JEP  Vol.5 No.1 , January 2014
Trophic State Evaluation of a Large Mediterranean Lake Utilizing Abiotic and Biotic Elements

The trophic state of a freshwater ecosystem reflects its environmental quality. This is why several trophic indicators have been developed for such water bodies based on chemical, physical and biological parameters. Apart from that, there are several biotic elements which can be used in accessing the environmental condition of a freshwater ecosystem. Zooplankton organisms are important elements of the structure and function of lakes and are considered useful indicators of alterations in their trophic dynamics and ecological state related to changes in nutrient loading and climate. In accordance to the above, the present study is an attempt to assess the trophic condition of the largest lake in Greece (Lake Trichonis) through the investigation of the physicochemical elements, along with the biotic indications provided by a three-year study of the lake’s zooplankton. The present results, compared with previous studies conducted between 15 and 25 years before, showed that there was an increase in the maximum values of the concentrations of chlorophyll-α and nutrients, while there was a decrease in water transparency. The implementation of Carslon’s trophic state index (TSI) revealed that Lake Trichonis still remains an oligo-to mesotrophic ecosystem as it was in the past. However, although the zooplankton investigation showed several features that are common in oligotrophic lakes, there are certain eutrophic characteristics of the zooplankton community (e.g. abundance variation pattern, indicator species, seasonal succession of cladocerans) pointing out a different state of the ecosystem in comparison to the past. In conclusion, the use of a biotic element like zooplankton revealed that Lake Trichonis is experiencing a transitional condition towards the eutrophic state and points out the necessity for constant inspection and monitoring of this ecosystem. 

Cite this paper: G. Kehayias and E. Doulka, "Trophic State Evaluation of a Large Mediterranean Lake Utilizing Abiotic and Biotic Elements," Journal of Environmental Protection, Vol. 5 No. 1, 2014, pp. 17-28. doi: 10.4236/jep.2014.51003.

[1]   I. Bertahas, E. Dimitriou, I. Karaouzas, S. Laschou and I. Zacharias, “Climate Change and Agricultural Pollution Effects on the Trophic Status of a Mediterranean Lake,” Acta Hydrochimica et Hydrobiologica, Vol. 34, No. 4, 2006, pp. 349-359.

[2]   R. E. Carlson, “A Trophic State Index for Lakes,” Limnology and Oceanography, Vol. 22, No. 2, 1977, pp. 361-369.

[3]   R. C. Bailey, R. H. Norris and T. B. Reynoldson, “Bioassessment of Freshwater Ecosystems: Using the Reference Condition Approach,” Kluwer Academic Publishers, Dordrecht, 2004.

[4]   W. Lampert and U. Sommer, “Limnoecology—The Ecology of Lakes and Streams,” Oxford University Press, Oxford, 1997.

[5]   R. Caroni and K. Irvine, “The Potential of Zooplankton Communities for Ecological Assessment of Lakes: Redundant Concept or Political Oversight?” Biology and Environment: Proceedings of the Royal Irish Academy, Vol. 110, No. 1, 2010, pp. 35-53.

[6]   E. Jeppesen, P. Noges, T. A. Davidson, J. Haberman, T. Noges, K. Blank, T. L. Lauridsen, M. Søndergaard, C. Sayer, R. Laugaste, L. S. Johansson, R. Bjerring and S. L. Amsinck, “Zooplankton as Indicators in Lakes: A Scientific-Based Plea for Including Zooplankton in the Ecological Quality Assessment of lakes according to the European Water Framework Directive (WFD),” Hydrobiologia, Vol. 676, No. 1, 2011, pp. 279-297.

[7]   I. Zacharias, E. Dimitriou and T. Koussouris, “Integrated Water Management Scenarios for Wetland Protection: Application in Trichonis Lake,” Environmental Modelling and Software, Vol. 20, No. 2, 2005, pp. 177-185.

[8]   E. Doulka, “Contribution to the Study of the Zooplankton Community of Lake Trichonis (Greece),” Ph.D. Dissertation, University of Ioannina, Agrinio, 2010.

[9]   J. Overbeck, K. Anagnostidis and A. Economou-Amilli, “A Limnological Survey of three Greek Lakes: Trichonis, Lysimachia and Amvrakia,” Archiv für Hydrobiologie, Vol. 95, No. 1-4, 1982, pp. 365-394.

[10]   T. Koussouris, I. Bertahas, A. Diapoulis, V. Pakos and K. Gritzalis, “Limnological and Hydrobiological Characteristics of Lake Trichonis,” In: Daoulas, C., Ed., Limnological, Ichthyological and Fisheries Investigation of Lake Trichonis, NCMR Technical Report (TEE/144), Athens, 1993, pp. 1-37.

[11]   T. Tafas, D. Danielidis, J. Overbeck and A. Economou-Amilli, “Limnological Survey of the Warm Monomictic Lake Trichonis (Central Western Greece). I. The Physical and Chemical Environment,” Hydrobiologia, Vol. 344, No. 1-3, 1997, pp. 129-139.

[12]   G. Kehayias, E. Michaloudi and A. Bexi, “Aspects on the Seasonal Dynamics and the Vertical Distribution of the Crustacean Zooplankton Community and the Dreissena polymorpha Larvae in Lake Trichonis,” Mediterranean Marine Science, Vol. 5, No. 1, 2004, pp. 5-17.

[13]   E. Doulka and G. Kehayias, “Spatial and Temporal Distribution of Zooplankton in Lake Trichonis (Greece),” Journal of Natural History, Vol. 42, No. 5-8, 2008, pp. 575-595.

[14]   APHA, AWWA and WPCF, “Standard Methods for the Examination of Water and Wastewater,” American Public Health Association, Washington DC, 1998.

[15]   V. M. Rylov, “Fauna of USSR. Crustacea. Freshwater Cyclopoida,” Smithsonian Institution and National Science Foundation, Washington DC, 1963.

[16]   A. Ruttner-Kolisko, “Plankton Rotifers. Biology Taxonomy,” E. Schweizerbart’sche Verlagsbuchhandlung, Stuttgart, 1974.

[17]   N. M. Korovchinsky, “Sididae and Holopediidae: (Crustacea: Daphniiphormes),” In: H. J. F. Dumont, Ed., Guide to the Identification of the Microinvertebrates of the Continental Waters of the Word, SPB Academic Publishing, The Hague, 1992, pp. 1-82.

[18]   M. Alonso, “Crustacea. Brachionopoda. Serie Fauna Ibérica,” Museo Nacional de Ciencias Naturales, CSIC, Madrid, 1996.

[19]   J. A. H. Benzie, “Cladocerans: The Genus Daphnia (Including Daphniopsis),” In: Dumont, H. J. F., Ed., Guide to the Identification of the Microinvertebrates of the Continental Waters of the World, Vol. 21, Backhuys Publishers, Leiden, 2005, pp. 1-376.

[20]   R. G. Wetzel, “Limnology. Lake and River Ecosystems,” 3rd Edition, Academic Press, San Diego, 2001.

[21]   I. Zacharias and G. Ferentinos, “A Numerical Model for the Winter Circulation in Lake Trichonis, Greece,” Environmental Modelling and Software, Vol. 12, No. 4, 1997, pp. 311-321.

[22]   S. Stankovic, “The Balcan lake of Ohrid and Its Living World,” Uitgeverijdr. W. Junk, Den Haag, 1960.

[23]   I. Tsekos, P. S. Economidis, S. Charitonidis, A. Sinis, G. Nikolaides, D. Petridis, M. Moustaka, M. Zarfdjian and A. Kokkinakis, “Hydrobiological Study of the Man-Made Lake Tavropou, Karditsa,”Final Report, Greek Ministry of Agriculture, Athens, 1992.

[24]   O. Ferrara, D. Vagaggini and F. G. Margaritora, “Zooplankton Abundance and Diversity in Lake Bracciano, Latium, Italy,” Journal of Limnology, Vol. 61, No. 2, 2002, pp. 169-175.

[25]   M. H. Zarfdjian, “Seasonal Variation and Spatial Distribution of Planktonic Invertebrates in Lake Volvi (Macedonia, Greece),” Ph.D. Dissertation, Aristotle University, Thessaloniki, 1989.

[26]   E. Michaloudi, M. Zarfdjian and P. S. Economidis, “The Zooplankton of Lake Mikri Prespa,” Hydrobiologia, Vol. 351, No. 1-3, 1997, pp. 77-94.

[27]   J. R. Romero, I. Kagalou, J. Imberger, D. Hela, M. Kotti, A. Bartzokas, T. Albanis, N. Evmirides, S. Karkabounas, J. Papagiannis and A. Bithava, “Seasonal Water Quality of Shallow and Eutrophic Lake Pamvotis, Greece: Implications for Restoration,” Hydrobiologia, Vol. 474, No. 1-3, 2002, pp. 91-105.

[28]   E. Chalkia and G. Kehayias, “Zooplankton and Environmental Factors of a Recovering Eutrophic Lake (Lysimachia Lake, Western Greece),” Biologia, Vol. 68, No. 3, 2013, pp. 459-469.

[29]   E. Chalkia, I. Zacharias, A-A. Thomatou and G. Kehayias, “Zooplankton Dynamics in a Gypsum Karst Lake and Interrelation with the Abiotic Environment,” Biologia, Vol. 67, No. 1, 2012, pp. 151-163.

[30]   U. Sommer, Z. M. Gliwicz, W. Lampert and A. Duncan, “The PEG-Model of Seasonal Succession of Planktonic Events in Fresh Water,” Archiv für Hydrobiologie, Vol. 106, No. 4, 1986, pp. 433-471.

[31]   P. E. Sager and S. Richman, “Functional Interaction of Phytoplankton and Zooplankton along the Trophic Gradient in Green Bay, Lake Michigan,” Canadian Journal of Fisheries and Aquatic Sciences, Vol. 48, No. 1, 1991, pp. 116-122.

[32]   J. J. Elser and C. R. Goldman, “Zooplankton Effects on Phytoplankton in Lakes of Contrasting Trophic Status,” Limnology and Oceanography, Vol. 36, No. 1, 1991, pp. 64-90.

[33]   G. Maier, “Copepods Communities in Lakes of Varying Trophy Degree,” Archiv für Hydrobiologie, Vol. 136, No. 4, 1996, pp. 455-465.

[34]   R. Pinto-Coelho, B. Pinel-Alloul, G. Méthot and K. E. Havens, “Crustacean Zooplankton in Lakes and Reservoirs of Temperate and Tropical Regions: Variation with Trophic Status,” Canadian Journal of Fisheries and Aquatic Sciences, Vol. 62, No. 2, 2005, pp. 348-361.

[35]   W. Geller and H. Müller, “Seasonal Variability in the Relationship between Body Length and Individual Dry Weight as Related to Food abundances and Clutch Size in Two Coexisting Daphnia Species,” Journal of Plankton Research, Vol. 7, No. 1, 1985, pp. 1-18.

[36]   J. E. Gannon and R. S. Stemberger, “Zooplankton (Especially Crustaceans and Rotifers) as Indicators of Water Quality,” Transactions of American Microscopy Society, Vol. 97, No. 1, 1978, pp. 16-35.

[37]   A. Maemets, “Rotifers as Indicators of Lakes Types in Estonia,” Hydrobiologia, Vol. 104, No. 1, 1983, pp. 357-361.

[38]   B. Pejler, “Zooplanktonic Indicators of Trophy and Their Food,” Hydrobiologia, Vol. 101, No. 1-2, 1983, pp. 111-114.

[39]   Z. M. Gliwicz and W. Lampert, “Food Thresholds in Daphnia Species in the Absence and Presence of Blue-Green Filaments,” Ecology, Vol. 71, No. 2, 1990, pp. 691-702.

[40]   T. Koussouris, “Plankton Observations in Three Lakes of Western Greece,” Thalassographica, Vol. 2, No. 1, 1978, pp. 115-123.

[41]   T. Koussouris, “Dominating Planktonic Rotatoria in Some Lakes of Western Greece,” Biologia Gallo-Hellenica, Vol. 12, No. 1, 1979, pp. 135-140.

[42]   E. Doulka, G. Kehayias, E. Chalkia and I. Leonardos, “Feeding Strategies of Atherina boyeri (Risso 1810) in a Freshwater Ecosystem,” Journal of Applied Ichthyology, Vol. 29, No. 1, 2013, pp. 200-207.

[43]   E. Dimitriou, I. Zacharias and T. Koussouris, “Study for the Water Balance of Trichonis Lake Catchments,” In: Zacharias, I. and Koussouris, T., Eds., Actions for the Protection of Calcareous Bogs/Fens in Trichonis Lake, Technical Report, NCMR/IIW, Athens, 2001, pp. 1-111.

[44]   A-A. Thomatou, M. Triantafyllidou, E. Chalkia, G. Kehayias, I. Konstantinou and I. Zacharias, “Land Use Changes Do Not Rapidly Change the Trophic State of a Deep Lake. Amvrakia Lake, Greece,” Journal of Environmental Protection, Vol. 4, No. 5, 2013, pp. 426-434.