Salinity reduces bacterial diversity, but increases network complexity in Tibetan Plateau lakes
Salinity reduces bacterial diversity, but increases network complexity in Tibetan Plateau lakes
复制标题
盐度降低了青藏高原湖泊的细菌多样性，但增加了网络复杂性
DOI：
10.1093/femsec/fiz190
复制
发表时间：
2019-12-01
影响因子：
4.2
通讯作者：
Zhu, Liping
中科院分区：
文献类型：
--
作者：
Ji, Mukan;Kong, Weidong;Zhu, Liping
盐度是影响湖泊沃茨中浮游细菌群落的重要环境因子之一，但其对细菌间相互作用的影响研究较少。本文研究了盐度对青藏高原湖泊细菌多样性、相互作用和群落结构的影响。我们的研究结果表明，咸水湖（盐度在0.5和50 g/L之间）与淡水湖（< 0.5 g/L）相比，具有相似甚至更高的细菌多样性，而超咸水湖（> 50 g/L）表现出最低的多样性。网络分析表明，超咸水湖表现出最高的网络复杂性，具有较高的总相关数（特别是负相关），但较低的网络模块数比淡水和咸水湖。此外，盐度占主导地位解释了细菌群落结构的变化在盐湖，而那些在淡水和超咸水湖的主要解释了水温和地理空间距离，分别。核心业务分类单位（OTU），这是无处不在的，在所有湖泊中，是不太敏感的增加盐度比指示OTU的存在依赖于湖泊类型。我们的研究结果提供了一个新的认识，盐度如何影响高原湖泊中的细菌群落。
Salinity is one of the most important environmental factors influencing bacterial plankton communities in lake waters, while its influence on bacterial interactions has been less explored. Here, we investigated the influence of salinity on the bacterial diversity, interactions and community structure in Tibetan Plateau lakes. Our results revealed that saline lakes (salinity between 0.5 and 50 g/L) harboured similar or even higher bacterial diversity compared with freshwater lakes (< 0.5 g/L), while hyper-saline lakes (> 50 g/L) exhibited the lowest diversity. Network analysis demonstrated that hyper-saline lakes exhibited the highest network complexity, with higher total correlation numbers (particularly the negative correlations), but lower network module numbers than freshwater and saline lakes. Furthermore, salinity dominantly explained the bacterial community structure variations in saline lakes, while those in freshwater and hyper-saline lakes were predominately explained by water temperature and geospatial distance, respectively. The core operational taxonomic units (OTUs), which were ubiquitously present in all lakes, were less sensitive to enhancing salinity than the indicative OTUs whose presence was dependent on lake type. Our findings offer a new understanding of how salinity influences bacterial community in plateau lakes.