Composition and assembly of bacterial communities in surface and deeper sediments from aquaculture-influenced sites in E
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Aquatic Sciences
RESEARCH ARTICLE
Composition and assembly of bacterial communities in surface and deeper sediments from aquaculture‑influenced sites in Eastern Lake Taihu, China Mengyu Qin1 · Huimin Xu1,2 · Jin Zeng2 · Dayong Zhao1,3 · Zhongbo Yu1 · Qinglong L. Wu2,4 Received: 23 February 2020 / Accepted: 3 September 2020 © Springer Nature Switzerland AG 2020
Abstract Although aquaculture provides a stable and high-quality source of food, the environmental effects related to large-scale industrial aquacultural activities have raised concern. To identify the influence of aquacultural activities on sedimentary bacterial communities, we collected surface and deeper sediments from a series of sites subjected to varying intensities of aquacultural activities within Eastern Lake Taihu, China. The associated physicochemical properties were measured, and 16S rRNA gene sequencing was applied to determine the related bacterial communities in sediment. The diversity and composition of bacterial communities within the surface sediments differed significantly from those of the deeper sediment samples. Marked differences were also found between the surface sediments of the aquaculture-influenced and non-aquaculturally influenced sites. More importantly, phylogenetic structure analysis indicated that stochastic processes dominated the assembly of the bacterial communities; yet, the relative contribution of deterministic processes to bacterial community assembly was greater in the aquacultural zones than in the non-aquacultural zones. Furthermore, we identified total phosphorus (TP) as the most important factor driving the assembly of bacterial communities influenced by aquaculture in sediment. These findings provide useful information for ecological assessments and remediation strategies for aquaculture-influenced ecosystems. Keywords Aquaculture · Sediment · Bacterial community · Community assembly
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00027-020-00755-7) contains supplementary material, which is available to authorized users. * Jin Zeng [email protected] * Dayong Zhao [email protected] 1
Joint International Research Laboratory of Global Change and Water Cycle, State Key Laboratory of Hydrology‑Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, People’s Republic of China
2
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China
3
The Experimental Teaching Center of Water Resources, Hohai University, Nanjing 210098, People’s Republic of China
4
Sino‑Danish Centre for Education and Research, University of Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
Introduction As the decline of marine and freshwater wild-capture fisheries, aquaculture plays a significant role in global food supply. The contribution of aquaculture to total global fish production nearly doubled between 1996 and 2
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