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According to the data of four voyages of zooplankton survey in the southwest of Bohai Sea from August 2020 to May 2021, the community structure and seasonal variation of small medusae were analyzed, and the effects of environmental factors on the abundance of small medusae were discussed. There were seasonal variations in species composition and abundance distribution of small medusae in the southwest of Bohai Sea, a total of 13 species of small medusae were found throughout the year, including 11 species of hydromedusae and 2 species of ctenophores. The number of medusae species in spring, summer, autumn and winter were 4, 9, 7 and 2 species respectively. The mean abundance values were 30.74 ind./m3, 30.78 ind./m3, 12.08 ind./m3 and 0.57 ind./m3 respectively. The dominant species were Sugiura chengshanense, Rathkea octopunctata, Eirene ceylonensis, Clytia hemisphaerica, Pleurobrachia globosa. The average seasonal replacement rate of dominant species was 91.67%, showing obvious seasonal succession. Water temperature and salinity were main environmental factor affecting the seasonal variation of total abundance of small medusae in the southwest of Bohai Sea. The increase of water temperature and nutrients in spring promote the growth and reproduction of small medusae. In summer, copepods provided rich bait for small medusae to promote its growth, the community was mainly affected by salinity in autumn. According to the risk species of small medusae in the southwest of Bohai Sea, it was speculated that the peak of risk species in summer and autumn was a risk to the planned nuclear power.
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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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