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[Objective] Roseobacter play a significant ecological role in the material cycling and energy flow of marine ecosystems. However, their environmental responses on long time scales and community assembly mechanisms remain unclear. We collected samples over 60 consecutive weeks from the coastal waters near Qingdao to investigate the annual dynamics, environmental responses, and community assembly mechanisms of free-living and particle-associated Roseobacter. [Methods] The 16S rRNA gene amplicon sequencing was performed for the surface seawater samples to reveal the seasonal diversity variations of Roseobacter groups with different lifestyles. Furthermore, the correlations of Roseobacter with various environmental factors and the community assembly mechanisms were explored. [Results] In the surface seawater of the coastal zone, the relative abundance of Roseobacter in total bacteria and archaea exhibited significant seasonal fluctuations (2.64%-34.10%), with being markedly higher in winter and spring than in summer and autumn. Based on the temporal distribution patterns, Roseobacter groups can be classified into summer-autumn, winter-spring, and outbreak growth types. The free-living Roseobacter groups showed more pronounced seasonal patterns, while the particle-associated groups showed higher diversity. Temperature, inorganic nitrogen, and inorganic phosphorus were the main environmental factors influencing Roseobacter diversity, with their explanatory power on particle-associated groups (16.82%) being higher than that on free-living groups (9.06%). In terms of community assembly, deterministic processes had a greater impact on particle-associated Roseobacter groups, indicating that environmental changes had more significant effects on these groups. [Conclusion] This study, by examining the dynamic changes and environmental driving mechanisms of Roseobacter at a fine time scale, reveals their seasonal distribution patterns and provides scientific insights for understanding the spatiotemporal dynamics and ecological functions of this crucial marine bacterial group.
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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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