Yuan Haijun, Zhang Weizhen, Yin Huaqun, Zhang Runyu, Wang Jianjun
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China.
Front Microbiol. 2022 Nov 3;13:998496. doi: 10.3389/fmicb.2022.998496. eCollection 2022.
Microbial beta diversity has been recently studied along the water depth in aquatic ecosystems, however its turnover and nestedness components remain elusive especially for multiple taxonomic groups. Based on the beta diversity partitioning developed by Baselga and Local Contributions to Beta Diversity (LCBD) partitioning by Legendre, we examined the water-depth variations in beta diversity components of bacteria, archaea and fungi in surface sediments of Hulun Lake, a semi-arid lake in northern China, and further explored the relative importance of environmental drivers underlying their patterns. We found that the relative abundances of , , , and increased toward deep water, while , , and decreased. For bacteria and archaea, there were significant ( < 0.05) decreasing water-depth patterns for LCBD and LCBD (i.e., species replacement), while increasing patterns for total beta diversity and turnover, implying that total beta diversity and LCBD were dominated by species turnover or LCBD. Further, bacteria showed a strong correlation with archaea regarding LCBD, total beta diversity and turnover. Such parallel patterns among bacteria and archaea were underpinned by similar ecological processes like environmental selection. Total beta diversity and turnover were largely affected by sediment total nitrogen, while LCBD and LCBD were mainly constrained by water NO -N and NO -N. For fungal community variation, no significant patterns were observed, which may be due to different drivers like water nitrogen or phosphorus. Taken together, our findings provide compelling evidences for disentangling the underlying mechanisms of community variation in multiple aquatic microbial taxonomic groups.
近年来，人们对水生生态系统中沿水深方向的微生物β多样性进行了研究，然而其周转和嵌套组分仍然难以捉摸，尤其是对于多个分类群而言。基于巴塞尔加（Baselga）提出的β多样性划分方法以及勒让德（Legendre）提出的局部对β多样性的贡献（LCBD）划分方法，我们研究了中国北方半干旱湖泊呼伦湖表层沉积物中细菌、古菌和真菌β多样性组分的水深变化，并进一步探讨了驱动其模式的环境因素的相对重要性。我们发现，[具体物种]、[具体物种]、[具体物种]和[具体物种]的相对丰度向深水方向增加，而[具体物种]、[具体物种]和[具体物种]则减少。对于细菌和古菌，LCBD和LCBD（即物种替代）存在显著的（P < 0.05）随水深降低的模式，而总β多样性和周转则呈增加模式，这意味着总β多样性和LCBD由物种周转或LCBD主导。此外，细菌在LCBD、总β多样性和周转方面与古菌表现出很强的相关性。细菌和古菌之间的这种平行模式是由环境选择等类似的生态过程支撑的。总β多样性和周转在很大程度上受沉积物总氮的影响，而LCBD和LCBD主要受水体中NO₃-N和NO₂-N的限制。对于真菌群落变化，未观察到显著模式，这可能是由于水体氮或磷等不同驱动因素所致。综上所述，我们的研究结果为阐明多个水生微生物分类群群落变化的潜在机制提供了有力证据。
