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The Yellow Sea Cold Water Mass (YSCWM), acting as a distinct physical barrier, forms a stable, low-temperature, high-salinity environment; however, the mechanisms by which it influences the distribution patterns of benthic microeukaryotes and the associated environmental drivers remain poorly understood. In this study, we systematically characterized microeukaryotic communities in sediment samples collected from two stations in the Bohai Sea and fifteen stations located within and surrounding the YSCWM, using environmental DNA (eDNA) sequencing with the 18S rDNA gene as the molecular marker. The results show that Dinoflagellata constituted the dominant taxonomic group both within and outside the YSCWM; however, the microeukaryotic community structures of the two regions differed significantly (ANOSIM: R=0.576 3, P=0.001). Compared with regions outside the YSCWM, communities within the YSCWM exhibited lower species richness (median: 1 529 vs. 1 672) but displayed a more complex co-occurrence network structure (4 062 vs. 3 138 edges), suggesting greater potential ecosystem stability. Deterministic processes, particularly heterogeneous selection, predominantly govern community assembly, in which water depth exerts a stronger influence on communities outside the OYSCWM communities, whereas temperature and median sediment grain size play more critical roles in shaping communities within the YSCWM. These findings demonstrate that the YSCWM plays a critical role in structuring sedimentary microeukaryote communities and highlights environmental DNA (eDNA) technology as an effective approach for elucidating marine microbial biogeographic patterns and evaluating ecosystem structure.
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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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