G ŞİŞMAN AYDIN, B. BÜYÜKIŞIK, A. KOCATAŞ

Farklı Azot Kaynağının (N03-N ve NH4-N) Zararlı Denizel Diyatomu Thalassiosira allenii Takano (Bacillariophyceae) Büyümesi Üzerine Etkisi

Thalassiosira allenii (Takano) türünün iki azot formundan nasıl etkilendiğini daha iyi anlamak için büyüme hızları üzerinde N03--N ve NH4--N 'nun farklı konsantrasyonun etkileri araştırılmıştır. İzmir Körfezi--Kuzey Ege--Türkiye'den izole edilen T.allenii türü, f/2 zenginleştirme ortamında, sürekli--aydınlık periyotta ve kesikli kültür sisteminde inkübe edildi. Türün büyümesi eksponensiyel büyüme fazı takip edilerek Chl (pgl'l) olarak ölçüldü, elde edilen verilerin istatistiksel analizi en küçük kareler metoduyla yapıldı. Her bir nütrient için hesaplanan Ks ve pmax degerleri sırasıyla: N03 için Ksz0 pg at--NOg--N I'1 ve um": 0.93 giin'l, NH4 için KS: 0.05 pg at--N I'1 ve pmax=l.034 gün'1 olarak bulundu. T.allenii türü her iki azot kaynağında da büyüyebilme yeteneğine sahiptir ve böylece rekabet şansını arttırabilir. Bu sonuçlar T.allenii türünün, aşırı alg çoğalmalarında daha fazla rol alabileceğini göstermektedir.

Effects of different nitrogen (N03-N ve NH4-N) sources on the growth of harmful marine diatom: Thalassiosira allenii Takano (Bacillariophyceae)

In order to better understand the effect of two nitrogen form on T.)allenii, the effects of 6 different concentrations of NO3MN and NH4MN were investigated. T.) allenii) was isolated from İzmir BayMNorthern Aegean SeaMTurkey and incubated in a f/2 enrichment medium under constant light in a batch culture system. The growth rate of the species was measured as Chl a)(mg/l) by monitoring the exponential growth phase. The statistical analysis of the obtained data was performed by utilizing the method of least squares. Half saturation constant (Ks) and maximum spesific growth rate (µmax)values estimated for each nitrogen form were obtained as follows: ~0µmol NO3MN lM1 and 0.93 dayM1 for nitrate, 0.05 µmol NH4MN lM1 and 1.034 dayM1 for ammonium. T.allenii species has ability to use both of the nitrogen and therefore can increase the chances of the competition. This results shows that T.allenii species can be a greater role on Algal Blooms.

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