Phytoplankton and Primary Production

Choi, Joong Ki; Noh, Jae Hoon; Orlova, T. Yu.; Park, Mi-Ok; Lee, Sang‐Heon; Park, Young-Je; Son, Seung-Hyun; Стоник, И. В.; Choi, Dong Han

doi:10.1007/978-3-319-22720-7_10

Cited by 8 publications

(3 citation statements)

References 43 publications

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“…The phytoplankton community affects both the magnitude of PP and the export efficiency of POC (Edwards et al, 2015;Basu and Mackey, 2018). The phytoplankton community of the EJS is characterized by the abundance and diversity of diatoms, dinoflagellates, and cyanobacteria (Choi et al, 2016). Diatoms are abundant in most of the regions, whereas the cyanobacteria abundance is comparatively high in the open waters (Kim S. Y. et al, 2021).…”

Section: Plankton Communitymentioning

confidence: 99%

Carbon cycling in the East Sea (Japan Sea): A review

Kim

Hwang²,

Kim³

et al. 2022

Front. Mar. Sci.

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The East Sea (also known as the Japan Sea; hereafter, EJS) is a semi-enclosed marginal sea surrounded by the Korean Peninsula, Russia, and the Japanese Islands. The EJS is connected to the Pacific through shallow straits. Thus, the EJS has its own thermohaline circulation and the characteristic biogeochemistry. The deep overturning circulation plays a critical role in carbon cycling including absorption of atmospheric CO2 and its sequestration into the interior of the sea. The turnover time of the deep EJS (>1000 m) is ~ hundred years and probably varies depending on physical climate forcing. Thus, the effect of climate change on oceanic processes may be more easily detected in the EJS. In this paper, we summarize the current understanding of carbon cycling in the EJS. We focus especially on the Ulleung Basin in the southwestern EJS, from which more extensive data are available. Notable features of carbon cycling in the EJS include the following: primary productivity and the export/production ratio are higher than in the adjacent Pacific; the EJS is a net sink of atmospheric CO2 and anthropogenic CO2 content is ~1% of the dissolved inorganic carbon inventory; dissolved inorganic carbon in the sea interior is mostly supplied by organic matter decomposition rather than CaCO3 dissolution and thus, the deep waters are vulnerable to acidification; N:P molar ratio of the deep waters is ~13, lower than the Redfield ratio; concentration of dissolved organic carbon is significantly higher than in the oceans; and sediment resuspension and lateral transport is an important component of sinking particulate organic carbon (POC) flux. Another important feature is the temporal trends observed for the last few decades. For example, pH, calcium carbonate saturation status, and dissolved oxygen concentration in the sea interior have decreased, whereas dissolved inorganic carbon and likely, the inventory of anthropogenic CO2 have increased. These temporal trends have an implication on better understanding of the processes occurring more slowly in the oceans. Brief suggestions for future research that will improve our understanding of carbon cycling and its variability are provided at the end of the paper.

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Section: Plankton Communitymentioning

confidence: 99%

Carbon cycling in the East Sea (Japan Sea): A review

Kim

Hwang²,

Kim³

et al. 2022

Front. Mar. Sci.

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“…Studies on seasonal variation have mainly focused on biomass, which greatly increases in spring despite the area being in the open ocean [49]. In addition, picosized plankton have been detected more often in the East Sea [50].…”

Section: Seasonal Phytoplankton Dynamicsmentioning

confidence: 99%

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

et al. 2022

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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 (fmicro) was highest in winter and spring, whereas the fraction of nanophytoplankton (fnano) was highest in autumn and summer. A high fraction of picophytoplankton (fpico) 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.

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“…The ES has a coastal terrace with a simple, linear coastline, where diatom distribution is mainly affected by two major currents-the S-trending Liman Current, and the N-trending Tsushima Current. These currents meet and form the subpolar fronts and mesoscale eddies that influence phytoplankton community structure and distribution in this area (Choi, et al 2016). In our study, the ES diatom-based ecoregions were divided into distinct southern and northern groups.…”

Section: Indicator Species In Each Diatom-based Ecoregionmentioning

confidence: 88%

Diatom-based ecoregions and diagnostic indicator species for Korean coastal waters in winter

Park¹,

Lee²,

Jung³

et al.

Authorea

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Diatoms are a globally successful and eukaryotic photosynthetic group with an ornamented silica external wall. The relationship between their thecal diversity and habitat means that diatoms can be used as bioindicators to characterize the aquatic environment. To estimate the distribution and diversity of diatom communities during winter in South Korean coastal waters, we collected phytoplankton samples from 114 coastal sites. We applied the unweighted pair-group technique using the arithmetic averages clustering method to cluster the sampling sites-apart from those where the biota consisted of other groups, such as dinoflagellates-into four ecoregions: Yellow Sea (YS), Southern Sea (SS), Southern East Sea (SES), and Northern East Sea (NES). Indicator species analysis in each ecoregion led to the selection of tychoplanktonic, chain-forming, stalk-forming, and psychrophilic indicator diatoms, each of which represented a planktonic lifestyle associated with one of the four ecoregions. This study shows the diatom community to serve as bioindicators of Korean coastal water ecoregions, and the subsequent seasonal survey will provide a starting point for the improved understanding of Korean diatom-based ecoregions, in both time and space.

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Phytoplankton and Primary Production

Cited by 8 publications

References 43 publications

Carbon cycling in the East Sea (Japan Sea): A review

Carbon cycling in the East Sea (Japan Sea): A review

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

Diatom-based ecoregions and diagnostic indicator species for Korean coastal waters in winter

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