hoa (version 2.1.4.1)

daphnia: `Daphnia Magna' Data

Description

The daphnia data frame has 136 rows and 2 columns.

Ecotoxicity study to assess the impact of the herbicide dinoseb on the survival of Daphnia magna Strauss, 1820, a micro-crustacean widely used as test organism in aquatic ecotoxicological assays. The design of the experiment includes 35 irregularly spaced concentrations ranging from 0.006 to 11.3 mg/l and a control group. The upper endpoint of 11.3 mg/l is the highest concentration at which the test substance is soluble in the test medium. The number of replicates per concentration varies from 1 to 11 experimental units. The survival time is measured in days.

Usage

data(daphnia)

Format

This data frame contains the following columns:

conc

the tested concentration (mg/l);

time

the survival time in days.

References

Brazzale, A.R. (2000) Practical Small-Sample Parametric Inference. Ph.D. Thesis N. 2230, Department of Mathematics, Swiss Federal Institute of Technology Lausanne. Section 5.3, Example 5.

Ch\`evre, N., Becker-van Slooten, K., Tarradellas, J., Brazzale, A. R., Behra, R. and Guettinger, H. (2001) Effects of dinoseb on the entire life-cycle of Daphnia magna. Part II: Modelling of survival and proposal of an alternative to No-Observed-Effect-Concentration (NOEC). Environmental Toxicology and Chemistry, 21, 828--833.

Examples

# NOT RUN {
data(daphnia)
attach(daphnia)
plot(conc, time, xlab = "test concentration (mg/l)", 
     ylab = "survival time (d)", log = "y")
detach()
# }