

FOLLOWUS
1.College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
2.Institute for Eco-environmental Research of Sanyang Wetland, Wenzhou University, Wenzhou 325035, China
3.Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental & Resource Sciences, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China
yanxiufeng@wzu.edu.cn
wenliu@zafu.edu.cn
Received:25 January 2024,
Published:01 January 2025
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WU Shengwei,ZOU Huixi,LI Nan,et al.Heavy metal stress strengthens the stability and complexity of microbial molecular ecological networks in Sanyang wetland sediments[J].Journal of Oceanology and Limnology,2025,43(01):103-118.
Pollution from heavy metals (HMs) (Cd
As
Cr
and Ni
etc.) has become a serious environmental issue in urban wetland ecosystems with more and more attention. Previous studies conducted in agricultural soils
rivers
and lakes demonstrated that microbial communities exhibit a response to HM pollution. Yet
little is known about the response of microbial communities to HM pollution in urban wetland ecosystems. We examined how heavy metals affect the stability of the microbial networks in the sediments of Sanyang wetland
Wenzhou
China. Key environmental parameters
including HMs
TC (total carbon)
TN (total nitrogen)
TP (total phosphorus)
S
and pH
varied profoundly between moderately and heavily polluted areas in shaping microbial communities. Specifically
the microbial community composition in moderately polluted sites correlated significantly (
P
<
0.05) with Ni
Cu
Cd and TP
whereas in heavily polluted sites
they correlated significantly with Cd
TN
TP
and S. Results show that the heavily polluted sites demonstrated more intricate and more stable microbial networks than those of the moderately polluted area. The heavily polluted sites exhibited higher values for various network parameters including total nodes
total links
average degree
average clustering coefficient
connectance
relative modularity
robustness
and cohesion. Moreover
the structural equation modeling analysis demonstrated a positive correlation between the stability of microbial networks and Cd
TN
TP
and S in heavily polluted site
s. Conversely
in moderately polluted sites
the correlation was positively linked to Cd
Ni
and sediment pH. It implies that Cd could potentially play a crucial role in affecting the stability of microbial networks. This study shall enhance our comprehension of microbial co-occurrence patterns in urban wetland ecosystems and offer insights into the ways in which microbial communities respond to environmental factors in varying levels of HM pollution.
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