Size-differential photosynthetic traits of phytoplankton in the Chukchi Sea

Lee, Sang-Heon; Yun, Mi Sun; Jang, Hyo Keun; Kang, Jung Eun; Kim, Kwanwoo; Lee, Dabin; Jo, Naeun; Park, Sang Hoon; Lee, Jang Han; Ahn, So Hyun; Stockwell, Dean A.; Whitledge, Terry E.

doi:10.1016/j.csr.2023.104933

Cited by 5 publications

(3 citation statements)

References 56 publications

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“…The highest FM content was observed in the ES during winter, where riverine-organic matter inputs were expected to be low due to the absence of large rivers from the Korean and Japanese islands. While chlorophyll a concentration is conventionally used as an indicator of phytoplankton biomass, it can greatly vary (and therefore not correspond to the biomass) depending on the physiological conditions of phytoplankton [61][62][63]. In this study, the seasonal differences in chlorophyll a concentrations were considerably larger than those of FM across all four seas (Tables S1-S4), particularly in the ES where the difference in chlorophyll a concentrations between winter and spring exceeded those of FM (Table S4).…”

Section: Seasonal Variations In the Macromolecular Compositions Of Po...mentioning

confidence: 68%

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

Jang

Youn

Joo

et al. 2023

Water

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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.

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Section: Seasonal Variations In the Macromolecular Compositions Of Po...mentioning

confidence: 68%

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

Jang

Youn

Joo

et al. 2023

Water

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“…= 55.1 ± 22.6%), although there was interannual variation in the size compositions of chl- a ( Figure 6 ). Small phytoplankton generally contribute a substantial portion of the biomass and primary production of phytoplankton in the Arctic Ocean, except in polynyas and highly productive regions [ 46 , 50 , 51 ].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the validation and improvement of satellite-based estimations are necessary to accurately assess primary production in the Arctic Ocean. Intensive field measurements, combined with investigations of biogeochemical processes and ecosystem dynamics, will contribute to a better understanding of the impacts of environmental changes on marine microorganisms at both species and community levels in the KS, LS, and ESS, considering the influence of different phytoplankton communities on primary production and biogeochemical processes [ 51 ].…”

Section: Discussionmentioning

confidence: 99%

Primary Production in the Kara, Laptev, and East Siberian Seas

Kim

et al. 2023

Microorganisms

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Understanding of the primary production of phytoplankton in the Kara Sea (KS), the Laptev Sea (LS), and the East Siberian Sea (ESS) remains limited, despite the recognized importance of phytoplankton in the Arctic Ocean. To address this knowledge gap, we conducted three NABOS (Nansen and Amundsen Basins Observational System) expeditions in 2013, 2015, and 2018 to measure in situ primary production rates using a 13C-15N dual-tracer method and examine their major controlling factors. The main goals in this study were to investigate regional heterogeneity in primary production and derive its contemporary ranges in the KS, LS, and ESS. The daily primary production rates in this study (99 ± 62, 100 ± 77, and 56 ± 35 mg C m−2 d−1 in the KS, LS, and ESS, respectively) are rather different from the values previously reported in each sea mainly because of spatial and regional differences. Among the three seas, a significantly lower primary production rate was observed in the ESS in comparison to those in the KS and LS. This is likely mainly because of regional differences in freshwater content based on the noticeable relationship (Spearman, rs = −0.714, p < 0.05) between the freshwater content and the primary production rates observed in this study. The contemporary ranges of the annual primary production based on this and previous studies are 0.96–2.64, 0.72–50.52, and 1.68–16.68 g C m−2 in the KS, LS, and ESS, respectively. Further intensive field measurements are warranted to enhance our understanding of marine microorganisms and their community-level responses to the currently changing environmental conditions in these poorly studied regions of the Arctic Ocean.

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Long‐Term Variability of Phytoplankton Primary Production in the Ulleung Basin, East Sea/Japan Sea Using Ocean Color Remote Sensing

Lee,

Joo

et al. 2024

JGR Oceans

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In recent years, significant changes in environmental conditions and marine ecosystems have been observed in the East Sea/Japan Sea. This study investigates the long‐term environmental dynamics and phytoplankton responses in the Ulleung Basin, situated in the southwestern East Sea/Japan Sea, utilizing satellite and in situ data from 2002 to 2021. Over this period, there was a noticeable increase in sea surface temperature (SST) (r = 0.5739, p < 0.01), accompanied by decreasing mixed layer depth (MLD) and chlorophyll‐a (Chl‐a) concentration (r = −0.6193 and −0.6721, respectively; p < 0.01). Nutrient concentrations within the upper 50 m significantly declined for nitrate and phosphate. A reduction in the N:P ratio indicated a shift from phosphorus‐limited to nitrogen‐limited environment. Moreover, primary production (PP) demonstrated a decreasing trend (r = −0.5840, p < 0.01), coinciding with an increase in small phytoplankton contribution (r = 0.6399, p < 0.01). Rising SST potentially altered the water column's vertical structure, hindering nutrient entrainment from the deep ocean. Consequently, this nutrient limitation may increase small phytoplankton contribution, resulting in a decline in total PP. Under the IPCC's SSP5‐8.5 scenario, small phytoplankton contribution in the Ulleung Basin is projected to rise by over 10%, resulting in a 29% average PP decrease by 2100. This suggests a diminishing energy supply to the food web in a warming ocean, impacting higher trophic levels and major fishery resources. These findings emphasize the critical need for understanding and monitoring these environmental shifts for effective fisheries management and marine ecosystem conservation.

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Size-differential photosynthetic traits of phytoplankton in the Chukchi Sea

Cited by 5 publications

References 56 publications

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

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

Primary Production in the Kara, Laptev, and East Siberian Seas

Long‐Term Variability of Phytoplankton Primary Production in the Ulleung Basin, East Sea/Japan Sea Using Ocean Color Remote Sensing

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