Additive toxicity of herbicide mixtures and comparative sensitivity of tropical benthic microalgae

Magnusson, Marie, Heimann, Kirsten, Quayle, Pamela and Negri, Andrew P. (2010) Additive toxicity of herbicide mixtures and comparative sensitivity of tropical benthic microalgae. Marine Pollution Bulletin, 60 11: 1978-1987.


Author Magnusson, Marie
Heimann, Kirsten
Quayle, Pamela
Negri, Andrew P.
Title Additive toxicity of herbicide mixtures and comparative sensitivity of tropical benthic microalgae
Journal name Marine Pollution Bulletin   Check publisher's open access policy
ISSN 0025-326X
1879-3363
Publication date 2010-11
Sub-type Article (original research)
DOI 10.1016/j.marpolbul.2010.07.031
Volume 60
Issue 11
Start page 1978
End page 1987
Total pages 10
Place of publication Kidlington, Oxford, United Kingdom
Publisher Elsevier
Collection year 2011
Language eng
Formatted abstract Natural waters often contain complex mixtures of unknown contaminants potentially posing a threat to marine communities through chemical interactions. Here, acute effects of the photosystem II-inhibiting herbicides diuron, tebuthiuron, atrazine, simazine, and hexazinone, herbicide breakdown products (desethyl-atrazine (DEA) and 3,4-dichloroaniline (3,4-DCA)) and binary mixtures, were investigated using three tropical benthic microalgae; Navicula sp. and Cylindrotheca closterium (Ochrophyta) and Nephroselmis pyriformis (Chlorophyta), and one standard test species, Phaeodactylum tricornutum (Ochrophyta), in a high-throughput Maxi-Imaging-PAM bioassay (Maxi-IPAM). The order of toxicity was; diuron > hexazinone > tebuthiuron > atrazine > simazine > DEA > 3,4-DCA for all species. The tropical green alga N. pyriformis was up to 10-fold more sensitive than the diatoms tested here and reported for coral symbionts, and is recommended as a standard tropical test species for future research. All binary mixtures exhibited additive toxicity, and the use of herbicide equivalents (HEq) is therefore recommended in order to incorporate total-maximum-load measures for environmental regulatory purposes. © 2010 .


Keyword Herbicide
Great Barrier Reef
Photosynthesis
Pollution
Fluorometry
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
National Research Centre for Environmental Toxicology Publications
 
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Created: Sun, 19 Dec 2010, 00:07:14 EST