Assessment of the consecutive harmful dinoflagellate blooms during 2015 in the Izmit Bay (the Marmara Sea)

ERG&#220;L Halim Aytekin; AKSAN Serdar; &#304;P&#350;&#304;RO&#286;LU Merve

doi:10.1007/s13131-018-1191-7

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(8): 91-101

ERGÜL Halim Aytekin, AKSAN Serdar, İPŞİROĞLU Merve. Assessment of the consecutive harmful dinoflagellate blooms during 2015 in the Izmit Bay (the Marmara Sea)[J]. Acta Oceanologica Sinica, 2018, 37(8): 91-101. doi: 10.1007/s13131-018-1191-7

Citation:

ERGÜL Halim Aytekin, AKSAN Serdar, İPŞİROĞLU Merve. Assessment of the consecutive harmful dinoflagellate blooms during 2015 in the Izmit Bay (the Marmara Sea)[J]. Acta Oceanologica Sinica, 2018, 37(8): 91-101. doi: 10.1007/s13131-018-1191-7

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Assessment of the consecutive harmful dinoflagellate blooms during 2015 in the Izmit Bay (the Marmara Sea)

doi: 10.1007/s13131-018-1191-7

Department of Biology, Science and Arts Faculty, Kocaeli University, Kocaeli 41380, Turkey

Received Date: 2017-08-08
Rev Recd Date: 2017-12-11

Abstract

Abstract

A series of red tides were observed during 2015 in the Izmit Bay (the Marmara Sea) which is located in the most industrialized and populated region of Turkey. Six samplings were carried out in this area following the red tides. Nitrite-N, nitrate-N, ammonia, silica and orthophosphate concentrations were analyzed spectrophotometrically. Physicochemical conditions were measured by CTD probe. Plankton quantification was performed using counting chambers under microscopes. Prorocentrum micans was the most abundant species, except on May 14, 2015, when Noctiluca scintillans was dominant. The abundance of P. micans reached average 18×10⁶ ind./L on May 3, 2015 in the Karamürsel station, simultaneously with elevated levels of NH₃ and o-PO₄^3-. The sample was also abundant in dead amphipods ((72±12) ind./L) that had been covered by mucilage aggregates produced by P. micans. The highest biomass (calculated by carbon) was recorded as (268±26.0) mg/L on May 14 in the Hereke station. Beside the anthropogenic wastewater discharges, unknown sources and resuspensions caused increases in nutrient levels. After long term northeaster gusts (35 km/h for 5 d) an upwelling occurred on November 6, 2015 after wind-induced sediment resuspension. Although nutrient discharges remarkably decreased over 30 years through established wastewater treatment plants, harmful phytoplankton blooms still occur. Comparing the present results with other studies in nearby Mediterranean seas reveals that the most intense harmful dinoflagellate bloom in recent years occurred in the Izmit Bay. Therefore, additional protection measures necessary for a cleaner Izmit Bay. These incidents also demonstrate that contaminants, accumulated in sediment, may have long-lasting effects on enclosed marine ecosystems.
- red tide,
- harmful algal bloom,
- phytoplankton,
- dinoflagellate,
- Izmit Bay,
- Marmara Sea,
- mucilage

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References(62)

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