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Characterization of Seasonal Phytoplankton Pigments and Functional Types around Offshore Island in the East/Japan Sea, Based on HPLC Pigment Analysis

Author

Listed:
  • Minji Lee

    (Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje 53201, Korea)

  • Yun-Bae Kim

    (Ulleungdo/Dokdo Ocean Science Station, Korea Institute of Ocean Science and Technology, Ulleung-gun 40205, Korea)

  • Chan-Hong Park

    (East Sea Research Institute, Korea Institute of Ocean Science and Technology, Uljin-gun 36315, Korea)

  • Seung-Ho Baek

    (Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje 53201, Korea)

Abstract

In this study, we investigated the seasonal phytoplankton community and phytoplankton functional types (PFTs) in the vicinity of Dokdo Island, located in the East/Japan Sea, in 2019. With strong seasonal winds, the water column was well mixed in winter. In spring and autumn, the upper mixed layer depth (MLD) was relatively deep, and the Subsurface Chlorophyll Maximum (SCM) formed in the middle layer. Small phytoplankton were dominant in the summer, which is a time of high water temperatures and strong stratification associated with a shallower MLD. Based on CHEMTAX analysis, in spring, the high phytoplankton biomass was mainly derived from cyanobacteria, diatoms, and dinoflagellates. In summer, >73.2% of the surface biomass was comprised of cyanobacteria. In autumn, pelagophytes accounted for the highest proportion of the biomass. The fraction of microphytoplankton ( f micro ) was highest in winter and spring, whereas the fraction of nanophytoplankton ( f nano ) was highest in autumn and summer. A high fraction of picophytoplankton ( f pico ) was evident in the surface layers in summer. Values for both the photoprotection index (PI) and the ratio of photoprotective carotenoids (PPC) to photosynthetic carotenoids (PSC) indicate that this study area had high primary productivity in 2019. In order to predict long-term changes in marine food webs due to climate change, it is important to evaluate the size and composition of phytoplankton.

Suggested Citation

  • Minji Lee & Yun-Bae Kim & Chan-Hong Park & Seung-Ho Baek, 2022. "Characterization of Seasonal Phytoplankton Pigments and Functional Types around Offshore Island in the East/Japan Sea, Based on HPLC Pigment Analysis," Sustainability, MDPI, vol. 14(9), pages 1-17, April.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:9:p:5306-:d:804157
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    References listed on IDEAS

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    1. Scott C. Doney, 2006. "Plankton in a warmer world," Nature, Nature, vol. 444(7120), pages 695-696, December.
    2. Minji Lee & Nam-Il Won & Seung Ho Baek, 2020. "Comparison of HPLC Pigment Analysis and Microscopy in Phytoplankton Assessment in the Seomjin River Estuary, Korea," Sustainability, MDPI, vol. 12(4), pages 1-19, February.
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    Cited by:

    1. Jin Wei & Xiaonan Ji & Wei Hu, 2022. "Characteristics of Phytoplankton Production in Wet and Dry Seasons in Hyper-Eutrophic Lake Taihu, China," Sustainability, MDPI, vol. 14(18), pages 1-11, September.

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