Iron Budget and Its Correlations with Macronutrients in the Inshore Waters of the Aegean Sea |
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Authors: | Kemal C Bizsel Murat V Ardelan Nihayet Bizsel |
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Institution: | (1) Institute of Marine Science and Technology, Dokuz Eylul University, Baku Bulvari No:32 Inciralti, 35340 Izmir, Turkey;(2) Department of Chemistry, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway |
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Abstract: | Macronutrients and micronutrients were measured during the phytoplankton bloom period and then seasonally monitored after
the bloom in the polluted Izmir Bay. Iron and the macronutrients (phosphate, ammonium, nitrate, nitrite, and silicate) were
abundant in the waters of the inner and middle sections of Izmir Bay. The iron concentration decreased exponentially from
the eutrophic inner bay to the oligotrophic outer bay. Suboxic–anoxic processes and the resuspension dynamics in the sediment
were the most important factor in the control of iron, ammonium, and phosphate enrichment in the bay beside the anthropogenic
activities. The biological removal of Fe in the inner and middle bay and nonbiological removal in the outer bay were effective
in controlling iron concentration in Izmir Bay. The nitrate, nitrite, and ammonium nitrogen (N) and Si decreased to critical
levels in the middle and outer bay at the end of the summer as long as the concentration of phosphate was high. The N/P ratios
in the bay suggested that N might be the controlling nutrient for phytoplankton growth particularly in the middle and outer
bay throughout summer. Furthermore, Si was also able to have controlling impact probably on diatom growth during autumn and
winter in the inner and middle bay and in the early spring in the outer bay. The N/Si/Chelex labile Fe ratios implied that
the iron could be a critical controlling nutrient for phytoplankton growth during early April in the outer bay unless the
other macronutrients were low. |
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