Effects of Wastewater Treatment Plant on Water Column and Sediment Quality in Izmir Bay (Eastearn Aegean Sea)

WOS: 00038516170001

Investigations on the growth kinetics of <i style="">hantzschia amphioxys</i> homa lagoon by izmir bay (Aegean Sea)

522-528zschia amphioxys were investigated under continuous-light period and batch culture conditions. The optimum temperature and light intensities were found as 18°C and 52 µmol/m2s (saturasyon light), respectively. µmax and Ks values estimated for each nutrient were obtained as follows: ammonia for 1.528 day-1 2.959 µg-at- NH4+-N/L, nitrate 1.22 day-1, 7.01 µg-at NO3- -N/L, phosphate 1.767 and 1.172 day-1 5.07 and 0.460 µg-at PO4-3-P/L, silicate 1.141 day-1 and 0,499 µg-at Si/L. Carrying capacity values estimated for each nutrients were obtained as follows: nitrate 113,7 µg chl a/L , 190.11 phosphate 113.7 µg chl a/L, 1.798. Nitrogen limiting nutrients was found as in this study

Microplankton growth in response to nutrient enrichments in Gerence Bay, Izmir, Western Turkey

WOS: 000330928000005Present study is to. assess the comparative effects of nutrient enrichment within Gerence Bay such a semi-enclosed bay in the Aegean Sea. Water samples were taken in spring seasons (April 2006-2007) and autumn seasons (October 2005-2006) and enriched with nutrients of various concentrations. By applying T test to determine statistical differences between the averages of growth rate. While no difference at the 0.05 level of relevance was observed between the October periods, it was seen that the growth rates of NH4+ NO3- and PO4-3 for the April periods were different (tc=6.62, 9.69, 5.2; df= 19, 18,17 respectively). A season-based study of the growth rates across time, these were higher than 3 (1/day) in October and lower than 2 in the month of April. Experiments show that the environment may exhibit eutrophic sea conditions in the case of certain nutrients, but characteristics of an oligotrophic environment in the case of others. Consequently, it would be more apt to say that Gerence Bay exhibits intermediate character attributes known to define what is called a mesotrophic environment

Bioaccumulation of Cadmium in Marine Diatom: Thalassiosira allenii Takano

WOS: 000339166300010The present study achieved cadmium bioaccumulation ability using growth kinetics and ICP-OES for Cd measurements in marine diatom Thalassiosira allenii Takano. T. allenii cells were exposed to different cadmium concentrations (0.5, 1, 2, 5, 10, 25, 50, 75, and 100 mg. Cd L-1) for 4 days. T. allenii cells were seen to have bioaccumulation ability both in cells and cellular surfaces. The cadmium uptake of T. allenii species followed a linear trend for most of days for 25 mg L-1Cd. T. allenii removed much of cadmium by taking it into the cells in <= 10 mg. L-1 Cd concentrations in the medium. While the adsorption on the cell surfaces is dominant in cells on the first day, the amount of Cd allowed in the cell has become dominant beginning with the second day. The growth rate decreased with increasing Cd concentration and remained stable at about 0.1-0.2 day(-1). However up to the 5 mg. L-1 Cd concentration, the growth rates are not different from the control and continued for about 0.3-0.4 day(-1). When T. allenii species is used in the bioremediation systems, this limit value does not affect growth of the species.Ege University Scientific Research Projects Funds (BAP) TurkeyEge University [07-SUF-021]We thank Directorate of Kirklareli Ataturk Soil, Water and Agricultural Meteorological Station, especially to Dr. M. Ali GURBUZ, for their assistance in ICP-MS analysis. This study was suported by Ege University Scientific Research Projects Funds (BAP Project No: 07-SUF-021) Turkey

Effects of light, temperature, nutrients and salinity on the growth of Cylindrotheca closterium (Ehrenberg) Reimann & J. Lewin, 1964 species isolated from Izmir Bay

WOS:000605750600006Cylindrotheca closterium is one of the diatom species that is dominant particularly in spring and summer in Izmir Bay and Aegean Sea. in this study, growth kinetics of Cylindrotheca closterium have been studied under different temperature, light intensity, nutrient concentrations and salinity conditions. Initially, temperature-light experiments were carried out and optimum temperature is determined to be 18 degrees C for this species. Obtained results at 18 degrees C are mu(max) = 1.97 +/- 0.167 d(-1) for the maximum specific growth rate and K-I = 0.048 +/- 0.028 for the half saturation constant. Then, six light intensities (0.9, 0.88, 0.74, 0.46, 0.2, 0.07 *100 mu mol photon/m(2)s) and seven salinity concentrations (5, 10, 15, 20, 25, 30 and 35 %) were investigated on the growth rate of Cylindrotheca closterium under optimum temperature. The specific growth rate has been calculated to be 2.012 d(-1) at 15 % salinity which is determined to be the optimum concentration. Exponential growth rates are obtained in semi-batch culture by measuring Chl a values and corresponded nutrient concentrations which are statistically valid (p<0,05) in regard to Monod equation (mu = mu(max)*S/K-S+S) and mu(max) values, a parameter of Monod equation, are calculated for different concentrations of ammonium, nitrate, reactive phosphate and reactive silica are 2.48 +/- 0.61 d(-1), 1.92 +/- 0.3 d(-1), 2.1 +/- 0.05 d(-1) and 1.97 +/- 0.20 d(-1), respectively. K-S values, which are another parameter of Monod equation, that are obtained for each nutrient are 17.84 +/- 14.4 mu M NH4+-N, 27.3 +/- 19.04 mu M NO3--N, 0.25 +/- 0.04 mu M PO4-P and 0.3 +/- 0.24 mu M Si, respectively. As a result of global warming, temperature is expected to be risen 6 degrees C in 2100 (Hallegraeff, 2010). The impacts of this increase on the growth rate of Cylindrotheca closterium species in Izmir Bay is calculated, considering this scenario. Nitrogen is determined to be the only restricting compound that inhibits growth during 52 weeks by a study that is conducted by Sunlu vd., (2007). Consequently, the growth rate of the species didn't decline under 1.5 d(-1) during this period of time

Microplankton growth in response to nutrient enrichments in Gerence Bay, Izmir, Western Turkey

859-867<span style="letter-spacing: -.1pt;mso-ansi-language:TR" lang="TR">Present study is to assess the comparative effects of nutrient enrichment within Gerence Bay such a semi-enclosed bay in the Aegean Sea. Water samples were taken in spring seasons (April 2006-2007) and autumn seasons (October 2005-2006) and enriched with nutrients of various concentrations. By applying T test to determine statistical differences between the averages of growth rate. While no difference at the 0.05 level of relevance was observed between the October periods, it was seen that the growth rates of NH4+ NO3- and PO4-3 for the April periods were different (tc=6.62, 9.69, 5.2; df= 19, 18,17 respectively). A season-based study of the growth rates across time, these were higher than 3 (1/day) in October and lower than 2 in the month of April.  Experiments show that the environment may exhibit eutrophic sea conditions in the case of certain nutrients, but characteristics of an oligotrophic environment in the case of others. Consequently, it would be more apt to say that Gerence Bay exhibits intermediate character attributes known to define what is called a mesotrophic environment. </span