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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-243
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-243
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  24 Jul 2020

24 Jul 2020

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A revised version of this preprint is currently under review for the journal BG.

Impacts of biogenic polyunsaturated aldehydes on metabolism and community composition of particle-attached bacteria in coastal hypoxia

Zhengchao Wu1,2, Qian P. Li1,2,3, Zaiming Ge1,3, Bangqin Huang4, and Chunming Dong5 Zhengchao Wu et al.
  • 1State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
  • 2Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China
  • 3College of Marine Science, University of the Chinese Academy of Sciences, Beijing, China
  • 4Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China
  • 5Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, MNR, Xiamen, China

Abstract. Eutrophication-driven coastal hypoxia is of great interest recently, though its mechanisms are not fully understood. Here, we showed elevated concentrations of particulate and dissolved polyunsaturated aldehydes (PUAs) associated with the hypoxic waters meanly dominated by particle-attached bacteria (PAB) in the bottom water of a salt-wedge estuary. Particle-adsorbed PUAs of ~ 10 micromoles per liter particle in the hypoxic waters were directly quantified for the first time using large-volume-filtration followed with on-site derivation and extraction of the adsorbed PUAs. PUAs-amended incubation experiments for PAB retrieved from the low-oxygen waters were also performed to explore the impacts of PUAs on the growth and metabolism of PAB and associated oxygen utilization. We found an increase in cell growth of PAB in response to low-dose PUAs (1 μmol L−1) but an enhanced cell-specific metabolic activity in response to high-dose PUAs (100 μmol L−1) including bacterial respiration and production. Improved cell-specific metabolism of PAB in response to high-dose PUAs was also accompanied by a significant shift of PAB community structure with increased dominance of genus Alteromonas within the Gammaproteobacteria. We thus conclude that a high PUAs concentration within the bottom layer may be important for species such as Alteromonas to regulate PAB community structure and lead to the enhancement of oxygen utilization during the degradation of particulate organic matters and thus contribute to the formation of coastal hypoxia. These findings are potentially important for coastal systems with large river inputs, intense phytoplankton blooms driven by eutrophication, as well as strong hypoxia developed below the salt-wedge front.

Zhengchao Wu et al.

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Zhengchao Wu et al.

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Short summary
Seasonal hypoxia in the nearshore bottom waters frequently occurs in the Pearl River Estuary. Aerobic respiration is the ultimate cause of local hypoxia. We found an elevated level of polyunsaturated aldehydes in the bottom water outside the estuary, which promoted growth and metabolisms of special groups of particle-attached bacteria and thus contributed to oxygen depletion in hypoxic waters. Our results may be important for understanding of coastal hypoxia and their linkages to eutrophication.
Seasonal hypoxia in the nearshore bottom waters frequently occurs in the Pearl River Estuary....
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