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Journal of Soils and Sediments

, Volume 11, Issue 8, pp 1419–1431 | Cite as

A non-invasive observation parameter to complement sediment bioassays using Myriophyllum aquaticum

  • René Schreiber
  • Anette Küster
  • Ute Feiler
  • Matthias Grote
  • Rolf AltenburgerEmail author
SEDIMENTS, SEC 1 • SEDIMENT QUALITY AND IMPACT ASSESSMENT • RESEARCH ARTICLE

Abstract

Purpose

The objective of this study was to modify a sediment contact protocol to a multiwell plate exposure system which supplements measurement of the fresh weight change (FWC) using the non-invasive effective quantum yield of energy conversion at photosystem II (PS II) reaction centres (Y(II)) in parallel. Since Y(II) is a functional parameter and FWC represents a whole-plant structural response, the determination of a more pronounced response in one of these parameters may hint at the mode of action of contaminants. By the observation of Y(II) at different time points, extrapolation of effect development over time may be gained from modelling.

Material and methods

An established sediment contact protocol was adapted to an exposure in multiwell plates. During exposure, the Y(II) of exposed Myriophyllum aquaticum was measured using an imaging-pulse amplitude-modulated chlorophyll fluorometer. At the end of the 13-day exposure, the FWC was determined and the IC50 for FWC and Y(II) was estimated using concentration–response modelling. A concentration–time–response model was used to describe the effect development on Y(II) over time. This protocol was applied to natural sediments and to artificial sediments which were spiked with different contaminants.

Results and discussion

It was shown that for the PS II inhibitor atrazine, the IC50 was four times lower on the Y(II) compared to the value for the FWC. In contrast, for the acetolactate-synthase inhibitor metsulfuron methyl, no effect on the Y(II) of exposed M. aquaticum could be found, while a 100% inhibition in FWC was detected. For dinitro-o-cresol, a decoupler of oxidative phosphorylation, the IC50 for the FWC and the Y(II) were of the same order of magnitude. These results are in agreement with the current mode of action understanding and show the potential of this method to interpret differences in determined IC values as mode of action dependent. Moreover, a clear decrease in estimated I Y(II),tx C 50 values by the end of the 13-day exposure was found for atrazine. This strengthens the hypothesis that effects of contaminants in sediment are not immediately evident but may evolve over time.

Conclusions

With the miniaturised sediment contact assay, mode of action dependent differences in IC values on the FWC and the Y(II) could be determined. Based on results from the concentration–time–response modelling, it could be assumed that during the 13-day exposure all contaminants may not fully exert their effects. Since investigated natural sediments did not show inhibitions on Y(II), while pronounced effects on the FWC were found, the FWC may also be worthwhile to be studied over time.

Keywords

Aquatic toxicology Exposure prediction Phytotoxicity PKPD models Risk assessment 

Notes

Acknowledgements

We would like to thank S. Aulhorn, J. Reibetanz and J. Riedl for excellent technical assistance; W. Brack for providing us with the sediment from Spittelwasser and E. Schymanski for reading the manuscript. For constructive criticism we would like to thank two anonymous reviewers. U.F. thanks the German Federal Ministry of Education and Research (BMBF, Germany; FKZ 02WU0598). M.G. thanks the Agence National de Recherche (ANR, France; ANR-07-ECOT-0794C0111). This work was partly financed by the Federal Institute of Hydrology (BfG, Koblenz, Germany) and the Électricité de France (EDF R&D, Chatou Cedex, France).

Supplementary material

11368_2011_410_MOESM1_ESM.pdf (398 kb)
ESM 1 (PDF 398 KB)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • René Schreiber
    • 1
    • 2
  • Anette Küster
    • 3
  • Ute Feiler
    • 4
  • Matthias Grote
    • 5
  • Rolf Altenburger
    • 1
    Email author
  1. 1.Department Bioanalytical EcotoxicologyUFZ-Helmholtz Centre for Environmental ResearchLeipzigGermany
  2. 2.Institute for Environmental SciencesUniversity Koblenz-LandauLandauGermany
  3. 3.German Federal Environment Agency (UBA)Dessau-RoßlauGermany
  4. 4.German Federal Institute of Hydrology (BfG)KoblenzGermany
  5. 5.EDF R&DNational Hydraulics and Environment LaboratoryChatou CedexFrance

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