scholarly journals The Lifestyle-Dependent Microbial Interactions Vary Between Upstream and Downstream of the Three Gorges Dam

2021 ◽  
Vol 9 ◽  
Author(s):  
Shang Wang ◽  
Weiguo Hou ◽  
Hongchen Jiang ◽  
Hailiang Dong ◽  
Liuqin Huang ◽  
...  
Keyword(s):  
Matrix Theory ◽  
Microbial Interactions ◽  
Three Gorges Dam ◽  
Rrna Gene ◽  
Strong Impact ◽  
Three Gorges ◽  
Free Living ◽  
Microbial Distribution ◽  
The Three Gorges ◽  
The Three Gorges Dam

Dams represent the most significant anthropogenic disturbance to global rivers. Previous studies have shown that free-living and particle-attached microbes exhibited differentially in river and reservoir ecosystems. However, little is known about the dam’s effect on their co-occurrence patterns. Here, a random matrix theory (RMT)-based network approach was used to construct microbial ecological networks for free-living and particle-attached communities in the immediate vicinity of the Three Gorges Dam (TGD), based on a high-throughput sequencing of 16S rRNA gene. Microbial distribution pattern showed that differences caused by lifestyle (free-living vs. particle-attached) were greater than those caused by geographic position (upstream vs. downstream of the TGD). Network analysis revealed higher connectivity and a lower number of modules in the overall downstream networks. Furthermore, considering the lifestyle, the network structures and properties for free-living and particle-attached microbes were different between upstream and downstream of the dam. Specifically, free-living communities located upstream of the dam exhibited a more complex co-occurrence pattern than the particle-attached communities, whereas the opposite was true for those located downstream of the dam. This variation indicated a strong impact of the dam on microbial interactions for microbes with similar lifestyle in the vicinity of the dam. We identified 112 persistent operational taxonomic unit (OTU)-level species that stably coexisted regardless of lifestyle and geographic positions. These persistent species occupied 21.33–25.57% of the total nodes in each network, and together with their first neighbors, they contributed more than 50% of the nodes and edges belonging to each network. Furthermore, we found that taxonomic affiliations for central nodes (with high degree) varied in these persistent species sub-networks. Collectively, our findings expand the current understanding of the dam’s effect on species interaction variation patterns for free-living and particle-attached communities in the vicinity of the dam, which are more complex than traditional alpha and beta microbial diversity.

scholarly journals New evidence of Yangtze delta recession after closing of the Three Gorges Dam

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
X. X. Luo ◽  
S. L. Yang ◽  
R. S. Wang ◽  
C. Y. Zhang ◽  
P. Li
Keyword(s):  
Three Gorges Dam ◽  
Three Gorges ◽  
Yangtze Delta ◽  
The Three Gorges ◽  
New Evidence ◽  
The Three Gorges Dam

Variation in early growth ofNeosalanx taihuensisbetween two populations above and below the Three Gorges Dam, China

2013 ◽  
Vol 28 (1) ◽  
pp. 139-146
Author(s):  
Wangbao Gong ◽  
Lang Wu ◽  
Shouqi Xie ◽  
Jiashou Liu ◽  
Brian R. Murphy ◽  
...  
Keyword(s):  
Early Growth ◽  
Three Gorges Dam ◽  
Three Gorges ◽  
The Three Gorges ◽  
Two Populations ◽  
The Three Gorges Dam

scholarly journals Influences of the Three Gorges Dam in China on precipitation over surrounding regions

2017 ◽  
Vol 31 (4) ◽  
pp. 767-773 ◽  
Author(s):  
Yan Li ◽  
Weican Zhou ◽  
Xianyan Chen ◽  
Dexian Fang ◽  
Qianqian Zhang
Keyword(s):  
Three Gorges Dam ◽  
Three Gorges ◽  
The Three Gorges ◽  
The Three Gorges Dam

Relationship between Waterway Depth and Low-Flow Water Levels in Reaches below the Three Gorges Dam

2019 ◽  
Vol 145 (1) ◽  
pp. 04018032 ◽  
Author(s):  
Yunping Yang ◽  
Mingjin Zhang ◽  
Wanli Liu ◽  
Jianjun Wang ◽  
Xiaoxing Li
Keyword(s):  
Water Levels ◽  
Three Gorges Dam ◽  
Low Flow ◽  
Three Gorges ◽  
The Three Gorges ◽  
The Three Gorges Dam

scholarly journals Response of vegetation to submergence along Jingjiang Reach of the Yangtze River

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251015
Author(s):  
Guoliang Zhu ◽  
Yitian Li ◽  
Zhaohua Sun ◽  
Shinjiro Kanae
Keyword(s):  
Yangtze River ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
High Elevation ◽  
Three Gorges Dam ◽  
Vegetation Coverage ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges ◽  
The Three Gorges Dam

This work explores the changes in vegetation coverage and submergence time of floodplains along the middle and lower reaches of the Yangtze River (i.e., the Jingjiang River) and the relations between them. As the Three Gorges Dam has been operating for more than 10 years, the original vegetative environment has been greatly altered in this region. The two main aspects of these changes were discovered by analyzing year-end image data from remote sensing satellites using a dimidiate pixel model, based on the normalized difference vegetation index, and by calculating water level and topographic data over a distance of 360 km from 2003–2015. Given that the channels had adjusted laterally, thus exhibiting deeper and broader geometries due to the Three Gorges Dam, 11 floodplains were classified into three groups with distinctive features. The evidence shows that, the floodplains with high elevation have formed steady vegetation areas and could hardly be affected by runoff and usually occupied by humans. The low elevation group has not met the minimal threshold of submerging time for vegetation growth, and no plants were observed so far. Based on the facts summed up from the floodplains with variable elevation, days needed to spot vegetation ranges from 70 to 120 days which happened typically near 2006 and between 2008 and 2010, respectively, and a negative correlation was detected between submergence time and vegetation coverage within a certain range. Thus, floods optimized by the Three Gorges Dam have directly influenced plant growth in the floodplains and may also affect our ability to manage certain types of large floods. Our conclusions may provide a basis for establishing flood criteria to manage the floodplain vegetation and evaluating possible increases in resistance caused by high-flow flooding when these floodplains are submerged.

Movement of the Shuping landslide in the first four years after the initial impoundment of the Three Gorges Dam Reservoir, China

Landslides ◽  
2008 ◽  
Vol 5 (3) ◽  
pp. 321-329 ◽  
Author(s):  
Fawu Wang ◽  
Yeming Zhang ◽  
Zhitao Huo ◽  
Xuanming Peng ◽  
Kiminori Araiba ◽  
...  
Keyword(s):  
Three Gorges Dam ◽  
Three Gorges ◽  
Dam Reservoir ◽  
The Three Gorges ◽  
The Three Gorges Dam
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