Summer Distributional Characteristics of Surface Phytoplankton Related with Multiple Environmental Variables in the Korean Coastal Waters SCIE SCOPUS

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Title
Summer Distributional Characteristics of Surface Phytoplankton Related with Multiple Environmental Variables in the Korean Coastal Waters
Author(s)
Youn, Ji Nam; Lee, Min Ji; Jin, Hyun Keun; Lim, Young Kyun; Ro, Hye Joo; Park, Young Gyu; Baek, Seung Ho
KIOST Author(s)
Youn, Ji Nam(윤지남)Jin, Hyunkeun(진현근)Lim, Young Kyun(임영균)Park, Young Gyu(박영규)Baek, Seung Ho(백승호)
Alternative Author(s)
윤지남; 진현근; 임영균; 박영규; 백승호
Publication Year
2022-07
Abstract
Multiple environmental variables related to ocean currents, freshwater runoff, and up-welling in a coastal area have complex effects on the phytoplankton community. To assess the influence of environmental variables on the phytoplankton community structure during the summer of 2019, we investigated the various abiotic and biotic factors in Korean coastal waters (KCWs), separated into five different zones. Summer environmental factors in KCWs were strongly influenced by Changjiang Diluted Water (CDW) in St. SO (Southern Offshore) 1 and 2, upwelling in St. SI (Southern Inshore) 2-4, and Nakdong River discharge in St. SI 12. In particular, low-salinity water masses (p < 0.05 for nearby locations) of CDW gradually expanded from the East China Sea to southwestern KCWs from June to July. In addition, there were high levels of nutrients following freshwater runoff from the Nakdong River in southeastern KCW, which led to the dominance of Cryptomonas spp. (81%), a freshwater and brackish water algae. On the other hand, upwelling areas in southwestern KCW were dominated by diatoms Skeletonema spp., and are characterized by high phosphate concentrations (p < 0.05) and low temperatures (p < 0.05) compared to nearby locations. Leptocylindrus danicus (20%) was dominant due to the effect of water temperature in the SE (Southeastern area) zone. Low nutrient concentrations were maintained in the East Sea (dissolved inorganic nitrogen (DIN) = 0.39 +/- 0.40 mu M; dissolved inorganic phosphate (DIP) = 0.09 +/- 0.03 mu M) and the Yellow Sea (DIN = 0.40 +/- 0.07 mu M; DIP = 0.04 +/- 0.02 mu M), which were characterized by low levels of chlorophyll a and dominated by unidentified small flagellates (35, 40%). Therefore, our results indicated that hydro-oceanographic events such as upwelling and freshwater run-off, but not ocean currents, provide nutrients to the euphotic layers of the coastal environment and play important roles in determining the phytoplankton community structure during summer in the KCWs.
ISSN
2077-1312
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43127
DOI
10.3390/jmse10070850
Bibliographic Citation
JOURNAL OF MARINE SCIENCE AND ENGINEERING, v.10, no.7, 2022
Publisher
MDPI
Keywords
Korean coastal waters; Changjiang Diluted Water (CDW); upwelling; river discharge
Type
Article
Language
English
Document Type
Article
Publisher
MDPI
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