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The benthic macroinvertebrate is the important ecological group in river ecosystem. The study of the community composition and distribution characteristics on the benthic macroinvertebrate can provide theoretical support for river ecosystem management. In June (summer) and November (autumn) 2018, surveys on the benthic macroinvertebrate with trawl and ground cages were carried out in 16 fixed sampling sites in the inland rivers of Chongming Island. The community composition, distribution characteristics and corresponding influencing factors of the benthic macroinvertebrates were analyzed then. A total of 14 species belonging to 5 orders, 8 families of the benthic macroinvertebrates were collected in the surveys. Most of them were arthropods. Among them, 10 species were freshwater type, 3 species were estuarine brackish water type and 1 species was catadromous migration type. And 12, 6 and 11 benthic macroinvertebrate species were recorded in the Beiheng Canal, Nanheng Canal, and the vertical canals respectively. The dominants of the benthic macroinvertebrates were freshwater species, and the common species were Macrobrachium nipponense, and Exopalaemon modestus. The number of species, abundance and biomass of the benthic macroinvertebrates in the Beiheng Canal and the vertical canals were higher than those in the Nanheng Canal. The number of species, abundance and biomass of the benthic macroinvertebrates in the summer were higher than those in the autumn. Seasonal variations were one of the important features of the characteristics of the benthic macroinvertebrate assemblages in the inland rivers of Chongming Island. Add all these together, the inland rivers of Chongming Island had some characteristics of both estuaries and inland rivers, which were related to the geographical location, hydrological conditions, riverine habitats, water quality characteristics and regional human activities of the Chongming Island.
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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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