Eutrophication increases deterministic processes and heterogeneity of co-occurrence networks of bacterioplankton metacommunity assembly at a regional scale in tropical coastal reservoirs
Eutrophication increases deterministic processes and heterogeneity of co-occurrence networks of bacterioplankton metacommunity assembly at a regional scale in tropical coastal reservoirs
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富营养化增加了热带沿海水库区域尺度浮游细菌群落组装共现网络的确定性过程和异质性
DOI：
10.1016/j.watres.2021.117460
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发表时间：
2021-07-31
期刊：
影响因子：
12.8
通讯作者：
Ren，Lijuan
中科院分区：
文献类型：
--
作者：
Zhang，Jiexiang;Chen，Ye;Ren，Lijuan
了解微生物元群落组合和潜在的甲烷作用是水生生态学的基本目标。然而，作为水生生态系统的主要水质问题，富营养化是如何在区域尺度上调节水库浮游细菌元群落的。在这项研究中，我们应用元群落框架研究了在潮湿的夏季从42个热带沿海水库收集的210个样本中的浮游细菌群落。研究发现，区域尺度上浮游细菌群落组成的空间格局主要受物种分选的影响。水库营养状态指数（TSI）是决定浮游细菌元群落聚集的关键因素。当∆TSI < 20时，BCC周转率随各站点间TSI差异（∆TSI）显著增加，但当∆TSI为bbb20时，BCC周转率保持在80%左右。与中营养型和寡营养型水库相比，富营养型水库共生浮游细菌网络和浮游细菌β多样性的异质性增加。我们认为浮游植物群落组合的较大变化可能在控制浮游细菌元群落组合中起直接或间接的决定性作用，并成为富营养化水库中观察到的较高BCC异质性背后的潜在机制。我们的研究有助于更广泛地了解富营养化对水库生态系统的生态效应，并为热带沿海水库的管理提供线索。
Understanding microbial metacommunity assembly and the underlying methanisms are fundamental objectives of aquatic ecology. However, little is known about how eutrophication, the primary water quality issue of aquatic ecosystems, regulates bacterioplankton metacommunity assembly at a regional scale in reservoirs. In this study, we applied a metacommunity framework to study bacterioplankton communities in 210 samples collected from 42 tropical coastal reservoirs in the wet summer season. We found that the spatial pattern of bacterioplankton community compositions (BCCs) at a regional scale was shaped mainly by species sorting. The reservoir trophic state index (TSI) was the key determinant of bacterioplankton metacommunity assembly. BCC turnover increased significantly with the TSI differences between sites (∆TSI) when ∆TSI was < 20, but remained at a level of about 80% when ∆TSI was > 20. Compared to oligo-mesotrophic and mesotrophic reservoirs, increased heterogeneity of co-occurrence bacterioplankton networks and bacterioplankton β-diversity were observed across eutrophic reservoirs. We propose that larger variation in phytoplankton community assembly may play directly or indirectly deterministic processes in controlling the bacterioplankton metacommunity assembly and became the potential mechanisms behind the observed higher BCC heterogeneity across the eutrophic reservoirs. Our research contributes to a broader understanding of the ecological effects of eutrophication on reservoir ecosystems and provides clues to the management of the tropical coastal reservoirs.