The toxicity of the fungicide propiconazole to soil flagellates

We investigated the effects of the ergosterol-inhibiting fungicide, propiconazole {1-[[2-(2,4-dichlorphenyl)-4-propyl-1,3-dioxolan-2- yl]methyl]-1H-1,2,4 triazole; Tilt}, on mixed natural populations of bacterivorous and fungivorous flagellates in soil and on single species of bacterivorous flagella...

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Bibliographic Details
Published in:Biology and fertility of soils 2000, Vol.31 (1), p.70-77
Main Authors: EKELUND, F, WESTERGAARD, K, SEE, D
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Dimastigella trypaniformis
Ecotoxicology, biological effects of pollution
Effects of pollution and side effects of pesticides on protozoa and invertebrates
ergosterol
Fundamental and applied biological sciences. Psychology
propiconazole
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Summary:We investigated the effects of the ergosterol-inhibiting fungicide, propiconazole {1-[[2-(2,4-dichlorphenyl)-4-propyl-1,3-dioxolan-2- yl]methyl]-1H-1,2,4 triazole; Tilt}, on mixed natural populations of bacterivorous and fungivorous flagellates in soil and on single species of bacterivorous flagellates in liquid culture. The fungicide affected a mixed natural population of fungivorous flagellates less than the population of bacterivorous flagellates. Our results indicated that the effects of propiconazole on flagellates are direct toxic effects and not effects mediated via their food. All tested types of flagellates were significantly harmed when exposed to the concentration of propiconazole normally applied to agricultural fields (625 mg l super(-1)). However, when exposed to the concentration of propiconazole which we expect in the soil water phase after application (ca. 0.6 mg l super(-1)) the effect on most of the tested flagellates was slight. Still, one tested flagellate species, Dimastigella trypaniformis, was extremely sensitive to the compound, and it is possible that field application of propiconazole has negative effects on certain sensitive species, and therefore alters the composition of the soil flagellate community in the direction of a higher r/K ratio.
ISSN:0178-2762
1432-0789
DOI:10.1007/s003740050626