There is limited knowledge on the relative influences of deterministic and stochastic processes on prokaryotic and fungal communities in lake sediments. In this study, we surveyed the prokaryotic and fungal community compositions and their influencing factors in 23 surface sediments from six lakes on the Qinghai-Tibetan Plateau (QTP) with the use of Illumina sequencing. The results showed the distribution of prokaryotic and fungal communities in the studied QTP lake sediments was shaped by different assembly processes, with prokaryotes primarily governed by variable selection and homogenizing dispersal (accounting for 57.9% and 37.3% of the observed variations) and fungi being mainly regulated by variable selection, non-dominant processes and homogenizing dispersal (38.3%, 43.7% and 13.7%, respectively). Regarding the variable selection, mineralogical variables played key roles in shaping prokaryotic and fungal community structures. Collectively, these findings expand current knowledge concerning the influences of deterministic (e.g. variable selection) and stochastic processes (e.g. homogenizing dispersal and non-dominant processes) on the prokaryotic and fungal distribution in the QTP lakes.

中文翻译：

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矿物质在驱动青藏湖表层沉积物中原核和真菌群落中起关键作用。

关于确定性和随机过程对湖泊沉积物中原核生物和真菌群落的相对影响的知识知之甚少。在这项研究中，我们使用Illumina测序技术对青藏高原（QTP）六个湖泊的23个表面沉积物中的原核和真菌群落组成及其影响因素进行了调查。结果表明，所研究的QTP湖泊沉积物中原核和真菌群落的分布是由不同的组装过程形成的，原核生物主要受变量选择和均质分散控制（分别占观察到的变异的57.9％和37.3％），而真菌主要是由变量选择，非主导过程和均质分散控制（分别为38.3％，43.7％和13.7％）。关于变量选择，矿物学变量在塑造原核和真菌群落结构中起关键作用。总的来说，这些发现扩大了有关确定性（例如变量选择）和随机过程（例如均化分散过程和非主要过程）对QTP湖泊中原核和真菌分布的影响的现有知识。