F.Sanem İZGÖREN, Baha BÜYÜKIŞIK

Işık ve sıcaklık değişimlerinin Chaetoceros gracilis Schütt ( Bacillariophyceae ) üzerine etkileri

Bu çalışmanın amacı yetistiricilikte yoğun olarak kullanılan ve İzmir Dış Körfez'den izole edilen Chaetoceros gracilis Schutt türünün büyümesi üzerine ışık ve itibaren ışık şiddeti azaldıkça tedrici olarak azalma göstermiştir. 28°C sıcaklıkta da, 32°C'da olduğu gibi 1500 ftCd ışık şiddeti fotoinhibisyona sebep olmakladır. 800 ftCd ışık şiddetinden daha düşük ışık şiddetlerinde büyüme hızında değişimler çok daha fazla olmaktadır. 22°C'de ve 17°C'de ise, daha yüksek sıcaklıklara göre spesifik büyüm hızları biraz düşmesine rağmen, büyüme devam etmiştir. Bu sıcaklık için de aynı şekilde en yüksek büyüme hızı 1300 ftCd ışık şiddetinde elde edilmiştir. Işık şiddeti-sıcaklık denemeleri, C. gracilis türünün "euryterm" oduğunu göstermektedir. Buna rağmen türün büyümesi üzerine ışığın sıcaklıktan daha etken olduğunu söylemek güçtür.

Anahtar Kelimeler:

organik madde, sucul kültür, çevresel faktörler, sıcaklık, büyüme, fitoplankton, büyüme performansı, ışık ilişkisi, ışık

The effects of light and temperature variations on cahaetoceros gracilis Schütt (Bacillariohyceae)

The effects of light and temperature variations on Chaetoceros gracilis Schutt (Bacillariophyceae). This research will attempt to find the effects of light and temperature on the growth of Chaetoceros gracilis Schutt, widely used in aquaculture. The species was issolated outer part of İzmir Bay. It was found out that under batch culture conditions, the optimum temperature and light intensities were found as 28CC and 1300 ftCd, respectively. In various experiments optimum specific growth of the species have been measured, under temperature conditions ranging from 28-32cC. The decrease in temperature led to a decrease in the growth rates and this decrease slowed down gradually whenever the light intensity was decreased from 1300 ftCd. At 28°C, as a 32°C 1500 ftCd light intensity leads to photoinhibition. At light intensities lower than 800 ftCd, the change in the growth rates get biger. At 22°C and 17°C, though the specific growth rates have decreased compared with higher temperatures, growth has continued. For this temperatures, too, maximum growth rate was recorded at 1300 ftCd. The light intensity-temperature experiments have shown that the C. gracilis is "eurytherm". Although, it is difficult to say that light has a more effective on the growth of the species than temperature.

Keywords:

organic matter, aquaculture, environmental factors, temperature, growth, phytoplankton, growth performance, light relations, light,

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