Distribution of chromophytic phytoplankton in the Western Subarctic Gyre of Pacific Ocean revealed by morphological observation and <italic style="font-style: italic">rbc</italic>L gene sequences

Tao JIANG; Xiaohan QIN; Guannan WU; Huaxian ZHAO; Xiaotao YU; Xueyan XIAO; Wenjing LIU; Qingjing HU; Jufa CHEN; Nan LI

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Distribution of chromophytic phytoplankton in the Western Subarctic Gyre of Pacific Ocean revealed by morphological observation and rbcL gene sequences

Ecology | Updated：2024-10-12

- Distribution of chromophytic phytoplankton in the Western Subarctic Gyre of Pacific Ocean revealed by morphological observation and rbcL gene sequences
- Journal of Oceanology and Limnology Vol. 41, Issue 6, Pages: 2166-2179(2023)
- Affiliations：
  
  1.School of Ocean, Yantai University, Yantai 264005, China
  2.Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
  3.Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, Nanning 530001, China
  4.State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
  5.School of Medicine, Yunnan University, Kunming 650091, China
  6.College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
- Author bio：
  
  chenjf@ysfri.ac.cn
  nli0417@163.com
- Funds：
- DOI：
  CLC：
- Received：19 April 2022，
  
  Accepted：22 August 2022，
  
  Online First：15 October 2022，
  
  Published：01 November 2023
- Accepted：
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JIANG Tao,QIN Xiaohan,WU Guannan,et al.Distribution of chromophytic phytoplankton in the Western Subarctic Gyre of Pacific Ocean revealed by morphological observation and rbcL gene sequences[J].Journal of Oceanology and Limnology,2023,41(06):2166-2179.
DOI：

JIANG Tao,QIN Xiaohan,WU Guannan,et al.Distribution of chromophytic phytoplankton in the Western Subarctic Gyre of Pacific Ocean revealed by morphological observation and rbcL gene sequences[J].Journal of Oceanology and Limnology,2023,41(06):2166-2179. DOI：

摘要

Abstract

Western Subarctic Gyre (WSG)

which possesses distinctive differences in oceanographic and biogeochemical processes

is situated in the northwest subarctic Pacific. The WSG is characterized by high nutrient and low chlorophyll. We carried out a field investigation in this area in summer 2020 and performed microscopic observation

cytometric counting

and RuBisCO large subunit (

rbc

L) gene analysis to understand the community structure and spatial distribution of chromophytic phytoplankton better. Microscopic method revealed that total phytoplankton (

10 μm

including Bacillariophyta

Dinoflagellata

Ochrophyta

and Chlorophyta) abundances ranged (0.6×10

)–(167.4×10

) cells/L with an increasing trend from south to north. Dinoflagellates and Pennatae diatoms dominated the phytoplankton assemblages in the southern and northern stations

respectively. Major chromophytic phytoplankton groups derived from

rbc

L genes included Haptophyta

Ochrophyta

Bacillariophyta

as well as rarely occurring groups

such as Xanthophyta

Cyanobacteria

Dinoflagellata

Rhodophyta

and Cryptophyta. At the phylum level

Haptophyta was the most abundant phylum

accounting for approximately 30.80% of the total obtained operational taxonomic units in all samples. Ochrophyta and Bacillariophyta were the second and third most abundant phylum

and their relative abundance was 20.26% and 19.60%

respectively. Further

redundancy analysis showed that high proportion of diatoms (e.g.

microscopic and

rbc

L methods) was posit

ively correlated with nutrients (e.g.

dissolved inorganic nitrogen (DIN)

dissolved inorganic phosphorous

and dissolved silicate (DSi)) and negatively correlated with temperature and salinity. The proportion of Ochrophyta

Rhodophyta

and Cyanobateria identified by

rbc

L genes was positively correlated with salinity and temperature and showed negative correlation to nutrients. This work is the first molecular study of phytoplankton accomplished in the WSG

and our results show some discrepancies between morphological observation and

rbc

L gene sequences

which highlight the necessity of combining the microscopic and molecular methods to reveal the diversity of phytoplankton in marine environment.

关键词

Keywords

references

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Distribution of chromophytic phytoplankton in the Western Subarctic Gyre of Pacific Ocean revealed by morphological observation and rbcL gene sequences

DOI：

摘要

Abstract

关键词

Keywords

references