Abstract
The vegetational changes in a newly dammed area on the Nanni Creek Basin in NW Suriname are here considered. The effects of periodical flooding on the different vegetation types are studied, and the types of succession ocurring at present are described. It is postulated that marsh forests that are now being drowned will be replaced by a Triplaris swamp forest. Peat levels will probably remain constant, as any accumulation of peat during high water seems to be counter-balanced by peat decomposition and destruction by fire during low water levels.