Toxic effects and bioaccumulation of the herbicide isoproturon in Tubifex tubifex (Oligocheate, Tubificidae): A study of significance of autotomy and its utility as a biomarker

Tubifex is the only animal reported to respond with autotomy to contamination. This response of contaminated worm is understood as a mode of metal excretion. Few data concern the potential of organic compounds to induce tubifex autotomy. The objective of this study was to investigate if autotomy can...

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Bibliographic Details
Published in:Aquatic toxicology 2010-06, Vol.98 (1), p.8-14
Main Authors: Paris-Palacios, Séverine, Mosleh, Yahia Y., Almohamad, Mohamad, Delahaut, Laurence, Conrad, Arnaud, Arnoult, Fabrice, Biagianti-Risbourg, Sylvie
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Animals
Applied ecology
aquatic invertebrates
Autotomie
bioaccumulation
Biological and medical sciences
Biomarker
biomarkers
Biomarkers - analysis
Ecotoxicology, biological effects of pollution
Fundamental and applied biological sciences. Psychology
General aspects
Herbicides - pharmacokinetics
Herbicides - toxicity
Isoproturon
Lethal Dose 50
Metabolites
mortality
Oligochaeta - drug effects
Oligochaeta - physiology
Oligochaete
Phenylurea Compounds - pharmacokinetics
Phenylurea Compounds - toxicity
Regeneration
Residue
Techniques
toxicity
Tubifex
Tubifex tubifex
Tubificidae
water pollution
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Summary:Tubifex is the only animal reported to respond with autotomy to contamination. This response of contaminated worm is understood as a mode of metal excretion. Few data concern the potential of organic compounds to induce tubifex autotomy. The objective of this study was to investigate if autotomy can be induced by a herbicide isoproturon (IP) and be related to the way of excretion. Isoproturon accumulation in worm tissues and its effect on tubifex mortality, autotomy and regeneration rates were analysed after 4 and 7 days of exposure to the herbicide and also when worms were replaced for 10 days in clean water. IP accumulated in the same way in all parts of the worm body but IP metabolite rates were significantly higher in the posterior part of the worm. Thus the loss of the posterior part allows the worm to eliminate an important amount of pesticide. Autotomy has a population importance and is related to the degree of worm contamination so it may become an interesting biomarker.
ISSN:0166-445X
1879-1514
DOI:10.1016/j.aquatox.2010.01.006