Summary
Field samples of freshwater algae were examined to determine the effect of the insecticide Zectran on photosynthesis rate. Concentrations of Zectran between 10 and 103 parts per billion (ppb) affected neither O2 production nor NaH14CO3 uptake in any of the seven genera tested. However, Zectran at a concentration of 104 ppb after 1 hour effected a reduction in photosynthesis ofChroococcus,Oedogonium and in a mixed sample composed ofZygnema,Mougeotia andSpirogyra. Mougeotia,Spirogyra andSchizogonium were not affected by exposure to 104 ppb Zectran after 1 hour, but O2 production was significantly reduced after 24 hours of exposure to this same concentration.
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This work was supported by an Environmental Protection Agency grant -68-01-2672.
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Sheridan, R.P., Simms, M.A. Effect of the insecticide Zectran (Mexacarbate) on several algae. Bull. Environ. Contam. Toxicol. 13, 565–569 (1975). https://doi.org/10.1007/BF01685180
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DOI: https://doi.org/10.1007/BF01685180