Bacterioplankton Metacommunity Processes across Thermal Gradients: Weaker Species Sorting but Stronger Niche Segregation in Summer than in Winter in a Subtropical Bay
Bacterioplankton Metacommunity Processes across Thermal Gradients: Weaker Species Sorting but Stronger Niche Segregation in Summer than in Winter in a Subtropical Bay
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跨温度梯度的浮游细菌群落过程：亚热带海湾夏季的物种分类较弱，但生态位隔离比冬季更强
DOI：
10.1128/aem.02088-18
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发表时间：
2018-10
影响因子：
4.4
通讯作者：
Wu Qinglong
中科院分区：
文献类型：
--
作者：
Ren Lijuan;Song Xingyu;He Dan;Wang Jianjun;Tan Melting;Xia Xiaomin;Li Gang;Tan Yehui;Wu Qinglong
核电站的热排放极大地改变了接收海水的环境和生态条件，但人们对其对微生物生态的影响的了解有限。本文利用16S rRNA基因的高通量测序技术，研究了中国南海北部亚热带海湾两个典型季节(冬季和夏季)海洋浮游细菌群落跨温度梯度的集合。我们发现，浮游细菌群落组成(BCC)在温度梯度和季节之间具有高度的异质性。热流出物产生的空间结构温度梯度是BCC的关键决定因素，但其影响因季节而异。利用集合群落的方法，我们发现在热排水区，即水与周围海水和热排出水交换频繁的地方，BCC的空间格局是由物种分类而不是周围海水的质量效应或热排出水被周围海水稀释而形成的。然而，夏季海水的这种分选效果弱于冬季海水。在这两个季节，浮游细菌群落结构主要由生态位共享决定，但在夏季海水中，生态位分离的相对重要性增强。我们的研究结果表明，在不同强度的热影响下，亚热带夏季海水的BCC对温度的敏感性高于冬季海水，对于群落过程的季节性差异，BCC更难预测。了解跨环境梯度细菌群落聚集机制的重要性是海洋微生物生态学的主要目标之一。两座核电站排出的热污水在亚热带大亚湾已经存在了20多年，并产生了相对稳定和较长的热梯度(温度从0摄氏度上升到10摄氏度)。温度梯度上的环境斑块是异质的，在微生物尺度上具有很强的相互关联性；因此，这是一个有用的模型，用于研究作为海洋浮游细菌组装基础的元群落过程(即斑块动力学、物种分类、质量效应和中性过程)。我们的研究意义在于揭示环境条件和与扩散相关的过程如何相互作用来影响浮游细菌的集合过程以及它们在温度梯度上的季节差异。我们的研究结果可能会促进对未来全球变暖条件下海洋微生物生态的理解。
Thermal effluents from nuclear power plants greatly change the environmental and ecological conditions of the receiving marine water body, but knowledge about their impact on microbial ecology is limited. Here we used high-throughput sequencing of the 16S rRNA gene to examine marine bacterioplankton metacommunity assembly across thermal gradients in two representative seasons (i.e., winter and summer) in a subtropical bay located on the northern coast of the South China Sea. We found high heterogeneity in bacterioplankton community compositions (BCCs) across thermal gradients and between seasons. The spatially structured temperature gradient created by thermal effluents was the key determinant of BCCs, but its influence differed by season. Using a metacommunity approach, we found that in the thermal discharge area, i.e., where water is frequently exchanged with surrounding seawater and thermal effluent water, the BCC spatial patterns were shaped by species sorting rather than by mass effects from surrounding seawater or by dilution of thermal effluent water by surrounding seawater. However, this effect of species sorting was weaker in summer than in winter seawater. In both seasons, the bacterioplankton community structure was predominately determined by niche sharing; however, the relative importance of niche segregation was enhanced in summer seawater. Our findings suggest that for the seasonal differences in metacommunity processes, the BCCs of subtropical summer seawater were more sensitive to temperature and were more difficult to predict than those of winter seawater in the face of different intensities of thermal impacts. IMPORTANCE Understanding the mechanisms of bacterial community assembly across environmental gradients is one of the major goals of marine microbial ecology. Thermal effluents from two nuclear power plants have been present in the subtropical Daya Bay for more than 20 years and have generated a comparatively stable and long thermal gradient (a temperature increase from 0 to 10 degrees C). The environmental patches across thermal gradients are heterogeneous and very strongly interconnected on a microbial scale; thus, this is a useful model for the study of the metacommunity processes (i.e., patch dynamics, species sorting, mass effects, and neutral processes) that underlie marine bacterioplankton assembly. The significance of our research is to reveal how environmental conditions and dispersal-related processes interact to influence bacterioplankton metacommunity processes and their seasonal differences across thermal gradients. Our results may advance the understanding of marine microbial ecology under future conditions of global warming.
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影响因子：
2.7
作者：
E. Poornima;M. Rajadurai;T. Rao;B. Anupkumar;R. Rajamohan;S. V. Narasimhan;V. Rao;V. P. Venugopalan-V.-P.-Venu
通讯作者：
E. Poornima;M. Rajadurai;T. Rao;B. Anupkumar;R. Rajamohan;S. V. Narasimhan;V. Rao;V. P. Venugopalan-V.-P.-Venu
DOI：
--
发表时间：
2014
期刊：
--
影响因子：
--
作者：
Alberto Pascual
通讯作者：
Alberto Pascual
影响因子：
1.4
作者：
R. Rivkin;Anderson;C. Lajzerowicz
通讯作者：
R. Rivkin;Anderson;C. Lajzerowicz
影响因子：
4.4
作者：
Webster, NS;Wilson, KJ;Hill, RT
通讯作者：
Hill, RT
影响因子：
2.5
作者：
D. Choi;Jong Soo Park;C. Hwang;S. Huh;B. Cho
通讯作者：
D. Choi;Jong Soo Park;C. Hwang;S. Huh;B. Cho