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

Marmara Denizi'nin kuzeydoğusunda bulunan Haliç'te Şubat ve Mayıs 2012 arasındaki dönemde, iki haftada bir olmak üzere çevresel faktörlerle birlikte zararlı alg aşırı üremeleri incelendi ve Mayıs sonunda rafidofit Heterosigma akashiwo (Y.Hada) Y.Hada ex Y.Hara & M.Chihara türünün yoğun bir aşırı çoğalması gözlendi. H. akashiwo bolluğu Haliç'in aşağı bölümünden yukarı bölümüne doğru giderek artmıştır. Mayıs sonundaki H. akashiwo'nın yoğun aşırı çoğalması 20.2°C sıcaklık ve 16.4 psu tuzlulukta meydana gelmiş ve bolluğu 10.4×106 hücre L-1'ye ulaşmıştır. Mayıs ortası ile karşılaştırıldığında Mayıs sonunda ortalama yüzey suyu tuzluluk değerleri 2.30 psu, sıcaklık değerleri ise 4.50°C artış göstermiştir. Seki derinliği aşağı bölümden yukarı bölüme doğru hızlı bir şekilde azalmıştır (6.00 m'den 0.50 m'ye). Ani bir sıcaklık artışı, tuzlulukta düşüş ve düşük su sirkülasyonu ile birlikte yüksek besin elementleri konsantrasyonu yukarı Haliç'te H. akashiwo'nın aşırı çoğalmasının nedenleri olarak düşünülmektedir. H. akashiwo aşırı çoğalması boyunca balık ölümü veya ortamda diğer zararlı etkiler gözlenmemiştir. Ancak bu olaylar gelecekte bu çalışma bölgesi için potansiyel toksik bir risk oluşturabilir.

Marmara Denizi'nin kuzeydoğusundaki Haliç'te rafidofit Heterosigma akashiwo'nun ilkbahar aşırı çoğalması

In the period of February-May 2012, harmful algal blooms (HABs) along with environmental factors were investigated biweekly in the Golden Horn Estuary at the northeast of the Sea of Marmara and a dense bloom of the raphidophyceaen Heterosigma akashiwo (Y.Hada) Y.Hada ex Y.Hara & M.Chihara was observed in late May. H. akashiwo abundance increased gradually from the lower estuary to the upper estuary. The dense bloom of H. akashiwo in late May occurred at the temperature of 20.2°C and salinity of 16.4 psu and its abundance reached to 10.4×106 cells L-1. When compared to mid-May, the mean temperature of surface water increased 4.50°C, while salinity decreased 2.30 psu in late May. Secchi depth values decreased rapidly from the lower to the upper estuary (6.00 m to 0.50 m). It is considered that a rapid increase in temperature, a decrease in salinity, and high nutrient concentrations in combination with low water circulation at the upper estuary were the causes of the bloom of H. akashiwo. Fish mortality or other harmful effects in environment were not observed during the H. akashiwo bloom. But, these events may create a potentially toxic risk for the study area in the future.

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