Shaw Institute, P.O. 1652, 55 Main St, Blue Hill, ME 04614, USA; Bigelow Laboratory for Ocean Sciences, 60 Bigelow Dr., East Boothbay, ME 04544, USA.
Shaw Institute, P.O. 1652, 55 Main St, Blue Hill, ME 04614, USA.
Mar Pollut Bull. 2018 Dec;137:638-645. doi: 10.1016/j.marpolbul.2018.10.061. Epub 2018 Nov 13.
Microplastic fibers (MPF) are a ubiquitous marine contaminant, making up to 90% of global microplastic concentrations. Imaging flow cytometry was used to measure uptake and ingestion rates of MPF by blue mussels (Mytilus edulis). Mussels were fed a diet of Rhodomonas salina and MPF concentrations up to 30 MPF mL, or 0.374% of available seston. Filtration rates were greatly reduced in mussels exposed to MPF. Uptake of MPF followed a Holling's Type II functional response with 95% of the maximum rate (5227 MPF h) occurring at 13 MPF mL. An average of 39 MPF (SE ± 15, n = 4) was found in feces (maximum of 70 MPF). Most MPF (71%) were quickly rejected as pseudofeces, with approximately 9% ingested and <1% excreted in feces. Mussels may act as microplastic sinks in Gulf of Maine coastal waters, where MPF concentrations are near the order of magnitude as the experimental treatments herein.
微塑料纤维（MPF）是一种普遍存在的海洋污染物，占全球微塑料浓度的 90%。使用成像流式细胞术测量贻贝（Mytilus edulis）对 MPF 的摄取和摄入率。贻贝以盐生杜氏藻（Rhodomonas salina）为食，MPF 浓度高达 30 MPF mL，或可用悬浮物的 0.374%。暴露于 MPF 中的贻贝的过滤率大大降低。MPF 的摄取遵循霍林斯第二型功能反应，最大速率（5227 MPF h）的 95%发生在 13 MPF mL 时。粪便中发现平均有 39 个 MPF（SE ± 15，n = 4）（最多 70 个 MPF）。大多数 MPF（71%）迅速被作为假粪便排出，约 9%被摄入，<1%在粪便中排泄。在缅因湾沿海水域，MPF 浓度与本实验处理相近，贻贝可能是微塑料的汇。
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