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An Approximate Homogeneous Turbulence Simulation system was employed to systematically explore algal responses to the interactive effects of turbulence and salinity by integrating the regulatory roles of these interactions on photosynthesis, nutrient metabolism, extracellular polymeric substances secretion, and grazing activities. It was demonstrated that at the biomass level, the damage to algae caused by turbulence was enhanced at 1‰ salinity, with Chl-a content in the low- and high-turbulence groups being 0.37 and 1.41 times that of the still-water group, respectively. At 4‰ salinity, damage was mitigated, with Chl-a content in these groups being 0.82 and 2.29 times that of the still-water group. This phenomenon was attributed to the regulation of algal photosynthetic efficiency and nutrient utilization rate by salinity. At the community structure level, the energy metabolism was enhanced by the increased salinity, which resulted in a lower water pH, thereby providing a competitive advantage to diatoms and leading to their dominance within the phytoplankton community. However, gas exchange and the shift in zooplankton composition were intensified by the elevated turbulence, mitigating the competitive advantage of diatoms caused by increased salinity. Consequently, the proportion of cyanobacteria increases, reinstating them as the dominant phylum.
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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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