Atrazine aquatic animals

Lethal and sublethal effects of atrazine on selected species of aquatic animals... 

Table 11.5 Lethal and Sublethal Effects of Atrazine on Selected Species of Aquatic Animals (Concentrations listed are in micrograms of atrazine per liter of medium.)...

Aquatic animals were less sensitive to the triazines than were aquatic plants. Toxicity to fish and arthropods varied, with fish or crustaceans sharing the position of most sensitive aquatic animal, depending on the herbicide. In the case of atrazine, arthropods were generally more sensitive than fish. Ratios of the 10th centiles between animals and plants were varied. The animal/plant ratio for atrazine (arthropods) was 24, while hexazinone was 202800. The hexazinone data were from a small data set, and the atrazine data were for arthropods and could not be compared to data for the other triazines. However, the ratios for the other triazines also varied over an order of magnitude, from 176 for prometon to 1688 for prometryn. Since the molecular weights of the triazines are similar, one would expect their... 

Atrazine, with acute oral LD50 values of >900 mg kg , is practically nontoxic to birds. The compound is slightly toxic to aquatic animals. Rainbow trout and midge, the most sensitive freshwater species tested, have 96 and 48 h LC50 values of... 

FIGURE 4.5 Risk curves based on exposure distribution for annual maximum atrazine concentrations in Tennessee ponds and chronic species sensitivity distributions for aquatic plants and animals. 

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