Issue 11, 2010

The potential of individual based population models to extrapolate effects measured at standardized test conditions to relevant environmental conditions—an example for 3,4-dichloroaniline on Daphnia magna

Abstract

In current risk assessment ecotoxicological biotests (e.g.Daphnia reproduction test) are used to assess the potential impact of xenobiotics on ecosystems. The effects of chemicals and pesticides on populations of non-target organisms in the field depend not only on the exposure and the toxicity, but also on other factors such as life history characteristics. The effects of 3,4-dichloroaniline (3,4-DCA) measured with standardized test procedures, namely the Daphnia immobilisation test (OECD 202) and Daphnia reproduction test (OECD 211), were extrapolated to the population level using an individual-based Daphnia magna population model (IDamP) integrating only the effects on mortality and reproduction. The application of IDamP to extrapolate the effects on population levels was tested on two different population datasets, differing in the start population as well as in the feeding regime. The simulation results were compared to data derived from population experiments under semi-static and flow-through conditions. The IDamP model with an integrated toxicity module was able to predict the effects of 3,4-DCA on the population level under constant laboratory conditions for both datasets. This modelling approach was used to establish concentration–response relationships for 3,4-DCA on the population level. For this purpose two endpoints, the population capacity and the extinction probability, were calculated for different food levels. It turned out that the concentration–response relationship of the population capacity was less influenced by food supply, whereas for daphnid populations exposed to 3,4-DCA the extinction risk was twice as high with lower (environmental relevant) food supply. For both endpoints the lowest EC50 was calculated to be 25 and 35 µg l−1. The calculation of concentration–effect relationships on the population level by using a modelling approach provides a tool to extrapolate from effects derived from lab experiments to effects on the population level and can improve the ecological risk assessment of chemicals and pesticides.

Graphical abstract: The potential of individual based population models to extrapolate effects measured at standardized test conditions to relevant environmental conditions—an example for 3,4-dichloroaniline on Daphnia magna

Article information

Article type
Paper
Submitted
07 Apr 2010
Accepted
20 Jul 2010
First published
10 Sep 2010

J. Environ. Monit., 2010,12, 2070-2079

The potential of individual based population models to extrapolate effects measured at standardized test conditions to relevant environmental conditions—an example for 3,4-dichloroaniline on Daphnia magna

T. G. Preuss, M. Hammers-Wirtz and H. T. Ratte, J. Environ. Monit., 2010, 12, 2070 DOI: 10.1039/C0EM00096E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements