Effects of litter decomposition of <i>Gracilaria lemaneiformis</i> segments on environment and its succession characteristics of bacterial community

Hu Xiaojuan; Zhao Xiu; Yang Yufeng; Cao Yucheng

doi:10.12284/hyxb2023102

Volume 45 Issue 8

Aug. 2023

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Hu Xiaojuan，Zhao Xiu，Yang Yufeng, et al. Effects of litter decomposition of Gracilaria lemaneiformis segments on environment and its succession characteristics of bacterial community[J]. Haiyang Xuebao，2023, 45(8)：130–142 doi: 10.12284/hyxb2023102

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Hu Xiaojuan，Zhao Xiu，Yang Yufeng, et al. Effects of litter decomposition of Gracilaria lemaneiformis segments on environment and its succession characteristics of bacterial community[J]. Haiyang Xuebao，2023, 45(8)：130–142 doi: 10.12284/hyxb2023102

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Effects of litter decomposition of Gracilaria lemaneiformis segments on environment and its succession characteristics of bacterial community

doi: 10.12284/hyxb2023102

Hu Xiaojuan^1
,,
Zhao Xiu^{1, 2},
Yang Yufeng^{2, 3
,
,},
Cao Yucheng^{1, 3
,
,}

1.
Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs/Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China
2.
Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
3.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

Received Date: 2022-12-05
Rev Recd Date: 2023-04-03

Available Online: 2023-08-29

Publish Date: 2023-08-31

Abstract

Abstract

In order to clarify the effects of litter decomposition of Gracilaria lemaneiformis segments on environment and the succession of bacterial community, the characteristics of nutrient content in seaweed, water and sediment, and succession characteristics of bacterial community attached to the seaweed, water and sediment were carried out by the simulation experiment. The results showed that its decomposition rate reached 83.5% after 50 d. The content of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in water increased by 241.2%, 229.8% and 101.3%, respectively, compared with the initial period. The content of dissolved oxygen (DO) in water decreased by 82.9%, which from 1.87 mg/L to 0.32 mg/L. In addition, the number of bacteria attached to G. lemanei-formis remained at 10⁷ copy/g, while the richness and diversity of bacteria continued to increase during the decomposition processes. The bacteria community structure was significantly affected by total organic carbon, total nitrogen, total phosphorus and DO in water. The relative abundances of Planctomycetes, Spirochaetae, Firmicutes and δ-Proteobacteria increased, while that of Bacteroidetes, α-Proteobacteria and γ-Proteobacteria decreased. During the process of decomposition, the functional gene abundance of metabolism attached to G. lemaneiformis continued to decline. Briefly, the results indicated that decomposition of G. lemaneiformis segments would lead to the increasing of nutrient concentration in water. And Planctomycetes, Spirochaetae, Firmicutes and δ-Proteobacteria played important roles in the process of decomposing of G. lemaneiformis.
- Gracilaria lemaneiformis,
- decompose,
- environmental factors,
- bacterial community

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References

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