Preprints
https://doi.org/10.5194/os-2021-67
https://doi.org/10.5194/os-2021-67

  06 Jul 2021

06 Jul 2021

Review status: this preprint is currently under review for the journal OS.

Vertical stratification driven nutrient ratios to regulate phytoplankton community structure in the oligotrophic western Pacific Ocean

Zhuo Chen1,3, Jun Sun2,3, Ting Gu3, Guicheng Zhang3, and Yuqiu Wei4 Zhuo Chen et al.
  • 1College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
  • 2College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China
  • 3Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin 300457, China
  • 4Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China

Abstract. Vertical stratification determined the variability of temperature and nutrient distribution in upper seawater, thereby affecting the primary production of the ocean. Nutrients in the oligo-trophic region vary in time and space, and thus phytoplankton vary in their vertical distribution. However, the differences in the vertical distribution of phytoplankton have not been systematically studied. This study investigated the spatial distribution pattern and diversity of phytoplankton communities in the western Pacific Ocean (WPO) in the autumn of 2016, 2017 and 2018, as well as the local hydrological and nutritional status. The Utermöhl method was used to analyze the relevant ecological characteristics of phytoplankton in the surveyed sea area. In the three cruises investigated, we show universal relationships between phytoplankton and (1) vertical stratification, (2) N : P ratio (3) temperature and salinity. The potential influencing factors of physical and chemical parameters on phytoplankton abundance were analyzed by structural equation model (SEM), determining the vertical stratification index was the most important influence factor affecting phytoplankton abundance and indirectly on phytoplankton abundance by dissolved inorganic nitrogen (DIN) and Dissolved inorganic phosphorus (DIP). Vertical stratification determines the vertical distribution of the phytoplankton community structure in the WPO. The areas with strong vertical stratification (Group A and B) are more conducive to the growth of cyanobacteria, and the areas with weak vertical stratification (Group C and D) are more conducive to the bloom of diatoms and dinoflagellates.

Zhuo Chen et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-67', Anonymous Referee #1, 04 Aug 2021
    • AC1: 'Reply on RC1', Jun Sun, 16 Aug 2021
  • RC2: 'Comment on os-2021-67', Anonymous Referee #2, 08 Aug 2021
    • AC2: 'Reply on RC2', Jun Sun, 16 Aug 2021
      • RC3: 'Reply on AC2', Anonymous Referee #2, 18 Aug 2021
        • AC3: 'Reply on RC3', Jun Sun, 19 Aug 2021

Zhuo Chen et al.

Zhuo Chen et al.

Viewed

Total article views: 466 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
352 101 13 466 4 5
  • HTML: 352
  • PDF: 101
  • XML: 13
  • Total: 466
  • BibTeX: 4
  • EndNote: 5
Views and downloads (calculated since 06 Jul 2021)
Cumulative views and downloads (calculated since 06 Jul 2021)

Viewed (geographical distribution)

Total article views: 440 (including HTML, PDF, and XML) Thereof 440 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 23 Oct 2021
Download
Short summary
We studied the phytoplankton community in the western Pacific Ocean. The interannual variation of phytoplankton was not significant and the vertical stratification index was the most important potential influencing factor on phytoplankton. Indirect effects of nutrient salinity on phytoplankton abundance. Areas with severe vertical stratification were more suitable for cyanobacteria, and areas with weak vertical stratification were more suitable for diatoms and dinoflagellates.