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首页> 外文期刊>Freshwater science >Longitudinal variation of microbial communities in benthic biofilms and association with hydrological and physicochemical conditions in glacier-fed streams
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Longitudinal variation of microbial communities in benthic biofilms and association with hydrological and physicochemical conditions in glacier-fed streams

机译：冰川生物膜中微生物群落的纵向变异及冰川饲料流中水文和物理化学条件的关系

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Glacier-fed streams are highly dynamic environments that integrate upstream catchment processes and are prominent geomorphological and ecological components of alpine landscapes. In these systems, hydrological and physicochemical factors change significantly with location downstream of the glacier. Variation in microbial communities in benthic biofilms along such gradients are not well studied, nor do we understand how hydrological and physicochemical factors drive those changes. We characterized microbial community structure in 2 glacier-fed streams in the Tianshan Mountains, central Asia, by sequencing 16S ribosomal (r)RNA genes in benthic biofilms and documented abiotic environmental conditions. Alpha diversity indices of microbes in benthic biofilms (number of operational taxonomic units, evenness, phylogenetic diversity) were significantly related to hydrological factors, including distance to glacier (G(D)), glacier area proportion (G(A)), and glacier source proportion (G(S)), and physicochemical factors, including water temperature, pH, dissolved organic C (DOC), total N (TN), and NO3. The dominant phyla were Proteobacteria (46% of operational taxonomic units [OTUs]), Cyanobacteria (16%), Bacteroidetes (12%), Actinobacteria (9%), and Acidobacteria (6%). Microbial communities differed longitudinally along the stream at the OTU level and even at the phylum level. Correlation, canonical correlation, and network analyses showed that the microbes had significant associations with hydrological (G(A), G(S), and G(D)), biogeochemical (TN, NO3, DOC, total P, and soluble reactive P), and physicochemical (pH) factors. These results add to our knowledge of microbial community structure and potential drivers of that structure in glacier-fed stream ecosystems and provide potentially valuable data for assessing future dynamics as these systems experience further disruption caused by the influences of climate change.
机译：冰川喂食溪流是高度动态的环境，整合上游集水过程，并且是高山景观的突出地貌和生态部件。在这些系统中，水文和物理化学因素随着冰川下游的位置而变化。沿着这样的渐变的底栖生物膜中微生物群落的变异都没有很好地研究，我们也没有了解水文和物理化学因素如何驱动这些变化。通过在底栖生物膜中测序16S核糖体（R）RNA基因并记录非生物环境条件，在天山山脉中的2个冰川喂食溪流中的微生物群落结构。底栖生物膜中微生物的α多样性指数（操作分类单位，均匀性，系统发育单位）与水文因素有显着相关，包括与冰川的距离（g（d）），冰川面积比例（g（a））和冰川源比例（g（s））和物理化学因子，包括水温，pH，溶解有机C（DOC），总N（TN）和NO3​​。占优势的植物是植物聚糖（46％的运作分类单位[otus]），蓝藻（16％），菌体（12％），肌动菌（9％）和抗酸杆菌（6％）。微生物社区沿着OTU水平的溪流纵向差异，甚至在门水平。相关性，规范相关性和网络分析表明微生物与水文（G（a），g（s）和g（d）），生物地造理（tn，no3，doc，总P和可溶性反应性p有显着关联）和物理化学（pH）因素。这些结果增加了我们对冰川喂水流生态系统中该结构的微生物群落结构和潜在驱动因素的知识，并提供了评估未来动态的潜在有价值的数据，因为这些系统经历了气候变化影响造成的进一步破坏。

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