Acute Toxicity of Cadmium on Ophelia bicornis Savigny, 1822

Ophelia bicornis türünde kadmiyumun akut toksisitesini değerlendirmek için statik biyolojik deneyler yapılmıştır. Organizmalar 24, 48, 72 ve 96 saat süreyle farklı konsantrasyonlara maruz bırakılmıştır. % 95 güven aralığına sahip LC50 değerleri 24, 48, 72 ve 96 saatleri için probit yöntemlerle istatistiksel olarak tahmin edilmiş olup, sırasıyla Grup 1 (15 ve 25 mm boy) için 26 (22,8-29,4), 18 (15-22), 12 (9,1-14,4) ve 7,2 ( 6,8-7,5) ve Grup 2 (26 ve 36 mm boy) için 28 (24,6-33,8), 24 (22,4-25,5), 18 (16,1-19) ve 8,7 (7,8-9,6) mg/l olarak hesaplanmıştır. Kadmiyum toksisitesi hem konsantrasyon hem de maruz kalma süresine bağlı olarak değişmiştir. LC50 değerleri organizmaların uzunluğu arttıkça arttı. O. bicornis ölüm yüzdesi, yüksek toksik konsantrasyonlara ve maruz kalma süresine bağlı olarak artmıştır. Sonuçlar O. bicornis türünün kadmiyuma duyarlı olduğunu göstermiştir.

Anahtar Kelimeler:

Ophelia bicornis, Öldürücü konsantrasyon, toksisite, kadmiyum, Karadeniz

Acute Toxicity of Cadmium on Ophelia bicornis Savigny, 1822

Static bioassays to assess acute toxicity of cadmium to Ophelia bicornis were conducted. Organisms were exposed to the different concentrations for 24, 48, 72 and 96-hr. The LC50 values for 24, 48, 72 and 96-h with 95% confidence limits were estimated statistically by the probit methods and were 26 (22.8-29.4), 18 (15-22), 12 (9.1-14.4) and 7.2 (6.8-7.5) mg/l for Group 1 (15 and 25 mm in length) and 28 (24.6-33.8), 24 (22.4-25.5), 18 (16.1-19) and 8.7 (7.8-9.6) mg/l for Group 2 (26 and 36 mm in length), respectively. Toxicity of Cd was dependent on both concentration and exposure time. LC50 increased with increasing the length of organisms. Mortality of O. bicornis was increased corresponding to the high toxic concentrations and duration of exposure. Results showed that O. bicornis was sensitive to cadmium.

Keywords:

Lethal concentration, toxicity, cadmium, Ophelia bicornis, Black Sea,

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