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Based on the data from the zooplankton survey in the waters around the Ningde nuclear power plant in January (winter), April (spring), July (summer) and November (autumn) 2018, the structure and seasonal changes of jellyfish communities in the area were analyzed. The potential risks of jellyfish to the safe production of nuclear power in Ningde were discussed. The results showed that there were seasonal changes in the species composition, abundance distribution and dominant species succession of jellyfish in the Ningde nuclear power plant area. The numbers of jellyfish species in the spring, summer, autumn and winter were 7, 16, 9 and 3, respectively. The mean abundances were (45.48±8.24) ind./m3, (50.26±12.13) ind./m3, (3.68±1.91) ind./m3, and (0.18±0.07) ind./m3, respectively. The main dominant species were Laodicea indica, Pleurobrachia globosa, Diphyes chamissonis and Euphysa aurata. The seasonal succession of dominant species was obvious. The correlation analysis between the change of jellyfish abundance and environmental factors showed that the abundance of jellyfish in spring and summer was significantly related to the total abundance of zooplankton, and its number was significantly related to the number of copepods in zooplankton in summer（p<0.05, R=0.363). The abundance of jellyfish communities in autumn and winter was mainly affected by salinity. The salinity of the sea area was relatively low in autumn and winter, and the temperature is also low, so the abundance of jellyfish was also low. According to the distribution characteristics of jellyfish in Ningde, the jellyfish abundance of 50 ind./m3 was considered as the risk threshold value, and summer was the potentially high-risk season for ecological disasters. It was necessary to focus on the 5−20 km away from the intake area in summer; followed by the spring, the focus was on the 2.5−5 km away from the intake area; in autumn and winter, the safety of nuclear power sources was basically not caused by jellyfish.
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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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