Influence of salinity on atrazine toxicity to a Chesapeake Bay copepod (Eurytemora affinis) and fish (Cyprinodon variegatus) |
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| Authors: | Lenwood W Hall Michael C Ziegenfuss Ronald D Anderson Terry D Spittler Harry C Leichtweis |
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| Institution: | 1. University of Maryland System Maryland Agricultural Experiment, Station, Wye Research and Education Center, Box 169, 21658, Queenstown, Maryland
2. Department of Food Science and Technology, Cornell Analytical Laboratories, 14456, Geneva, New York
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| Abstract: | The objective of this study was to determine the influence of a range of salinities (5%., 15%., and 25%.) on the acute toxicity of atrazine to nauplii of the copepodEurytemora affinis and larvae of the sheepshead minnow,Cyprinodon variegatus. Ninety-six-hour LC50 values for the copepod were 0.5 mg 1?1, 2.6 mg 1?1, and 13.2 mg 1?1 at salimities of 5%., 15%. and 25%. respectively. A comparison of LC50 values between adjacent salinities showed a statistical difference between 15%. and 25%. but not between 5%. and 15%.. Atrazine was more toxic toE. affinis at the lowest salinity. The 96-h LC50s for the sheepshead minnow were 16.2 mg 1?1, 2.3 mg 1?1, and 2.0 mg 1?1 at salinities of 5%., 15%., and 25%., respectively. There was a statistical difference between LC50 values at 5%. and 15%. but not between 15%. and 25%.. In contrast toE. affinis results, atrazine was more toxic toC. variegatus at the highest salinity. The toxicity data from these species suggest that development of estuarine water quality criteria is warranted. |
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