A couple of winters ago a small willow dominated pit had its cover of trees removed and the vegetation is still in transition. A range of ruderal species grow on what was once shaded bare ground around the pit whilst the open water, lacking in aquatic flowering plants, is dominated by filamentous algae, with unicellular algae colouring the water.
Over time of course the vegetation will settle down and become dominated by the species associated with unshaded wetlands, with seeds lying dormant in the seed bank in the silt at the bottom of the pond providing some of the likely successful species.
The aquatic fauna seems to be on the way to establishing itself too. Peering into the turbid water to see if I could spot one of the medicinal leeches I noticed a few weeks back, subtle movements drew attention to