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The trophic state of a freshwater ecosystem reflects itsenvironmental quality. This is why several trophic indicators have beendeveloped for such water bodies based on chemical, physical and biologicalparameters. Apart from that, there are several biotic elements which can beused in accessing the environmental condition of a freshwater ecosystem.Zooplankton organisms are important elements of the structure and function oflakes and are considered useful indicators of alterations in their trophicdynamics and ecological state related to changes in nutrient loading andclimate. In accordance to the above, the present study is an attempt to assessthe trophic condition of the largest lake in Greece Lake Trichonis throughthe investigation of the physicochemical elements, along with the bioticindications provided by a three-year study of the lake’s zooplankton. Thepresent results, compared with previous studies conducted between 15 and 25years before, showed that there was an increase in the maximum values of theconcentrations of chlorophyll-α and nutrients, while there was a decrease inwater transparency. The implementation of Carslon’s trophic state index TSIrevealed that Lake Trichonis still remains an oligo-to mesotrophic ecosystem asit was in the past. However, although the zooplankton investigation showedseveral features that are common in oligotrophic lakes, there are certaineutrophic characteristics of the zooplankton community e.g. abundancevariation pattern, indicator species, seasonal succession of cladoceranspointing out a different state of the ecosystem in comparison to the past. Inconclusion, the use of a biotic element like zooplankton revealed that LakeTrichonis is experiencing a transitional condition towards the eutrophic stateand points out the necessity for constant inspection and monitoring of thisecosystem. 

KEYWORDS

Lake Zooplankton; Eutrophication; Abundance; Trichonis Lake; Indicator Species; Mediterranean

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.





Autor: George Kehayias, Evangelia Doulka

Fuente: http://www.scirp.org/



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