The low toxicity indicated by A. fischeri in the porewater in
some of the samples(onlyIC20 valuescouldbedetermined)and
the lack of toxicity in the other samples confirms the low toxicity
using the same test method in a previous study on the toxicity of
the untreated and treated leachate at the inlet and outflow of the
wetland (Waaraetal.,2008). In many studies evaluating the
toxicity of landfill leachate A. fischeri has been shown to be a less
sensitive test organism than several other species(Clément etal.,
1996; DevareandBahadir,1994; Isidori etal.,2003; Waaraetal.,
2008). This can be explained,at least partly,by its low sensitivity
to un-ionized ammonia and,as a marine species,it has a natural
tolerance to high salinity.The reason to include it in the test
battery was,apart from its tolerance to un-ionized ammonia and
salts, because it is rapid and both liquid samples and whole
sediments can be assessed