Pigments as biomarkers of exposure to the vineyard herbicide flazasulfuron in freshwater algae.

Abstract:

:Weed control in Champagne vineyards has long relied on the use of diuron and substituted triazines; these compounds are now being replaced by flazasulfuron, a sulfonylurea that is used at a much lower dosage. The vineyards of Champagne are planted on steep slopes and runoff is important, and even though low doses of these herbicides are used, they may present some potential risk for freshwater ecosystems. Therefore, the effects of the sulfonylurea herbicide, flazasulfuron (formulated as Katana) was investigated on the unicellular green alga Scenedesmus obliquus. The pigment content of the algal suspensions was followed as a biomarker of exposure to the herbicide. The results demonstrate that flazasulfuron induced a reduction in chlorophyll content at concentrations of 10 microg/L, while the increase of pigment content in the culture was reduced with the lowest concentration tested (0.1 microg/L). Among the three pigments tested, chlorophyll a appeared to be the most sensitive biomarker. In the algal medium, flazasulfuron was slowly degraded (DT(50) approximately 8 days) in a compound that was tentatively identified. The toxicity of this herbicide for the algae was comparable to that of older herbicides which are used at a much higher rate. Therefore, we may speculate that even if flazasulfuron comes into contact with freshwater ecosystems, its effects on algae will be less deleterious than that of traditional herbicides.

journal_name

Ecotoxicol Environ Saf

authors

Couderchet M,Vernet G

doi

10.1016/s0147-6513(02)00064-7

keywords:

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

271-7

issue

3

eissn

0147-6513

issn

1090-2414

pii

S0147651302000647

journal_volume

55

pub_type

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