Size-dependent elimination of ingested microplastics in the Mediterranean mussel Mytilus galloprovincialis
Size-dependent elimination of ingested microplastics in the Mediterranean mussel Mytilus galloprovincialis
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DOI：
10.1016/j.marpolbul.2019.110512
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发表时间：
2019-12-01
影响因子：
5.8
通讯作者：
Inoue, Koji
中科院分区：
文献类型：
--
作者：
Kinjo, Azusa;Mizukawa, Kaoruko;Inoue, Koji
据报道，滤食性生物在海洋环境中摄入微塑料（MP）。然而，关于摄入的MPs在消化道中保留多长时间的信息仍然有限。在这里，我们报告了三种不同大小的聚苯乙烯微球（1、10和90 μ m）在地中海贻贝（Mytilus galloprovincialis）中的肠道滞留时间（GRT(90)）和长期消化时间。我们发现GRT（90）在MP大小方面存在显著差异。对于MPs的长期排泄，大多数较小的MPs立即被排出，尽管有些直到第40天才被检测到。相比之下，较大的MPs被缓慢地大量排出，之后就没有检测到它们了。结果表明，不同大小的MPs在贻贝消化道中的保留量不同。因此，在评价MPs对贻贝的影响时，应考虑到MPs的大小依赖效应。
Filter feeding organisms have been reported to ingest microplastics (MP) in marine environments. However, information regarding how long the ingested MPs are retained in their digestive tracts remains limited. Here, we report the gut retention time (GRT(90)) and the long-term egestion time of three different sized polystyrene microspheres (1, 10, and 90 mu m) in the Mediterranean mussel Mytilus galloprovincialis. We found significant differences in GRT(90) with respect to MP size. With respect to the long-term egestion of MPs, most of the smaller MPs were excreted immediately, although some were detected intermittently until day 40. In comparison, larger MPs were slowly excreted in bulk, after which they were not detected. The results indicate that different sized MPs are retained differently in the digestive tract of mussels. The size-dependent effects of MPs should thus be considered when evaluating the effects of MPs in mussels.