Department of Biology, College of Sciences, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
Research Centre for Biochemical, Environmental and Chemical Engineering, Sustainability Solutions Research Lab, University of Pannonia, Egyetem str. 10, 8200, Veszprém, Hungary.
Environ Sci Pollut Res Int. 2022 Mar;29(11):16529-16548. doi: 10.1007/s11356-021-16885-w. Epub 2021 Oct 14.
A microcosm experiment was carried out to determine how benzo(a)pyrene (BaP) may affect marine meiofauna community, with a main emphasis on nematode structure and functional traits. Three increasing concentrations of BaP (i.e. 100, 200 and 300 ng/l, respectively) were used for 30 days. The results revealed a gradual decrease in the abundance of all meiobenthic groups (i.e. nematodes, copepods, amphipods, polychaetes and oligochaetes), except for isopods. Starting at concentrations of 200 and 300 ng/l BaP, respectively, significant changes were observed at community level. At taxonomic level, the nematode communities were dominated at the start of the experiment and also after being exposed or not to BaP by Odontophora villoti, explicable through its high ecologic ubiquity and the presence of well-developed chemosensory organs (i.e. amphids), which potentially increased the avoidance reaction following exposure to this hydrocarbon. Moreover, changes in the activity of several biochemical biomarkers (i.e. catalase 'CAT', gluthatione S-transferase 'GST', and ethoxyresorufin-O-deethylase 'EROD') were observed in the nematode species Oncholaimus campylocercoides, paralleled by significant decreases in CAT activity for non-gravid females compared to controls at concentrations of 25 ng/l BaP and associated with significant increase in GST and EROD activities for both types of individuals.
开展了一项微宇宙实验，以确定苯并(a)芘 (BaP) 可能如何影响海洋小型后生动物群落，主要侧重于线虫结构和功能特征。使用了三种递增浓度的 BaP（即分别为 100、200 和 300ng/l），为期 30 天。结果表明，除等足类外，所有小型底栖动物群（即线虫、桡足类、端足类、多毛类和寡毛类）的丰度逐渐减少。从 BaP 浓度分别为 200 和 300ng/l 开始，在群落水平上观察到显著变化。在分类学水平上，线虫群落从实验开始就占主导地位，并且在暴露于或不暴露于 BaP 的情况下也是如此，这可以通过其高度的生态普遍性和存在发育良好的化学感觉器官（即触角）来解释，这可能会增加对线虫暴露于这种碳氢化合物的回避反应。此外，在线虫物种 Oncholaimus campylocercoides 中观察到几种生化生物标志物（即过氧化氢酶'CAT'、谷胱甘肽 S-转移酶'GST'和 7-乙氧基异吩恶唑-O-脱乙基酶'EROD'）的活性发生变化，与对照相比，在 BaP 浓度为 25ng/l 时，未怀孕雌性的 CAT 活性显著降低，同时 GST 和 EROD 活性在两种类型的个体中均显著增加。
