PDF(Pubmed)
Abstract：
Different types of inlet water are expected to affect microbial communities of lake ecosystems due to changing environmental conditions and the dispersal of species. However, knowledge of the effects of changes in environmental conditions and export of microbial assemblages on lake ecosystems is limited, especially for glacier-fed lakes. Here, we collected water samples from the surface water of a glacier-fed lake and its two fed streams on the Tibetan Plateau to investigate the importance of glacial and non-glacial streams as sources of diversity for lake bacterial communities. Results showed that the glacial stream was an important source of microorganisms in the studied lake, contributing 45.53% to the total bacterial community in the lake water, while only 19.14% of bacterial community in the lake water was seeded by the non-glacial stream. Bacterial communities were significantly different between the glacier-fed lake and its two fed streams. pH, conductivity, total dissolved solids, water temperature and total nitrogen had a significant effect on bacterial spatial turnover, and together explained 36.2% of the variation of bacterial distribution among habitats. Moreover, bacterial co-occurrence associations tended to be stronger in the lake water than in stream habitats. Collectively, this study may provide an important reference for assessing the contributions of different inlet water sources to glacier-fed lakes.
摘要：
由于环境条件的变化和物种的扩散，预计不同类型的进水将影响湖泊生态系统的微生物群落。然而,对环境条件变化和微生物组合出口对湖泊生态系统的影响的了解有限，尤其是冰川湖泊。这里,我们从青藏高原的冰川供养湖及其两个供养溪流的地表水中收集了水样，以研究冰川和非冰川溪流作为湖泊细菌群落多样性来源的重要性。结果表明，冰川流是所研究湖泊中微生物的重要来源，对湖水中细菌群落总数的贡献为45.53%。湖水中只有19.14％的细菌群落由非冰川流播种。冰川喂养的湖泊和两个喂食的溪流之间的细菌群落显着不同。pH值,电导率，总溶解固体，水温和总氮，对细菌空间周转有显著影响，一起解释了生境之间细菌分布变化的36.2％。此外，湖水中的细菌共生关系往往比溪流生境中的细菌共生关系更强。总的来说，这项研究可能为评估不同入口水源对冰川湖泊的贡献提供重要参考。
