Low concentrations and low spatial variability of marine microplastics in oysters (Crassostrea virginica) in a rural Georgia estuary
Low concentrations and low spatial variability of marine microplastics in oysters (Crassostrea virginica) in a rural Georgia estuary
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DOI：
10.1016/j.marpolbul.2019.110672
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发表时间：
2020-01-01
影响因子：
5.8
通讯作者：
Byers, James E.
中科院分区：
文献类型：
--
作者：
Keisling, Clarissa;Harris, R. Daniel;Byers, James E.
微塑料是海洋生态系统健康的一个新问题。在美国东南部，滤食性东部牡蛎（Crassostrea virginica）很容易摄入微塑料。我们对河流输入有限的乡村河口（佐治亚州圣凯瑟琳湾）的 28 个珊瑚礁中的成年牡蛎（可收获尺寸 > 7.5 厘米）中微塑料的分布进行了量化。为了确定哪些变量最能预测牡蛎中的微塑料浓度，我们还量化了牡蛎的补充、距海洋的距离、取水量和水体宽度。每只牡蛎平均含有 0.72 个微塑料颗粒（每克湿质量 0.18 个颗粒）；微碎片和微塑料同样丰富。尽管微塑料浓度较低，但多变量模型发现水体宽度对塑料微纤维的现场浓度有积极影响；平均微片段长度受到提取的影响。我们的工作加深了人们对沿海河口微塑料分布的了解，提供了与已检查的城市化河口的重要农村对比。
Microplastics are an emerging concern for the health of marine ecosystems. In the southeastern US, the filter-feeding Eastern oyster, Crassostrea virginica, is susceptible to microplastic ingestion. We quantified the distribution of microplastics within adult oysters (harvestable size > 7.5 cm) from 28 reefs throughout a rural estuary with limited riverine inputs (St. Catherines Sound, Georgia). To determine which variables best predict microplastic concentration in oysters, we also quantified oyster recruitment, distance to ocean, fetch, and water body width. Oysters averaged 0.72 microplastic particles per individual (0.18 particles per gram wet mass); microfragments and microplastics were equally abundant. Although microplastic concentrations were low, multivariate models identified a positive effect of water body width on the site-level concentration of plastic microfibers; average microfragment length was affected by fetch. Our work informs a growing understanding of microplastic distribution in coastal estuaries, providing an important rural contrast to the urbanized estuaries that have been examined.