Seasonal carbon uptake rates of phytoplankton in the northern East/Japan Sea

Lee, Sang‐Heon; Joo, HuiTae; Lee, Jae Hyung; Lee, Jang Han; Kang, Jung Eun; Lee, Ho Won; Lee, Dabin; Kang, Chang Keun

doi:10.1016/j.dsr2.2017.04.009

Cited by 31 publications

(59 citation statements)

References 33 publications

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“…Based on the average daily carbon uptake rate in this study, the estimated annual primary production in the UB and NES was 284 g C m −2 y −1 and 147 g C m −2 y −1 , respectively. The annual production in both regions during our research period is consistent with previous studies in the UB (273 g C m −2 y −1 and 280 g C m −2 y −1 ) (Kwak et al, 2013;Joo et al, 2014) and in the northern EJS (159 g C m −2 y −1 ), including the NES regions (Lee et al, 2017b). The annual primary production in the UB (a deep basin with a water depth > 2,000 m) was markedly higher than that in oceanic regions and other basins deeper than 200 m, whereas the annual primary production in the NES was similar to that in these regions.…”

Section: Difference In the Carbon Uptake Rate Between The Ub And Nessupporting

confidence: 92%

“…Recently, the EJS, including the UB, has experienced notable changes in its physicochemical properties, such as drastic increases in sea surface temperature and rapid ocean acidification (Kim et al, 2001;Kang et al, 2003). These changes could accompany variations in biological characteristics, especially in phytoplankton communities and, subsequently, upper trophic levels (Chiba et al, 2012;Kang et al, 2017;Lee et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Different Size Phytoplankton for Primary Production and Biochemical Compositions in the Western East/Japan Sea

et al. 2020

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The current phytoplankton community structure is expected to change, with small phytoplankton becoming dominant under ongoing warming conditions. To understand and evaluate the ecological roles of small phytoplankton in terms of food quantity and quality, the carbon uptake rates and intracellular biochemical compositions (i.e., carbohydrates, CHO; proteins, PRT; and lipids, LIP) of phytoplankton of different sizes were analyzed and compared in two different regions of the western East/Japan Sea (EJS): the Ulleung Basin (UB) and northwestern East/Japan Sea (NES). The average carbon uptake rate by the whole phytoplankton community in the UB (79.0 ± 12.2 mg C m–2 h–1) was approximately two times higher than that in the NES (40.7 ± 2.2 mg C m–2 h–1), although the average chlorophyll a (chl a) concentration was similar between the UB (31.0 ± 8.4 mg chl a m–2) and NES (28.4 ± 7.9 mg chl a m–2). The main reasons for the large difference in the carbon uptake rates are believed to be water temperature, which affects metabolic activity and growth rate, and the difference in euphotic depths. The contributions of small phytoplankton to the total carbon uptake rate were not significantly different between the regions studied. However, the rate of decrease in the total carbon uptake with increasing contributions from small phytoplankton was substantially higher in the UB than in the NES. This result suggests that compared to other regions in the EJS, the primary production in the UB could decrease rapidly under ongoing climate change. The calorific contents calculated based on biochemical compositions were similar between the small (1.01 ± 0.33 Kcal m–3) and large (1.14 ± 0.36 Kcal m–3) phytoplankton in the UB, whereas the biochemical contents were higher in the large phytoplankton (1.88 ± 0.54 Kcal m–3) than in the small phytoplankton (1.06 ± 0.18 Kcal m–3) in the NES. The calorific values per unit of chl a were higher for the large phytoplankton than for the small phytoplankton in both regions, which suggests that large phytoplankton could provide a more energy efficient food source to organisms in higher trophic levels in the western EJS.

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Section: Difference In the Carbon Uptake Rate Between The Ub And Nessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Characteristics of Different Size Phytoplankton for Primary Production and Biochemical Compositions in the Western East/Japan Sea

et al. 2020

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“…This study suggested that large phytoplankton communities are the major contributors to primary production in the Ulleung Basin. Similarly, Legendre et al (1992) reported that primary production in the high-latitude Arctic region waters, in general, was dominated by large phytoplankton cells…”

Section: Small and Large Phytoplankton Contributionsmentioning

confidence: 85%

“…It has been reported that a reduction in SIC would facilitate photosynthetic activity and increase CO 2 intake by the seas (Anderson and Kaltin, 2001;Bates et al, 2006;Kahru et al, 2016). Apparently, it can cause a relative decline in the contribution by algae growing within the sea ice (Subba Rao and Platt, 1984;Legendre et al, 1992;Gosselin et al, 1997), although the sea ice community contributes less than 10 % to the total amount of Arctic Ocean C sequestration (Clasby et al, 1973;Horner and Schrader, 1982). A detailed study conducted on the interannual variations in SIC and primary production by Kahru et al (2016) suggested that primary production is enhanced with a decline in SIC.…”

Section: Sea Ice and Small Phytoplankton Primary Productionmentioning

confidence: 99%

First in situ estimations of small phytoplankton carbon and nitrogen uptake rates in the Kara, Laptev, and East Siberian seas

Bhavya

Lee

et al. 2018

Biogeosciences

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Abstract. Carbon and nitrogen uptake rates by small phytoplankton (0.7–5 µm) in the Kara, Laptev, and East Siberian seas in the Arctic Ocean were quantified using in situ isotope labeling experiments; this research, which was novel and part of the NABOS (Nansen and Amundsen Basins Observational System) program, took place from 21 August to 22 September 2013. The depth-integrated carbon (C), nitrate (NO3-), and ammonium (NH4+) uptake rates by small phytoplankton ranged from 0.54 to 15.96 mg C m−2 h−1, 0.05 to 1.02 mg C m−2 h−1, and 0.11 to 3.73 mg N m−2 h−1, respectively. The contributions of small phytoplankton towards the total C, NO3-, and NH4+ varied from 25 % to 89 %, 31 % to 89 %, and 28 % to 91 %, respectively. The turnover times for NO3- and NH4+ by small phytoplankton found in the present study indicate the longer residence times (years) of the nutrients in the deeper waters, particularly for NO3-. Additionally, the relatively higher C and N uptake rates by small phytoplankton obtained in the present study from locations with less sea ice concentration indicate the possibility that small phytoplankton thrive under the retreat of sea ice as a result of warming conditions. The high contributions of small phytoplankton to the total C and N uptake rates suggest the capability of small autotrophs to withstand the adverse hydrographic conditions introduced by climate change.

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“…Sampling and analysis of total chl-a and POC concentrations were conducted based on Lee et al [19]. Water samples for the total chl-a and POC concentrations of phytoplankton were collected from the surface layer using a rosette sampler with Niskin bottles.…”

Section: Study Area and Samplingmentioning

confidence: 99%

Estimation of the Particulate Organic Carbon to Chlorophyll-a Ratio Using MODIS-Aqua in the East/Japan Sea, South Korea

et al. 2020

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In recent years, the change of marine environment due to climate change and declining primary productivity have been big concerns in the East/Japan Sea, Korea. However, the main causes for the recent changes are still not revealed clearly. The particulate organic carbon (POC) to chlorophyll-a (chl-a) ratio (POC:chl-a) could be a useful indicator for ecological and physiological conditions of phytoplankton communities and thus help us to understand the recent reduction of primary productivity in the East/Japan Sea. To derive the POC in the East/Japan Sea from a satellite dataset, the new regional POC algorithm was empirically derived with in-situ measured POC concentrations. A strong positive linear relationship (R2 = 0.6579) was observed between the estimated and in-situ measured POC concentrations. Our new POC algorithm proved a better performance in the East/Japan Sea compared to the previous one for the global ocean. Based on the new algorithm, long-term POC:chl-a ratios were obtained in the entire East/Japan Sea from 2003 to 2018. The POC:chl-a showed a strong seasonal variability in the East/Japan Sea. The spring and fall blooms of phytoplankton mainly driven by the growth of large diatoms seem to be a major factor for the seasonal variability in the POC:chl-a. Our new regional POC algorithm modified for the East/Japan Sea could potentially contribute to long-term monitoring for the climate-associated ecosystem changes in the East/Japan Sea. Although the new regional POC algorithm shows a good correspondence with in-situ observed POC concentrations, the algorithm should be further improved with continuous field surveys.

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Seasonal carbon uptake rates of phytoplankton in the northern East/Japan Sea

Cited by 31 publications

References 33 publications

Characteristics of Different Size Phytoplankton for Primary Production and Biochemical Compositions in the Western East/Japan Sea

Characteristics of Different Size Phytoplankton for Primary Production and Biochemical Compositions in the Western East/Japan Sea

First in situ estimations of small phytoplankton carbon and nitrogen uptake rates in the Kara, Laptev, and East Siberian seas

Estimation of the Particulate Organic Carbon to Chlorophyll-a Ratio Using MODIS-Aqua in the East/Japan Sea, South Korea

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