Effect of pH irradiance and population size on the toxicity of Furadan to two species of Anabaena.
1996
Rath B. | Adhikary S.P.
In two selected nitrogen-fixing cyanobacterial species Anabaena fertilissima and Anabaena variabilis pH, irradiance and different inocula sizes considerably modified the toxic effect of 50 % effective concentration (EC 50) dose of the pesticide Furadan (carbofuran 75 DB). Maximum growth and chlorophyll (Chl) a content of A. fertilissima was observed in the pH range of 8-9 and that of A. variabilis at pH 7-8, while at acidic pH (5-6) and at pH above 9 these parameters were considerably retarded. Toxicity of the EC 50 dose of Furadan was increased further at pH 5-6, whereas reduction in the toxicity to the test cyanobacteria was observed at pH 7.8-9.0.
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