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Based on the nutrients and hydrological environment parameters collected during April (spring, before green tides) and July (summer, later stage of green tides) cruise, and the daily satellite monitoring data of green tides in the southern Yellow Sea (SYS) in 2018, we studied the spatio-temporal variations of the floating Ulva prolifera green tide and it's relationship with nutrients. The results showed that small scales of floating U. prolifera patches were firstly observed in the coastal area of Nantong, Jiangsu Province on April 25, and decomposed and disappeared in the coast of Shandong Peninsula in the mid-August. The trajectory area of floating green tides was mainly in the western of 122°E in the SYS, and the rapid growth phase of green tides existed in the south of 35°N, nearshore area of Jiangsu Province. Nutrients showed regional characteristics of high values in the coastal area of Jiangsu Province and low values in the offshore of the northern and eastern parts of the study area, which influenced by the Yellow Sea Cold Water Mass, freshwater influx, biological uptake and utilization, and other factors. Compared with the development trend of green tides and distributions of nutrients, there were three distinct characteristic zones with different nutrients conditions and stages of green tides: the coastal area of Jiangsu Province (south of 35°N, east of 122°E), characterized with high-value nutrients and rapid growth of green tides; the offshore area of Shandong Peninsula (north of 35°N, east of 122°E), characterized with low nutrients and dissipation phase of green tides; the east sea of 122°E, characterized with no green tides. The nutrients variations in different characteristic zones indicated that rich and sufficient nutrients (${\rm{NO}}_3^- $-N>6.5 μmol/L, ${\rm {PO}}_4^{3-} $-P>0.27 μmol/L), and continuous nutrients inputs were the main factors contributing the germination and rapid growth of U. prolifera, and provided main N, P elements for the development of green tides in the coastal area of Jiangsu Province. The poor nutrients (DIN<2 μmol/L, ${\rm {PO}}_4^{3-} $-P<0.03 μmol/L in summer) might be the limiting factor limiting the continuous development of green tides in the offshore ocean of the Shandong Peninsula.
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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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