Abstract
Phytoplankton from Lake Albufera, a shallow, polimictic, freshwater lake, was studied before and after sewage diversion. The lake is used as a reservoir for rice cultivation in the surrounding lake area. Due to antropogenic eutrophication in the 1960s, the lake turned from a mesotrophic to a hypertrophic, turbid state. In 1991, a restoration plan of the lake started which has reduced 30% of sewage effluents. Total phosphorus in the lake was reduced about 31%, from 0.49 to 0.34 mg l−1, but nitrate did not vary. Chlorophyll-a mean annual values diminished to half, although hypertrophic levels remained (mean value from 318 μg l−1 to 180 μg l−1). The algal community structure indicates a response to P reduction in the direction of increasing equal contribution of algal groups. Cyanobacteria are still the dominant group, but reduced their biomass by about 15%, due to filamentous cyanobacteria depletion (from 78% to 48% of total phytoplankton biovolume), in favour of chroococcal cyanobacteria (changed from 7 to 23% in the 1990s). Other algal groups, especially diatoms and chlorophytes, also increased their contribution in the phytoplankton after nutrient diversion, while euglenophytes, indicative of organic matter pollution in the lake, decreased. There were pronounced changes in phytoplankton composition and a general trend toward presence of smaller algal species. The dominant species in biovolume during the 1980s, Planktothrix agardhii, almost disappeared in the lake in the 1990s, and was replaced seasonally by the slender Pseudanabaena galeata. Disappearance of Planktothrix agardhii, allowed large Cladocera to control algae early in the year (dominant small diatoms and chlorophytes), during several clear water phases occurring in recent years that lasted up to five weeks. Even though some improvement of the lake water quality was observed, complementary restoration measures are suggested, such as a reduction of phosphorus below 0.05 mg l−1, control of pesticides in the catchment area, and management of benthivorous-planktivorous fish species, in order to re-establish phytoplankton composition and submerged plants as at the beginning of the 20th century.
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References
APHA-AWWA-WEF, 1992. Standard Methods for the Examination of Water and Wastewater, 18th edition. American Public Health Association. Washington D.C.
Alfonso, M. T. & M. R. Miracle, 1990. Distribución espacial de las comunidades zooplanctónicas de la Albufera de Valencia. Scientia gerundensis, 16/2: 11–25.
Arévalo, C. 1916. Indroducción al estudio de los Cladóceros del plancton de la Albufera de Valencia. Trab. Lab. Hdrob. Esp. 1. Anales del Instituto General y Técnico de Valencia, vol. I.
Bailey-Watts, A. E., A. Kirika, L. May & D. H. Jones, 1990. Changes in phytoplankton over various time scales in a shallow, eutrophic lake: the Loch Leven experience with special reference to the influence of flushing rate. Freshwat. Biol. 23: 85–111.
Beklioglu, M., L. Carvalho & B. Moss, 1999. Rapid recovery of a shallow hypertrophic lake following sewage effluent diversion: lack of chemical resilience. Hydrobiologia 412: 5–15.
Berger, C. & H. E. Sweers, 1988. The Ijsselmeer and its phytoplankton with special attention to the suitability of the lake as a habitat for Oscillatoria agardhii Gom. J. Plankton Res. 10: 579–599.
Blanco, C. 1974. Estudio de la contaminación de la Albufera de Valencia y de los efectos de dicha contaminación sobre la fauna y flora del lago. PhD Thesis, Universidad de Valencia (Spain), 193 pp.
Blanco, S., S. Romo, M. J. Villena & S. Martínez. 2003. Fish communities and food web interactions in six shallow Mediterranean lakes. Hydrobiologia 506–509: 473–480.
Cullen, P. & C. Forsberg, 1988. Experiences with reducing point sources of phosphorus to lakes. Hydrobiologia 170: 321–336.
Dafauce, C. 1975. La Abufera de Valencia. Un estudio piloto. Monografías ICONA 4: 1–127.
Dokulil, M. T. & J. Padisák, 1994. Long-term compositional response of phytoplankton in a shallow, turbid environment, Neusiedlersee (Austria/Hungary). Hydrobiologia 276: 125–137.
Jagtman, E., D. T. Van Der Molen & S. Vermij, 1992. The influence of flushing on nutrient dynamics, composition and densities of algae and transparency in Veluwemeer, The Netherlands. Hydrobiologia 233: 187–196.
Jeppesen, E., J. P. Jensen & M. Sondergaard, 2002. Response of phytoplankton, zooplankton, and fish to re-oligotrophication: An 11 year study of 23 Danish lakes. Aquat. Ecosyst. Health Manag. 5: 31–43.
Jeppesen, E., J. P. Jensen, M. Sondergaard, T. Lauridsen & F. Landkildehus, 2000. Trophic structures, species richness and biodiversity in Danish lakes: changes along a phosphorus gradient. Freshwat. Biol. 45: 201–213. 287
Jeppesen, E., M. Sondergaard, N. Mazzeo, M. Meerhoff, C. C. Branco, V. Huszar & F. Scasso, 2003. Lake restoration and biomanipulation in temperate lakes: relevance for subtropical and tropical lakes. In Reddy, V. (ed.), Tropical Eutrophic Lakes: Their Restoration and Management (in press).
Kangur, K., T. Möls, A. Milius & R. Laugaste, 2003. Phytoplankton response to decreasing nutrient level in Lake Peipsi (Estonia) in 1992–2001. Hydrobiologia 506–509: 265–272.
Köhler, J., H. Behrendt & S. Hoeg, 2000. Long-term response of phytoplankton to reduced nutrient load in the flushed Lake Müggelsee (Spree system, Germany). Arch. Hydrobiol. 148: 209–229.
Kumagai, M. & F. V. Warwick, 2003. Freshwater Management. Global Versus Local Perspectives. Springer-Verlag, Berlin.
Lund, J.W. G., C. Kipling & E. D. Le Cren, 1958. The inverted microscope method of estimating algal numbers and the statistical basis of estimations by counting. Hydrobiologia 11: 143–170.
Meijer, M. L. & H. Hosper, 1997. Effects of biomanipulation in the large and shallow lake Wolderwijd, the Netherlands. Hydrobiologia 342/343: 335–349.
Moss, B., J. Madgewick & G. Phillips, 1996. A guide to the restoration of nutrient-enriched shallow lakes. Environmental Agency, Broads Authority, Manchester, 180 pp.
Nicklisch A., B. Roloff, & A. Ratsch, 1991. Competition experiments with two planktonic blue-green algae (Oscillatoriaceae). Verh. int. Ver. Limnol. 24: 889–892.
Olli, E. V., 1989. Simulated impacts of flow regulation on bluegreen algae in a short retention time lake. Arch. Hydrobiol. 33: 181–189.
Oltra, R., M. T. Alfonso, M. Sahuquillo & M. R. Miracle, 2001. Increase of rotifer diversity after sewage diversion in the hypertrophic lagoon, Albufera of Valencia, Spain. Hydrobiologia 446/447: 213–220.
Padisák, J. & C. S. Reynolds, 1998. Selection of phytoplankton associations in Lake Balaton, Hungary, in response to eutrophication and restoration measures, with special reference to cyanoprokaryotes. Hydrobiologia 384: 41–53.
Pardo, L., 1942. La Albufera de Valencia. Biología de las aguas continentales II. Instituto Forestal de Investigaciones y Experiencias, Madrid, 263 pp.
Reynolds, C. S., 1984. The Ecology of Freshwater Phytoplankton. Cambridge University Press, Cambridge.
Reynolds, C. S., 1992. Eutrophication and the management of planktonic algae: what Vollenweider couldn't tell us. In Sutcliffe, D. W. & J. G. Jones (eds), Eutrophication: Research and Application toWater Supply. Freshwater Biological Association, Ambleside: 4–29.
Romo, S., 1997. Importance of allochthonous phytoplankton in a coastal freshwater lake. Verh. int. Ver. Limnol. 26: 610–614.
Romo, S. & M. R. Miracle, 1993. Long-term periodicity of Planktothrix agardhii, Pseudanabaena galeata and Geitlerinema sp. in a shallow hypertrophic lagoon, the Albufera of Valencia (Spain). Arch. Hydrobiol. 126: 469–486.
Romo, S. & M. R. Miracle, 1994. Population dynamics and ecology of subdominant phytoplankton species in a shallow hypertrophic lake (Albufera of Valencia, Spain). Hydrobiologia 273: 37–56.
Romo, S., M. R. Miracle, M. J. Villena, J. Rueda, C. Ferriol & E. Vicente, 2003. Mesocosm experiments on shallow lake food webs in a Mediterranean climate. Freshwat. Biol.. In press.
Sas, H. 1989. Lake restoration by reduction of nutrient loading: expectations, experiences, extrapolations. Academia Verlag Richarz, Sankt Augustin, 497 pp.
Scheffer, M., S. Carpenter, J. A. Foley, C. Folke & B. Walker, 2001. Catastrophic shifts in ecosystems. Nature 413: 591–596.
Scheffer, M., S. H. Hosper, M. L. Meijer, B. Moss & E. Jeppesen, 1993. Alternative equilibria in shallow lakes. Trends Ecol. Evol. 8: 275–279.
Scheffer, M., S. Rinaldi, A. Gragnani, L. R. Mur & E. H. van Nes, 1997. On the dominance of filamentous cyanobacteria in shallow, turbid lakes. Ecology 78: 272–282.
Shannon, C. E. & W. Weaver, 1963. The Mathematical Theory of Communication. University of Illinois Press, Urbana, Illinois, 117 pp.
Soria, J. M., 1997. Estudio limnológico de los ecosistemas acuáticos del ‘Parc Natural de l'Albufera’ de Valencia. PhD Thesis, Universidad de Valencia, Valencia, 289 pp.
Soria, J. M.,M. R. Miracle & E. Vicente, 1987. Aporte de nutrientes y eutrofización de la Albufera de Valencia. Limnetica 3: 227– 242.
Stoyneva, M. P., 1998. Development of the phytoplankton of the shallow Srebarna Lake (north-eastern Bulgaria) across a trophic gradient. Hydrobiologia 369/370: 259–267.
Wojciechowski, I., W. Wojciechowska, K. Czernas, J. Galek & K. Religa, 1988. Changes in phytoplankton over a ten-year period in a lake undergoing de-eutrophication due to surrounding peat bogs. Arch. Hydrobiol. 78: 373–387.
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Villena, MJ., Romo, S. Phytoplankton changes in a shallow Mediterranean lake (Albufera of Valencia, Spain) after sewage diversion. Hydrobiologia 506, 281–287 (2003). https://doi.org/10.1023/B:HYDR.0000008565.23626.aa
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DOI: https://doi.org/10.1023/B:HYDR.0000008565.23626.aa