Role hydrology, sewage effluent diversion and fish on mass balance of nutrients in a system of shallow lakes Mogan and Eymir, Turkey

Karapınar, Burcu
In this study, annual total phosphorus (TP) budget and dissolved inorganic nitrogen (DIN) load were constructed for Lakes Mogan and Eymir for the period of eight years from 1997 to 2004 and the period of ten years covering from 1993 to 1995 and 1997 to 2004, respectively. Lake Mogan experienced seasonal and interannual water level fluctuations. Low water level experienced in 2001 led to decrease in the in-lake TP amount whereas 2-fold increase in the in-lake DIN amount was recorded. Also, high hydraulic residence time resulted in high TP and DIN amount in the lake. Increase in hydraulic residence time was due to management of the lake level. It seems that this practice deteriorates the water quality of Lake Mogan. In Lake Eymir, sewage effluent diversion undertaken in 1995 resulted in 2-fold and 11-fold decrease in TP and DIN amounts in the lake, respectively. High biomass of carp and tench were halved through selective removal during 1998-1999. A 2.5-fold and 1.5 fold decrease in the in-lake TP and DIN amounts, respectively, were recorded after the biomanipulation. In low water level years, the in-lake TP increased and the in-lake DIN amounts were high despite the fact that TP and DIN loads via inflows were significantly low. Therefore, the results showed that the in-lake phosphorus and nitrogen amount were controlled by internal processes rather than external loading in the years with low water levels which coincided with the high hydraulic residence times.


Dissolved inorganic nitrogen removal efficiency of the reed beds surrounding lake Mogan using modeling approaches
Gökmen, Mustafa; Beklioğlu, Meryem; Department of Biology (2004)
In this study, yearly and seasonally nitrogen retention dynamics of reed beds surrounding Lake Mogan were investigated by comparing surface aerial nitrogen load and in-lake concentrations. The analyses were performed separately for nitrate-N, ammonium-N and dissolved inorganic nitrogen (sum of nitrate-N and ammonium-N) to reveal differences between them in terms of retention dynamics. 1998, 1999 and 2002 were relatively high-load years in terms of DIN-input to reed beds surrounding Lake Mogan, compared with...
Distribution and abundance of ctenophores, and their zooplankton food in the Black Sea. I. Pleurobrachia pileus
Mutlu, E; Bingel, F (Springer Science and Business Media LLC, 1999-12-01)
The distribution of Pleurobrachia pileus Muller, 1776 in the Black Sea was determined using plankton samples collected above the anoxic zone (maximum of 200 m) in the winter, spring, and summer of 1991 to 1995; The summer samples were collected in 1991 to 1993 (for a previous) and are included in this paper for comparative purposes. High concentrations of P. pileus were found at the northern edges of anticyclonic eddies along the southern coastal regions. The biomass and abundance of P. pileus increased fro...
Ionic composition of precipitation at the Central Anatolia Turkey
Tuncer, Burcu; Bayar, Banu; Canan, Yeşilyurt; Tuncel, Süleyman Gürdal (2001-12-01)
Concentrations of major ions, SO42-, NO3-, Cl-, H+, Ca2+, K+, Mg2+, Ca2+ and conductivity were measured in approximately 300 daily, wet-only rain samples collected at a permanent rural station between 1993 and 1998. Concentrations of anthropogenic ions NH4+, SO42- and NO3- were among the highest values reported in whole EMEP network, suggesting that the Anatolian plateau is under strong influence of distant emission sources. Although transport of pollutants have significant influence on the chemical composi...
Diurnal gut pigment rhythm and metabolic rate of Calanus euxinus in the Black Sea
Besiktepe, S; Svetlichny, L; Yuneva, T; Romanova, Z; Shulman, G (Springer Science and Business Media LLC, 2005-04-01)
The vertical distribution, diel gut pigment content and oxygen consumption of Calanus euxinus were studied in April and September 1995 in the Black Sea. Gut pigment content of C. euxinus females was associated with diel vertical migration of the individuals, and it varied with depth and time. Highest gut pigment content was observed during the nighttime, when females were in the chlorophyll a (chl a) rich surface waters, but significant feeding also occurred in the deep layer. Gut pigment content throughout...
Egg production and growth rates of Calanus euxinus (Copepoda) in the Black Sea
Besiktepe, S; Telli, M (Oxford University Press (OUP), 2004-05-01)
Egg production rates (EPRs) of Calanus euxinus were measured in the Black Sea during October 2000 and May 2001. EPRs were generally low, on average 1.7 eggs female(-1) day(-1) in October 2000 and 3.9 eggs female(-1) day(-1) in May 2001. The relationships between EPRs and gonad maturity, depth-integrated chlorophyll a (Chl a) and mean surface layer temperature were examined. The EPRs were not related to depth-integrated Chl a, but were negatively correlated with temperature. EPRs were strongly related to the...
Citation Formats
B. Karapınar, “Role hydrology, sewage effluent diversion and fish on mass balance of nutrients in a system of shallow lakes Mogan and Eymir, Turkey,” M.S. - Master of Science, Middle East Technical University, 2005.