"Effect of Linear Alkylbenzene Sulfonate on Population Growth of Daphnia galeta: A Life Table Evaluation" 

Yoshinari Tanaka¹, Junko Nakanishi²

¹Chuo University
²National Institute of Advanced Industrial Science and Technology

Environmental Toxicology, Vol.16 No.4 pp.344-348 (2001)

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Abstract

The chronic effect of linear alkylbenzene sulfonate (LAS12) On a daphnid species (DaphnI'a galeata) was examined by the life table experiment. The estimated responses in the intrinsic rate of population growth r were analyzed with two alternate concentration-response functions, i.e., the power function and the quadratic functl'On. Based on the best-fit power function model with biases corrected by the jackknife procedure, the population-IeveI EC50, Which is defined as the concentration of chemicals that reduces the population growth rate (the intrinsic rate of natural increase) by 50%, was estimated as 2.5 mg/L. The 48-h acute immobility test yielded EC50 0f 4.6 mg/L. The population-level effect of LAS12 on this test species is considerably more sensitive than the acute lethal effects to neonates. @ 200l by John Wiley & Sons. Inc. Environ ToxicoI 16: 344-348, 200l

Keywords

chronic toxicity, Daphnia galeata, life table, population-level effect, population growth rate