]