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Red tide observations along the Eastern Black Sea coast of Turkey

To determine the occurrence of dominant phytoplanktonic species causing red tides along the eastern Black Sea (Trabzon) coast of Turkey, multiple samples were collected periodically between 1991 and 2001. Red tide events were observed only during the periods between February and July. Six phytoplanktonic species causing 5 red tide events detected were Diplopsalis lenticula, Euglena acusformis, Eutreptia lanowii, Pyramimonas orientalis, Scrippsiella trochoidea, and Gymnodinium sanguineum. | Turk J Bot 30 (2006) 375-379 © TÜB‹TAK Research Article Red Tide Observations along the Eastern Black Sea Coast of Turkey Ali Muzaffer FEYZ‹O⁄LU, Hamdi Ö⁄ÜT Karadeniz Technical University, Faculty of Marine Sciences 61530 Çamburnu, Trabzon - TURKEY Received: 22.07.2005 Accepted: 07.03.2006 Abstract: To determine the occurrence of dominant phytoplanktonic species causing red tides along the eastern Black Sea (Trabzon) coast of Turkey, multiple samples were collected periodically between 1991 and 2001. Red tide events were observed only during the periods between February and July. Six phytoplanktonic species causing 5 red tide events detected were Diplopsalis lenticula, Euglena acusformis, Eutreptia lanowii, Pyramimonas orientalis, Scrippsiella trochoidea, and Gymnodinium sanguineum. Numeric density of species during the red tide events ranged between 0.97 x 106 and 356 x 106 cells l-1. During the red tides, the highest level of chlorophyll-a biomass ranged between 4.6 and 54.87 µg l-1. Effects of such ecological parameters as temperature, salinity, nitrite, nitrate, phosphate, and total Fe on the level of red tide, measured as the number of cells per litre, are also discussed. Key Words: red tide, phytoplankton, algal bloom, Black Sea Do¤u Karadeniz K›y›lar› Boyunca Red Tide Gözlemleri Özet: Türkiye’nin Do¤u Karadeniz sahillerinde red tide’a sebep olan bask›n fitoplanktonik türlerin belirlenmesi amac›yla 1991 ve 2001 tarihleri aras›nda periodik olarak fitoplankton örneklemeleri yap›lm›flt›r. Red tide olaylar› sadece fiubat ile Temmuz aylar› aras›nda gözlenmifltir. Befl red tide’a sebep olan 6 fitoplankton türü tespit edilmifltir: Diplopsalis lenticula, Euglena acusformis, Eutreptia lanowii, Pyramimonas orientalis, Scrippsiella trochoidea ve Gymnodinium sanguineum. Türlerin red tide s›ras›ndaki say›sal yo¤unluklar› 0.97 x 106 ve 3.56 x 106 hücre l-1 aras›nda oldu¤u tespit edilmifltir. Red tide s›ras›nda klorofil a de¤erlerini 4.6 ve 54.87 µg l-1 aras›nda de¤iflti¤i .