Alte Teichlandschaften im osterreichischen Waldviertel: Vegetation und Diasporenpotential des Schonauer Teiches bei Zwettl
Koch, Marcus; Bernhardt, Karl-Georg Webhofer
published: Feb 25, 2005
The north western Waldviertel in Lower Austria, close to the border of the Czech Republic, is well known for its extensive fishery since the 16th century. The traditional land use and fish pond management with regular de-flooding and periodical oscillations of the water level has resulted in the establishment of characteristic reed and pioneer vegetation along shore lines and unflooded pond grounds. During the investigation period from 2000–2002 we analysed the vegetation and found numerous europe-widely endangered plant species (Coleanthus subtilis, Limosella aquatica, Elatine triandra, Elatine hexapetala, Elatine hydropiper, Spergularia echinosperma, Eleocharis ovata, Carex bohemica or Scirpus radicans). Moreover, several rare and characteristic mosses were documented, such as three Riccia species. The remarkable dynamics of the habitat are favouring evolution and speciation processes, and several hybrid swarms from the genus Carex (C. vesicaria, C. rostrata, and C. gracilis, C. nigra) were documented. A special focus is given here on the soil seed bank for two reasons: it is important for the recruitment of new generations and its long persistence and longevity has implications for nature and species conservation efforts. All species from the actual vegetation could also be found in the soil seed bank, which exhibited densities from 104.000 to 1.447.000 seeds/m2.