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Phytoplankton as an Indicator of Improving Water Quality in the Golden Horn Estuary

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Abstract

The variation in phytoplankton community as a response to improving water quality has been studied in the severely polluted Golden Horn Estuary (GHE). Phytoplankton data collected monthly for 4 years and a detailed set of environmental parameters clearly showed the remarkable change in the GHE. The GHE ecosystem did not respond to numerous rehabilitation efforts to improve water quality, unless strict measures were taken to enhance water circulation. The opening of a bridge operating on large buoys and release of high amounts of fresh water from a dam acted as the turning point for the whole system. The weakening of light limitation and anoxia at upper regions is followed by consecutive blooms of different species/groups and resulted in super-saturated dissolved oxygen concentrations and a significant decrease in nutrient concentrations. When compared to the pre-remediation period, average total eukaryotic phytoplankton abundance increased 11-fold in the lower estuary, while the increase in the upper estuary was over 3 × 104 in the post-remediation period. In addition, species richness continuously increased through the study period and community structure showed very strong variability. Since the estuarine ecosystem is controlled by precipitation in the last decade, the increase in anthropogenic/terrestrial inputs following heavy rainfall had adversely affected water quality and phytoplankton.

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Acknowledgments

This manuscript is a part of a detailed monitoring project started mainly by the personal efforts of Prof. Dr. Erdoğan Okuş, who passed away in April 9, 2006 following a tragic accident while he was participating in an oceanographic cruise in the Black Sea. We are grateful to him for his contribution to Turkish marine sciences. We thank to Dr. Nuray Balkis for dissolved oxygen data, Dr. Husne Altiok for CTD data and to Dr. Asli Aslan-Yilmaz for her help in nutrient data. Authors are indebted to the captain, scientists and technicians of R/V ARAR-I for their efforts in the monitoring program. We thank to two anonymous referees for their constructive comments and to Dr. Erin Dreelin for correcting the English of the text. This study was supported by the General Directorate of Istanbul Water and Sewerage Administration within the framework of the Water Quality Monitoring Project.

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  1. Institute of Marine Sciences and Management, Istanbul University, Muskule Sk. 1, Vefa, 34116, Istanbul, Turkey

    Seyfettin Tas, I. Noyan Yilmaz & Erdogan Okus

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  1. Seyfettin Tas
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  2. I. Noyan Yilmaz
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Correspondence to Seyfettin Tas.

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Table 5 Phytoplankton species identified in net and water samples during the study period
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Tas, S., Yilmaz, I.N. & Okus, E. Phytoplankton as an Indicator of Improving Water Quality in the Golden Horn Estuary. Estuaries and Coasts 32, 1205–1224 (2009). https://doi.org/10.1007/s12237-009-9207-3

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