Comparison of Offshore and River Influenced Coastal Waters in the Eastern Mediterranean

Doğan Sağlamtimur, Neslihan
Tuğrul, Süleyman
Depending on the environmental condition and antropogenic nutrient supply, organic matter production and chemical composition show spatial and temporal variabilities in marine environment. The Eastern Mediterranean is known to be one of the oligotrophic seas, where the surface inorganic phosphate and nitrate concentrations vary in the range of 10 to 20 nM and 0.10 to 0.30 mu M, respectively. Primary production is, therefore, mainly controlled by phosphate. The exceptionally low phosphate concentrations have limited reliable estimates of the N/P (nitrate/phosphate) ratio by traditional measurement methods. In this study, we have used Magnesium induced coprecipitation (MAGIC) technique to measure inorganic phosphate with a sensitivity of 1 nM. Changes in nutrient and hydrographic conditions are monitored at three near-shore stations on Erdemli (Mersin) coastal zone and four off-shore stations in December 2003. Nutrient concentrations in the surface water displayed a strong offshore gradient, decreasing from 0.018 to 0.009 mu M for phosphate; 0.40 to 0.06 mu M for nitrate; 1.76 to 1.69 mu M for reactive silicate towards open sea. On the other hand, deep water concentrations exhibited an opposite trend; phosphate rises from 0.024 to 0.214 mu M, nitrate from 0.35 to 5.52 mu M, reactive silicate from 1.77 to 13.78 mu M in the region.


Spatial and Temporal Variations of Inorganic and Organic Forms of Phosphorus in the Surface and Deep Waters of Erdemli Shelf Zone of Mersin Bay
DOĞAN SAĞLAMTİMUR, NESLİHAN; Tuğrul, Süleyman (2013-01-01)
The aim of this study was to understand spatial and temporal variations of inorganic and organic forms of phosphorus in the surface and deep waters of Erdemli shelf zone of the Mersin Bay. For this goal, timeseries hydrographical and phosphorus data were obtained monthly at the three selected stations between December 2001 and December 2003. The present results have shown that the concentrations of different fractions of total phosphorus displayed a decreasing trend from nearshore to shelfbreak zone of the ...
Comparison of regression and kriging techniques for mapping the average annual precipitation of Turkey
Bostan, P.A.; Heuvelink, G.B.M.; Akyürek, Sevda Zuhal (Elsevier BV, 2012-10)
Accurate mapping of the spatial distribution of annual precipitation is important for many applications in hydrology, climatology, agronomy, ecology and other environmental sciences. In this study, we compared five different statistical methods to predict spatially the average annual precipitation of Turkey using point observations of annual precipitation at meteorological stations and spatially exhaustive covariate data (i.e. elevation, aspect, surface roughness, distance to coast, land use and eco-region)...
Warming Effects on Periphyton Community and Abundance in Different Seasons Are Influenced by Nutrient State and Plant Type: A Shallow Lake Mesocosm Study
Hao, Beibei; Wu, Haoping; Zhen, Wei; Jo, Hyunbin; Cai, Yanpeng; Jeppesen, Erik; Li, Wei (Frontiers Media SA, 2020-4-9)
Periphyton plays an important role in lake ecosystems processes, especially at low and intermediate nutrient levels where periphyton contribution to primary production can be similar to or exceed that of phytoplankton. Knowledge of how periphyton responds to key drivers such as climate change and nutrient enrichment is, therefore, crucial. We conducted a series of mesocosm experiments over four seasons to elucidate the responses of periphyton communities to nutrient (low and high, TN-0.33 mg L-1 TP-7.1 mu g...
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The Eastern Mediterranean and its Cilician Basin offshore waters have oligotrophic features with low nutrient concentrations, low primary production, and high water transparency. However, the wide shelf area of the Cilician Basin is subject to contaminated river inflows with enhanced nutrient loads and direct discharges of urban wastewaters of southern Turkey, leading to develop local eutrophic/mesotrophic conditions in the inner sites of Mersin and Iskenderun Bays on the Cilician Basin. For the assessment ...
Yilmaz, Elif; Salihoğlu, Barış; Department of Oceanography (2016-10-12)
Three areas of different ecosystem characteristics in the Northern Levantine Basin is compared using a 1-D multicomponent lower trophic level ecosystem model developed by SALIHOĞLU, B. et al. (2009) (NAGEM). Main focus was to analyze and compare the carrying capacity (PP) and regulatory mechanisms of the nutrients on lower trophic levels. 26 years’ of historical data obtained from METU-IMS data inventory and CORIOLIS was used to form a climatology, to introduce boundary conditions to the model as well as to...
Citation Formats
N. Doğan Sağlamtimur and S. Tuğrul, “Comparison of Offshore and River Influenced Coastal Waters in the Eastern Mediterranean,” Ekoloji, pp. 17–23, 2008, Accessed: 00, 2020. [Online]. Available: