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- W83886385 abstract "Ozet: Izmir Ic Korfezi'ne dokulen derelerin Daphnia magna Straus, 1820 ile sediment toksisitesi. Bu calismanin amaci Izmir Korfezi'ne dokulen derelerin sediment toksisitesini su piresi Daphnia magna kullanarak izleyebilmektir. Toplanan sedimentlerin toksik icerigi saf su ile elusyondan sonra belirlenmistir. Elusyonlarin letal toksisitesi 192-s akut toksisite testi ile belirlenmistir. Akut testlerde hareketsizlik indis olarak kullanilmistir. Kronik testlerde hayatta kalma, ilk ureme gunu, anac basina yumurta ve yavru sayilari indis olarak kullanilmistir. Akut test sonuclarina gore LC 50 (192-s) degerleri yaklasik olarak Melez, Halkapinar, Manda dereleri icin %79.025, %57.321, %81.603 olarak hesaplanmistir. Bornova deresi diger istasyonlarla karsilastirildiginda, belirlenen LC 50 (1.5 saat) %67.273 degeri ile daha toksik bulunmustur. Sub-letal sediment elusyonu seyrelmelerine maruz birakilan D. magna testi sonuclari ise tum elusyonlarin pozitif etki yarattigini gostermistir (hormeosis). Bu calismada elde edilen veriler D. magna kullanilarak yuzey sularinin kirliliginin daha iyi ve anlamli bir sekilde belirlenebilecegini gostermektedir. Anahtar Kelimeler: Sediment Toksisitesi, Daphnia manga, Akut toksisite, Kronik Toksisite. Abstract: 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 LC 50 (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 LC 50 (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." @default.
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- W83886385 date "2008-03-01" @default.
- W83886385 modified "2023-09-28" @default.
- W83886385 title "Sediment Toxicity of Streams Flow through the Inner Part of İzmir Bay with Daphnia magna Straus, 1820." @default.
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