Sediment Toxicity of Streams Flow through the Inner Part of Izmir Bay with <i>Daphnia magna</i> Straus, 1820
Makaleler > Tam Makale · 2008
Yazarlar: Ozcan Yegane, Hatice Parlak, Özlem ÇAKAL ARSLAN, Meltem Boyacioglu
SU URUNLERI DERGISI, ESCI İndekslerine Giren Dergi, Uluslararası, Wos, 2008, cilt 25, ss 47-51
Özet
The aim of this study is to screen the sediment toxicity of streams that flow into the inner part of Izmir Bay by using the water flea Daphnia magna Straus as a test organism. The toxic contents of collected sediments were elutriated by pure water. The lethal toxicity of elutriates were evaluated by using the 192-h acute toxicity test. Immobilization was used as indices in acute tests. Survival age at first reproduction, number of brood produced and the number of young per adult were used as indices in chronic test. According to acute test results calculated LC50 (192-h) were 79.025% 57.321%, 81.603%, for Melez, Halkapinar, Manda streams respectively. The diluted elutrates were of Bornova Stream were the most toxic among the others as LC50 (1.5 hour) 67.273%. D. magna were exposed to sub-lethal dilutions of sediment elutriates and the results show that all of elutriates produced positive effects (hormeosis). Results of this study showed that, screening the toxicity of polluted waters by using D. magna gives better and more meaningful results to predict the pollution of surface waters.