Survival time analysis of least killifish (Heterandria formosa) and mosquitofish (Gambusia affinis) in acute exposures to endosulfan sulfate

Archives of Environmental Contamination and Toxicology
John F CarrigerGary M Rand

Abstract

Single-species flow-through toxicity tests were conducted to determine the times-to-death of two indigenous fish to South Florida--least killifish (Heterandria formosa) and mosquitofish (Gambusia affinis)--from acute exposure to endosulfan sulfate. Mortalities were recorded within 8-h periods from test initiation to termination at 96 h. The 96-h LC(50)s for least killifish and mosquitofish estimated using the trimmed-Spearman-Karber method were 2.0 and 2.3 microg/l, respectively. An accelerated failure time model was used to estimate times to death at selected concentrations. Data were fit to log-normal, log-logistic, and Weibull distributions. Acute toxicity data fit to the Weibull distribution produced a better relative fit than log-normal or log-logistic distributions for both toxicity tests. The survival-time profiles and associated statistics illustrate the benefit of considering exposure duration as well as concentration when predicting acute risk to species' populations. Both toxicity tests had similar outcomes from exposure to endosulfan sulfate, with least killifish being slightly more likely to die at lower concentrations and shorter time periods than mosquitofish. From the models generated by the toxicity tests, time...Continue Reading

References

Jan 1, 1997·Annual Review of Public Health·E T Lee, O T Go
May 1, 1997·Archives of Environmental Contamination and Toxicology·C J Miles, R J Pfeuffer
Sep 30, 2005·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·H M ShivaramaiahI R Kennedy
May 4, 2011·Integrated Environmental Assessment and Management·Thorsten Schad, Ralf Schulz

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Citations

Jan 12, 2011·Archives of Environmental Contamination and Toxicology·Carla BacchettaGabriela Fiorenza Biancucci
Dec 4, 2010·Archives of Environmental Contamination and Toxicology·John F CarrigerJoffre Castro

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