Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Restoration responses of 19 lakes: are TP thresholds common? |
| Keywords | Total phosphorusThresholdsRestorationLakesTrophic status |
| Year | 2011 |
| Type | Contributo in volume |
| Authors | Ingrid Chorus; Martin T. Dokulil; Eddy H.H.R. Lammens; Marina Manca; Luigi Naselli-Flores; Brigitte Nixdorf; Gunnar Persson; Daniel Schindler; Dietmar Straile; Istvan Tátrai; Remy Tadonléké; Eva Willén |
| Text | 308896 2011 Total phosphorus Thresholds Restoration Lakes Trophic status Restoration responses of 19 lakes are TP thresholds common Ingrid Chorus; Martin T. Dokulil; Eddy H.H.R. Lammens; Marina Manca; Luigi Naselli Flores; Brigitte Nixdorf; Gunnar Persson; Daniel Schindler; Dietmar Straile; Istvan Tatrai; Remy Tadonleke; Eva Willen Umweltbundesamt, Germany ; Research Institute for Limnology, Mondsee, of the University of Innsbruck ; WS RIZA, P.O. Box 17, 8200 AA Lelystad, The Netherlands ; CNR ISE, Pallanza Verbania ; Universita di Palermo ; Brandenburgisch Technische Universitat Cottbus BTU ; University of Copenhagen ; School of Aquatic and Fishery Sciences ; Limnological Institute, University of Konstanz ; Balaton Limnological Research Institute, H 8237 Tihany, Hungary ; Universite Blaise Pascal Clermont Ferrand II , Laboratoire de Biologie des Protistes ; Swedish University of Agricultural Sciences Uppsala, Sweden A key outcome of this 19 lake analysis is that non linear responses of phytoplankton biomass to declining TP concentrations are indeed common 12 lakes showed pronounced non linear responses, and among these, 5 stratified and 2 shallow lakes showed clear TP thresholds above which TP did not control seasonal means of Chl.a concentrations Table 4 . Others showed resilience against Chl.a reduction in spite of a significant range of TP reduction e.g. Wahnbach Reservoir in the range of mean TP concentrations declining from 35 to 20 μg/L and Lake Geneva as TP declined from 45 to 25 μg/L. Yet others have not moved through a sufficiently large span of TP concentrations to show such thresholds e.g. Lago Maggiore, Petersdorfer See, Melangsee and the Galten Basin of Lake Malaren . Furthermore, some non linear response patterns are also due to other factors such as changes in grazing pressure, both in deep stratifying lakes e.g. in Lago Maggiore, Lake Geneva and in shallow lakes e.g. Veluvemeer . For the shallow lakes the plateaus of Chl.a over TP during their highly eutrophic phases are not as pronounced rather, in the range of high TP concentrations their seasonal means of Chl.a against TP zig zag or spiral between higher and somewhat reduced levels, with Chl.a following TP only in some years. As their mean TP concentrations declined further through the lower concentration range, means of Chl.a follow TP more closely. Contrary to the early results published by Sas 1989 , for deeper stratified lakes the longer time series now available show markedly less variability than those for the shallow lakes, both when comparing responses between lakes and when analysing time series for individual lakes. Oligotrophication of Lake Tegel and Schlachtensee, Berlin. Analysis of system components, causalities and response thresholds compared to responses of other waterbodies Ingrid Chorus, Inke Schauser Published version ID_PUMA cnr.ise/2011 A1 008 Capitolo Restoration responses of 19 lakes are TP thresholds common 2011_A1_008.pdf Contributo in volume Umweltbundesamt. 0722 186X Texte Umweltbundesamt Texte Umweltbundesamt Texte Umweltbundesamt Texte. Texte Umweltbundesamt. Print marinamarcella.manca MANCA MARINA MARCELLA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |