, Volume 490, Issue 1–3, pp 93–105 | Cite as

Restoration of the eutrophic Lake Eymir, Turkey, by biomanipulation after a major external nutrient control I

  • M. Beklioglu
  • O. Ince
  • I. Tuzun


Nutrient loading in lakes is recognized as a serious threat to water quality. Over 25 years of raw sewage effluent discharge shifted Lake Eymir from a state dominated by submerged plants to a turbid water state. Successful effluent diversion undertaken in 1995 achieved 88% and 95% reductions in the areal loading of total phosphorus (TP) and dissolved inorganic nitrogen (DIN), respectively. Furthermore, the reduced load of TP was very close to the suggested threshold areal load (0.6 g m−2 yr−1) to attain recovery. Even though diversion also reduced the in-lake TP level by half, the poor water clarity and low submerged plant coverage (112 ± 43 cm and 2.5% coverage of the lake total surface area, respectively) persisted. Domination of the fish stock by planktivorous tench (Tinca tinca L.) and the benthivorous common carp (Cyprinus carpio L.) (66 ± 0.7 and 31 ± 1 kg CPUE, respectively) appeared to perpetuate the poor water condition. A substantial fish removal effort over 1 year achieved a 57% reduction in the fish stock which led to a 2.5-fold increase in Secchi disk transparency. This increase occurred largely because of a 4.5-fold decrease in the inorganic suspended solid concentration, and to some extent, a decrease in chlorophyll-a concentration. A strong top-down effect of fish on the large-sized grazers was evident as density and the body size of Daphnia pulexde Geer increased significantly after the fish removal. Even though the spring and annual euphotic depths occurred well above the maximum and mean depths of the lake, respectively, re-development of submerged plants was poor (6.2% coverage). A weak re-establishment of submerged plants might be attributed to an insufficiently viable seed bank, inappropriate chemical conditions of the sediment (severe oxygen deficiency), or to the high coot (Fulica atra L.) density. However, the top-down effect of fish appeared to be of great importance in determining water clarity, and in turn, conditions for submerged plant development in a warm temperate lake as recorded in the north temperate lakes. Furthermore, this study provides evidence for the importance of top-down control of fish, which, in turn, can be effectively utilised as a restoration strategy in warm-temperate lakes as well. More applications, along with long monitoring programs, are needed to develop a better understanding about requirements for biomanipulation success in this climate.

biomanipulation eutrophication sewage effluent diversion submerged plants suspended solids warm-temperate climate 


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  1. Altinbilek, D., N. Usul, H. Yazicio¢glu, Y. Kuto¢glu, N. Merzi, M. Gö¢gü¸s, V. Doyuran & A. Günyakti, 1995. Gölba¸si-Mogan-Eymir gölleri için su kaynaklar ve çevre yönetim plani projesi, Mogan ve Eymir Gölleri 1. Çevre Kurultayi:. 13–21 (in Turkis)Google Scholar
  2. APHA, 1998. Standard Methods for Examination of Water and Wastewater, 20th edn., New York: 895 pp.Google Scholar
  3. Beklioglu, M. & B. Moss, 1996. Mesocosm experiments on the interaction of sediment influence, fish predation and aquatic plants with the structure of phytoplankton and zooplankton communities. Freshwat. Biol. 36: 315–325.Google Scholar
  4. Beklioglu, M., G. Altinayar & C. O. Tan, 2001. Role of water level fluctuations, nutrients and fish in determining the macrophytedominated clear-water states in five Turkish shallow lakes. In an International Workshop on Shallow Lake Wetlands:Ecology, Eutrophication and Restoration. 28–30 October 2001, Ankara, Turkey.Google Scholar
  5. 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.Google Scholar
  6. Benndorf, J., 1987. Food web manipulation without nutrient control: a useful strategy in lake restoration. Schweiz. Z. Hydrol. 49: 237–248.Google Scholar
  7. Benndorf, J., 1990. Conditions for effective biomanipulation; conclusions derived from whole-lake experiments in Europe. Hydrobiologia 200/201: 187–203.Google Scholar
  8. Boström, B., M. Jansson & C. Forsberg, 1982. Phosphorus release from lake sediments. Arch. Hydrobiol. Beih. Ergebn. Limnol. 18: 5–59Google Scholar
  9. Bottrell, H. H., A. Duncan, Z. M. Gliwicz, E. Grygiereg, A. Herzig, A. Hillbricht-Ilkowska, H. Kurasawa, P. Larsson & T. Weyleleuska, 1976. A review of some problems in zooplankton production studies. Norw. J. Zool. 24: 419–456Google Scholar
  10. Breukelaar, W. A., H. R. R. E. Lammens, J. G. P. K. Breteler & I. Tatrai, 1994. Effects of benthivorous bream (Abramis brama) and carp (Cyprinus carpio) on sediment resuspension and concentrations of nutrients and chlorophyll-a. Freshwat. Biol. 32: 113–121.Google Scholar
  11. Carpenter, S. R., J. F. Kitchell & J. R. Hodgson, 1985. Cascading trophic interactions and lake productivity. BioScience 35: 634–639.Google Scholar
  12. Chaney, A. L & E. P. Morbach, 1962. Modified reagents for the determination of urea and ammonia. Clin. Chem. 8: 130–132.Google Scholar
  13. Crivelli, A. J., 1983. The destruction of aquatic vegetation by carp, Hydrobiologia 106: 37–41.Google Scholar
  14. Dodson, S. L., S. E. Arnott & K. L. Cottingham, 2000. The relationship in lake communities between primary productivity and species richness. Ecology 81: 2662–2679.Google Scholar
  15. EIE, 2001. Mogan ve Eymir Gölleri havzasinin hidrometeorolojik özellikleri. Technical Report. Turkish General Directorate of Electrical Power, Resources Survey and Development Administration, Ankara: 159 pp. (in Turkish).Google Scholar
  16. Edmonson, W. T., 1985. Recovery of Lake Washington from eutrophication. Proceedings from lakes Pollution and ecovery, Rome 15–18 April: 228–234.Google Scholar
  17. Ganf, G. G. & R. L. Oliver, 1982. Vertical separation of light and available nutrients as factor causing replacement of green algae by blue-green algae in the plankton of stratified lake. J. Ecol. 70: 529–844.Google Scholar
  18. Geldiay, R., 1949. Çubuk Baraji ve Emir Gölünün Makro ve Mikro Faunasinin Mukayeseli Incelenmesi, Ankara Üniversitesi, Fen Fakultesi Mecmuasi 2: 146–252 (in Turkish).Google Scholar
  19. Hansson, L. A., H. Annadotter, E. Bergman, S.F. Hamrin, E. Jeppesen, T. Kairesalo, E. Luokkanen, P. A. Nilsson, M. Søndergaard & J. Strand, 1998. Biomanipulation as an application of food-chain theory: costraints, synthesis, and recommendations for temperate lakes. Ecosystems 1: 558–574.Google Scholar
  20. Haslam, S., C. Sinker & P. Wolseley, 1982. British Water Plants. Field studies.Google Scholar
  21. Hrbácek, J., M. Dvoraková, V. Korinek & L. Procházová, 1961. Demostration of the effect of the fish stock on the species composition of zooplankton and the intensity of the metabolism of the whole plankton associated. Verh. int. Ver. Limnol 14: 192–195.Google Scholar
  22. Jeppesen, E., J. P. Jensen, M. Søndergaard, T. L. Lauridsen, L. J. Pedersen & L. Jensen, 1997. Top-down control in freshwater lakes: the role of nutrient state, submerged macrophytes and water depth. Hydrobiologia 342/343: 151–161.Google Scholar
  23. Jeppesen, E., J. P. Jensen, M. Søndergaard, T. L. Lauridsen, 1999.Trophic dynamics in turbid and Clearwater lakes with special emphasis on the role of zooplankton for water clarity. Hydrobiologia 408/409: 217–231.Google Scholar
  24. Jeppesen, E., P. Kristensen, J.P. Jensen, M. Søndergaard, E. Mortensen & T. Lauridsen, 1991. Recovery resilience following a reduction in external phosphorus loading of shallow, eutrophic Danish lakes: duration, regulating factors and methods for overcoming resilience. Mem. Ist. ital. Idrobiol. 48: 127–148.Google Scholar
  25. Jespersen, A-M. & K. Christoffersen, 1987. Measurements of chlorophyll-a from phytoplankton using ethyl alcohol as extraction solvent. Arch. Hydrobiol. 109: 445–454.Google Scholar
  26. Kristensen, P. & H. O. Hansen, 1994. European Rivers and Lakes. Assessment of Their Environmental State. European Environmental Agency, Brussels.Google Scholar
  27. Lauridsen, T. L., E. Jeppesen, E. & F. Ø. Andersen, 1993. Colonisation of submerged macrophytes in shallow fishmanipulated Lake Væng: Impact of sediment composition and waterfowl grazing. Aquat. Bot. 46: 1–15.Google Scholar
  28. Marsden, S., 1989. Lake restoration by reducing external phosphorus loading: the influence of sediment phosphorus release. Freshwat. Biol. 21: 139–162.Google Scholar
  29. Mackereth, F. J. H., J. Heron, & J. F. Talling, 1978. Water Analysis: Some Methods for Limnologists. Freshwater Biological Association Scientific Publication, 36.Google Scholar
  30. McQueen, D. J., J. R. Post & E. L. Mills, 1986. Trophic relationships in freshwater pelagic ecosystems. Can. J. Fish. aquat. Sci. 43: 1571–1581.Google Scholar
  31. Meijer, M.-L., M. W. de Haan, A. W. Breukelaar & H. Buiteveld, 1990. Is reduction of benthivorous fish an important cause of high transparency following biomanipulation in shallow lakes? Hydrobiologia 200/201: 301–315.Google Scholar
  32. Meijer, M-L., I. Boois, M. Scheffer, R. Portielje & H. Hosper, H. 1999. Biomanipulation in shallow lakes in The Netherlands: an evaluation of 18 case studies. Hydrobiologia 408/409: 13–30.Google Scholar
  33. Moss, B., 1998. Ecology of Fresh Waters: Man & Medium, Past to Future, 3rd edn. Blackwell Science, Oxford: 557 pp.Google Scholar
  34. Muluk, Ç., 2001. The Vertical Displacement and Life-History Traits of Daphnia pulex De Geers in Lake Eymir. MSc. Thesis. Middle East Technical University, Ankara.Google Scholar
  35. Reynolds, C. S., 1984. The Ecology of Freshwater Phytoplankton. Cambridge University Press. Cambridge: 384 pp.Google Scholar
  36. Sas, H., 1989. Lake restoration by reduction of nutrient loading: Expectations, Experiences, Extrapolations. St. Augustin 1: Akademia Verl. Richarz. ISBN 3-88345379-X.Google Scholar
  37. Scheffer, M., H. Hosper, M-L. Meijer, B. Moss & E. Jeppesen, 1993. Alternative equilibria in shallow lakes. TREE 8: 275–279.Google Scholar
  38. Schindler, D. W., 1971. Carbon, nitrogen, and phosphorus and the eutrophication of freshwater lakes. J. Phycol. 7: 321–329.Google Scholar
  39. Shapiro, J., V. Lamarra & M. Lynch, 1975. Biomanipulation: an ecosystem approach to lake restoration. In Brezonik, P. L. & J. L. Fox (eds), Proceedings of a Symposium on Water Quality Management through Biological Control: 23–30.Google Scholar
  40. Smith, V. H., 1983. Low nitrogen to phosphorus ratios favour dominance by blue-green algae in lake phytoplankton. Can. J. Fish. aquat. Sci. 43: 1101–1112.Google Scholar
  41. van Donk, E., M. P. Grimm, R. Gulati & J. P. G. Klein Breteler, 1990. Whole-lake food web manipulation as a means to study community interactions in a small ecosystem. Hydrobiologia 200/201: 275–289.Google Scholar
  42. Wetzel, R. G. & G. E. Likens, 1991. Limnological Analyses. 2nd edn. Springer-Verlag, New York: 391 pp.Google Scholar
  43. Zambrano, L., M. Scheffer & M. Martinez-Ramos, 2001. Catastrophic response of lakes to benthivorous fish introduction. OIKOS 94: 344–350.Google Scholar

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • M. Beklioglu
    • 1
  • O. Ince
    • 1
  • I. Tuzun
    • 2
  1. 1.Biology DepartmentMiddle East Technical UniversityAnkaraTurkey
  2. 2.Biology DepartmentKirikkale UniversityYahsihan, KirikkaleTurkey

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