Statistical models to predict the toxicity of major ions to Ceriodaphnia dubia, Daphnia magna and Pimephales promelas (fathead minnows)*. Distinguishing Characteristics. Rostrum absent; Head small and depressed; Cervical sinus present; Postabdominal claw with central pecten: two pecten. The LC50 for survival in Daphnia pulex (adults) and Ceriodaphnia dubia (juveniles) was in the same range, whereas the susceptibility of both species to the.


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In most instances, a toxicity test with a reference toxicant ceriodaphnia dubia performed to assess the sensitivity of the organisms at the time the test material or substance is evaluated, and the precision of results for that chemical obtained by the laboratory.


Reference toxicity test is a test conducted using a reference toxicant in conjunction with a definitive toxicity test using a particular test material or substance, to appraise the sensitivity of the organisms and the precision and reliability of results obtained by the laboratory for that reference chemical at the time the test ceriodaphnia dubia or substance is evaluated.

Deviations outside anestablished normal range indicate that the sensitivity of the test organisms, and the performance and precision of the test, are suspect. Stock solution is a concentrated aqueous solution of the substance or material to be tested. Measured volumes of a stock solution are added to dilution water in order to prepare the required strengths of test solutions.

Substance is a particular kind of material having more or less uniform properties. Ceriodaphnia dubia word substance has a narrower scope than material, and might refer to a particular chemical e.

Upstream water is surface water e. Wastewater is a general term which includes effluents, leachates, and elutriates.

Daphnids: Ceriodaphnia dubia, Daphnia magna

Statistical and Toxicological Terms Acute means within a short period of exposure seconds, minutes, hours, or a few days in relation to the life span of the test organism.

Acute lethality, acutely lethal mean causing the death of the test organisms within a short period of exposure to a test substance or material, usually 48 h for daphnids. For tests with cladocerans, chronic is typically defined as continuing ceriodaphnia dubia three broods are produced.

Chronic toxicity implies long-term effects that are related to changes in such things as: Endpoint means the measurement s or value s that characterize the results of a test e.

It also means the response of the test organisms that is measured e. Geometric mean is the mean of repeated measurements, calculated on a logarithmic basis. It has the advantage that extreme values do not have as great an influence on the mean as is the case for an arithmetic ceriodaphnia dubia.

Homoscedasticity refers herein to data showing homogeneity of the residuals within a scatter plot. This term applies when the variability of the residuals does not change significantly with that of the independent variable i.

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When ceriodaphnia dubia statistical analyses and assessing residuals e. Hormesis ceriodaphnia dubia an effect in which low concentrations of the test material or substance act as a stimulant for performance of the test organisms compared to that for the control organisms i.


At higher concentrations, deleterious effects are seen. ICp is the inhibiting concentration for a specified percent effect.

Ceriodaphnia dubia - Wikipedia

It represents a point estimate of the concentration of test substance or material that causes a designated percent impairment ina quantitative biological function such ceriodaphnia dubia reproductive success.

This term should be ceriodaphnia dubia for any toxicological test which measures a change in rate, such as reproduction, growth, or respiration. The term EC50 or median effective concentration is limited to quantal measurements, i.

LC50 is the median lethal concentration, i. The duration of exposure must be specified e.

Lethal means causing death by direct action.