Changes of Eutrofication Indicator Parameters (TP, DIN, Chl-a and TRIX) in the Cilician Basin (Northeast Mediterranean)

Uysal, Zahit
Erdogan, Emine
Yucel, Nebil
Eutrophication processes and changes in coastal ecosystem are determined by the coastal/open sea interactions and rates of nutrient pollution. The Cilician Basin shelf waters are affected not only by intense industrial activities and increased population, but also by complex atmosphere-sea-land interactions. There is a recognizable difference between water qualities of Mersin bay coastal and the Cilician open waters depleted in nutrients. Eutrophic conditions have developed in the eastern bay shallow waters heavily polluted by land-based inputs during the last few decades. In the present study, basic chemical parameters measured seasonally in water column during the 8 field surveys, as a part of TUBITAK project, in the period of November 2005-September 2007, have been evaluated. Cilician coastal waters were always poor in reactive phosphate (0.02-0.05 mu M) throughout the year. However, there is a distinct decrease and seasonal changes in total phosphorus (TP) levels from the polluted inner bay (0.15-0.20 mu M) to the Cilician open waters (0.05-0.07 mu M). The surface TRIX index values, computed from % dissolved oxygen saturation, dissolved inorganic nitrogen, TP and chlorophyll-a concentrations, increase from <2 (oligotrophic property) in the Cilicial open water to levels of 3-6 in the pollutted coastal zone. In the shallow zone between Mersin Harbour and Seyhan delta, where large amounts of nutrients are discharged and TRIX values consistently >4 (showing tendency from mesotrophic to eutrophic propery), biomass level is high and the Secchi Disc depth varies between 1.5-3 meters.


Formation of Zn- and Fe-sulfides near hydrothermal vents at the Eastern Lau Spreading Center: implications for sulfide bioavailability to chemoautotrophs
Hsu-Kim, Heileen; Mullaugh, Katherine M.; Tsang, Jeffrey J.; Yücel, Mustafa; Luther, George W. (2008-05-19)
Background: The speciation of dissolved sulfide in the water immediately surrounding deep-ocean hydrothermal vents is critical to chemoautotrophic organisms that are the primary producers of these ecosystems. The objective of this research was to identify the role of Zn and Fe for controlling the speciation of sulfide in the hydrothermal vent fields at the Eastern Lau Spreading Center (ELSC) in the southern Pacific Ocean. Compared to other well-studied hydrothermal systems in the Pacific, the ELSC is notabl...
Variation in growth, reproduction, and resource allocation in an aquatic plant,Vallisneria spinulosa: the influence of amplitude and frequency of water level fluctuations
Li, Lei; Ding, Mingming; Jeppesen, Erik (Springer Science and Business Media LLC, 2020-09-01)
Water level fluctuations (WLF), one of the most affected ecological drivers by climate change, are dominant forces controlling submerged macrophyte performance and distribution in freshwater ecosystems. Submerged macrophytes are prominent components of shallow lakes, predicting their response to WLF is therefore crucial for the management and conservation of these valuable and vulnerable ecosystems. We conducted an experiment in 15 outdoor mesocosms to explore the influence of WLF on the performance ofValli...
Patterns of Seasonal Stability of Lake Phytoplankton Mediated by Resource and Grazer Control During Two Decades of Re-oligotrophication
Fu, Hui; Yuan, Guixiang; Özkan, Korhan; Johansson, Liselotter Sander; Sondergaard, Martin; Lauridsen, Torben L.; Jeppesen, Erik (Springer Science and Business Media LLC, 2020-09-01)
Human-induced changes in external nutrient loading affect the phytoplankton community and abundance directly by changing the amount of nutrients available, but also indirectly through changes in the zooplankton (that is, grazer) community structure, mediated in part by changes in the fish community structure and biomass. Such shifts affect the species dynamics and community succession of lake phytoplankton communities, and they may ultimately influence community stability. However, the relative importance o...
Development of pollution indices for the middle section of the Lower Seyhan Basin (Turkey)
GÖLGE, Mehmet; YENİLMEZ, Firdes; Aksoy, Ayşegül (2013-06-01)
Pollution indices aggregate concentrations of several water or air quality parameters into a single quantity to indicate the general status of pollution in a region. Several pollution index models are present in literature. However, their application for different cases may require modifications based on implementation goals and available data. In this study, modified pollution indices were used to evaluate the pollution status in the middle section of the Lower Seyhan River Basin by employing a geographica...
Application of the bentix index in assessing ecological quality of hard substrata: a case study from the Bosphorus Strait, Turkey
KALKAN, E.; KARHAN, S.U.; MUTLU, E.; SIMBOURA, N.; BEKOLET, M. (National Documentation Centre (EKT), 2007-6-1)
In this paper, a biotic index (Bentix) has been used for the assessment of ecological quality status of shallow water hard substrate benthic ecosystems affected by coastal sewage discharges in the Bosphorus Strait. A significant difference was observed between the control and the discharge stations with regard to Bentix values (Mann-Whitney U Test, p=0.002) and ecological quality status of the discharge stations was worse than that of controls. The index values revealed that sewage discharges caused ser...
Citation Formats
S. TUĞRUL, Z. Uysal, E. Erdogan, and N. Yucel, “Changes of Eutrofication Indicator Parameters (TP, DIN, Chl-a and TRIX) in the Cilician Basin (Northeast Mediterranean),” EKOLOJI, pp. 33–41, 2011, Accessed: 00, 2020. [Online]. Available: