Bacterial communities in cascade reservoirs along a large river
Bacterial communities in cascade reservoirs along a large river
复制标题
大河沿岸梯级水库中的细菌群落
DOI：
10.1002/lno.11967
复制
发表时间：
2021-10-30
影响因子：
4.5
通讯作者：
Ma, Honghai
中科院分区：
文献类型：
--
作者：
Chen, Qiuwen;Chen, Yuchen;Ma, Honghai
水坝的建设是普遍的，改变了水文和地球化学条件，从而改变了地球河流中的细菌群落。到目前为止，知识是缺乏的细菌群落在级联水库。在这里，我们调查了9个梯级水电站水库在1290公里的湄公河上游（澜沧江在中国）的细菌群落和潜在的功能。沿着水库梯级，水温，而不是大坝的存在，是细菌群落组成的地理格局的主要原因。在一个水库，沉积物细菌群落的显着空间差异之间的尾部，中部和头部的水库。库尾和库首流速筛分沉积导致的沉积物性质差异，导致沉积物细菌群落的空间变异，在库中部形成潜在的生态地球化学循环热点。相比之下，与深湖和深单水库不同，浮游细菌群落组成在深梯级水库中没有明显的分层特征，因为水力发电引起的密度诱导的水下水流和对流降低了垂直水环境梯度。这项研究为影响河流水库级联中细菌群落分布和功能的过程提供了一个新的视角，并且是预测全球现有和未来水库中微生物介导的生物地球化学循环后果的第一步。
Dam construction is widespread, changing the hydrological and biogeochemical conditions and thereby the bacterial communities in the rivers of the earth. To date, knowledge is lacking about bacterial communities in cascade reservoirs. Here, we investigated the bacterial communities and potential functions of nine cascade hydropower reservoirs in 1290 km of the upper Mekong River (Lancang River in China). Along the reservoir cascade, the water temperature, rather than the presence of dams, was the main cause for the geographical patterns of bacterial community composition. Within a reservoir, significant spatial differences in sediment bacterial communities were observed between the tail, middle, and head of a reservoir. The differences in sediment properties resulted by flow velocity‐sieved sedimentation from the tail to head of a reservoir caused the spatial variation in sediment bacteria communities, forming potential hotspots for biogeochemical cycling in the middle of the reservoir. In contrast, unlike in deep lakes and deep single reservoirs, the bacterioplankton community composition had no distinctly layered features in the deep cascade reservoirs, because density‐induced underwater currents and convection resulting from hydropower production reduced the vertical hydro‐environmental gradients. This study provides a novel perspective on the processes affecting the distribution and function of bacterial communities in river‐reservoir cascades, and is a first step toward forecasting the consequences of microbially mediated biogeochemical cycling in existing and future reservoirs worldwide.