Over a one year program of intensive monitoring of effluents from Ontario Hydro’s nuclear, fossil and hydroelectric generating facilities, the Daphnia magna and rainbow trout, Oncorhynchus mykiss, acute toxicity tests correlated well, with 61% of the toxic effluents toxic to both species. K the effluent was toxic to only one of the test species it was generally toxic to D. magna, with from 23 to 51% of the toxic effluents toxic to D. magna only. The greater sensitivity of D. magna to boiler blowdown effluent likely resulted from a combination of the low conductivity erf boiler blowdown effluent and the smaller size and greater surface to volume ratio of D. magna relative to rainbow trout D. magna were also particularly susceptible to oil/water separator samples, with the daphnids frequently observed to be caught at the surface/water interface. These observations suggest that an accumulation of organic material at the air/water interface was responsible for the mortality of D. magna. In subsequent tests, we also examined the relationship between the D. magna acute toxicity test and a bacterial-based assay (Toxi-Chromotest*) for several toxic effluents from Ontario Hydro stations to determine if bacterial-based tests could provide similar information in less time with smaller sample volumes. Hie D. magna acute toxicity test did not correlate well with the bacterial-based Toxi-chromotest*. In particular, many of the samples which were toxic to D. magna were not toxic to the Toxi-chromotest* assay.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Comparison of Daphnia magna, rainbow trout and bacterial-based toxicity tests of Ontario Hydro aquatic effluents
D. W. Rodgers
L. Vereecken Sheehan
- Springer Netherlands