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Changes in phytoplankton composition of the Golden Horn Estuary (Sea of Marmara) following remediation

Published online by Cambridge University Press:  11 November 2020

Seyfettin Tas Open the ORCID record for Seyfettin Tas [Opens in a new window]
Seyfettin Tas*
Affiliation:
Institute of Marine Sciences and Management, Istanbul University, 34134 Vefa, Fatih, Istanbul, Turkey
*
Author for correspondence: Seyfettin Tas, E-mail: stas@istanbul.edu.tr
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Abstract

Changes in phytoplankton composition of the Golden Horn Estuary were investigated following remediation, through seawater transfer from the Strait of Istanbul to the estuary. Average values of Secchi depth, salinity and dissolved oxygen increased during this study when compared with a previous study. The average number of species (S) and species diversity (H′) increased and they correlated positively with Secchi depth, salinity and dissolved oxygen. There was a similar phytoplankton group composition between this and a previous study, however, the species composition differed. A total of 127 taxa consisting of diatoms (66 taxa), dinoflagellates (49 taxa) and others (12 taxa) were identified. Abundance of dinoflagellates and phytoflagellates and their relative contribution to the total phytoplankton abundance increased during this study, however, the abundance of diatoms and their relative contribution decreased notably, as compared with the previous study. There was a significant positive correlation between salinity and dinoflagellates and phytoflagellates (P < 0.01), and also between Secchi depth and dinoflagellates (P < 0.01) in the upper estuary. Additionally, salinity and Secchi depth correlated positively with species diversity (H′) and number of species (S) (P < 0.01). The increase in water transparency probably contributed to the increase in abundance of dinoflagellates and phytoflagellates. The results revealed that water transparency was one of the most important factors affecting phytoplankton composition in the study area. Changes in some environmental conditions following seawater transfer appear to have changed phytoplankton composition. As a result, phytoplankton species were confirmed as a very good indicator of changed environmental conditions.

Keywords

EstuaryGolden HornphytoplanktonSea of Marmarawater transparency
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 7 , November 2020 , pp. 1053 - 1062
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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