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Response of Heterotrophic Bacteria Abundance and Community Structure to Asian Dust Addition in the Oligotrophic Northwest Pacific Ocean

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Abstract

The dust storms from the continent usually affect the abundance and diversity of planktons by supplying trace elements. As such, the response of heterotrophic planktonic bacteria to dusts, nutrients (i.e., nitrogen and phosphorus) or ferrous dosages was investigated in the Kuroshio Extension region of the Northwest Pacific Ocean (NWPO) through on-board incubation experiments during an oceanographic survey in spring 2014. The flow cytometry and 16S rRNA high-throughput sequencing methods were applied to explore the abundance and community structure of bacteria, and the percentage of high nucleic acid bacteria (HNA%). The results showed that the heterotrophic bacteria abundance was low (average 2.55× 105cells mL-1) and subjected to both nitrogen (N) and ferrous (Fe) limitation. Sand-dust deposition observably promoted the activity of heterotrophic planktonic bacteria. The maximum abundance of heterotrophic bacteria was 6.98 ×105cells mL-1 in the dust-dosage group, which was 44% higher than the control (P<0.05). The HNA% in the dust-dosage group was 1.37 times higher than the control (P<0.05). The activation mechanism was mainly related to the dissolution of N and Fe in the dusts. The relative abundance of genus Winogradskyella was significantly increased by dust deposition while the relative abundance of the genera Tenacibaculum and Hyphomonas was decreased. These variations of bacterial community structure were ascribed to the dissolution of nutrients N and P. Comparing the results of different experimental groups, this study concluded that dust storm improved the abundance of heterotrophic bacteria by dissolution of N and Fe.

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Acknowledgements

This work was funded by the National Natural Science Foundation of China (No. 41210008), and the Major State Basic Research Development Program of China (973 Program No. 2014CB953701).

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Authors and Affiliations

  1. College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China

    Xi Chen, Xiaohao Zhang, Yangguo Zhao, Guangxing Liu, Chao Zhang & Huiwang Gao

  2. Beijing Sound Environmental Engineering Co. Ltd., Beijing, 101102, China

    Xiaohao Zhang

  3. Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, China

    Yangguo Zhao, Guangxing Liu, Chao Zhang & Huiwang Gao

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  1. Xi Chen
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  2. Xiaohao Zhang
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  3. Yangguo Zhao
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  4. Guangxing Liu
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  5. Chao Zhang
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  6. Huiwang Gao
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Correspondence to Yangguo Zhao or Guangxing Liu.

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Chen, X., Zhang, X., Zhao, Y. et al. Response of Heterotrophic Bacteria Abundance and Community Structure to Asian Dust Addition in the Oligotrophic Northwest Pacific Ocean. J. Ocean Univ. China 19, 722–728 (2020). https://doi.org/10.1007/s11802-020-4126-9

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  • DOI: https://doi.org/10.1007/s11802-020-4126-9

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