The spatial-temporal distributions of heterotrophic bacteria in seawater of the northern Beibu Gulf

He Cheng; Xu Sha; Song Shuqun; Li Caiwen

doi:10.3969/j.issn.0253-4193.2019.04.009

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He Cheng, Xu Sha, Song Shuqun, Li Caiwen. The spatial-temporal distributions of heterotrophic bacteria in seawater of the northern Beibu Gulf[J]. Haiyang Xuebao, 2019, 41(4): 94-108. doi: 10.3969/j.issn.0253-4193.2019.04.009

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He Cheng, Xu Sha, Song Shuqun, Li Caiwen. The spatial-temporal distributions of heterotrophic bacteria in seawater of the northern Beibu Gulf[J]. Haiyang Xuebao, 2019, 41(4): 94-108. doi: 10.3969/j.issn.0253-4193.2019.04.009

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The spatial-temporal distributions of heterotrophic bacteria in seawater of the northern Beibu Gulf

doi: 10.3969/j.issn.0253-4193.2019.04.009

1.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Marine Ecology and Environmental Science Laboratory, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China
2.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Marine Ecology and Environmental Science Laboratory, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China

Received Date: 2018-06-04
Rev Recd Date: 2018-09-19

Abstract

Abstract

From September 2016 to August 2017, the spatial and temporal distributions of heterotrophic bacteria were studied based on monthly cruise in the northern Beibu Gulf, to reveal their correlation with major environmental factors. The heterotrophic bacteria abundances range in (2.75~56.86)×10⁵ cell/mL, with an average of (11.01±6.31)×10⁵ cell/mL. Generally, they are higher in the summer and spring, while lower in the autumn and winter. Heterotrophic bacteria are densely distributed in the coastal water, and gradually reduce in the southwest offshore. The vertical distribution of heterotrophic bacteria is evenly distributed in the coastal areas, and the seasonal stratification that the surface bacteria abundance is higher and bottom bacteria abundance is lower occurred in sea areas below 20 m. The principal components analysis reveals that the distribution of heterotrophic bacteria is influenced by temperature. The correlations between temperature and heterotrophic bacteria are significantly negative in autumn and winter, while significantly positive in spring and summer. The heterotrophic bacteria abundance correlates negatively with salinity, and positively with chlorophyll a and dissolved oxygen. It suggests that salinity and primary production of phytoplankton affect the spatial and temporal distribution of heterotrophic bacteria. Excluding summer, inorganic nutrients negatively correlate with the heterotrophic bacteria, which is indirectly affected by phytoplankton biomass. Spatial-temporal distributions of heterotrophic bacteria are mainly influenced by temperature, salinity, chlorophyll a and dissolved oxygen.
- heterotrophic bacteria,
- Beibu Gulf,
- spatial-temporal distribution,
- environmental factors

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References(43)

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