Variations in abundance and diversity of phytoplankton in the surface waters of the Golden Horn Estuary (Sea of Marmara)

The abundance pattern and species diversity of phytoplankton in the surface waters of the Golden Horn Estuary were investigated between August 2011 and July 2012 in relation to environmental factors. Seventy-eight phytoplankton taxa (38 diatoms, 30 dinoflagellates and 10 phytoflagellates) belonging to eight taxonomic classes were identified in bottle and net samples. Phytoplankton abundance increased in spring and summer (from March to August) and reached its highest (10,429 × 103 cells L−1) during the bloom of Heterosigma akashiwo (Raphidophyceae) in the middle and upper estuary in late May. In general, phytoplankton abundance was higher in the middle estuary indicating more suitable conditions for phytoplankton growth, while species richness and diversity was higher in the lower estuary. The most abundant species were Skeletonema marinoi and Thalassiosira sp. among diatoms; Scrippsiella trochoidea among dinoflagellates; Plagioselmis prolonga and Heterosigma akashiwo among phytoflagellates. Diatoms were more abundant in the lower and middle estuary, while dinoflagellates and phytoflagellates in the upper estuary. The main factors causing the spatio-temporal variation of phytoplankton in the study area were temperature, salinity, water transparency and nutrients. Water transparency in the upper estuary is mostly influenced by organic and inorganic matter carried by two streams. As a result, this area should be considered a potential risk area for future algal blooms.

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Spring bloom of the raphidophycean Heterosigma akashiwo in the Golden Horn Estuary at the northeast of Sea of Marmara

Ege Journal of Fisheries and Aquatic Sciences ◽

10.12714/egejfas.2016.33.3.03 ◽

2016 ◽

Vol 33 (3) ◽

pp. 201 ◽

Cited By ~ 1

Author(s):

Fuat Dursun ◽

Seyfettin Taş ◽

Tufan Koray

Keyword(s):

Spring Bloom ◽

Heterosigma Akashiwo ◽

Sea Of Marmara ◽

Golden Horn ◽

Golden Horn Estuary

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A statistical evaluation of the potential genotoxic activity in the surface waters of the Golden Horn Estuary

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2010.06.029 ◽

2010 ◽

Vol 60 (10) ◽

pp. 1708-1717 ◽

Cited By ~ 7

Author(s):

Emel Kocak ◽

Kaan Yetilmezsoy ◽

M. Talha Gonullu ◽

Mustafa Petek

Keyword(s):

Surface Waters ◽

Statistical Evaluation ◽

Golden Horn ◽

Genotoxic Activity ◽

Golden Horn Estuary

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

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315420001058 ◽

2020 ◽

Vol 100 (7) ◽

pp. 1053-1062

Author(s):

Seyfettin Tas

Keyword(s):

Species Diversity ◽

Dissolved Oxygen ◽

Environmental Conditions ◽

Secchi Depth ◽

Water Transparency ◽

Phytoplankton Composition ◽

Number Of Species ◽

Relative Contribution ◽

Golden Horn ◽

Golden Horn Estuary

AbstractChanges 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.

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Performance of a Handheld Chlorophyll-a Fluorometer: Potential Use for Rapid Algae Monitoring

Water ◽

10.3390/w13101409 ◽

2021 ◽

Vol 13 (10) ◽

pp. 1409

Author(s):

Hamdhani Hamdhani ◽

Drew E. Eppehimer ◽

David Walker ◽

Michael T. Bogan

Keyword(s):

Chlorophyll A ◽

Surface Waters ◽

Harmful Algal Blooms ◽

Algal Blooms ◽

Water Quality Monitoring ◽

Ambient Light ◽

Calibration Equation ◽

Field Samples ◽

Potential Use

Chlorophyll-a measurements are an important factor in the water quality monitoring of surface waters, especially for determining the trophic status and ecosystem management. However, a collection of field samples for extractive analysis in a laboratory may not fully represent the field conditions. Handheld fluorometers that can measure chlorophyll-a in situ are available, but their performance in waters with a variety of potential light-interfering substances has not yet been tested. We tested a handheld fluorometer for sensitivity to ambient light and turbidity and compared these findings with EPA Method 445.0 using water samples obtained from two urban lakes in Tucson, Arizona, USA. Our results suggested that the probe was not sensitive to ambient light and performed well at low chlorophyll-a concentrations (<25 µg/L) across a range of turbidity levels (50–70 NTU). However, the performance was lower when the chlorophyll-a concentrations were >25 µg/L and turbidity levels were <50 NTU. To account for this discrepancy, we developed a calibration equation to use for this handheld fluorometer when field monitoring for potential harmful algal blooms in water bodies.

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Occurence and Variability of Domoic Acid in Mussel (Mytilus galloprovincialis) Samples from the Golden Horn Estuary, Sea of Marmara (Turkey)

Bulletin of Environmental Contamination and Toxicology ◽

10.1007/s00128-020-03082-7 ◽

2021 ◽

Author(s):

Fuat Dursun

Keyword(s):

Domoic Acid ◽

Mytilus Galloprovincialis ◽

Sea Of Marmara ◽

Golden Horn ◽

Golden Horn Estuary

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Settling particles in the Golden Horn estuary, Sea of Marmara: Concentrations and fluxes of trace elements and radionuclides

Regional Studies in Marine Science ◽

10.1016/j.rsma.2021.101882 ◽

2021 ◽

pp. 101882

Author(s):

Gülşah Kalaycı ◽

Murat Belivermiş ◽

Narin Sezer ◽

Peter Swarzenski ◽

Önder Kılıç

Keyword(s):

Trace Elements ◽

Sea Of Marmara ◽

Settling Particles ◽

Golden Horn ◽

Golden Horn Estuary

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Effects of surface current/wind interaction in an eddy-rich general ocean circulation simulation of the Baltic Sea

10.5194/os-2016-12 ◽

2016 ◽

Author(s):

H. Dietze ◽

U. Löptien

Keyword(s):

Baltic Sea ◽

Ocean Circulation ◽

Surface Waters ◽

Algal Blooms ◽

Circulation Model ◽

Transport Processes ◽

Surface Currents ◽

Wind Effects ◽

The Baltic Sea ◽

The Baltic

Abstract. Deoxygenation in the Baltic Sea endangers fish yields and favours noxious algal blooms. Yet, vertical transport processes ventilating the oxygen-deprived waters at depth and replenishing nutrient-deprived surface waters (thereby fuelling export of organic matter to depth), are not comprehensively understood. Here, we investigate the effects of the interaction between surface currents and winds (also referred to as eddy/wind effects) on upwelling in an eddy-rich general ocean circulation model of the Baltic Sea. Contrary to expectations we find that accounting for current/wind effects does inhibit the overall vertical exchange between oxygenated surface waters and oxygen-deprived water at depth. At major upwelling sites, however, as e.g. off the south coast of Sweden and Finland, the reverse holds: the interaction between topographically steered surface currents with winds blowing over the sea results in a climatological sea surface temperature cooling of 0.5 K. This implies that current/wind effects drive substantial local upwelling of cold and nutrient-replete waters.

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