Effects of nutrient loading on sediment bacterial and pathogen communities within seagrass meadows

文献类型： 外文期刊

第一作者： Liu, Songlin

作者： Liu, Songlin;Jiang, Zhijian;Wu, Yunchao;Zhang, Jingping;Zhao, Chunyu;Huang, Delian;Huang, Xiaoping;Liu, Songlin;Wu, Yunchao;Zhao, Chunyu;Huang, Delian;Huang, Xiaoping;Deng, Yiqin;Trevathan-Tackett, Stacey M.

作者机构：

关键词： bacteria; denitrification; eutrophication; putative pathogens; seagrass meadows

期刊名称：MICROBIOLOGYOPEN （ 影响因子：3.139； 五年影响因子：3.503 ）

ISSN： 2045-8827

年卷期： 2018 年 7 卷 5 期

页码：

收录情况： SCI

摘要： Eutrophication can play a significant role in seagrass decline and habitat loss. Microorganisms in seagrass sediments are essential to many important ecosystem processes, including nutrient cycling and seagrass ecosystem health. However, current knowledge of the bacterial communities, both beneficial and detrimental, within seagrass meadows in response to nutrient loading is limited. We studied the response of sediment bacterial and pathogen communities to nutrient enrichment on a tropical seagrass meadow in Xincun Bay, South China Sea. The bacterial taxonomic groups across all sites were dominated by the Gammaproteobacteria and Firmicutes. Sites nearest to the nutrient source and with the highest NH4+ and PO43- content had approximately double the relative abundance of putative denitrifiers Vibrionales, Alteromonadales, and Pseudomonadales. Additionally, the relative abundance of potential pathogen groups, especially Vibrio spp. and Pseudoalteromonas spp., was approximately 2-fold greater at the sites with the highest nutrient loads compared to sites further from the source. These results suggest that proximity to sources of nutrient pollution increases the occurrence of potential bacterial pathogens that could affect fishes, invertebrates and humans. This study shows that nutrient enrichment does elicit shifts in bacterial community diversity and likely their function in local biogeochemical cycling and as a potential source of infectious diseases within seagrass meadows.

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