Abstract
Phytoplankton biomass and species composition were measured with a relatively high temporal resolution (once or twice a week during the growing season) from 1979 to 1989 in Lake Constance/Überlingersee. Over this period soluble reactive phosphorus (SRP) concentrations during winter mixing were reduced by ca. 50% from 104 to 47 μg 1−1, which caused a prolongation and amplification of the epilimnetic P depletion during the growth period. Seasonal dynamics of phytoplankton reacted to the decrease of SRP in the following ways: (1) Algal biomass decreased at least proportionally to the winter SRP concentrations in summer, but not in spring and autumn when biomass fluctuated irregularly. (2) The peak of biomass concentration changed from summer to spring. (3) The earlier onset of epilimnetic P depletion during the season in recent years promoted a stronger growth of some pennate diatoms in spring. It caused an amplification of the silicon depletion in summer, which may cause still greater reduction of diatoms and total algal biomass in summer. (4) Reduction of algal biomass during the clear-water phase proper became shorter and less pronounced. (5) The temporal variability of algal biomass decreased in summer and autumn but not in spring. (6) Average cell sizes remained unchanged in summer and autumn but increased in spring during the beginning of oligotrophication. These results are largely in agreement with other studies on lake restoration and expectations derived from the PEG (Plankton Ecology Group) model (Sommer et al. 1986). They show that a 50% reduction of SRP concentrations during homothermy may have pronounced effects on seasonal dynamics of algal biomass in a large and deep lake. The algal response to the external change of SRP concentrations can be described by the Le Chatelier principle, implying that the internal structure of the system (e.g. species composition) changes in order to minimize the effect of the external pressure (e.g. reduction of total biomass). Suggestions are made as to how this system behaviour may emerge from local interactions.
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References
Braunwarth C (1988) Populationsdynamik natürlicher Phytoplanktonpopulationen: Analyse der in-situ Wachstums- und Verlustraten. Dissertation Univ Konstanz, FRG
Einsle U (1987) Die Entwicklung des Crustaceen-Planktons im bodensee-Obersee 1972–1985 und Untersee-Gnadensee und Rheinsee (1974–1985). Ber Int Gewässerchutzkomm Bodensee 37
Elster HJ (1979) Das Ökosystem Bodensee in Vergangenheit, Gegenwart und Zukunft. Schr Ver Geschichte Bodensees 92:233–250
Elster HJ (1982) Neuere Untersuchungen über die Eutrophierung und Sanicrung des Bodensees. GWF-Wasser/Abwasser 123:277–287
Gaedke U, Schimmele M (1990) The potential impact of internal seiches on observed population dynamics of planktonic organisms in Lake Constance. Verh Int Ver Limnol 24:80–84
Gaedke U, Schimmele M (1991) Internal seiches in Lake constance: Influence on plankton abundance at a fixed sampling site. J Plankton Res 13 (4):743–754
Geller W (1980) Stabile Zeitmuster in der Planktonsukzession des Bodensees (Überlinger See). Verh Ges Ökol 8:373–382
Geller W, Berberovic R, Gaedke U, Müller H, Pauli HR, Tilzer MM, Weisse T (1991) Relations among the components of autotrophic and heterotrophic plankton during the seasonal cycle 1987 in Lake Constance. Verh In Ver Limnol 24:831–836
Grim J (1951) Vergleich der Produktionsleistung des Bodensee-Untersees, des Obersees und des Schleinsees. Arch Fisch Hilfswiss 47:787–841
Grover JP (1989) Phosphorus dependent growth kinetics of eleven species of freshwater algae. Limnol Oceanogr 34:341–348
Grunwald B, Mauser W (1991) Untersuchungen zur horizontalen Heterogenität der Chlorophyll-Konzentration im Bodenseemit Hilfe von Satellitenbildern. Beitr Hydrol Sonderh 10 Kirchzarten
Güde H (1990) Bacterial Production and the Flow of Organic Matter in Lake Constance. In: Tilzer MM, Serruya C (eds) Large lakes-ecological structure and function (Contemporary Bioscience), pp 489–502
Güde H (1991) Participation of bacterioplankton in epilimnetic phosphorous cycles of Lake Constance. Verh Int Ver Limnol 24:816–820
Kümmerlin R (1991) Long term development of phytoplankton in Lake Constance. Verh Int Ver Limnol 24:826–830
Kümmerlin R, Bürgi HR (1989) Die langjährige Entwicklung des Phytoplanktons im Bodensee (1961–1986). Ber Int Gewässerschutzkomm Bodensee 39
Müller H, Stich B (1991) Saisonale Variabilität des Chlorophyllgehaltes im Bodensee-Obersee (1980–1990). Erweiterte Zusammenfassungen der Jahrestagung 1991 der Deutschen Gesellschaft für Limnologie, Mondsee, pp 51–56
Rothhaupt KO, Güde H (1992) The influence of spatial and temporal concentration gradients on phosphate partitioning between different plankton size fractions: further evidence and possible causes. Limnol Oceanogr 37:733–749
Sas H (ed) (1989) P!? Lake restoration by reduction of nutrient loading: Expectations, Experiences, Extrapolations. Academia Verlag Richarz, St Augustin FRG
Smith VH (1990) Phytoplankton responses to eutrophication in inland waters. In: Akatsuka I (ed) Introduction to applied phycology. SPB Academic Publishing, The Hague, pp 231–249
Sommer U (1987) Factors controlling the seasonal variation in phytoplankton species composition — A case study for a deep, nutrient rich lake (Lake Constance). Prog Phycol Res 5:123–178
Sommer U, Gliwicz ZM, Lampert W, Duncan A (1986) The PEG-model of seasonal succession of planktonic events in fresh waters. Arch Hydrobiol 106:433–471
Sommer U, Gaedke U, Schweizer A (1993) The first decade of oligotrophication of Lake Constance: II. The response of phytoplankton taxonomic composition. Oecologia 93:276–284
Stabel HH (1991) Irregular biomass response in recovering prealpine lakes. Verh Int Ver Limnol 24:810–815
Suttle CA, Stockner JG, Shortread KF, Harrison PJ (1988) Time-course of size-fractionated phosphate uptake: Are larger cells better competitors for pulses of phosphate than smaller cells? Occologia 74:571–576
Tilzer MM, Beese B (1988) The seasonal productivity cycle of phytoplankton and controlling factors in Lake Constance. Schweiz Z Hydrol 50:1–39
Tilzer MM, Sommer U, Geller W, Eckmann R, Stabel HH (1985) Untersuchungen zum Stoffhaushalt in der Freiwasserzone des Bodensees/überlinger See. GWF-wasser/abwasser 126:461–466
Tilzer MM, Gaedke U, Schweizer A, Beese B, Wieser T (1991) Interannual variability of phytoplankton productivity and related parameters in Lake Constance: No response to decreased phosphorus loading? J Plankton Res 13:755–777
Utermöhl (1958) Zur Vervollkommnung der quantitativen Phytoplankton-Methodik. Int Ver Theor Angew Limnol 9:1–38
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Gaedke, U., Schweizer, A. The first decade of oligotrophication in Lake Constance. Oecologia 93, 268–275 (1993). https://doi.org/10.1007/BF00317681
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DOI: https://doi.org/10.1007/BF00317681