title: Effect of linear alkylbenzene sulfonate on population growth of Daphnia galeata: a life table evaluation.
abstract: The chronic effect of linear alkylbenzene sulfonate (LAS12) on a daphnid species (Daphnia 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 function. Based on the best-fit power function model with biases corrected by the jackknife procedure, the population-level 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 of 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.
authors.affiliation: Institute of Environmental Science and Technology, Yokohama National University, Tokiwadai 79-7, Hodogaya, Yokohama, Kanagawa 240-8501, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tanaka
authors.forename: J
authors.initials: J
authors.lastname: Nakanishi
mesh_terms: D000367:Age Factors; D017738:Alkanesulfonic Acids / Q000009:adverse effects*; D000818:Animals; D003621:Daphnia; D005260:Female; D007928:Lethal Dose 50; D015993:Life Tables; D008297:Male; D013501:Surface-Active Agents / Q000009:adverse effects*; D014874:Water Pollutants, Chemical / Q000009:adverse effects*
chemical_list: D017738:Alkanesulfonic Acids; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid