First Estimation of the Annual Biosynthetic Calorie Production by Phytoplankton in the Yellow Sea, South Sea of Korea, East China Sea, and East Sea

Author:

Jang Hyo-Keun1,Youn Seok-Hyun2,Joo Huitae2,Kang Jae-Joong2,Lee Jae-Hyung3,Lee Dabin1,Jo Naeun4ORCID,Kim Yejin1ORCID,Kim Kwanwoo1,Kim Myung-Joon1,Park Sanghoon1ORCID,Kim Jaehong1,Kim Jaesoon1,Ahn So-Hyun5,Lee Sang-Heon1ORCID

Affiliation:

1. Department of Oceanography, Pusan National University, Busan 46241, Republic of Korea

2. Oceanic Climate and Ecology Research Division, National Institute of Fisheries Science, Busan 46083, Republic of Korea

3. South Sea Fisheries Research Institute, National Institute of Fisheries Science, Yeosu 59780, Republic of Korea

4. Department of Ecology and Conservation, Marine Biodiversity Institute of Korea, Seocheon 33662, Republic of Korea

5. Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD 21613, USA

Abstract

We investigated the spatio-temporal variations in three key biomolecular compounds (carbohydrates, proteins, and lipids) in particulate organic matter (POM) in the Yellow Sea (YS), South Sea of Korea (SS), East China Sea (ECS), and East Sea (Sea of Japan; ES) in order to estimate the regional annual calorie production rates based on the seasonal data obtained in each region. Carbohydrates were found to be most dominant, followed by lipids across all seas. The euphotic-integral calorie contents of POM during the study period were determined as 53.5 ± 12.6 Kcal m−2 in the YS; 54.2 ± 7.5 Kcal m−2 in the SS; 35.7 ± 9.2 Kcal m−2 in the ECS; and 58.7 ± 6.2 Kcal m−2 in the ES. Utilizing seasonal carbon conversion factors and primary production rates, we estimated the annual calorie productions, which were highest in the ES (1705 Kcal m−2 y−1) and lowest in the ECS (403 Kcal m−2 y−1). This can be attributed to the significantly higher energy efficiency of phytoplankton and faster turnover rate of calorie content. However, caution must be taken when comparing these estimates regionally, considering potential variations in developmental phases among the four regions during the sampling period in 2018. The calorie production rates in this study provide valuable insights into the physiological condition of phytoplankton within specific regions.

Funder

National Institute of Fisheries Science

Korea Institute of Marine Science & Technology

Publisher

MDPI AG

Subject

Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry

Reference77 articles.

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4. Finkel, Z.V., Follows, M.J., Liefer, J.D., Brown, C.M., Benner, I., and Irwin, A.J. (2016). Phylogenetic diversity in the macromolecular composition of microalgae. PLoS ONE, 11.

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