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Featured researches published by Serhat Albayrak.


Journal of the Marine Biological Association of the United Kingdom | 2011

Role of single-celled organisms in mucilage formation on the shores of Büyükada Island (the Marmara Sea)

Neslihan Balkis; Hakan Atabay; Irfan Türetgen; Serhat Albayrak; Hüsamettin Balkis; Vildan Tüfekçi

This study was implemented to determine the environmental factors and causative organisms of the recent mucilage formation in the Marmara Sea. Samples were taken during the study from 7 different depths (0.5―30 m) of one sampling point of the Buyukada Island shore between January and June 2008. As a result, 6 2 phytoplankton species belonging to 5 different groups were identified. Dinofiagellates were dominant in terms of species number, and diatoms in terms of cell number. In January and February, mucilage formation was very dense, where 5 phytoplankton species (Clindrotheca closterium, Pseudo-nitzschia sp., Skeletonema costatum, Thalassiosira rotula (Bacillariophyceae) and Gonyaulax fragilis (Dinophyceae)) were reported as dominant organisms. Among them, Gonyaulax fragilis has never been reported in the Marmara Sea previously, thus that organism appeared firstly with the formation of dense mucilage and then when the mucilage decayed in May and June 2008, G. fragilis disappeared. Autofluorescent single-celled organisms were classified in three groups depending on their cell sizes (>20 μm, >2 μm, >o.2 μm) by membrane filtration and total count of bacteria were determined by epifluorescence microscope after dying with DAPI. The highest total bacteria was recorded in April at 25 m depth (66 55 ± 44 . 4 cells ml ―1 ) while the lowest count was in June at 0 . 5 m depth ( 1077 ± 2 6. 1 cells ml ―1 ). The seawater temperature ranged between 7.0 and 21.5°C, salinity between 20 . 9 and 37 . 4 ppt and dissolved oxygen amount between 2 . 75 and 12 . 75 mg l ―1 . The chlorophyll-a amount ranged between 0.10 and 6. 35 μg l ―2 , the higher values were recorded in January at 15 m depth (6.35 μg l ―1 ) and in April at 10 m depth ( 4 .8 9 μg l ―1 ). Among the nutrients, the amounts of nitrite + nitrate-N varied between 0 . 02 and 7 .6 7 μg-at N l ―1 , phosphate-P between 0.11 and 0.96 μg-at P l ―1 and silicate-Si between 0.37 and 8. 93 μg-at Si l ―1 . The highest values were determined at a deeper layer where nutrients are accumulated. On the other hand, the N:P ratio interval was found as 0.1―11.3, Si:P ratio as 2.92―52.33 and N:Si ratio as 0.01―1.10 during the sampling period. Nitrogen was the limiting nutrient and the silica amount was enough to enable the development of diatoms.


Marine Pollution Bulletin | 2006

Ecological quality status of coastal benthic ecosystems in the Sea of Marmara

Serhat Albayrak; Hüsamettin Balkis; Argyro Zenetos; Ayşegül Kurun; Cüneyt Kubanç


Mediterranean Marine Science | 2012

Assessment of ecological quality status of Küçükçekmece Bay (Marmara Sea) by applying BENTIX, AMBI, BOPA and BO2A biotic indexes

S. Caglar; Serhat Albayrak


Cahiers De Biologie Marine | 2009

Distribution of polychaete species (Annelida: Polychaeta) on the polluted soft substrate of the Golden Horn Estuary (Sea of Marmara), with special emphasis on alien species.

Melih Frtan Cinar; Hüsamettin Balkis; Serhat Albayrak; Ertan Dagli; Selahattin Ünsal Karhan


Acta Adriatica | 2004

Bivalvia (Mollusca) fauna of the Sea of Marmara

Serhat Albayrak; Hüsamettin Balkis; Neslihan Balkis


Cahiers De Biologie Marine | 2010

Distribution of alien bivalve species in the soft bottom of Iskenderun Bay (Turkey, NE Levantine Sea).

Serhat Albayrak


Belgian Journal of Zoology | 2007

Shallow-water soft bottom macrozoobenthic communities from Edremit Bay (NE Aegean Sea)

Serhat Albayrak; Hüsamettin Balks; Melih Ertan Çinar


Journal of Black Sea / Mediterranean Environment | 2002

Check-List of the Crustacea Fauna of the Bosphorus

Neslihan Balkis; Serhat Albayrak; Hüsamettin Balkis


Aquatic Invasions | 2006

On the presence of Siphonaria belcheri Hanley, 1858 (Gastropoda: Siphonariidae) and Septifer bilocularis (Linnaeus, 1758) (Bivalvia: Mytilidae) in the Iskenderun Bay (SE Turkey)

Serhat Albayrak


Mediterranean Marine Science | 2015

Polychaetes from the northern part of the Sea of Marmara with the description of a new species of Polydora (Annelida: Polychaeta: Spionidae)

Melih Ertan Çinar; Ertan Dağli; S. Çağlar; Serhat Albayrak

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