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Microplastics (MPs) pollution has become a hot research topic in the environmental field, while few studies have reported the MPs pollution in the gastrointestinal tract of river fish in Hainan Island. In the present study, 222 freshwater fish specimens belonging to 35 species with different feeding habits were collected from 11 sampling sites located in the upper, middle, and lower reaches of the Nandu River. The pollution characteristics of MPs in the gastrointestinal tract of fish samples were analyzed. The results showed that MPs were detected in 94.5% of the fish gastrointestinal tracts, with an average abundance of (4.85±3.51)MPs per fish. The MPs in fish gastrointestinal tract were dominated by <1.0mm (73.3%) transparent (38.9%) fibers (60.6%), and were mainly composed of polypropylene (53.3%) and polyethylene (34.2%). The highest abundance of MPs was recorded in the gastrointestinal tract of filter-feeding planktivorous fish (7.00 per fish) and the lowest abundance was recorded in the gastrointestinal tract of insectivorous fish (2.57 per fish). From the upper to the lower reaches, the percentage of blue fragment MPs with size <1.0mm in the fish gastrointestinal tract was increasing, while the percentage of yellow/red fiber/film MPs with size >1.0mm was decreasing. This could be attributed to the increase of aquacultural activities, the usage of agricultural films, and a large amount of sewage and industrial wastewater in the lower reaches.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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