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Variability in the Carbon and Nitrogen Uptake Rates of Phytoplankton Associated With Wind Speed and Direction in the Marian Cove, Antarctica

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Title
Variability in the Carbon and Nitrogen Uptake Rates of Phytoplankton Associated With Wind Speed and Direction in the Marian Cove, Antarctica
Other Titles
남극 마리안소만의 바람세기와 방향에 따른 식물플랑크톤 탄소 및 질소 섭취율 변동성 연구
Authors
Kim, Bo Kyung
Jeon, Misa
Park, Sang-Jong
Kim, Hyun-cheol
민준오
Park, Jisoo
Ha, Sun-Yong
Keywords
AntarcticaMarian Covecarbon uptake ratephytoplanktonstable isotope
Issue Date
2022
Citation
Kim, Bo Kyung, et al. 2022. "Variability in the Carbon and Nitrogen Uptake Rates of Phytoplankton Associated With Wind Speed and Direction in the Marian Cove, Antarctica". FRONTIERS IN MARINE SCIENCE, 9(1): 1-14.
Abstract
Quantifying the temporal variability in phytoplankton productivity is essential for improving our understanding of carbon (C) and nitrogen (N) dynamics and energy flows in natural aquatic ecosystems. Samples were collected at three-day intervals from December 2018 to January 2019 from fixed station in Marian Cove, Antarctica to determine the C and N (NO3- and NH4+) uptake by phytoplankton. Considerable fluctuations in the total C and N productivities were observed, which led to dynamic changes in the phytoplankton communities and a stronger coupling between the phytoplankton biomass. The increased rate of NO3- uptake coincided with an enhanced C uptake mainly by microphytoplankton (>20 μm), followed by an increase in NH4+ uptake towards the end of sampling period. However, the <2 μm fraction (picophytoplankton) showed little variation in C and NO3- uptake, and the proportions of assimilated NH4+ contributed to more than half of the total assimilated inorganic N. The increased NH4+ did not increase the total phytoplankton biomass and C production. Interestingly, after January 9 (maximum chlorophyll a, C, and N uptake) there was a shift to a predominantly easterly wind (>6 m s-1), which rapidly decreased the total chl-a, C and N uptake rate to ~4% of the highest values (0.6 mg m-3, 1.0 mg C m-3 h-1 , 0.1 mg N m-3 h-1, respectively) on January 12. The phytoplankton community was also replaced by neritic and ice-related species. These findings suggest that strong temporal shifts in phytoplankton C and N assimilation are strongly influenced by external forces (wind stress).
URI
https://repository.kopri.re.kr/handle/201206/13924
DOI
http://dx.doi.org/10.3389/fmars.2022.887909
Type
Article
Station
King Sejong Station
Indexed
SCIE
Appears in Collections  
2022-2022, Carbon cycle change and ecosystem response under the Southern Ocean warming (22-22) / Park, Jisoo (PE22110)
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