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| 长山列岛附近海域野生鱼类体内微塑料的分布特征研究 |
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张国旗1,2, 孟迪2, 夏斌2,3, 王荣元4, 曲克明2,3, 孙雪梅2,3, 冯志华1
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1.江苏海洋大学 江苏 连云港 222006;2.中国水产科学研究院黄海水产研究所 农业农村部海洋与
渔业可持续发展重点实验室 山东 青岛 266071;3.崂山实验室海洋生态与环境科学功能实验室
山东 青岛 266237;4.国家海洋局北海环境监测中心 山东 青岛 266033
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| 摘要: |
| 随着海洋微塑料污染的日益加剧，长山列岛附近海域生物体内微塑料的分布现状亟待研究。本文研究了长山列岛附近海域7种常见海洋野生鱼类的胃肠道和肌肉中微塑料的污染情况。结果显示，在鱼类肌肉中并未检测到微塑料的存在，微塑料普遍存在于鱼类胃肠道中，其丰度范围为0.19~3.79个/个体；微塑料的尺寸以<300 μm为主，占微塑料总丰度的85.91%；微塑料的形状以纤维为主，其次为碎片和颗粒；微塑料的颜色大多为透明色；在鱼类胃肠道中检测到的聚合物类型为赛璐玢(Cellophane)、纤维素(Cellulose)和聚乙烯(Polyethylene)，其中，以赛璐玢为主要类型。研究结果为探明微塑料对海洋生态环境中鱼类生物效应提供了基础数据和科学依据。 |
| 关键词: 长山列岛 微塑料 野生鱼类 胃肠道 污染特征 |
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| Distribution characteristics of microplastics in wild fish near Changshan Islands |
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ZHANG Guoqi1,2, MENG Di2, XIA Bin2,3, WANG Rongyuan4, QU Keming2,3, SUN Xuemei2,3, FENG Zhihua1
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1.Jiangsu Ocean University, Lianyungang 222006, China;2.Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Marine Fisheries and Sustainable Development, Ministry of Agriculture and Rural Affairs, Qingdao 266071, China;3.Laboratory for Marine Ecology and Environmental Science, Laoshan Laboratory, Qingdao 266237, China;4.North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, China
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| Abstract: |
| Plastic products are widely used in human daily life, while facilitating human life, plastics have also produced many negative effects due to the lack of effective recovery measures, plastic pollution has become an important environmental issue of global concern. Marine plastics can be degraded into smaller microplastics (MPs) through various ways under the influence of environmental factors. They can be ingested by marine organisms mixed with food sources, and then accumulated in the body, causing serious negative effects on marine lifes and marine ecology. Recently, it has been proved that the Changshan Islands sediments contain a certain amount of MPs, the content reached 133.14 to 499.82 n/kg. Changshan Islands is one of the eight major islands in China. It is located at the confluence of the Yellow Sea and the Bohai Sea, and has a unique geographical location. The fish community between the islands is rich in species, especially in many migratory species, and high in species diversity. The seasonal change of fish species composition and dominant species is obvious. It has been proved MPs can cause a certain degree of harm to marine organisms. Therefore, the distribution of MPs in organisms in the Changshan Islands sea area deserves to be studied. In this study, the MPs in the gastrointestinal tracts and muscles of wild fish were digested and separated after collecting them from the marine culture zone of Changshan Islands. The results showed that MPs were detected existing in the gastrointestinal tracts of all fish, but not in muscle tissues. The reason may be that MPs are too large to be endocytosed by intestinal epithelial cells, and thus can not participate in the blood circulation of fish. The abundance of MPs in the gastrointestinal tracts of seven species of marine wild fish ranged from 0.19 to 3.79 items/individual. The abundance of MPs in Coilia nasus is the highest among all fish, this phenomenon may be related to the living environment and predation habits of C. nasus, which living in the bottom of the sea. The MPs in sediments will undergo a cyclic process of suspension, sedimentation and resuspension under the flow of seawater, thus greatly increasing the exposure and intake risk of MPs by bottom organisms, such as C. nasus. The shape of MPs was dominated by the fiber, and the color was mostly transparent, which size is mainly less than 300 μm. The reason may be that the individual size of fish collected in this survey is small, and larger-sized MPs cannot enter into the gastrointestinal tract of fish through feeding. Large plastics in the environment are broken under the photooxidation, wave action, physical wear and alternating freeze-thaw. The different shapes of MPs detected in this study may be derived from the decomposition of these large plastics. Fibers are the predominant form of MPs encountered in global wildlife studies. It could also be because fibrous MPs are the most abundant in the marine environment. Additionally, MPs Fibers can be bended or intertwined with food, possibly due to long-term accumulation for the slower fibers excretion, increasing the chance of being ingested by organisms. The types of polymers detected were cellophane, cellulose and polyethylene, among which cellophane had the highest content. Cellophane is an organic cellulose-based polymer that has been used in food packaging and cigarette packaging. It is also used as a release agent in the manufacture of glass fiber and rubber products, or as a coating in combination with synthetic polymers. There was no obvious toxic effect on cellulose and cellulite. The polymer hazard index (PHI) is an important criterion for risk assessment of MPs, and is based primarily on the percentage content of a given polymer and the polymer’s hazard fraction for ecological and health risk assessment. The potential risk of MPs to humans can be estimated by the polymer hazard index. The higher the polymer hazard index, the higher the ecological risk in the sea area. The toxicity coefficient of polyethylene is 10, the toxicity grade is grade II, the hazard index is low, and it belongs to the low risk polymer. Moreover, people usually discard the gastrointestinal tract of fish before eating, thus the MPs in the fishes of Changshan Islands, and the safety factor of fish products in Changshan Islands is higher. In this study, through the collection of wild fish in Changshan Islands, the MPs in gastrointestinal tract and muscle tissue were extracted, and the abundance and type of MPs were analyzed. The pollution status of MPs in fish in the adjacent waters of Changshan Islands was clarified, which provided basic data for exploring the impact of MPs on the ecological environment safety of Changshan Islands ecosystem. Further research on the distribution of MPs in other wild organisms, such as shellfish, and in other economically viable locations should be considered, which can provide a scientific basis for the analysis of MP pollution levels and the formulation of prevention and control strategies in the marine environment. |
| Key words: Changshan Islands Microplastics Wild fish Gastrointestinal tract Pollution characteristics |
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