Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, University of Carthage, Faculty of Sciences of Bizerte, 7021, Zarzouna, Tunisia.
Institut National des Sciences et Technologies de la Mer, 28 rue de 2 mars 1934, 2025, Salammbô, Tunisia.
Environ Sci Pollut Res Int. 2016 Apr;23(8):7712-21. doi: 10.1007/s11356-015-5936-y. Epub 2016 Jan 9.
The biocide Irgarol 1051 has been reported to have negative effects on a large number of living components including non-target organisms, but information on its impact on the marine meiofauna and benthic prokaryotes is completely lacking. Here, we report the results of long-term experimental studies in which we determined the effects of increasing Irgarol concentrations (from 11.5 to 315 ng g(-1) sediment dry weight) on meiofauna and benthic prokaryotes. We found that this biocide had a significant impact on meiofauna abundance, even at the lowest concentrations, causing a drastic decline in the abundance of nematodes (the dominant meiofaunal taxon) and an increase of the relative importance of oligochaetes. Even if no direct effects of Irgarol were found on prokaryotic abundance and biomass, the molecular fingerprinting analyses (automated ribosomal intergenic spacer analysis) showed that the prokaryotic diversity was significantly altered by the biocide. The results of the present study indicate that Irgarol 1051 in marine sediments has a significant impact on the smallest eukaryotic and microbial components also at very low concentrations (ca 12 ng g(-1)).
杀生物剂 Irgarol 1051 已被报道对包括非目标生物在内的大量生物组成部分具有负面影响，但关于其对海洋小型生物区系和底栖原核生物的影响的信息完全缺失。在这里，我们报告了长期实验研究的结果，在这些研究中，我们确定了 Irgarol 浓度（从 11.5 到 315 ng g(-1) 沉积物干重）升高对小型生物区系和底栖原核生物的影响。我们发现，这种杀生物剂对小型生物区系丰度有显著影响，即使在最低浓度下，也会导致线虫（占主导地位的小型生物区系分类群）丰度急剧下降，寡毛类相对重要性增加。即使没有发现 Irgarol 对原核生物丰度和生物量的直接影响，分子指纹图谱分析（自动核糖体基因间 spacer 分析）也表明，原核生物多样性因杀生物剂而发生了显著改变。本研究的结果表明，Irgarol 1051 在海洋沉积物中即使在非常低的浓度（约 12 ng g(-1)) 下，也会对最小的真核生物和微生物组成部分产生重大影响。
