Indications of dynamics in the present-day vegetation of the Federsee fen ecosystem (SW-Germany) - a development of two hundred years tab: 2
Grüttner, A.; Warnke-Grüttner, R.
The Federsee fen ecosystem developed on the former lake bottom due to a lowering of the lake level by man at the end of the 18th century. The following phenomenons indicate a quickly proceeding succession in the young Federsee fen ecosystem: 1. The fen plant communities exhibit a species composition very different from nearby mires. The species numbers are also much higher. 2. There exist a lot of often almost round polycormon patches. The increase of some of them could be indicated by measuring the patches on different old photographs. 3. A remarkably high number of mire species (of hollows and naked peat) is missing today. One reason could be the decrease of direct human influence, another the natural mire development. On the other hand a lot of woodland species seem to have immigrated, most likely in consequence of the increase of wood habitats. 4. Correspondingly, certain plant communities have increased their terrain (Phragmitetum australis, Carex acutiformis community), others have nearly vanished today (Caricetum elatae, Caricetum limosae).