Assessment and classification of water quality using different water quality indices in the coastal waters of Eastern Aegean Sea




Seawater Quality Index, Ecological Index, Physico-Chemical Variables, Anthropogenic Activities, TRIX, Eastern Aegean Sea


The water quality monitoring in coastal areas of Aegean Sea interpreted through indices provides easy to understand and simple information for coastal managers and the general public. The Coastal Water Quality Index (CWQI) synthesizes the status of the eight water quality indicators such as chlorophyll a, total nitrogen, ammonium, nitrate+nitrite, total phosphorus, pH, dissolved oxygen; and fecal coliform into a single indicator of water quality. The CWQI compares measured variables to standard values. Seawater samples at 14 sampling points between 2014 and 2015 from Güllük Bay, Akköy and Ildır Bay of the Aegean Sea (eastern Mediterranean), have been analyzed seasonally in the current study. Investigation of environmental parameters demonstrated unsuitable water quality in some stations from Güllük Bay and Akköy. The anthropogenic inputs may be the likely reason for unsuitable water quality. However, generally good water quality was observed at Ildır stations indicating suitability of those areas for human activities like recreation. Furthermore, fecal contamination risk was detected at some stations in Akköy and Ildır.


Anderson, D. M., Glibert, P. M., & Burkholder, J. M. (2002). Harmful algal blooms and eutrophication: nutrient sources, composition and consequences. Estuaries, 25, 704–726.

Anonymous. (2003). In: Thailand state pollution report. Pollution Control Department p. 28.

APHA (American Public Health Association)-AWWA-WPCF. (1980). Standard methods for the examination of water and wastewater. (5th ed.) American Public Health Association, Inc. Washington, D.C. 1200 p.

APHA. (1998). Standard Methods for the examination of water and waste water. (19th ed.) American Public Health Association, Washington DC, 874 p.

Aydin-Onen, S., Kocak, F., & Kucuksezgin, F. (2012). Evaluation of spatial and temporal variations of inorganic nutrient species in the eastern Aegean Sea waters. Marine Pollution Bulletin, 64(12), 2849–2856.

Bengil, F. (2011). Determination of the impacts of marine farms on marine ecosystems by using remote sensing: Ildırı Bay. Master Thesis Submitted to the Graduate School of Natural and Applied Sciences of Dokuz Eylul University, 121p.

Brown, R. M., McClelland, N. I., Deininger, R. A., & O’Connor, M.F. (1972). A Water Quality Index-Crashing the Psychological Barrier. In: Thomas W A, Eds. Indicators of Environmental Quality. Environmental Science Research, 1, Springer, Boston, MA. Plenum Press.

Chigbu, P., Gordon, S., & Strange, T. (2004). Influence of inter-annual variations in climatic factors on fecal coliform levels in Mississippi Sound. Water Research, 38, 4341–4352.

COMAPS. (2012). Monitoring of Marine Pollution through Coastal Ocean Monitoring and Prediction System. ICMAM PD, Ministry of Earth Sciences, Govt. of India.

Crowther, J., Kay, D., & Wyer, M. D. (2002). Faecal-indicator concentrations in waters draining lowland pastoral catchments in the UK: relationships with land use and farming practices. Water Research, 36(7), 1725–1734.

Cude, C. (2001). Oregon Water Quality Index: a tool for evaluating water quality management effectiveness. The Journal of the American Water Resources Association, 37(1), 125–137.

Dennison, W. C., Orth, R. J., Moore, K. A., Stevenson, J. C., Carter, V., Kollar, S., Bergstrom, P. W., & Batiuk, R. A. (1993). Assessing water quality with submersed aquatic vegetation: Habitat requirements as barometers of Chesapeake Bay health. Bioscience, 43(2), 86–94.

Gupta, A. K., Gupta, S. K., & Patil, R. S. (2003). A comparison of water quality indices for coastal water. Journal of Environmental Science and Health, Part A, 38(11), 2711–2725.

Horton, R. K. (1965). An index number systemfor rating water quality. Journal of the Water Pollution Control Federation, 37(3), 300–306. teexjx455qlt3d2q))/reference/ReferencesPapers.aspx?ReferenceID=1020268

Hulya, B. (2009). Utilization of the water quality index method as a classification tool. Environmental Monitoring and Assessment, 167, 115–124. s10661-009-1035-1

IMST-165. (2009). MED-POL IV Long term biomonitoring, trend and compliance monitoring programme in coastal areas from Aegean, Northeastern Mediterranean and monitoring eutrophication of Mersin Bay Project Final Report, Ministry of Environment and Forestry, Turkey.

Jagadeeswari, P. B., & Ramesh, K. (2012). Water quality index for assessment of water quality in South Chennai Coastal Aquifer, Tamil Nadu, India. International Journal of ChemTech Research, 4(4), 1582–1588. /20123390644

Johnson, D. L., Ambrose, S. H., Bassett, T. J., Bowen, M. L., Crummey, D. E., Isaacson, J. S., Johnson, D. N., Lamb, P., Saul, M., & Winter-Nelson, A. E. (1997). Meanings of environmental terms. Journal of Environmental Quality, 26(3), 581–589.

Jones, A., Carruthers, T., Pantus, F., Thomas, J., Saxby, T., & Dennison, W. (2004). A water quality assessment of the Maryland Coastal Bays including nitrogen source identification using stable isotopes. Report on Maryland Coastal Bays Program, 60p.

Kacar, A. (2011). Analysis of spatial and temporal variation in the levels of microbial fecal indicators in the major rivers flowing into the Aegean Sea, Turkey. Ecological Indicators, 11, 1360–1365.

Kalkan, S., & Altug, G. (2015). Bio-indicator bacteria & environmental variables of the coastal zones: The example of the Güllük Bay, Aegean Sea, Turkey. Marine Pollution Bulletin, 95, 380–384.

Kelsey, H., Porter, D. E., Scott, G., Neet, M., & White, D. (2004). Using geographic information systems and regression analysis to evaluate relationships between land use and fecal coliform bacterial pollution. Journal of Experimental Marine Biology and Ecology, 298, 197–209.

Kim, G., Choib, E. & Lee, D. (2005). Diffuse and point pollution impacts on the pathogen indicator organism level in the Geum River, Korea. Science of the Total Environment, 350, 94–105.

Kontas, A., Kucuksezgin, F., Altay, O., & Uluturhan, E. (2004). Monitoring of eutrophication and nutrient limitation in the Izmir Bay (Turkey) before and after wastewater treatment plant. Environment International, 29(8), 1057–1062.

Kucuksezgin, F., Balci, A., Kontas, A., & Altay, O. (1995). Distribution of nutrients and chlorophyll-a in the Aegean Sea. Oceanologica Acta, 18(3), 343–352.

Kucuksezgin, F., Kontas, A., Altay, O., & Uluturhan, E. (2005). Elemental composition of particulate matter and nutrient dynamics in the Izmir Bay (Eastern Aegean). Journal of Marine Systems, 56(1-2), 67–84.

Kucuksezgin, F., Gonul, L. T., Pazi, I., & Kacar, A. (2019). Assessment of seasonal and spatial variation of surface water quality: Recognition of environmental variables and fecal indicator bacteria of the coastal zones of Izmir Bay, Eastern Aegean. Regional Studies in Marine Science, 28, 100554.

Mahuya, D. G. A., Purohit, K. M., & Datta, J. (2001). Assessment of drinking water quality of river Brahmani. Indian Journal of Environmental Protection, 8, 285–291. Retrieved January, 2001, from water_quality_of_river_Brahmani

MSFD. (2010). Directive 2008/56/EC of the European Parliament and of the Council of 17 June 2008 establishing a framework for community action in the field of marine environmental policy. Retrieved June 25, 2008, from

Orpin, A. R., Ridd, P. V., Thomas, S., Anthony, K. R. N., Marshall, P., & Oliver, J. (2004). Natural turbidity variability and weather forecasts in risk management of anthropogenic sediment discharge near sensitive environments. Marine Pollution Bulletin, 49(7-8), 602–612.

Özdemir, N., Tarkan, A. S., & Top, N. D. (2013). Günümüzde Güllük Lagünü’nde Yaşanan çevresel sorunlar üzerine bir araştırma. Güllük Körfezi Bakteriyolojisi TÜBİTAK Proje Çalıştayı (G. Altuğ Ed.), Güllük, Muğla: 43–49.

Pagou, K., Siokou-Frangou, I., & Papathanassiou, E. (2002). Nutrients and their ratios in relation to eutrophication and HAB occurrence. In: The Case of Eastern Mediterranean Coastal Waters Second Workshop on Thresholds of Environmental Sustainability: The Case of Nutrients, 18–19 2002, Brussels, Belgium.

Pavlidou, A., Simbour, N., Rousselaki, E., Tsapakis, M., Pagou, K., Drakopoulou, P., Assimakopoulou, G., Kontoyiannis, H., & Panayotidis, P. (2015). Methods of eutrophication assessment in the context of the water framework directive: Examples from the Eastern Mediterranean coastal areas. Continental Shelf Research, 108, 156–168.

Primpas, I., Tsirtsis, G., Karydis, M., & Kokkoris, G. (2010). Principal component analysis: Development of a multivariate index for assessing eutrophication according to the European water framework directive. Ecological Indicators, 10(2), 178–183.

Sanchez, E., Colmenarejo, M. F., Vicente, J., Rubio, A., García, M. G., Travieso, L., & Borja, R. (2007). Use of the water quality index and dissolved oxygen deficit as simple indicators of watersheds pollution. Ecological Indicators, 7(2), 315–328. /j.ecolind.2006.02.005

Shahidul, I., & Tanaka, M. (2004). Impacts of pollution on coastal and marine ecosystems including coastal and marine fisheries and approach for management: a review and synthesis. Marine Pollution Bulletin, 48, 624–649. /j.marpolbul.2003.12.004

Simboura, N., Panayotidis, P., & Papathanassiou, E. (2005). A synthesis of the biological quality elements for the implementation of the European Water Framework Directive in the Mediterranean ecoregion: the case of Saronikos Gulf. Ecological Indicators, 5, 253–266.

Stevenson, J. C., Staver, L. W., & Staver, K. W. (1993). Water quality associated with survival of submersed aquatic vegetation along an estuarine gradient. Estuaries, 16(2), 346–361.

Strickland, J. D. H., & Parsons, T. R. (1972). A Practical Handbook of Seawater Analysis, second ed. In: Bulletin, vol. 167, Fisheries Research Board of Canada Ottawa, 310p. Retrieved from

The Official Gazette. (2006). Directive 2006/7/EC of the European Parliament and of the Council of 15 February 2006 concerning the management of bathing water quality and repealing Directive 76/160/EEC (OJ L 64, 4.3.2006, pp. 37–51. Retrieved June 7, 2017, from &from=GA

The Official Gazette. (2012). Surface Water Quality Regulation, No:28483, 30.11.2012.

USEPA (Environmental Protection Agency). (1986). EPA's Ambient Water Quality Criteria for Bacteria (Washington, DC. EPA440/5-84-002). /files/2019-03/documents/ambient-wqc-bacteria-1986.pdf

Yucel-Gier, G., Kucuksezgin, F., & Kocak, F. (2007). Effects of fish farming on nutrients and benthic community structure 3in the Eastern Aegean (Turkey). Aquaculture Research, 38(3), 256–267.

Yucel-Gier, G., Arisoy, Y., & Pazi, I. (2010). A spatial analysis of fish farming in the context of ICZM in the Bay of Izmir-Turkey. Coastal Management, 38(4), 399–411.

Yucel-Gier, G., Kacar, A., Gonul, L. T., Pazi, I., Kucuksezgin, F., Erarslanoglu, N., & Toker, S. K. (2018). Evaluation of the relationship of picoplankton and viruses to environmental variables in a lagoon system (Çakalburnu Lagoon, Turkey). Chemistry and Ecology, 34(3), 211–228.




How to Cite

Gönül, T., Kaçar, A., Küçüksezgin, F., & Pazı, İdil. (2023). Assessment and classification of water quality using different water quality indices in the coastal waters of Eastern Aegean Sea . Sustainable Aquatic Research, 2(1), 51–73.



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