University of Carthage, Faculty of Sciences of Bizerte, LR01ES14 Laboratory of Biomonitoring of the Environment, 7021, Zarzouna, Tunisia.
Department of Biology, College of Sciences, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
Environ Pollut. 2021 Oct 1;286:117300. doi: 10.1016/j.envpol.2021.117300. Epub 2021 May 4.
An experimental study was carried out to determine the effects of the enrichment of sediments by endocrine perturbators on free-living nematodes from the Ghar El Melh lagoon, Tunisia. For 30 days, four concentrations of Estradiol Benzoate (hereafter EB) (0.43, 4.3, 8.6 and 12.9 ng l). The average nematode abundances showed a significant increase after the introduction of EB in their close environment. In contrast, the taxonomic examination has shown a decrease in species diversity of nematodes. The ordination of treatments according to the nMDS showed a clear structural separation of the enriched replicates with EB from controls based on species lists, in particular for concentrations EB3 and EB4. Indeed, under such conditions, the nematofauna exhibited a more remarkable presence of a new record for Science Theristus n. sp. and a decrease in relative abundances of Paracomesoma dubium. On feeding level, a predominance of non-selective deposit-feeders and a decline in proportions of epistrate feeders and carnivorous omnivores was observed with increasing concentrations of EB. Furthermore, in treated replicates with EB, females discernibly showed an increase compared to controls. Overall, EB affect significantly features of meiobenthic nematodes starting from the concentration of 4.3 ng l.
开展了一项实验研究，以确定内分泌干扰物对突尼斯加尔梅尔赫泻湖自由生活线虫的沉积物富集会产生何种影响。在 30 天内，采用了四种浓度的苯甲酸雌二醇（EB）（0.43、4.3、8.6 和 12.9ng/L）。在引入 EB 后，线虫的平均丰度显示出显著增加。相比之下，分类学检查表明线虫的物种多样性有所下降。根据 nMDS 对处理的排序显示，基于物种列表，EB 富化复制品与对照之间存在明显的结构分离，特别是在 EB3 和 EB4 浓度下。事实上，在这种条件下，线虫动物群表现出了一种新记录物种Theristus n. sp.的更显著存在，以及 Paracomesoma dubium 的相对丰度下降。在摄食水平上，随着 EB 浓度的增加，观察到非选择性沉积物摄食者的优势增加，以及表栖食者和肉食性杂食者比例的下降。此外，在有 EB 处理的复制品中，与对照组相比，雌虫明显增加。总体而言，EB 从 4.3ng/L 的浓度开始，对线虫的后生动物特征产生了显著影响。
