Uptake of microplastics by marine worms depends on feeding mode and particle shape but not exposure time.
Uptake of microplastics by marine worms depends on feeding mode and particle shape but not exposure time.
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海洋蠕虫对微塑料的吸收取决于摄食方式和颗粒形状，但与暴露时间无关。
DOI：
10.1016/j.scitotenv.2022.159287
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Porter A
中科院分区：
文献类型：
--
作者：
Porter A
海洋物种对微塑料的吸收已被广泛记录在营养水平上。摄食方式在决定物种间不同污染负荷方面起着重要作用，但这一理论缺乏经验证据的支持。在这里，我们使用底栖多毛类杂色海迪斯的两种不同的摄食模式(O.F.Müler，1776)来检验滤食将导致微塑料颗粒比沉积物摄取更大这一假设。将蠕虫暴露在聚酰胺微碎片和微纤维中1 周，无论是水(作为过滤饲料)还是沉积物(作为沉积物饲料)。暴露时间在1 天至1 周之间没有发现影响(p>； 0.001)，但喂养方式显著影响从每条虫中回收的微纤维的数量(p<； 0.19)。当接触到超细纤维时，滤食性蠕虫比沉积捕食性蠕虫多摄取15,000 %的纤维(p<； 0.001)，而当摄食微片段时，两种摄食模式没有区别。研究结果表明，投料方式和颗粒特性对杂色假单胞菌对微塑料的吸收有显著影响。使用成像流式细胞术，发现滤食者吸收的颗粒范围更广，与沉积物喂食者相比，滤食者的颗粒明显更小和更大(p<； 0.05)，这与从环境中回收的沙鼠肠道中分离出的塑料的范围相称。这些结果表明，生物特性有助于理解海洋蠕虫对塑料的吸收，并值得进一步探索，以此作为了解塑料对海洋生物的生物可获得性的工具。
The uptake of microplastics into marine species has been widely documented across trophic levels. Feeding mode is suggested as playing an important role in determining different contamination loads across species, but this theory is poorly supported with empirical evidence. Here we use the two distinct feeding modes of the benthic polychaete,Hediste diversicolor(The Harbour Ragworm) (O.F. Müller, 1776), to test the hypothesis that filter feeding will lead to a greater uptake of microplastic particles than deposit feeding. Worms were exposed to both polyamide microfragments and microfibres in either water (as filter feeders) or sediment (as deposit feeders) for 1 week. No effect of exposure time was found between 1 day and 1 week (p> 0.19) but feeding mode was found to significantly affect the number of microfibres recovered from each worm (p< 0.001). When exposed to microfibers, filter feeding worms took up ≈15,000 % more fibres than deposit feeding worms (p< 0.001), whereas when feeding on microfragments there was no difference between feeding modes. Our data demonstrate that both feeding mode and particle characteristics significantly influence the uptake of microplastics byH.diversicolor. Using imaging flow cytometry, filter feeders were found to take up a broader size range of particles, with significantly more smaller and larger particles than deposit feeders (p< 0.05), commensurate with the range of plastics isolated from the guts of ragworms recovered from the environment. These results demonstrate that biological traits are useful in understanding the uptake of plastics into marine worms and warrant further exploration as a tool for understanding the bioaccessibility of plastics to marine organisms.