Lin Xizheng, Zhang Chuanlun, Xie Wei
School of Marine Sciences, Sun Yat-sen University, Zhuhai, China.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China.
Front Microbiol. 2023 Jun 22;14:1185436. doi: 10.3389/fmicb.2023.1185436. eCollection 2023.
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.
古菌在河口营养物质的生物地球化学循环中发挥着重要作用。然而，关于它们的组装过程的全面研究仍然明显不足。在本研究中，我们系统地研究了从珠江上游到南海北部600公里范围内，低盐度和高盐度组在水体和表层沉积物中的古菌群落动态。中性群落模型分析和空模型分析表明，它们的C得分值大于2，这表明确定性过程可能主导低盐度和高盐度站点浮游或底栖古菌群落的组装。从珠江到南海北部，确定性过程在低盐度环境中比在高盐度环境中贡献更大。此外，通过共现网络分析，我们发现低盐度组的古菌群落比高盐度组具有更紧密的相互作用和更高比例的负相互作用，这可能是由于那些低盐度样本的营养浓度所反映的更大的环境异质性。总的来说，我们的工作系统地研究了从珠江到南海北部水体和沉积物中古菌群落的组成和共现网络，为河口古菌群落组装机制提供了新的见解。
