0000000000940394
AUTHOR
Christoph Schäfers
Consequences of 3,4-dichloroaniline to guppy populations (Poecilia reticulata): computer simulation and experimental validation
Abstract In order to evaluate the effects of 3,4-dichloroaniline (3,4-DCA), which were detected in a life-cycle test with guppies, on the population level, laboratory guppy populations were examined with regard to regulative parameters. Among the endpoints investigated in life-cycle tests, fecundity was shown to be a sensitive parameter. In laboratory guppy populations, however, intraspecific predation on newborn was the main regulator. Based on these data, a computer simulation programme was used to predict the consequences of 3,4-DCA to guppy populations. A population exposure experiment was conducted to validate the simulation results. The effects detected in the life-cycle test (LOEC: 2…
Effects of 3,4-dichloroaniline on fish populations. Comparison between r- and K-strategists: A complete life cycle test with the guppy (Poecilia reticulata)
In order to compare data derived from life cycle tests with zebrafish (Brachydanio rerio Ham.- Buch.), an r-strategist, with data of fish exhibiting a differing strategy of reproduction, a complete life cycle test with the guppy (Poecilia reticulata Peters) was performed with the chemical 3,4-dichloroaniline. The generation of guppies exposed during the whole life span (FI) reacted with more sensitivity than the generation exposed only as adults (Fo): Growth of adult females and reproduction was reduced significantly at 200 Μg/L in Fo, and even at 2 and 20 Μg/L in FI. The survival rates of the early life stages were not influenced at the tested concentrations. There is hardly any difference…
Toxicity of 3,4-dichloroaniline to perch (Perca fluviatilis) in acute and early life stage exposures
Abstract The toxitity of 3,4-dichloroaniline to perch was investigated in order to compare the sensitivity of crucial life stages with common test fish like zebrafish. Although in the acute toxicity test perch were more sensitive by a factor of five, larval sensitivity was in the same range in both species as well as in other egg-laying species. In spite of different water temperature and size, the zebrafish is a good model to predict early life stage toxicity of 3,4-DCA to the compared European freshwater species. Perch larvae are not suited for early life stage tests, as they are sensible towards experimental conditions and perform early cannibalism.