Abstract
At present, at least three and up to five plant species are required to assess the potential risks of herbicides to non-target aquatic plants. Several regulatory authorities are considering whether there should be further requirements based on concerns about the possible selectivity of herbicides (e.g., specific modes of action against dicotyledonous plants). The relative sensitivity of a range of aquatic plants is assessed in our work in order to evaluate the implications of differences in species sensitivity for aquatic risk assessment of herbicides. We therefore present results from ecotoxicological tests performed at Syngenta Crop Protection AG on various aquatic plants and compare them to available studies and results in literature. The criterion used for sensitivity ranking is the EC50 (median effect concentration) value, which allows a better comparison of values from different testing methods and conditions. The overall results obtained in the present work show that the aquatic risk assessment procedure for herbicides based on Lemna sp. and algae is sufficiently protective while identifying potential toxicity to non-target plants. Only few exceptions concerning herbicides with selective modes of action (e.g., auxin simulators) may require additional species testing for proper risk assessment.
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References
American Society for Testing and Materials (ASTM), 1995. Standard Guide for Conducting Static 96-h Toxicity Tests with Microalgae. E 1218-90, In Annual Book of ASTM Standards, Vol. 11.05, Philadelphia, PA, 573–584
Brock, T. C. M., J. Lahr & P. J. Van den Brink, 2000. Ecological Risks of Pesticides in Freshwater Ecosystems. Part 1: Herbicides. Wageningen, Alterra, Green World Research. Alterra-Rapport 088
B. P. Elendt (1990) ArticleTitleSelenium deficiency in crustacea; an ultrastructural approach to antennal damage in Daphnia magna Straus Protoplasma 154 25–33 Occurrence Handle1:CAS:528:DyaK38XhtVCqsr8%3D Occurrence Handle10.1007/BF01349532
J. F. Fairchild D. S. Ruessler A. R. Carlson (1998) ArticleTitleComparative sensitivity of five species of macrophytes and six species of algae to atrazine, metribuzin, alachlor and metolachlor Environmental Toxicology and Chemistry 17 1830–1834 Occurrence Handle1:CAS:528:DyaK1cXlslGrtLY%3D Occurrence Handle10.1897/1551-5028(1998)017<1830:CSOFSO>2.3.CO;2
FIFRA SAP (Federal Insecticide, Fungicide and Rodenticide Act Scientific Advisory Panel), 2001. Review of non-target plant toxicity tests under the North American Free Trade Agreement (NAFTA). SAP Report No. 2001-08, June 27–29, Arlington, VA
FIFRA, 1989a. Guideline No. 122-2: Growth and Reproduction of Aquatic Plants – Tier I
FIFRA, 1989b. Guideline No. 123-2: Growth and Reproduction of Aquatic Plants – Tier II
W. R. Green H. E. Westerdahl (1990) ArticleTitleResponse of Eurasian watermilfoil to 2,4-d concentrations and exposure times Journal of Aquatic Plant Management 28 27–32
M. D. Netherland K. D. Getsinger (1992) ArticleTitleEfficacy of triclopyr on Eurasian watermilfoil: concentrations and exposure time effects Journal of Aquatic Plant Management 30 1–5
OECD (Organisation for Economic Cooperation and Development), 1984. Guideline-No. 201 for Testing of Chemicals: Alga, Growth Inhibition Test. Official Journal of the European Communities, 92/69/EEC: C.3
OECD, 2001. Revised Draft Document: Lemna sp. Growth Inhibition Test
S. A. Selim S. W. O’Neal M. A. Ross C. A. Lembi (1989) ArticleTitleBioassay of photosynthetic inhibitors in water and aqueous soil extracts with Eurasian watermilfoil (Myriophyllum spicatum) Weed Science 37 810–814 Occurrence Handle1:CAS:528:DyaK3cXhtFCjt7w%3D
US EPA, 2001. Proposal to Update Non-Target Plant Toxicity Testing under NAFTA
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Vervliet-Scheebaum, M., Knauer, K., Maund, S.J. et al. Evaluating the necessity of additional aquatic plant testing by comparing the sensitivities of different species. Hydrobiologia 570, 231–236 (2006). https://doi.org/10.1007/s10750-006-0185-1
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DOI: https://doi.org/10.1007/s10750-006-0185-1