埃及废水中水生昆虫对微塑料的摄入和排泄,Environmental Quality Management

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埃及废水中水生昆虫对微塑料的摄入和排泄
Environmental Quality Management Pub Date : 2023-06-16 , DOI: 10.1002/tqem.22029
Azza M. Khedre ₁ , Somaia A. Ramadan ₁ , Ali Ashry ₁ , Mohamed Alaraby ₁

Affiliation

微塑料 (MP) 通常被视为环境和生物污染物。然而，关于生物体，特别是作为水生食物链中食物资源的水生昆虫中 MP 积累的研究还很有限。本研究旨在调查埃及废水池中水和沉积物中水生昆虫中 MP 的积累情况。使用四种典型的淡水昆虫类群。据报道，每克湿重的 MP 负载最高的是收集器-收集者（Chironomus sp. 和Hydrophilus sp.），其次是收集器-过滤者（Culex sp.），MP 负载第二高。然而，掠夺者（Aeshnasp.）的值最低。此外，目前的结果表明，24 小时净化时间后，所有测试的昆虫类群中 MP 的数量均有所减少，但观察到的排泄能力存在差异。24 小时后，摇蚊中每个个体的 MP 平均数量显着减少。和库蚊sp。幼虫中分别喷射出 53% 和 40% 的 MP 颗粒。然而， Aeshna sp.的 MP 排泄能力下降。若虫（25%），嗜水虫的喷射比例最低sp。成人（9%）。聚对苯二甲酸乙二醇酯纤维是沉积物和水中最丰富的 MP 类型，其次是碎片（聚乙烯和聚丙烯）。然而，在各种昆虫物种中仅检测到聚酯纤维。各种昆虫的纤维平均长度略短于周围环境。目前的研究表明，水生昆虫对 MP 的摄入并不总是与环境污染水平相关，因为其他因素（例如摄食策略）可能在 MP 摄入中发挥作用。基于这些观察结果，应进一步开展 MPs 对淡水/水生生物的毒理学影响研究。

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Ingestion and egestion of microplastic by aquatic insects in Egypt wastewater

Microplastics (MPs) are frequently regarded as environmental and biota contaminants. Yet, research on the accumulation of MPs in living entities, particularly aquatic insects that serve as food resources in the aquatic food chain, is limited. This study to investigate the accumulation of MPs in aquatic insects from water and sediment in an Egyptian wastewater basin. Four typical freshwater insect groups were used. The highest MP load per gram wet weight was reported by collector-gatherers (Chironomus sp. and Hydrophilus sp.), followed by collector-filterers (Culex sp.) with the second highest MP load. However, Predators (Aeshna sp.) had the lowest values. Also, the present results showed a reduction in the number of MPs in all insect taxa tested after a 24 h depuration time, with differences in the observed egestion ability. The mean number of MPs per individual significantly reduced after 24 h in both Chironomus sp. and Culex sp. larvae, where 53% and 40% of MPs particles were ejected from them, respectively. However, the ability of MP egestion decreases in Aeshna sp. nymph (25%), and the lowest proportion of ejection was observed in Hydrophilus sp. adults (9%). Polyethylene terephthalate fibers were the most abundant type of MP in both sediment and water, followed by fragments (polyethylene and polypropylene). Yet, only polyester fibers were detected in the various insect species. The average length of fibers in the various insects was somewhat shorter than in the surrounding environment. The current study reveals that MP ingestion by aquatic insects is not always related to levels of pollution in the environment, since other factors such as feeding strategies may play a role in MP ingestion. Based on these observations, further studies should be carried out on studies on toxicological impacts of MPs on freshwater/aquatic biota.

更新日期：2023-06-16

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