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Abstract：
Microplastic (MP) ingestion has been recorded in 39 zooplankton species from 28 taxonomic orders, and marine zooplankton are the organisms most susceptible to MPs. However, few field studies have examined the characteristics and major influencing factors of MPs in marine zooplankton. The present study investigated the shape, color, size, chemical composition and quantity of MPs in zooplankton in the rainy and dry seasons in the Bohai Sea. Furthermore, the relationship between the MPs in zooplankton and the MPs in seawater was studied. The results showed that the MPs in zooplankton of the Bohai Sea were dominated by blue fibers. In the rainy and dry seasons, fibers accounted for 92% and 93%, respectively, of all ingested MPs, while 50% and 55%, respectively, of ingested MPs were blue. The average size of MPs in zooplankton was 1300 ± 1520 μm in the rainy season and 1040 ± 1060 μm in the dry season. Regarding the MP chemical composition, in the rainy and dry seasons, the ingested MPs were dominated by cellophane, which accounted for 53% and 68%, respectively, of MPs, followed by polyester (PET), which accounted for 18% and 20%, respectively, of MPs. The composition of MPs in zooplankton was mainly affected by the composition of MPs in seawater. No significant difference in the MP composition was observed between the two seasons or among the different zooplankton groups. The MP number was significantly higher in individual medusa than in individuals of other zooplankton groups. The mean quantity of MPs in the Bohai Sea zooplankton community in the rainy season was 2.03 ± 2.87 piece/m3, which was significantly higher than that in the dry season, 0.41 ± 0.38 piece/m3. The above results will provide a reference for marine ecological risk assessments based on the characteristics of MPs in natural seas.
摘要：
微塑料（MP）摄入已记录在28个分类学目的39个浮游动物物种中，海洋浮游动物是最容易受到MP影响的生物。然而,很少有实地研究研究海洋浮游动物中MPs的特征和主要影响因素。本研究调查了形状，颜色,尺寸,渤海雨季和旱季浮游动物中MPs的化学成分和数量。此外，研究了浮游动物中的MPs与海水中的MPs之间的关系。结果表明，渤海浮游动物中的MPs以蓝色纤维为主。在雨季和旱季，纤维占92%和93%，分别,在所有摄入的议员中，而50%和55%，分别,摄入的国会议员是蓝色的。浮游动物中MPs的平均大小在雨季为1300±1520μm，在旱季为1040±1060μm。关于MP的化学成分，在雨季和旱季，摄入的议员以玻璃纸为主，分别占53%和68%，分别,议员们,其次是聚酯（PET），分别占18%和20%，分别,的议员。浮游动物中MPs的组成主要受海水中MPs组成的影响。在两个季节之间或不同浮游动物组之间，MP组成没有显着差异。美杜莎个体的MP数量明显高于其他浮游动物组的个体。雨季渤海浮游动物群落中MPs的平均数量为2.03±2.87件/m3，明显高于旱季，0.41±0.38个/m3。以上结果将为基于自然海域MPs特征的海洋生态风险评估提供参考。
