A good example of succession is the hydrarch succession or hydrosere succession, in which, a pond and its community are converted into a land community. In their reed swamp stage, amphibious plants grow where the water body becomes shallow ($0.3$$1.0 \mathrm{~m}$ ), $e.g.$,Sagittaria. Juncus shows sedge-medow stage, Salix shows woodland stage, while Trapa shows rooted-floating stage.