6533b851fe1ef96bd12a8eb6
RESEARCH PRODUCT
Assessment of the toxicity of a pesticide with a two-generation reproduction test using Daphnia magna.
Encarna SanchoEnrique J. AndreuM. SánchezM. D. Ferrandosubject
InsecticidesDiazinonOffspringmedia_common.quotation_subjectImmunologyPopulationDaphnia magnaBiologyToxicologychemistry.chemical_compoundAnimal scienceToxicity TestsAnimalseducationreproductive and urinary physiologymedia_commonPharmacologyeducation.field_of_studyReproductionPesticidebiology.organism_classificationBroodCulture MediachemistryDaphniaDiazinonToxicityReproductiondescription
Abstract Daphnia magna (F 0 generation) were exposed during 21 days to different diazinon concentrations. Offspring (animals from the first and third brood: F 1 (1st) and F 1 (3rd), respectively) were transferred to a free pesticide medium during a 21-day recovery period. The algae Nannochloris oculata (5×10 5 cells/ml) were used as food. In this recovery study, survival, growth and reproduction (mean total young per female, mean brood size, onset of reproduction and mean number broods per female) were assessed as individual parameters, and the intrinsic rate of natural increase ( r ) as population parameter for F 1 (1st and 3rd broods) daphnids. Reproduction as well as survival was still reduced in F 1 (1st) generation daphnids from parentals (F 0 ) exposed to the highest diazinon concentration. However, F 1 (1st) and F 1 (3rd) individuals from parentals exposed to pesticide concentrations below 0.5 ng/l were able to restore reproduction and survival when a recovery period of 21 days was allowed.
year | journal | country | edition | language |
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2000-02-08 | Comparative biochemistry and physiology. Part C, Pharmacology, toxicologyendocrinology |