The Vertical and Seasonal Distribution of Chlorophyll and Main Nutrients in a Mesotrophic Freshwater Reservoir

Tu?ba Ongun Sevindik; Kemal Çelik
The mesotrophic Ikizcetepeler Reservoir was sampled monthly from February 2007 to June 2008 at three stations. Thermal stratification occurred in the reservoir from May to September. The results revealed high bands of chlorophyll in the epilimnion and metalimnion of the reservoir during summer and winter. Results suggest that high chlorophyll accumulation was a result of the increase in available light levels in spring and deep mixing, providing phytoplankton with the nutrients needed for grow in summer. Correlation analyses were used to determine the relationships between chlorophyll (μg/L), water temperature (oC), total nitrogen (mg/L), total phosphorus (mg/L) and Secchi disk depth (m). Differences in chlorophyll, total phosphorus, total nitrogen and in Secchi disk transparency were not significant among sampling stations (p>0.01), but they were significant among seasons (p<0.01). Successful control of eutrophication requires an understanding of how nutrients, physical conditions and biological processes interact to affect algal growth and since the utility of chlorophyll in estimating algal biomass world-wide, this study was conducted to determine how variations in water temperature, total nitrogen, total phosphorus and water transparency affected the the vertical and seasonal distribution of chlorophyll in Ikizcetepeler Reservoir.
Ikizcetepeler Reservoir; phytoplankton biomass; total nitrogen; total phosphorus; water transparency
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