Hihg contribution of small phytoplankton to the total primary production in the Yellow Sea during the summer period in 2016

Title
Hihg contribution of small phytoplankton to the total primary production in the Yellow Sea during the summer period in 2016
Author(s)
장효근; 김명준; 안소현; 정진용; 노재훈; 이상헌
KIOST Author(s)
Jeong, Jin Yong(정진용)Noh, Jae Hoon(노재훈)
Publication Year
2017-11-02
Abstract
Small phytoplankton contributing to the total primary production is getting important in relation to warming sea surface temperature since the marine food web structure as well as the primary production could be changed by increasing small phytoplankton. However, little information on the contribution of small phytoplankton is available in the Yellow Sea to date. Chlorophyll-a concentration and carbon and nitrogen uptakes were measured at 5 stations in the Yellow Sea in August 2016 to determine the contributions of small phytoplankton to total primary production. The daily total carbon uptake rate averaged from the 5 stations was 0.29 g C m-2 d-1 (S.D. = ± 0.17 g C m-2 d-1) in this study, which is approximately 60 % lower than that (0.47 ± 0.29 g C m-2 d- 1) measured in mid - eastern coast of the Yellow Sea during the similar period in 1989 - 1990. The daily total nitrogen uptake rate was 0.15 g N m-2 d-1 (S.D. = ± 0.07 g N m-2 d-1) in this study. The contributions of small phytoplankton to carbon and nitrogen of total phytoplankton were 71.9 % and 63.0 %, respectively, which are relatively higher than small phytoplankton contribution (53.1 %) to the total chlorophyll-a concentration (t-test, p < 0.05). Previous studies showed that the averaged contribution of phytoplankton (< 20 μm) to the total primary production is 55.4 ± 8.0 % which is significantly lower in this study (t-test, p < 0.05). A potential reason for the lower total primary production in this study is believed to the higher contribution of small phytoplankton, which is consistent with the results in the East/Japan Sea. Monitoring small phytoplankton contributions to the total primary production will be warrant for detecting changes in marine ecosystem under ongoing climate change.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23698
Bibliographic Citation
한국해양학회 추계학술발표대회, pp.268, 2017
Publisher
한국해양학회
Type
Conference
Language
Korean
Publisher
한국해양학회
Related Researcher
Research Interests

Variablility of ocean physical environment,해양물리환경변동

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