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.

中文翻译：

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修复后金角湾（马尔马拉海）浮游植物组成的变化

通过从伊斯坦布尔海峡到河口的海水转移，研究了金角湾河口浮游植物组成的变化。与之前的研究相比，本研究期间 Secchi 深度、盐度和溶解氧的平均值有所增加。平均物种数量（S）和物种多样性（H'）增加，它们与Secchi深度、盐度和溶解氧呈正相关。在这项研究和之前的研究之间存在相似的浮游植物群组成，但是物种组成不同。共鉴定了 127 个分类群，包括硅藻（66 个分类群）、甲藻（49 个分类群）和其他（12 个分类群）。然而，在本研究期间，甲藻和植物鞭毛藻的丰度及其对浮游植物总丰度的相对贡献有所增加，与之前的研究相比，硅藻的丰度及其相对贡献显着下降。盐度与甲藻和植物鞭毛藻呈显着正相关（磷< 0.01)，以及在 Secchi 深度和甲藻之间 (磷< 0.01) 在河口上游。此外，盐度和 Secchi 深度与物种多样性呈正相关（H') 和物种数量 (小号) (磷< 0.01)。水透明度的增加可能导致甲藻和植物鞭毛藻的丰度增加。结果表明，水的透明度是影响研究区浮游植物组成的最重要因素之一。海水转移后一些环境条件的变化似乎改变了浮游植物的组成。结果，浮游植物物种被确认为环境条件变化的一个很好的指标。