URVVC-SE EA 2069, Laboratoire d'Ecotoxicologie, Faculté des Sciences, Université de Reims Champagne-Ardenne, BP 1039, 51687 Reims cedex 2, France.
Aquat Toxicol. 2010 Jun 1;98(1):8-14. doi: 10.1016/j.aquatox.2010.01.006. Epub 2010 Jan 18.
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.
颤蚓是唯一被报道会因受到污染而发生自切的动物。这种受污染的蠕虫的反应被理解为一种金属排泄方式。关于有机化合物是否能诱导颤蚓自切的相关数据较少。本研究的目的是探讨除草剂异丙隆（IP）是否能诱导自切，并探讨其与排泄方式的关系。研究分析了在暴露于除草剂后 4 天和 7 天，以及在更换到干净水后 10 天，IP 在虫体组织中的积累及其对颤蚓死亡率、自切率和再生率的影响。IP 在虫体的所有部位都以相同的方式积累，但 IP 代谢物的比率在后半段虫体中明显更高。因此，后半段的损失使蠕虫能够清除大量的农药。自切对种群有重要意义，并且与蠕虫的污染程度有关，因此它可能成为一个有趣的生物标志物。
