Temporal and spatial dynamics in microbial community composition within a temperate stream network
Temporal and spatial dynamics in microbial community composition within a temperate stream network
复制标题
DOI：
10.1111/1462-2920.14311
复制
发表时间：
2018-10-01
影响因子：
5.1
通讯作者：
Ottesen, Elizabeth A.
中科院分区：
文献类型：
--
作者：
Hassell, Norman;Tinker, Kara A.;Ottesen, Elizabeth A.
溪流的水柱拥有一个独特的微生物群落，该群落与溪流底栖动物和周围土壤的微生物群落不同。这个社区是由复杂的相互作用力所塑造的，包括来自周围环境和河流选择的微生物分散。但是，结构流社区在时空和时间上发生变化的过程仍然很少理解。在这项研究中，我们表征了整个流网络的微生物社区组成的空间和时间趋势，这些流跨越了第一到第五阶流。我们发现，源水流的微生物群落在构图上是多样的，淡水微生物分类群的代表性较低，土壤和与沉积物相关的分类单元的高度表示。在五个季节性采样中的三个中，鉴定出一种继承模式，其中的天然型丰富度和组成异质性降低，而已知的淡水分类单元的比例随着上游累积的树突状距离的增加而增加。但是，在两个采样中，流在整个流域表现出均匀的微生物多样性，而淡水类群的比例与树突状距离没有关系。总体而言，我们的数据表明，驱动流中微生物多样性的继承过程是高度动态的，并且在景观尺度上可能会破坏，这可能会响应温度和降水的变化。
The water column of streams hosts a unique microbial community that is distinct from the microbial communities of the stream benthos and surrounding soil. This community is shaped by complex interacting forces, including microbial dispersal from surrounding environments and in-stream selection. However, how the processes structuring stream communities change over space and time remains poorly understood. In this study, we characterize spatial and temporal trends in microbial community composition throughout a stream network spanning first through fifth order streams. We found that the microbial communities of headwater streams are compositionally diverse, with low representation of freshwater microbial taxa and high representation of soil and sediment-associated taxa. In three out of five seasonal samplings, a successional pattern was identified in which phylotype richness and compositional heterogeneity decreased while the proportion of known freshwater taxa increased with increasing cumulative upstream dendritic distance. However, in two samplings, streams instead exhibited uniformly high microbial diversity across the watershed, and the fraction of freshwater taxa showed no relationship with dendritic distance. Overall, our data suggest that the successional processes that drive microbial diversity in streams are highly dynamic and can be disrupted at landscape scales, potentially in response to variation in temperature and precipitation.