Deterministic processes dominate archaeal community assembly from the Pearl River to the northern South China Sea.
Deterministic processes dominate archaeal community assembly from the Pearl River to the northern South China Sea.
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DOI：
10.3389/fmicb.2023.1185436
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发表时间：
2023
影响因子：
5.2
通讯作者：
中科院分区：
文献类型：
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河口沉积物在河口营养盐的生态地球化学循环中起着重要的作用。然而，对其装配过程的全面研究仍然显着不足。本研究系统研究了珠江上游至南海北方600 km范围内水体和表层沉积物中古菌群落的动态变化，并区分了低盐和高盐类群。中性群落模型分析和零模型分析表明，C值均大于2，表明确定性过程在低盐和高盐条件下均能主导浮游或底栖古菌群落的聚集。从PR到NSCS，低盐环境中的确定性过程比高盐环境中的贡献更大。通过共现网络分析发现，低盐度组古菌群落间的相互作用较强，负相互作用比例较高，这可能是由于低盐度组古菌群落营养盐浓度反映出的环境异质性较大所致。总的来说，我们的工作系统地研究了水以及沉积物中的古菌群落的组成和共生网络，从PR到NSCS，对河口的古菌群落组装机制产生了新的见解。
Archaea play a significant role in the biogeochemical cycling of nutrients in estuaries. However, comprehensive researches about their assembly processes remain notably insufficient. In this study, we systematically examined archaeal community dynamics distinguished between low-salinity and high-salinity groups in water and surface sediments over a 600-kilometer range from the upper Pearl River (PR) to the northern South China Sea (NSCS). Neutral community model analysis together with null model analysis showed that their C-score values were greater than 2, suggesting that deterministic processes could dominate the assembly of those planktonic or benthic archaeal communities at both the low-salinity and high-salinity sites. And deterministic processes contributed more in the low-salinity than high-salinity environments from the PR to the NSCS. Furthermore, through the co-occurrence network analysis, we found that the archaeal communities in the low-salinity groups possessed closer interactions and higher proportions of negative interactions than those in the high-salinity groups, which might be due to the larger environmental heterogeneities reflected by the nutrient concentrations of those low-salinity samples. Collectively, our work systematically investigated the composition and co-occurrence networks of archaeal communities in water as well as sediments from the PR to the NSCS, yielding new insights into the estuary’s archaeal community assembly mechanisms.