Datensatz – Data@IOB

Veröffentlichung Informationen

Kurzbeschreibung: Loss of Submerged Macrophytes in Shallow Lakes in North-Eastern Germany

Zusammenfassung: During the 1950s, the submerged vegetation of shallow lakes in north-eastern Germany was dominated by nutrient tolerant species, with Ceratophyllum demersum and Myriophyllum sp. being most common. Almost one third of 300 investigated lakes had already lost their submerged macrophytes at that time. Very shallow lakes showed either high or low macrophyte abundance. Increasing depth resulted in medium macrophyte abundances, which may contribute to the stabilisation of local or temporary clearwater states. Forty years later, the percentage of lakes without macrophytes had dramatically increased. Between 55 and 85% of the investigated lakes showed a low abundance. The decline was most pronounced in very shallow lakes. The majority of the investigated lakes showed summer TP concentrations below 100 µg L–1, but no colonisation by submerged macrophytes, which indicates a resilience against re-colonisation.

freie Suchbegriffe: : alternative stable states, macrophyte re-colonisation, macrophyte decline